Google Git
Sign in
fuchsia / third_party / vim / refs/tags/v8.0.0074 / . / src / undo.c
blob: 57c3c2021d8d0577d22fe0d47ece248c8dfd63a3 [file] [log] [blame]
/* vi:set ts=8 sts=4 sw=4 noet:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* undo.c: multi level undo facility
*
* The saved lines are stored in a list of lists (one for each buffer):
*
* b_u_oldhead------------------------------------------------+
* |
* V
* +--------------+ +--------------+ +--------------+
* b_u_newhead--->| u_header | | u_header | | u_header |
* | uh_next------>| uh_next------>| uh_next---->NULL
* NULL<--------uh_prev |<---------uh_prev |<---------uh_prev |
* | uh_entry | | uh_entry | | uh_entry |
* +--------|-----+ +--------|-----+ +--------|-----+
* | | |
* V V V
* +--------------+ +--------------+ +--------------+
* | u_entry | | u_entry | | u_entry |
* | ue_next | | ue_next | | ue_next |
* +--------|-----+ +--------|-----+ +--------|-----+
* | | |
* V V V
* +--------------+ NULL NULL
* | u_entry |
* | ue_next |
* +--------|-----+
* |
* V
* etc.
*
* Each u_entry list contains the information for one undo or redo.
* curbuf->b_u_curhead points to the header of the last undo (the next redo),
* or is NULL if nothing has been undone (end of the branch).
*
* For keeping alternate undo/redo branches the uh_alt field is used. Thus at
* each point in the list a branch may appear for an alternate to redo. The
* uh_seq field is numbered sequentially to be able to find a newer or older
* branch.
*
* +---------------+ +---------------+
* b_u_oldhead --->| u_header | | u_header |
* | uh_alt_next ---->| uh_alt_next ----> NULL
* NULL <----- uh_alt_prev |<------ uh_alt_prev |
* | uh_prev | | uh_prev |
* +-----|---------+ +-----|---------+
* | |
* V V
* +---------------+ +---------------+
* | u_header | | u_header |
* | uh_alt_next | | uh_alt_next |
* b_u_newhead --->| uh_alt_prev | | uh_alt_prev |
* | uh_prev | | uh_prev |
* +-----|---------+ +-----|---------+
* | |
* V V
* NULL +---------------+ +---------------+
* | u_header | | u_header |
* | uh_alt_next ---->| uh_alt_next |
* | uh_alt_prev |<------ uh_alt_prev |
* | uh_prev | | uh_prev |
* +-----|---------+ +-----|---------+
* | |
* etc. etc.
*
*
* All data is allocated and will all be freed when the buffer is unloaded.
*/
/* Uncomment the next line for including the u_check() function. This warns
* for errors in the debug information. */
/* #define U_DEBUG 1 */
#define UH_MAGIC 0x18dade /* value for uh_magic when in use */
#define UE_MAGIC 0xabc123 /* value for ue_magic when in use */
/* Size of buffer used for encryption. */
#define CRYPT_BUF_SIZE 8192
#include "vim.h"
/* Structure passed around between functions.
* Avoids passing cryptstate_T when encryption not available. */
typedef struct {
buf_T *bi_buf;
FILE *bi_fp;
#ifdef FEAT_CRYPT
cryptstate_T *bi_state;
char_u *bi_buffer; /* CRYPT_BUF_SIZE, NULL when not buffering */
size_t bi_used; /* bytes written to/read from bi_buffer */
size_t bi_avail; /* bytes available in bi_buffer */
#endif
} bufinfo_T;
static long get_undolevel(void);
static void u_unch_branch(u_header_T *uhp);
static u_entry_T *u_get_headentry(void);
static void u_getbot(void);
static void u_doit(int count);
static void u_undoredo(int undo);
static void u_undo_end(int did_undo, int absolute);
static void u_add_time(char_u *buf, size_t buflen, time_t tt);
static void u_freeheader(buf_T *buf, u_header_T *uhp, u_header_T **uhpp);
static void u_freebranch(buf_T *buf, u_header_T *uhp, u_header_T **uhpp);
static void u_freeentries(buf_T *buf, u_header_T *uhp, u_header_T **uhpp);
static void u_freeentry(u_entry_T *, long);
#ifdef FEAT_PERSISTENT_UNDO
static void corruption_error(char *mesg, char_u *file_name);
static void u_free_uhp(u_header_T *uhp);
static int undo_write(bufinfo_T *bi, char_u *ptr, size_t len);
# ifdef FEAT_CRYPT
static int undo_flush(bufinfo_T *bi);
# endif
static int fwrite_crypt(bufinfo_T *bi, char_u *ptr, size_t len);
static int undo_write_bytes(bufinfo_T *bi, long_u nr, int len);
static void put_header_ptr(bufinfo_T *bi, u_header_T *uhp);
static int undo_read_4c(bufinfo_T *bi);
static int undo_read_2c(bufinfo_T *bi);
static int undo_read_byte(bufinfo_T *bi);
static time_t undo_read_time(bufinfo_T *bi);
static int undo_read(bufinfo_T *bi, char_u *buffer, size_t size);
static char_u *read_string_decrypt(bufinfo_T *bi, int len);
static int serialize_header(bufinfo_T *bi, char_u *hash);
static int serialize_uhp(bufinfo_T *bi, u_header_T *uhp);
static u_header_T *unserialize_uhp(bufinfo_T *bi, char_u *file_name);
static int serialize_uep(bufinfo_T *bi, u_entry_T *uep);
static u_entry_T *unserialize_uep(bufinfo_T *bi, int *error, char_u *file_name);
static void serialize_pos(bufinfo_T *bi, pos_T pos);
static void unserialize_pos(bufinfo_T *bi, pos_T *pos);
static void serialize_visualinfo(bufinfo_T *bi, visualinfo_T *info);
static void unserialize_visualinfo(bufinfo_T *bi, visualinfo_T *info);
#endif
#define U_ALLOC_LINE(size) lalloc((long_u)(size), FALSE)
static char_u *u_save_line(linenr_T);
/* used in undo_end() to report number of added and deleted lines */
static long u_newcount, u_oldcount;
/*
* When 'u' flag included in 'cpoptions', we behave like vi. Need to remember
* the action that "u" should do.
*/
static int undo_undoes = FALSE;
static int lastmark = 0;
#if defined(U_DEBUG) || defined(PROTO)
/*
* Check the undo structures for being valid. Print a warning when something
* looks wrong.
*/
static int seen_b_u_curhead;
static int seen_b_u_newhead;
static int header_count;
static void
u_check_tree(u_header_T *uhp,
u_header_T *exp_uh_next,
u_header_T *exp_uh_alt_prev)
{
u_entry_T *uep;
if (uhp == NULL)
return;
++header_count;
if (uhp == curbuf->b_u_curhead && ++seen_b_u_curhead > 1)
{
EMSG("b_u_curhead found twice (looping?)");
return;
}
if (uhp == curbuf->b_u_newhead && ++seen_b_u_newhead > 1)
{
EMSG("b_u_newhead found twice (looping?)");
return;
}
if (uhp->uh_magic != UH_MAGIC)
EMSG("uh_magic wrong (may be using freed memory)");
else
{
/* Check pointers back are correct. */
if (uhp->uh_next.ptr != exp_uh_next)
{
EMSG("uh_next wrong");
smsg((char_u *)"expected: 0x%x, actual: 0x%x",
exp_uh_next, uhp->uh_next.ptr);
}
if (uhp->uh_alt_prev.ptr != exp_uh_alt_prev)
{
EMSG("uh_alt_prev wrong");
smsg((char_u *)"expected: 0x%x, actual: 0x%x",
exp_uh_alt_prev, uhp->uh_alt_prev.ptr);
}
/* Check the undo tree at this header. */
for (uep = uhp->uh_entry; uep != NULL; uep = uep->ue_next)
{
if (uep->ue_magic != UE_MAGIC)
{
EMSG("ue_magic wrong (may be using freed memory)");
break;
}
}
/* Check the next alt tree. */
u_check_tree(uhp->uh_alt_next.ptr, uhp->uh_next.ptr, uhp);
/* Check the next header in this branch. */
u_check_tree(uhp->uh_prev.ptr, uhp, NULL);
}
}
static void
u_check(int newhead_may_be_NULL)
{
seen_b_u_newhead = 0;
seen_b_u_curhead = 0;
header_count = 0;
u_check_tree(curbuf->b_u_oldhead, NULL, NULL);
if (seen_b_u_newhead == 0 && curbuf->b_u_oldhead != NULL
&& !(newhead_may_be_NULL && curbuf->b_u_newhead == NULL))
EMSGN("b_u_newhead invalid: 0x%x", curbuf->b_u_newhead);
if (curbuf->b_u_curhead != NULL && seen_b_u_curhead == 0)
EMSGN("b_u_curhead invalid: 0x%x", curbuf->b_u_curhead);
if (header_count != curbuf->b_u_numhead)
{
EMSG("b_u_numhead invalid");
smsg((char_u *)"expected: %ld, actual: %ld",
(long)header_count, (long)curbuf->b_u_numhead);
}
}
#endif
/*
* Save the current line for both the "u" and "U" command.
* Careful: may trigger autocommands that reload the buffer.
* Returns OK or FAIL.
*/
int
u_save_cursor(void)
{
return (u_save((linenr_T)(curwin->w_cursor.lnum - 1),
(linenr_T)(curwin->w_cursor.lnum + 1)));
}
/*
* Save the lines between "top" and "bot" for both the "u" and "U" command.
* "top" may be 0 and bot may be curbuf->b_ml.ml_line_count + 1.
* Careful: may trigger autocommands that reload the buffer.
* Returns FAIL when lines could not be saved, OK otherwise.
*/
int
u_save(linenr_T top, linenr_T bot)
{
if (undo_off)
return OK;
if (top > curbuf->b_ml.ml_line_count
|| top >= bot
|| bot > curbuf->b_ml.ml_line_count + 1)
return FALSE; /* rely on caller to do error messages */
if (top + 2 == bot)
u_saveline((linenr_T)(top + 1));
return (u_savecommon(top, bot, (linenr_T)0, FALSE));
}
/*
* Save the line "lnum" (used by ":s" and "~" command).
* The line is replaced, so the new bottom line is lnum + 1.
* Careful: may trigger autocommands that reload the buffer.
* Returns FAIL when lines could not be saved, OK otherwise.
*/
int
u_savesub(linenr_T lnum)
{
if (undo_off)
return OK;
return (u_savecommon(lnum - 1, lnum + 1, lnum + 1, FALSE));
}
/*
* A new line is inserted before line "lnum" (used by :s command).
* The line is inserted, so the new bottom line is lnum + 1.
* Careful: may trigger autocommands that reload the buffer.
* Returns FAIL when lines could not be saved, OK otherwise.
*/
int
u_inssub(linenr_T lnum)
{
if (undo_off)
return OK;
return (u_savecommon(lnum - 1, lnum, lnum + 1, FALSE));
}
/*
* Save the lines "lnum" - "lnum" + nlines (used by delete command).
* The lines are deleted, so the new bottom line is lnum, unless the buffer
* becomes empty.
* Careful: may trigger autocommands that reload the buffer.
* Returns FAIL when lines could not be saved, OK otherwise.
*/
int
u_savedel(linenr_T lnum, long nlines)
{
if (undo_off)
return OK;
return (u_savecommon(lnum - 1, lnum + nlines,
nlines == curbuf->b_ml.ml_line_count ? 2 : lnum, FALSE));
}
/*
* Return TRUE when undo is allowed. Otherwise give an error message and
* return FALSE.
*/
int
undo_allowed(void)
{
/* Don't allow changes when 'modifiable' is off. */
if (!curbuf->b_p_ma)
{
EMSG(_(e_modifiable));
return FALSE;
}
#ifdef HAVE_SANDBOX
/* In the sandbox it's not allowed to change the text. */
if (sandbox != 0)
{
EMSG(_(e_sandbox));
return FALSE;
}
#endif
/* Don't allow changes in the buffer while editing the cmdline. The
* caller of getcmdline() may get confused. */
if (textlock != 0)
{
EMSG(_(e_secure));
return FALSE;
}
return TRUE;
}
/*
* Get the undolevle value for the current buffer.
*/
static long
get_undolevel(void)
{
if (curbuf->b_p_ul == NO_LOCAL_UNDOLEVEL)
return p_ul;
return curbuf->b_p_ul;
}
/*
* Common code for various ways to save text before a change.
* "top" is the line above the first changed line.
* "bot" is the line below the last changed line.
* "newbot" is the new bottom line. Use zero when not known.
* "reload" is TRUE when saving for a buffer reload.
* Careful: may trigger autocommands that reload the buffer.
* Returns FAIL when lines could not be saved, OK otherwise.
*/
int
u_savecommon(
linenr_T top,
linenr_T bot,
linenr_T newbot,
int reload)
{
linenr_T lnum;
long i;
u_header_T *uhp;
u_header_T *old_curhead;
u_entry_T *uep;
u_entry_T *prev_uep;
long size;
if (!reload)
{
/* When making changes is not allowed return FAIL. It's a crude way
* to make all change commands fail. */
if (!undo_allowed())
return FAIL;
#ifdef FEAT_NETBEANS_INTG
/*
* Netbeans defines areas that cannot be modified. Bail out here when
* trying to change text in a guarded area.
*/
if (netbeans_active())
{
if (netbeans_is_guarded(top, bot))
{
EMSG(_(e_guarded));
return FAIL;
}
if (curbuf->b_p_ro)
{
EMSG(_(e_nbreadonly));
return FAIL;
}
}
#endif
#ifdef FEAT_AUTOCMD
/*
* Saving text for undo means we are going to make a change. Give a
* warning for a read-only file before making the change, so that the
* FileChangedRO event can replace the buffer with a read-write version
* (e.g., obtained from a source control system).
*/
change_warning(0);
if (bot > curbuf->b_ml.ml_line_count + 1)
{
/* This happens when the FileChangedRO autocommand changes the
* file in a way it becomes shorter. */
EMSG(_("E881: Line count changed unexpectedly"));
return FAIL;
}
#endif
}
#ifdef U_DEBUG
u_check(FALSE);
#endif
size = bot - top - 1;
/*
* If curbuf->b_u_synced == TRUE make a new header.
*/
if (curbuf->b_u_synced)
{
#ifdef FEAT_JUMPLIST
/* Need to create new entry in b_changelist. */
curbuf->b_new_change = TRUE;
#endif
if (get_undolevel() >= 0)
{
/*
* Make a new header entry. Do this first so that we don't mess
* up the undo info when out of memory.
*/
uhp = (u_header_T *)U_ALLOC_LINE(sizeof(u_header_T));
if (uhp == NULL)
goto nomem;
#ifdef U_DEBUG
uhp->uh_magic = UH_MAGIC;
#endif
}
else
uhp = NULL;
/*
* If we undid more than we redid, move the entry lists before and
* including curbuf->b_u_curhead to an alternate branch.
*/
old_curhead = curbuf->b_u_curhead;
if (old_curhead != NULL)
{
curbuf->b_u_newhead = old_curhead->uh_next.ptr;
curbuf->b_u_curhead = NULL;
}
/*
* free headers to keep the size right
*/
while (curbuf->b_u_numhead > get_undolevel()
&& curbuf->b_u_oldhead != NULL)
{
u_header_T *uhfree = curbuf->b_u_oldhead;
if (uhfree == old_curhead)
/* Can't reconnect the branch, delete all of it. */
u_freebranch(curbuf, uhfree, &old_curhead);
else if (uhfree->uh_alt_next.ptr == NULL)
/* There is no branch, only free one header. */
u_freeheader(curbuf, uhfree, &old_curhead);
else
{
/* Free the oldest alternate branch as a whole. */
while (uhfree->uh_alt_next.ptr != NULL)
uhfree = uhfree->uh_alt_next.ptr;
u_freebranch(curbuf, uhfree, &old_curhead);
}
#ifdef U_DEBUG
u_check(TRUE);
#endif
}
if (uhp == NULL) /* no undo at all */
{
if (old_curhead != NULL)
u_freebranch(curbuf, old_curhead, NULL);
curbuf->b_u_synced = FALSE;
return OK;
}
uhp->uh_prev.ptr = NULL;
uhp->uh_next.ptr = curbuf->b_u_newhead;
uhp->uh_alt_next.ptr = old_curhead;
if (old_curhead != NULL)
{
uhp->uh_alt_prev.ptr = old_curhead->uh_alt_prev.ptr;
if (uhp->uh_alt_prev.ptr != NULL)
uhp->uh_alt_prev.ptr->uh_alt_next.ptr = uhp;
old_curhead->uh_alt_prev.ptr = uhp;
if (curbuf->b_u_oldhead == old_curhead)
curbuf->b_u_oldhead = uhp;
}
else
uhp->uh_alt_prev.ptr = NULL;
if (curbuf->b_u_newhead != NULL)
curbuf->b_u_newhead->uh_prev.ptr = uhp;
uhp->uh_seq = ++curbuf->b_u_seq_last;
curbuf->b_u_seq_cur = uhp->uh_seq;
uhp->uh_time = vim_time();
uhp->uh_save_nr = 0;
curbuf->b_u_time_cur = uhp->uh_time + 1;
uhp->uh_walk = 0;
uhp->uh_entry = NULL;
uhp->uh_getbot_entry = NULL;
uhp->uh_cursor = curwin->w_cursor; /* save cursor pos. for undo */
#ifdef FEAT_VIRTUALEDIT
if (virtual_active() && curwin->w_cursor.coladd > 0)
uhp->uh_cursor_vcol = getviscol();
else
uhp->uh_cursor_vcol = -1;
#endif
/* save changed and buffer empty flag for undo */
uhp->uh_flags = (curbuf->b_changed ? UH_CHANGED : 0) +
((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);
/* save named marks and Visual marks for undo */
mch_memmove(uhp->uh_namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);
uhp->uh_visual = curbuf->b_visual;
curbuf->b_u_newhead = uhp;
if (curbuf->b_u_oldhead == NULL)
curbuf->b_u_oldhead = uhp;
++curbuf->b_u_numhead;
}
else
{
if (get_undolevel() < 0) /* no undo at all */
return OK;
/*
* When saving a single line, and it has been saved just before, it
* doesn't make sense saving it again. Saves a lot of memory when
* making lots of changes inside the same line.
* This is only possible if the previous change didn't increase or
* decrease the number of lines.
* Check the ten last changes. More doesn't make sense and takes too
* long.
*/
if (size == 1)
{
uep = u_get_headentry();
prev_uep = NULL;
for (i = 0; i < 10; ++i)
{
if (uep == NULL)
break;
/* If lines have been inserted/deleted we give up.
* Also when the line was included in a multi-line save. */
if ((curbuf->b_u_newhead->uh_getbot_entry != uep
? (uep->ue_top + uep->ue_size + 1
!= (uep->ue_bot == 0
? curbuf->b_ml.ml_line_count + 1
: uep->ue_bot))
: uep->ue_lcount != curbuf->b_ml.ml_line_count)
|| (uep->ue_size > 1
&& top >= uep->ue_top
&& top + 2 <= uep->ue_top + uep->ue_size + 1))
break;
/* If it's the same line we can skip saving it again. */
if (uep->ue_size == 1 && uep->ue_top == top)
{
if (i > 0)
{
/* It's not the last entry: get ue_bot for the last
* entry now. Following deleted/inserted lines go to
* the re-used entry. */
u_getbot();
curbuf->b_u_synced = FALSE;
/* Move the found entry to become the last entry. The
* order of undo/redo doesn't matter for the entries
* we move it over, since they don't change the line
* count and don't include this line. It does matter
* for the found entry if the line count is changed by
* the executed command. */
prev_uep->ue_next = uep->ue_next;
uep->ue_next = curbuf->b_u_newhead->uh_entry;
curbuf->b_u_newhead->uh_entry = uep;
}
/* The executed command may change the line count. */
if (newbot != 0)
uep->ue_bot = newbot;
else if (bot > curbuf->b_ml.ml_line_count)
uep->ue_bot = 0;
else
{
uep->ue_lcount = curbuf->b_ml.ml_line_count;
curbuf->b_u_newhead->uh_getbot_entry = uep;
}
return OK;
}
prev_uep = uep;
uep = uep->ue_next;
}
}
/* find line number for ue_bot for previous u_save() */
u_getbot();
}
#if !defined(UNIX) && !defined(WIN32)
/*
* With Amiga we can't handle big undo's, because
* then u_alloc_line would have to allocate a block larger than 32K
*/
if (size >= 8000)
goto nomem;
#endif
/*
* add lines in front of entry list
*/
uep = (u_entry_T *)U_ALLOC_LINE(sizeof(u_entry_T));
if (uep == NULL)
goto nomem;
vim_memset(uep, 0, sizeof(u_entry_T));
#ifdef U_DEBUG
uep->ue_magic = UE_MAGIC;
#endif
uep->ue_size = size;
uep->ue_top = top;
if (newbot != 0)
uep->ue_bot = newbot;
/*
* Use 0 for ue_bot if bot is below last line.
* Otherwise we have to compute ue_bot later.
*/
else if (bot > curbuf->b_ml.ml_line_count)
uep->ue_bot = 0;
else
{
uep->ue_lcount = curbuf->b_ml.ml_line_count;
curbuf->b_u_newhead->uh_getbot_entry = uep;
}
if (size > 0)
{
if ((uep->ue_array = (char_u **)U_ALLOC_LINE(
sizeof(char_u *) * size)) == NULL)
{
u_freeentry(uep, 0L);
goto nomem;
}
for (i = 0, lnum = top + 1; i < size; ++i)
{
fast_breakcheck();
if (got_int)
{
u_freeentry(uep, i);
return FAIL;
}
if ((uep->ue_array[i] = u_save_line(lnum++)) == NULL)
{
u_freeentry(uep, i);
goto nomem;
}
}
}
else
uep->ue_array = NULL;
uep->ue_next = curbuf->b_u_newhead->uh_entry;
curbuf->b_u_newhead->uh_entry = uep;
curbuf->b_u_synced = FALSE;
undo_undoes = FALSE;
#ifdef U_DEBUG
u_check(FALSE);
#endif
return OK;
nomem:
msg_silent = 0; /* must display the prompt */
if (ask_yesno((char_u *)_("No undo possible; continue anyway"), TRUE)
== 'y')
{
undo_off = TRUE; /* will be reset when character typed */
return OK;
}
do_outofmem_msg((long_u)0);
return FAIL;
}
#if defined(FEAT_PERSISTENT_UNDO) || defined(PROTO)
# define UF_START_MAGIC "Vim\237UnDo\345" /* magic at start of undofile */
# define UF_START_MAGIC_LEN 9
# define UF_HEADER_MAGIC 0x5fd0 /* magic at start of header */
# define UF_HEADER_END_MAGIC 0xe7aa /* magic after last header */
# define UF_ENTRY_MAGIC 0xf518 /* magic at start of entry */
# define UF_ENTRY_END_MAGIC 0x3581 /* magic after last entry */
# define UF_VERSION 2 /* 2-byte undofile version number */
# define UF_VERSION_CRYPT 0x8002 /* idem, encrypted */
/* extra fields for header */
# define UF_LAST_SAVE_NR 1
/* extra fields for uhp */
# define UHP_SAVE_NR 1
static char_u e_not_open[] = N_("E828: Cannot open undo file for writing: %s");
/*
* Compute the hash for the current buffer text into hash[UNDO_HASH_SIZE].
*/
void
u_compute_hash(char_u *hash)
{
context_sha256_T ctx;
linenr_T lnum;
char_u *p;
sha256_start(&ctx);
for (lnum = 1; lnum <= curbuf->b_ml.ml_line_count; ++lnum)
{
p = ml_get(lnum);
sha256_update(&ctx, p, (UINT32_T)(STRLEN(p) + 1));
}
sha256_finish(&ctx, hash);
}
/*
* Return an allocated string of the full path of the target undofile.
* When "reading" is TRUE find the file to read, go over all directories in
* 'undodir'.
* When "reading" is FALSE use the first name where the directory exists.
* Returns NULL when there is no place to write or no file to read.
*/
char_u *
u_get_undo_file_name(char_u *buf_ffname, int reading)
{
char_u *dirp;
char_u dir_name[IOSIZE + 1];
char_u *munged_name = NULL;
char_u *undo_file_name = NULL;
int dir_len;
char_u *p;
stat_T st;
char_u *ffname = buf_ffname;
#ifdef HAVE_READLINK
char_u fname_buf[MAXPATHL];
#endif
if (ffname == NULL)
return NULL;
#ifdef HAVE_READLINK
/* Expand symlink in the file name, so that we put the undo file with the
* actual file instead of with the symlink. */
if (resolve_symlink(ffname, fname_buf) == OK)
ffname = fname_buf;
#endif
/* Loop over 'undodir'. When reading find the first file that exists.
* When not reading use the first directory that exists or ".". */
dirp = p_udir;
while (*dirp != NUL)
{
dir_len = copy_option_part(&dirp, dir_name, IOSIZE, ",");
if (dir_len == 1 && dir_name[0] == '.')
{
/* Use same directory as the ffname,
* "dir/name" -> "dir/.name.un~" */
undo_file_name = vim_strnsave(ffname, (int)(STRLEN(ffname) + 5));
if (undo_file_name == NULL)
break;
p = gettail(undo_file_name);
#ifdef VMS
/* VMS can not handle more than one dot in the filenames
* use "dir/name" -> "dir/_un_name" - add _un_
* at the beginning to keep the extension */
mch_memmove(p + 4, p, STRLEN(p) + 1);
mch_memmove(p, "_un_", 4);
#else
/* Use same directory as the ffname,
* "dir/name" -> "dir/.name.un~" */
mch_memmove(p + 1, p, STRLEN(p) + 1);
*p = '.';
STRCAT(p, ".un~");
#endif
}
else
{
dir_name[dir_len] = NUL;
if (mch_isdir(dir_name))
{
if (munged_name == NULL)
{
munged_name = vim_strsave(ffname);
if (munged_name == NULL)
return NULL;
for (p = munged_name; *p != NUL; mb_ptr_adv(p))
if (vim_ispathsep(*p))
*p = '%';
}
undo_file_name = concat_fnames(dir_name, munged_name, TRUE);
}
}
/* When reading check if the file exists. */
if (undo_file_name != NULL && (!reading
|| mch_stat((char *)undo_file_name, &st) >= 0))
break;
vim_free(undo_file_name);
undo_file_name = NULL;
}
vim_free(munged_name);
return undo_file_name;
}
static void
corruption_error(char *mesg, char_u *file_name)
{
EMSG3(_("E825: Corrupted undo file (%s): %s"), mesg, file_name);
}
static void
u_free_uhp(u_header_T *uhp)
{
u_entry_T *nuep;
u_entry_T *uep;
uep = uhp->uh_entry;
while (uep != NULL)
{
nuep = uep->ue_next;
u_freeentry(uep, uep->ue_size);
uep = nuep;
}
vim_free(uhp);
}
/*
* Write a sequence of bytes to the undo file.
* Buffers and encrypts as needed.
* Returns OK or FAIL.
*/
static int
undo_write(bufinfo_T *bi, char_u *ptr, size_t len)
{
#ifdef FEAT_CRYPT
if (bi->bi_buffer != NULL)
{
size_t len_todo = len;
char_u *p = ptr;
while (bi->bi_used + len_todo >= CRYPT_BUF_SIZE)
{
size_t n = CRYPT_BUF_SIZE - bi->bi_used;
mch_memmove(bi->bi_buffer + bi->bi_used, p, n);
len_todo -= n;
p += n;
bi->bi_used = CRYPT_BUF_SIZE;
if (undo_flush(bi) == FAIL)
return FAIL;
}
if (len_todo > 0)
{
mch_memmove(bi->bi_buffer + bi->bi_used, p, len_todo);
bi->bi_used += len_todo;
}
return OK;
}
#endif
if (fwrite(ptr, len, (size_t)1, bi->bi_fp) != 1)
return FAIL;
return OK;
}
#ifdef FEAT_CRYPT
static int
undo_flush(bufinfo_T *bi)
{
if (bi->bi_buffer != NULL && bi->bi_used > 0)
{
crypt_encode_inplace(bi->bi_state, bi->bi_buffer, bi->bi_used);
if (fwrite(bi->bi_buffer, bi->bi_used, (size_t)1, bi->bi_fp) != 1)
return FAIL;
bi->bi_used = 0;
}
return OK;
}
#endif
/*
* Write "ptr[len]" and crypt the bytes when needed.
* Returns OK or FAIL.
*/
static int
fwrite_crypt(bufinfo_T *bi, char_u *ptr, size_t len)
{
#ifdef FEAT_CRYPT
char_u *copy;
char_u small_buf[100];
size_t i;
if (bi->bi_state != NULL && bi->bi_buffer == NULL)
{
/* crypting every piece of text separately */
if (len < 100)
copy = small_buf; /* no malloc()/free() for short strings */
else
{
copy = lalloc(len, FALSE);
if (copy == NULL)
return 0;
}
crypt_encode(bi->bi_state, ptr, len, copy);
i = fwrite(copy, len, (size_t)1, bi->bi_fp);
if (copy != small_buf)
vim_free(copy);
return i == 1 ? OK : FAIL;
}
#endif
return undo_write(bi, ptr, len);
}
/*
* Write a number, MSB first, in "len" bytes.
* Must match with undo_read_?c() functions.
* Returns OK or FAIL.
*/
static int
undo_write_bytes(bufinfo_T *bi, long_u nr, int len)
{
char_u buf[8];
int i;
int bufi = 0;
for (i = len - 1; i >= 0; --i)
buf[bufi++] = (char_u)(nr >> (i * 8));
return undo_write(bi, buf, (size_t)len);
}
/*
* Write the pointer to an undo header. Instead of writing the pointer itself
* we use the sequence number of the header. This is converted back to
* pointers when reading. */
static void
put_header_ptr(bufinfo_T *bi, u_header_T *uhp)
{
undo_write_bytes(bi, (long_u)(uhp != NULL ? uhp->uh_seq : 0), 4);
}
static int
undo_read_4c(bufinfo_T *bi)
{
#ifdef FEAT_CRYPT
if (bi->bi_buffer != NULL)
{
char_u buf[4];
int n;
undo_read(bi, buf, (size_t)4);
n = ((unsigned)buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + buf[3];
return n;
}
#endif
return get4c(bi->bi_fp);
}
static int
undo_read_2c(bufinfo_T *bi)
{
#ifdef FEAT_CRYPT
if (bi->bi_buffer != NULL)
{
char_u buf[2];
int n;
undo_read(bi, buf, (size_t)2);
n = (buf[0] << 8) + buf[1];
return n;
}
#endif
return get2c(bi->bi_fp);
}
static int
undo_read_byte(bufinfo_T *bi)
{
#ifdef FEAT_CRYPT
if (bi->bi_buffer != NULL)
{
char_u buf[1];
undo_read(bi, buf, (size_t)1);
return buf[0];
}
#endif
return getc(bi->bi_fp);
}
static time_t
undo_read_time(bufinfo_T *bi)
{
#ifdef FEAT_CRYPT
if (bi->bi_buffer != NULL)
{
char_u buf[8];
time_t n = 0;
int i;
undo_read(bi, buf, (size_t)8);
for (i = 0; i < 8; ++i)
n = (n << 8) + buf[i];
return n;
}
#endif
return get8ctime(bi->bi_fp);
}
/*
* Read "buffer[size]" from the undo file.
* Return OK or FAIL.
*/
static int
undo_read(bufinfo_T *bi, char_u *buffer, size_t size)
{
#ifdef FEAT_CRYPT
if (bi->bi_buffer != NULL)
{
int size_todo = (int)size;
char_u *p = buffer;
while (size_todo > 0)
{
size_t n;
if (bi->bi_used >= bi->bi_avail)
{
n = fread(bi->bi_buffer, 1, (size_t)CRYPT_BUF_SIZE, bi->bi_fp);
if (n == 0)
{
/* Error may be checked for only later. Fill with zeros,
* so that the reader won't use garbage. */
vim_memset(p, 0, size_todo);
return FAIL;
}
bi->bi_avail = n;
bi->bi_used = 0;
crypt_decode_inplace(bi->bi_state, bi->bi_buffer, bi->bi_avail);
}
n = size_todo;
if (n > bi->bi_avail - bi->bi_used)
n = bi->bi_avail - bi->bi_used;
mch_memmove(p, bi->bi_buffer + bi->bi_used, n);
bi->bi_used += n;
size_todo -= (int)n;
p += n;
}
return OK;
}
#endif
if (fread(buffer, (size_t)size, 1, bi->bi_fp) != 1)
return FAIL;
return OK;
}
/*
* Read a string of length "len" from "bi->bi_fd".
* "len" can be zero to allocate an empty line.
* Decrypt the bytes if needed.
* Append a NUL.
* Returns a pointer to allocated memory or NULL for failure.
*/
static char_u *
read_string_decrypt(bufinfo_T *bi, int len)
{
char_u *ptr = alloc((unsigned)len + 1);
if (ptr != NULL)
{
if (len > 0 && undo_read(bi, ptr, len) == FAIL)
{
vim_free(ptr);
return NULL;
}
ptr[len] = NUL;
#ifdef FEAT_CRYPT
if (bi->bi_state != NULL && bi->bi_buffer == NULL)
crypt_decode_inplace(bi->bi_state, ptr, len);
#endif
}
return ptr;
}
/*
* Writes the (not encrypted) header and initializes encryption if needed.
*/
static int
serialize_header(bufinfo_T *bi, char_u *hash)
{
int len;
buf_T *buf = bi->bi_buf;
FILE *fp = bi->bi_fp;
char_u time_buf[8];
/* Start writing, first the magic marker and undo info version. */
if (fwrite(UF_START_MAGIC, (size_t)UF_START_MAGIC_LEN, (size_t)1, fp) != 1)
return FAIL;
/* If the buffer is encrypted then all text bytes following will be
* encrypted. Numbers and other info is not crypted. */
#ifdef FEAT_CRYPT
if (*buf->b_p_key != NUL)
{
char_u *header;
int header_len;
undo_write_bytes(bi, (long_u)UF_VERSION_CRYPT, 2);
bi->bi_state = crypt_create_for_writing(crypt_get_method_nr(buf),
buf->b_p_key, &header, &header_len);
if (bi->bi_state == NULL)
return FAIL;
len = (int)fwrite(header, (size_t)header_len, (size_t)1, fp);
vim_free(header);
if (len != 1)
{
crypt_free_state(bi->bi_state);
bi->bi_state = NULL;
return FAIL;
}
if (crypt_whole_undofile(crypt_get_method_nr(buf)))
{
bi->bi_buffer = alloc(CRYPT_BUF_SIZE);
if (bi->bi_buffer == NULL)
{
crypt_free_state(bi->bi_state);
bi->bi_state = NULL;
return FAIL;
}
bi->bi_used = 0;
}
}
else
#endif
undo_write_bytes(bi, (long_u)UF_VERSION, 2);
/* Write a hash of the buffer text, so that we can verify it is still the
* same when reading the buffer text. */
if (undo_write(bi, hash, (size_t)UNDO_HASH_SIZE) == FAIL)
return FAIL;
/* buffer-specific data */
undo_write_bytes(bi, (long_u)buf->b_ml.ml_line_count, 4);
len = buf->b_u_line_ptr != NULL ? (int)STRLEN(buf->b_u_line_ptr) : 0;
undo_write_bytes(bi, (long_u)len, 4);
if (len > 0 && fwrite_crypt(bi, buf->b_u_line_ptr, (size_t)len) == FAIL)
return FAIL;
undo_write_bytes(bi, (long_u)buf->b_u_line_lnum, 4);
undo_write_bytes(bi, (long_u)buf->b_u_line_colnr, 4);
/* Undo structures header data */
put_header_ptr(bi, buf->b_u_oldhead);
put_header_ptr(bi, buf->b_u_newhead);
put_header_ptr(bi, buf->b_u_curhead);
undo_write_bytes(bi, (long_u)buf->b_u_numhead, 4);
undo_write_bytes(bi, (long_u)buf->b_u_seq_last, 4);
undo_write_bytes(bi, (long_u)buf->b_u_seq_cur, 4);
time_to_bytes(buf->b_u_time_cur, time_buf);
undo_write(bi, time_buf, 8);
/* Optional fields. */
undo_write_bytes(bi, 4, 1);
undo_write_bytes(bi, UF_LAST_SAVE_NR, 1);
undo_write_bytes(bi, (long_u)buf->b_u_save_nr_last, 4);
undo_write_bytes(bi, 0, 1); /* end marker */
return OK;
}
static int
serialize_uhp(bufinfo_T *bi, u_header_T *uhp)
{
int i;
u_entry_T *uep;
char_u time_buf[8];
if (undo_write_bytes(bi, (long_u)UF_HEADER_MAGIC, 2) == FAIL)
return FAIL;
put_header_ptr(bi, uhp->uh_next.ptr);
put_header_ptr(bi, uhp->uh_prev.ptr);
put_header_ptr(bi, uhp->uh_alt_next.ptr);
put_header_ptr(bi, uhp->uh_alt_prev.ptr);
undo_write_bytes(bi, uhp->uh_seq, 4);
serialize_pos(bi, uhp->uh_cursor);
#ifdef FEAT_VIRTUALEDIT
undo_write_bytes(bi, (long_u)uhp->uh_cursor_vcol, 4);
#else
undo_write_bytes(bi, (long_u)0, 4);
#endif
undo_write_bytes(bi, (long_u)uhp->uh_flags, 2);
/* Assume NMARKS will stay the same. */
for (i = 0; i < NMARKS; ++i)
serialize_pos(bi, uhp->uh_namedm[i]);
serialize_visualinfo(bi, &uhp->uh_visual);
time_to_bytes(uhp->uh_time, time_buf);
undo_write(bi, time_buf, 8);
/* Optional fields. */
undo_write_bytes(bi, 4, 1);
undo_write_bytes(bi, UHP_SAVE_NR, 1);
undo_write_bytes(bi, (long_u)uhp->uh_save_nr, 4);
undo_write_bytes(bi, 0, 1); /* end marker */
/* Write all the entries. */
for (uep = uhp->uh_entry; uep != NULL; uep = uep->ue_next)
{
undo_write_bytes(bi, (long_u)UF_ENTRY_MAGIC, 2);
if (serialize_uep(bi, uep) == FAIL)
return FAIL;
}
undo_write_bytes(bi, (long_u)UF_ENTRY_END_MAGIC, 2);
return OK;
}
static u_header_T *
unserialize_uhp(bufinfo_T *bi, char_u *file_name)
{
u_header_T *uhp;
int i;
u_entry_T *uep, *last_uep;
int c;
int error;
uhp = (u_header_T *)U_ALLOC_LINE(sizeof(u_header_T));
if (uhp == NULL)
return NULL;
vim_memset(uhp, 0, sizeof(u_header_T));
#ifdef U_DEBUG
uhp->uh_magic = UH_MAGIC;
#endif
uhp->uh_next.seq = undo_read_4c(bi);
uhp->uh_prev.seq = undo_read_4c(bi);
uhp->uh_alt_next.seq = undo_read_4c(bi);
uhp->uh_alt_prev.seq = undo_read_4c(bi);
uhp->uh_seq = undo_read_4c(bi);
if (uhp->uh_seq <= 0)
{
corruption_error("uh_seq", file_name);
vim_free(uhp);
return NULL;
}
unserialize_pos(bi, &uhp->uh_cursor);
#ifdef FEAT_VIRTUALEDIT
uhp->uh_cursor_vcol = undo_read_4c(bi);
#else
(void)undo_read_4c(bi);
#endif
uhp->uh_flags = undo_read_2c(bi);
for (i = 0; i < NMARKS; ++i)
unserialize_pos(bi, &uhp->uh_namedm[i]);
unserialize_visualinfo(bi, &uhp->uh_visual);
uhp->uh_time = undo_read_time(bi);
/* Optional fields. */
for (;;)
{
int len = undo_read_byte(bi);
int what;
if (len == 0)
break;
what = undo_read_byte(bi);
switch (what)
{
case UHP_SAVE_NR:
uhp->uh_save_nr = undo_read_4c(bi);
break;
default:
/* field not supported, skip */
while (--len >= 0)
(void)undo_read_byte(bi);
}
}
/* Unserialize the uep list. */
last_uep = NULL;
while ((c = undo_read_2c(bi)) == UF_ENTRY_MAGIC)
{
error = FALSE;
uep = unserialize_uep(bi, &error, file_name);
if (last_uep == NULL)
uhp->uh_entry = uep;
else
last_uep->ue_next = uep;
last_uep = uep;
if (uep == NULL || error)
{
u_free_uhp(uhp);
return NULL;
}
}
if (c != UF_ENTRY_END_MAGIC)
{
corruption_error("entry end", file_name);
u_free_uhp(uhp);
return NULL;
}
return uhp;
}
/*
* Serialize "uep".
*/
static int
serialize_uep(
bufinfo_T *bi,
u_entry_T *uep)
{
int i;
size_t len;
undo_write_bytes(bi, (long_u)uep->ue_top, 4);
undo_write_bytes(bi, (long_u)uep->ue_bot, 4);
undo_write_bytes(bi, (long_u)uep->ue_lcount, 4);
undo_write_bytes(bi, (long_u)uep->ue_size, 4);
for (i = 0; i < uep->ue_size; ++i)
{
len = STRLEN(uep->ue_array[i]);
if (undo_write_bytes(bi, (long_u)len, 4) == FAIL)
return FAIL;
if (len > 0 && fwrite_crypt(bi, uep->ue_array[i], len) == FAIL)
return FAIL;
}
return OK;
}
static u_entry_T *
unserialize_uep(bufinfo_T *bi, int *error, char_u *file_name)
{
int i;
u_entry_T *uep;
char_u **array;
char_u *line;
int line_len;
uep = (u_entry_T *)U_ALLOC_LINE(sizeof(u_entry_T));
if (uep == NULL)
return NULL;
vim_memset(uep, 0, sizeof(u_entry_T));
#ifdef U_DEBUG
uep->ue_magic = UE_MAGIC;
#endif
uep->ue_top = undo_read_4c(bi);
uep->ue_bot = undo_read_4c(bi);
uep->ue_lcount = undo_read_4c(bi);
uep->ue_size = undo_read_4c(bi);
if (uep->ue_size > 0)
{
array = (char_u **)U_ALLOC_LINE(sizeof(char_u *) * uep->ue_size);
if (array == NULL)
{
*error = TRUE;
return uep;
}
vim_memset(array, 0, sizeof(char_u *) * uep->ue_size);
}
else
array = NULL;
uep->ue_array = array;
for (i = 0; i < uep->ue_size; ++i)
{
line_len = undo_read_4c(bi);
if (line_len >= 0)
line = read_string_decrypt(bi, line_len);
else
{
line = NULL;
corruption_error("line length", file_name);
}
if (line == NULL)
{
*error = TRUE;
return uep;
}
array[i] = line;
}
return uep;
}
/*
* Serialize "pos".
*/
static void
serialize_pos(bufinfo_T *bi, pos_T pos)
{
undo_write_bytes(bi, (long_u)pos.lnum, 4);
undo_write_bytes(bi, (long_u)pos.col, 4);
#ifdef FEAT_VIRTUALEDIT
undo_write_bytes(bi, (long_u)pos.coladd, 4);
#else
undo_write_bytes(bi, (long_u)0, 4);
#endif
}
/*
* Unserialize the pos_T at the current position.
*/
static void
unserialize_pos(bufinfo_T *bi, pos_T *pos)
{
pos->lnum = undo_read_4c(bi);
if (pos->lnum < 0)
pos->lnum = 0;
pos->col = undo_read_4c(bi);
if (pos->col < 0)
pos->col = 0;
#ifdef FEAT_VIRTUALEDIT
pos->coladd = undo_read_4c(bi);
if (pos->coladd < 0)
pos->coladd = 0;
#else
(void)undo_read_4c(bi);
#endif
}
/*
* Serialize "info".
*/
static void
serialize_visualinfo(bufinfo_T *bi, visualinfo_T *info)
{
serialize_pos(bi, info->vi_start);
serialize_pos(bi, info->vi_end);
undo_write_bytes(bi, (long_u)info->vi_mode, 4);
undo_write_bytes(bi, (long_u)info->vi_curswant, 4);
}
/*
* Unserialize the visualinfo_T at the current position.
*/
static void
unserialize_visualinfo(bufinfo_T *bi, visualinfo_T *info)
{
unserialize_pos(bi, &info->vi_start);
unserialize_pos(bi, &info->vi_end);
info->vi_mode = undo_read_4c(bi);
info->vi_curswant = undo_read_4c(bi);
}
/*
* Write the undo tree in an undo file.
* When "name" is not NULL, use it as the name of the undo file.
* Otherwise use buf->b_ffname to generate the undo file name.
* "buf" must never be null, buf->b_ffname is used to obtain the original file
* permissions.
* "forceit" is TRUE for ":wundo!", FALSE otherwise.
* "hash[UNDO_HASH_SIZE]" must be the hash value of the buffer text.
*/
void
u_write_undo(
char_u *name,
int forceit,
buf_T *buf,
char_u *hash)
{
u_header_T *uhp;
char_u *file_name;
int mark;
#ifdef U_DEBUG
int headers_written = 0;
#endif
int fd;
FILE *fp = NULL;
int perm;
int write_ok = FALSE;
#ifdef UNIX
int st_old_valid = FALSE;
stat_T st_old;
stat_T st_new;
#endif
bufinfo_T bi;
vim_memset(&bi, 0, sizeof(bi));
if (name == NULL)
{
file_name = u_get_undo_file_name(buf->b_ffname, FALSE);
if (file_name == NULL)
{
if (p_verbose > 0)
{
verbose_enter();
smsg((char_u *)
_("Cannot write undo file in any directory in 'undodir'"));
verbose_leave();
}
return;
}
}
else
file_name = name;
/*
* Decide about the permission to use for the undo file. If the buffer
* has a name use the permission of the original file. Otherwise only
* allow the user to access the undo file.
*/
perm = 0600;
if (buf->b_ffname != NULL)
{
#ifdef UNIX
if (mch_stat((char *)buf->b_ffname, &st_old) >= 0)
{
perm = st_old.st_mode;
st_old_valid = TRUE;
}
#else
perm = mch_getperm(buf->b_ffname);
if (perm < 0)
perm = 0600;
#endif
}
/* strip any s-bit and executable bit */
perm = perm & 0666;
/* If the undo file already exists, verify that it actually is an undo
* file, and delete it. */
if (mch_getperm(file_name) >= 0)
{
if (name == NULL || !forceit)
{
/* Check we can read it and it's an undo file. */
fd = mch_open((char *)file_name, O_RDONLY|O_EXTRA, 0);
if (fd < 0)
{
if (name != NULL || p_verbose > 0)
{
if (name == NULL)
verbose_enter();
smsg((char_u *)
_("Will not overwrite with undo file, cannot read: %s"),
file_name);
if (name == NULL)
verbose_leave();
}
goto theend;
}
else
{
char_u mbuf[UF_START_MAGIC_LEN];
int len;
len = read_eintr(fd, mbuf, UF_START_MAGIC_LEN);
close(fd);
if (len < UF_START_MAGIC_LEN
|| memcmp(mbuf, UF_START_MAGIC, UF_START_MAGIC_LEN) != 0)
{
if (name != NULL || p_verbose > 0)
{
if (name == NULL)
verbose_enter();
smsg((char_u *)
_("Will not overwrite, this is not an undo file: %s"),
file_name);
if (name == NULL)
verbose_leave();
}
goto theend;
}
}
}
mch_remove(file_name);
}
/* If there is no undo information at all, quit here after deleting any
* existing undo file. */
if (buf->b_u_numhead == 0 && buf->b_u_line_ptr == NULL)
{
if (p_verbose > 0)
verb_msg((char_u *)_("Skipping undo file write, nothing to undo"));
goto theend;
}
fd = mch_open((char *)file_name,
O_CREAT|O_EXTRA|O_WRONLY|O_EXCL|O_NOFOLLOW, perm);
if (fd < 0)
{
EMSG2(_(e_not_open), file_name);
goto theend;
}
(void)mch_setperm(file_name, perm);
if (p_verbose > 0)
{
verbose_enter();
smsg((char_u *)_("Writing undo file: %s"), file_name);
verbose_leave();
}
#ifdef U_DEBUG
/* Check there is no problem in undo info before writing. */
u_check(FALSE);
#endif
#ifdef UNIX
/*
* Try to set the group of the undo file same as the original file. If
* this fails, set the protection bits for the group same as the
* protection bits for others.
*/
if (st_old_valid
&& mch_stat((char *)file_name, &st_new) >= 0
&& st_new.st_gid != st_old.st_gid
# ifdef HAVE_FCHOWN /* sequent-ptx lacks fchown() */
&& fchown(fd, (uid_t)-1, st_old.st_gid) != 0
# endif
)
mch_setperm(file_name, (perm & 0707) | ((perm & 07) << 3));
# if defined(HAVE_SELINUX) || defined(HAVE_SMACK)
if (buf->b_ffname != NULL)
mch_copy_sec(buf->b_ffname, file_name);
# endif
#endif
fp = fdopen(fd, "w");
if (fp == NULL)
{
EMSG2(_(e_not_open), file_name);
close(fd);
mch_remove(file_name);
goto theend;
}
/* Undo must be synced. */
u_sync(TRUE);
/*
* Write the header. Initializes encryption, if enabled.
*/
bi.bi_buf = buf;
bi.bi_fp = fp;
if (serialize_header(&bi, hash) == FAIL)
goto write_error;
/*
* Iteratively serialize UHPs and their UEPs from the top down.
*/
mark = ++lastmark;
uhp = buf->b_u_oldhead;
while (uhp != NULL)
{
/* Serialize current UHP if we haven't seen it */
if (uhp->uh_walk != mark)
{
uhp->uh_walk = mark;
#ifdef U_DEBUG
++headers_written;
#endif
if (serialize_uhp(&bi, uhp) == FAIL)
goto write_error;
}
/* Now walk through the tree - algorithm from undo_time(). */
if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != mark)
uhp = uhp->uh_prev.ptr;
else if (uhp->uh_alt_next.ptr != NULL
&& uhp->uh_alt_next.ptr->uh_walk != mark)
uhp = uhp->uh_alt_next.ptr;
else if (uhp->uh_next.ptr != NULL && uhp->uh_alt_prev.ptr == NULL
&& uhp->uh_next.ptr->uh_walk != mark)
uhp = uhp->uh_next.ptr;
else if (uhp->uh_alt_prev.ptr != NULL)
uhp = uhp->uh_alt_prev.ptr;
else
uhp = uhp->uh_next.ptr;
}
if (undo_write_bytes(&bi, (long_u)UF_HEADER_END_MAGIC, 2) == OK)
write_ok = TRUE;
#ifdef U_DEBUG
if (headers_written != buf->b_u_numhead)
{
EMSGN("Written %ld headers, ...", headers_written);
EMSGN("... but numhead is %ld", buf->b_u_numhead);
}
#endif
#ifdef FEAT_CRYPT
if (bi.bi_state != NULL && undo_flush(&bi) == FAIL)
write_ok = FALSE;
#endif
write_error:
fclose(fp);
if (!write_ok)
EMSG2(_("E829: write error in undo file: %s"), file_name);
#if defined(MACOS_CLASSIC) || defined(WIN3264)
/* Copy file attributes; for systems where this can only be done after
* closing the file. */
if (buf->b_ffname != NULL)
(void)mch_copy_file_attribute(buf->b_ffname, file_name);
#endif
#ifdef HAVE_ACL
if (buf->b_ffname != NULL)
{
vim_acl_T acl;
/* For systems that support ACL: get the ACL from the original file. */
acl = mch_get_acl(buf->b_ffname);
mch_set_acl(file_name, acl);
mch_free_acl(acl);
}
#endif
theend:
#ifdef FEAT_CRYPT
if (bi.bi_state != NULL)
crypt_free_state(bi.bi_state);
vim_free(bi.bi_buffer);
#endif
if (file_name != name)
vim_free(file_name);
}
/*
* Load the undo tree from an undo file.
* If "name" is not NULL use it as the undo file name. This also means being
* a bit more verbose.
* Otherwise use curbuf->b_ffname to generate the undo file name.
* "hash[UNDO_HASH_SIZE]" must be the hash value of the buffer text.
*/
void
u_read_undo(char_u *name, char_u *hash, char_u *orig_name)
{
char_u *file_name;
FILE *fp;
long version, str_len;
char_u *line_ptr = NULL;
linenr_T line_lnum;
colnr_T line_colnr;
linenr_T line_count;
int num_head = 0;
long old_header_seq, new_header_seq, cur_header_seq;
long seq_last, seq_cur;
long last_save_nr = 0;
short old_idx = -1, new_idx = -1, cur_idx = -1;
long num_read_uhps = 0;
time_t seq_time;
int i, j;
int c;
u_header_T *uhp;
u_header_T **uhp_table = NULL;
char_u read_hash[UNDO_HASH_SIZE];
char_u magic_buf[UF_START_MAGIC_LEN];
#ifdef U_DEBUG
int *uhp_table_used;
#endif
#ifdef UNIX
stat_T st_orig;
stat_T st_undo;
#endif
bufinfo_T bi;
vim_memset(&bi, 0, sizeof(bi));
if (name == NULL)
{
file_name = u_get_undo_file_name(curbuf->b_ffname, TRUE);
if (file_name == NULL)
return;
#ifdef UNIX
/* For safety we only read an undo file if the owner is equal to the
* owner of the text file or equal to the current user. */
if (mch_stat((char *)orig_name, &st_orig) >= 0
&& mch_stat((char *)file_name, &st_undo) >= 0
&& st_orig.st_uid != st_undo.st_uid
&& st_undo.st_uid != getuid())
{
if (p_verbose > 0)
{
verbose_enter();
smsg((char_u *)_("Not reading undo file, owner differs: %s"),
file_name);
verbose_leave();
}
return;
}
#endif
}
else
file_name = name;
if (p_verbose > 0)
{
verbose_enter();
smsg((char_u *)_("Reading undo file: %s"), file_name);
verbose_leave();
}
fp = mch_fopen((char *)file_name, "r");
if (fp == NULL)
{
if (name != NULL || p_verbose > 0)
EMSG2(_("E822: Cannot open undo file for reading: %s"), file_name);
goto error;
}
bi.bi_buf = curbuf;
bi.bi_fp = fp;
/*
* Read the undo file header.
*/
if (fread(magic_buf, UF_START_MAGIC_LEN, 1, fp) != 1
|| memcmp(magic_buf, UF_START_MAGIC, UF_START_MAGIC_LEN) != 0)
{
EMSG2(_("E823: Not an undo file: %s"), file_name);
goto error;
}
version = get2c(fp);
if (version == UF_VERSION_CRYPT)
{
#ifdef FEAT_CRYPT
if (*curbuf->b_p_key == NUL)
{
EMSG2(_("E832: Non-encrypted file has encrypted undo file: %s"),
file_name);
goto error;
}
bi.bi_state = crypt_create_from_file(fp, curbuf->b_p_key);
if (bi.bi_state == NULL)
{
EMSG2(_("E826: Undo file decryption failed: %s"), file_name);
goto error;
}
if (crypt_whole_undofile(bi.bi_state->method_nr))
{
bi.bi_buffer = alloc(CRYPT_BUF_SIZE);
if (bi.bi_buffer == NULL)
{
crypt_free_state(bi.bi_state);
bi.bi_state = NULL;
goto error;
}
bi.bi_avail = 0;
bi.bi_used = 0;
}
#else
EMSG2(_("E827: Undo file is encrypted: %s"), file_name);
goto error;
#endif
}
else if (version != UF_VERSION)
{
EMSG2(_("E824: Incompatible undo file: %s"), file_name);
goto error;
}
if (undo_read(&bi, read_hash, (size_t)UNDO_HASH_SIZE) == FAIL)
{
corruption_error("hash", file_name);
goto error;
}
line_count = (linenr_T)undo_read_4c(&bi);
if (memcmp(hash, read_hash, UNDO_HASH_SIZE) != 0
|| line_count != curbuf->b_ml.ml_line_count)
{
if (p_verbose > 0 || name != NULL)
{
if (name == NULL)
verbose_enter();
give_warning((char_u *)
_("File contents changed, cannot use undo info"), TRUE);
if (name == NULL)
verbose_leave();
}
goto error;
}
/* Read undo data for "U" command. */
str_len = undo_read_4c(&bi);
if (str_len < 0)
goto error;
if (str_len > 0)
line_ptr = read_string_decrypt(&bi, str_len);
line_lnum = (linenr_T)undo_read_4c(&bi);
line_colnr = (colnr_T)undo_read_4c(&bi);
if (line_lnum < 0 || line_colnr < 0)
{
corruption_error("line lnum/col", file_name);
goto error;
}
/* Begin general undo data */
old_header_seq = undo_read_4c(&bi);
new_header_seq = undo_read_4c(&bi);
cur_header_seq = undo_read_4c(&bi);
num_head = undo_read_4c(&bi);
seq_last = undo_read_4c(&bi);
seq_cur = undo_read_4c(&bi);
seq_time = undo_read_time(&bi);
/* Optional header fields. */
for (;;)
{
int len = undo_read_byte(&bi);
int what;
if (len == 0 || len == EOF)
break;
what = undo_read_byte(&bi);
switch (what)
{
case UF_LAST_SAVE_NR:
last_save_nr = undo_read_4c(&bi);
break;
default:
/* field not supported, skip */
while (--len >= 0)
(void)undo_read_byte(&bi);
}
}
/* uhp_table will store the freshly created undo headers we allocate
* until we insert them into curbuf. The table remains sorted by the
* sequence numbers of the headers.
* When there are no headers uhp_table is NULL. */
if (num_head > 0)
{
uhp_table = (u_header_T **)U_ALLOC_LINE(
num_head * sizeof(u_header_T *));
if (uhp_table == NULL)
goto error;
}
while ((c = undo_read_2c(&bi)) == UF_HEADER_MAGIC)
{
if (num_read_uhps >= num_head)
{
corruption_error("num_head too small", file_name);
goto error;
}
uhp = unserialize_uhp(&bi, file_name);
if (uhp == NULL)
goto error;
uhp_table[num_read_uhps++] = uhp;
}
if (num_read_uhps != num_head)
{
corruption_error("num_head", file_name);
goto error;
}
if (c != UF_HEADER_END_MAGIC)
{
corruption_error("end marker", file_name);
goto error;
}
#ifdef U_DEBUG
uhp_table_used = (int *)alloc_clear(
(unsigned)(sizeof(int) * num_head + 1));
# define SET_FLAG(j) ++uhp_table_used[j]
#else
# define SET_FLAG(j)
#endif
/* We have put all of the headers into a table. Now we iterate through the
* table and swizzle each sequence number we have stored in uh_*_seq into
* a pointer corresponding to the header with that sequence number. */
for (i = 0; i < num_head; i++)
{
uhp = uhp_table[i];
if (uhp == NULL)
continue;
for (j = 0; j < num_head; j++)
if (uhp_table[j] != NULL && i != j
&& uhp_table[i]->uh_seq == uhp_table[j]->uh_seq)
{
corruption_error("duplicate uh_seq", file_name);
goto error;
}
for (j = 0; j < num_head; j++)
if (uhp_table[j] != NULL
&& uhp_table[j]->uh_seq == uhp->uh_next.seq)
{
uhp->uh_next.ptr = uhp_table[j];
SET_FLAG(j);
break;
}
for (j = 0; j < num_head; j++)
if (uhp_table[j] != NULL
&& uhp_table[j]->uh_seq == uhp->uh_prev.seq)
{
uhp->uh_prev.ptr = uhp_table[j];
SET_FLAG(j);
break;
}
for (j = 0; j < num_head; j++)
if (uhp_table[j] != NULL
&& uhp_table[j]->uh_seq == uhp->uh_alt_next.seq)
{
uhp->uh_alt_next.ptr = uhp_table[j];
SET_FLAG(j);
break;
}
for (j = 0; j < num_head; j++)
if (uhp_table[j] != NULL
&& uhp_table[j]->uh_seq == uhp->uh_alt_prev.seq)
{
uhp->uh_alt_prev.ptr = uhp_table[j];
SET_FLAG(j);
break;
}
if (old_header_seq > 0 && old_idx < 0 && uhp->uh_seq == old_header_seq)
{
old_idx = i;
SET_FLAG(i);
}
if (new_header_seq > 0 && new_idx < 0 && uhp->uh_seq == new_header_seq)
{
new_idx = i;
SET_FLAG(i);
}
if (cur_header_seq > 0 && cur_idx < 0 && uhp->uh_seq == cur_header_seq)
{
cur_idx = i;
SET_FLAG(i);
}
}
/* Now that we have read the undo info successfully, free the current undo
* info and use the info from the file. */
u_blockfree(curbuf);
curbuf->b_u_oldhead = old_idx < 0 ? NULL : uhp_table[old_idx];
curbuf->b_u_newhead = new_idx < 0 ? NULL : uhp_table[new_idx];
curbuf->b_u_curhead = cur_idx < 0 ? NULL : uhp_table[cur_idx];
curbuf->b_u_line_ptr = line_ptr;
curbuf->b_u_line_lnum = line_lnum;
curbuf->b_u_line_colnr = line_colnr;
curbuf->b_u_numhead = num_head;
curbuf->b_u_seq_last = seq_last;
curbuf->b_u_seq_cur = seq_cur;
curbuf->b_u_time_cur = seq_time;
curbuf->b_u_save_nr_last = last_save_nr;
curbuf->b_u_save_nr_cur = last_save_nr;
curbuf->b_u_synced = TRUE;
vim_free(uhp_table);
#ifdef U_DEBUG
for (i = 0; i < num_head; ++i)
if (uhp_table_used[i] == 0)
EMSGN("uhp_table entry %ld not used, leaking memory", i);
vim_free(uhp_table_used);
u_check(TRUE);
#endif
if (name != NULL)
smsg((char_u *)_("Finished reading undo file %s"), file_name);
goto theend;
error:
vim_free(line_ptr);
if (uhp_table != NULL)
{
for (i = 0; i < num_read_uhps; i++)
if (uhp_table[i] != NULL)
u_free_uhp(uhp_table[i]);
vim_free(uhp_table);
}
theend:
#ifdef FEAT_CRYPT
if (bi.bi_state != NULL)
crypt_free_state(bi.bi_state);
vim_free(bi.bi_buffer);
#endif
if (fp != NULL)
fclose(fp);
if (file_name != name)
vim_free(file_name);
return;
}
#endif /* FEAT_PERSISTENT_UNDO */
/*
* If 'cpoptions' contains 'u': Undo the previous undo or redo (vi compatible).
* If 'cpoptions' does not contain 'u': Always undo.
*/
void
u_undo(int count)
{
/*
* If we get an undo command while executing a macro, we behave like the
* original vi. If this happens twice in one macro the result will not
* be compatible.
*/
if (curbuf->b_u_synced == FALSE)
{
u_sync(TRUE);
count = 1;
}
if (vim_strchr(p_cpo, CPO_UNDO) == NULL)
undo_undoes = TRUE;
else
undo_undoes = !undo_undoes;
u_doit(count);
}
/*
* If 'cpoptions' contains 'u': Repeat the previous undo or redo.
* If 'cpoptions' does not contain 'u': Always redo.
*/
void
u_redo(int count)
{
if (vim_strchr(p_cpo, CPO_UNDO) == NULL)
undo_undoes = FALSE;
u_doit(count);
}
/*
* Undo or redo, depending on 'undo_undoes', 'count' times.
*/
static void
u_doit(int startcount)
{
int count = startcount;
if (!undo_allowed())
return;
u_newcount = 0;
u_oldcount = 0;
if (curbuf->b_ml.ml_flags & ML_EMPTY)
u_oldcount = -1;
while (count--)
{
/* Do the change warning now, so that it triggers FileChangedRO when
* needed. This may cause the file to be reloaded, that must happen
* before we do anything, because it may change curbuf->b_u_curhead
* and more. */
change_warning(0);
if (undo_undoes)
{
if (curbuf->b_u_curhead == NULL) /* first undo */
curbuf->b_u_curhead = curbuf->b_u_newhead;
else if (get_undolevel() > 0) /* multi level undo */
/* get next undo */
curbuf->b_u_curhead = curbuf->b_u_curhead->uh_next.ptr;
/* nothing to undo */
if (curbuf->b_u_numhead == 0 || curbuf->b_u_curhead == NULL)
{
/* stick curbuf->b_u_curhead at end */
curbuf->b_u_curhead = curbuf->b_u_oldhead;
beep_flush();
if (count == startcount - 1)
{
MSG(_("Already at oldest change"));
return;
}
break;
}
u_undoredo(TRUE);
}
else
{
if (curbuf->b_u_curhead == NULL || get_undolevel() <= 0)
{
beep_flush(); /* nothing to redo */
if (count == startcount - 1)
{
MSG(_("Already at newest change"));
return;
}
break;
}
u_undoredo(FALSE);
/* Advance for next redo. Set "newhead" when at the end of the
* redoable changes. */
if (curbuf->b_u_curhead->uh_prev.ptr == NULL)
curbuf->b_u_newhead = curbuf->b_u_curhead;
curbuf->b_u_curhead = curbuf->b_u_curhead->uh_prev.ptr;
}
}
u_undo_end(undo_undoes, FALSE);
}
/*
* Undo or redo over the timeline.
* When "step" is negative go back in time, otherwise goes forward in time.
* When "sec" is FALSE make "step" steps, when "sec" is TRUE use "step" as
* seconds.
* When "file" is TRUE use "step" as a number of file writes.
* When "absolute" is TRUE use "step" as the sequence number to jump to.
* "sec" must be FALSE then.
*/
void
undo_time(
long step,
int sec,
int file,
int absolute)
{
long target;
long closest;
long closest_start;
long closest_seq = 0;
long val;
u_header_T *uhp;
u_header_T *last;
int mark;
int nomark;
int round;
int dosec = sec;
int dofile = file;
int above = FALSE;
int did_undo = TRUE;
/* First make sure the current undoable change is synced. */
if (curbuf->b_u_synced == FALSE)
u_sync(TRUE);
u_newcount = 0;
u_oldcount = 0;
if (curbuf->b_ml.ml_flags & ML_EMPTY)
u_oldcount = -1;
/* "target" is the node below which we want to be.
* Init "closest" to a value we can't reach. */
if (absolute)
{
if (step == 0)
{
/* target 0 does not exist, got to 1 and above it. */
target = 1;
above = TRUE;
}
else
target = step;
closest = -1;
}
else
{
/* When doing computations with time_t subtract starttime, because
* time_t converted to a long may result in a wrong number. */
if (dosec)
target = (long)(curbuf->b_u_time_cur - starttime) + step;
else if (dofile)
{
if (step < 0)
{
/* Going back to a previous write. If there were changes after
* the last write, count that as moving one file-write, so
* that ":earlier 1f" undoes all changes since the last save. */
uhp = curbuf->b_u_curhead;
if (uhp != NULL)
uhp = uhp->uh_next.ptr;
else
uhp = curbuf->b_u_newhead;
if (uhp != NULL && uhp->uh_save_nr != 0)
/* "uh_save_nr" was set in the last block, that means
* there were no changes since the last write */
target = curbuf->b_u_save_nr_cur + step;
else
/* count the changes since the last write as one step */
target = curbuf->b_u_save_nr_cur + step + 1;
if (target <= 0)
/* Go to before first write: before the oldest change. Use
* the sequence number for that. */
dofile = FALSE;
}
else
{
/* Moving forward to a newer write. */
target = curbuf->b_u_save_nr_cur + step;
if (target > curbuf->b_u_save_nr_last)
{
/* Go to after last write: after the latest change. Use
* the sequence number for that. */
target = curbuf->b_u_seq_last + 1;
dofile = FALSE;
}
}
}
else
target = curbuf->b_u_seq_cur + step;
if (step < 0)
{
if (target < 0)
target = 0;
closest = -1;
}
else
{
if (dosec)
closest = (long)(vim_time() - starttime + 1);
else if (dofile)
closest = curbuf->b_u_save_nr_last + 2;
else
closest = curbuf->b_u_seq_last + 2;
if (target >= closest)
target = closest - 1;
}
}
closest_start = closest;
closest_seq = curbuf->b_u_seq_cur;
/*
* May do this twice:
* 1. Search for "target", update "closest" to the best match found.
* 2. If "target" not found search for "closest".
*
* When using the closest time we use the sequence number in the second
* round, because there may be several entries with the same time.
*/
for (round = 1; round <= 2; ++round)
{
/* Find the path from the current state to where we want to go. The
* desired state can be anywhere in the undo tree, need to go all over
* it. We put "nomark" in uh_walk where we have been without success,
* "mark" where it could possibly be. */
mark = ++lastmark;
nomark = ++lastmark;
if (curbuf->b_u_curhead == NULL) /* at leaf of the tree */
uhp = curbuf->b_u_newhead;
else
uhp = curbuf->b_u_curhead;
while (uhp != NULL)
{
uhp->uh_walk = mark;
if (dosec)
val = (long)(uhp->uh_time - starttime);
else if (dofile)
val = uhp->uh_save_nr;
else
val = uhp->uh_seq;
if (round == 1 && !(dofile && val == 0))
{
/* Remember the header that is closest to the target.
* It must be at least in the right direction (checked with
* "b_u_seq_cur"). When the timestamp is equal find the
* highest/lowest sequence number. */
if ((step < 0 ? uhp->uh_seq <= curbuf->b_u_seq_cur
: uhp->uh_seq > curbuf->b_u_seq_cur)
&& ((dosec && val == closest)
? (step < 0
? uhp->uh_seq < closest_seq
: uhp->uh_seq > closest_seq)
: closest == closest_start
|| (val > target
? (closest > target
? val - target <= closest - target
: val - target <= target - closest)
: (closest > target
? target - val <= closest - target
: target - val <= target - closest))))
{
closest = val;
closest_seq = uhp->uh_seq;
}
}
/* Quit searching when we found a match. But when searching for a
* time we need to continue looking for the best uh_seq. */
if (target == val && !dosec)
{
target = uhp->uh_seq;
break;
}
/* go down in the tree if we haven't been there */
if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != nomark
&& uhp->uh_prev.ptr->uh_walk != mark)
uhp = uhp->uh_prev.ptr;
/* go to alternate branch if we haven't been there */
else if (uhp->uh_alt_next.ptr != NULL
&& uhp->uh_alt_next.ptr->uh_walk != nomark
&& uhp->uh_alt_next.ptr->uh_walk != mark)
uhp = uhp->uh_alt_next.ptr;
/* go up in the tree if we haven't been there and we are at the
* start of alternate branches */
else if (uhp->uh_next.ptr != NULL && uhp->uh_alt_prev.ptr == NULL
&& uhp->uh_next.ptr->uh_walk != nomark
&& uhp->uh_next.ptr->uh_walk != mark)
{
/* If still at the start we don't go through this change. */
if (uhp == curbuf->b_u_curhead)
uhp->uh_walk = nomark;
uhp = uhp->uh_next.ptr;
}
else
{
/* need to backtrack; mark this node as useless */
uhp->uh_walk = nomark;
if (uhp->uh_alt_prev.ptr != NULL)
uhp = uhp->uh_alt_prev.ptr;
else
uhp = uhp->uh_next.ptr;
}
}
if (uhp != NULL) /* found it */
break;
if (absolute)
{
EMSGN(_("E830: Undo number %ld not found"), step);
return;
}
if (closest == closest_start)
{
if (step < 0)
MSG(_("Already at oldest change"));
else
MSG(_("Already at newest change"));
return;
}
target = closest_seq;
dosec = FALSE;
dofile = FALSE;
if (step < 0)
above = TRUE; /* stop above the header */
}
/* If we found it: Follow the path to go to where we want to be. */
if (uhp != NULL)
{
/*
* First go up the tree as much as needed.
*/
while (!got_int)
{
/* Do the change warning now, for the same reason as above. */
change_warning(0);
uhp = curbuf->b_u_curhead;
if (uhp == NULL)
uhp = curbuf->b_u_newhead;
else
uhp = uhp->uh_next.ptr;
if (uhp == NULL || uhp->uh_walk != mark
|| (uhp->uh_seq == target && !above))
break;
curbuf->b_u_curhead = uhp;
u_undoredo(TRUE);
uhp->uh_walk = nomark; /* don't go back down here */
}
/*
* And now go down the tree (redo), branching off where needed.
*/
while (!got_int)
{
/* Do the change warning now, for the same reason as above. */
change_warning(0);
uhp = curbuf->b_u_curhead;
if (uhp == NULL)
break;
/* Go back to the first branch with a mark. */
while (uhp->uh_alt_prev.ptr != NULL
&& uhp->uh_alt_prev.ptr->uh_walk == mark)
uhp = uhp->uh_alt_prev.ptr;
/* Find the last branch with a mark, that's the one. */
last = uhp;
while (last->uh_alt_next.ptr != NULL
&& last->uh_alt_next.ptr->uh_walk == mark)
last = last->uh_alt_next.ptr;
if (last != uhp)
{
/* Make the used branch the first entry in the list of
* alternatives to make "u" and CTRL-R take this branch. */
while (uhp->uh_alt_prev.ptr != NULL)
uhp = uhp->uh_alt_prev.ptr;
if (last->uh_alt_next.ptr != NULL)
last->uh_alt_next.ptr->uh_alt_prev.ptr =
last->uh_alt_prev.ptr;
last->uh_alt_prev.ptr->uh_alt_next.ptr = last->uh_alt_next.ptr;
last->uh_alt_prev.ptr = NULL;
last->uh_alt_next.ptr = uhp;
uhp->uh_alt_prev.ptr = last;
if (curbuf->b_u_oldhead == uhp)
curbuf->b_u_oldhead = last;
uhp = last;
if (uhp->uh_next.ptr != NULL)
uhp->uh_next.ptr->uh_prev.ptr = uhp;
}
curbuf->b_u_curhead = uhp;
if (uhp->uh_walk != mark)
break; /* must have reached the target */
/* Stop when going backwards in time and didn't find the exact
* header we were looking for. */
if (uhp->uh_seq == target && above)
{
curbuf->b_u_seq_cur = target - 1;
break;
}
u_undoredo(FALSE);
/* Advance "curhead" to below the header we last used. If it
* becomes NULL then we need to set "newhead" to this leaf. */
if (uhp->uh_prev.ptr == NULL)
curbuf->b_u_newhead = uhp;
curbuf->b_u_curhead = uhp->uh_prev.ptr;
did_undo = FALSE;
if (uhp->uh_seq == target) /* found it! */
break;
uhp = uhp->uh_prev.ptr;
if (uhp == NULL || uhp->uh_walk != mark)
{
/* Need to redo more but can't find it... */
internal_error("undo_time()");
break;
}
}
}
u_undo_end(did_undo, absolute);
}
/*
* u_undoredo: common code for undo and redo
*
* The lines in the file are replaced by the lines in the entry list at
* curbuf->b_u_curhead. The replaced lines in the file are saved in the entry
* list for the next undo/redo.
*
* When "undo" is TRUE we go up in the tree, when FALSE we go down.
*/
static void
u_undoredo(int undo)
{
char_u **newarray = NULL;
linenr_T oldsize;
linenr_T newsize;
linenr_T top, bot;
linenr_T lnum;
linenr_T newlnum = MAXLNUM;
long i;
u_entry_T *uep, *nuep;
u_entry_T *newlist = NULL;
int old_flags;
int new_flags;
pos_T namedm[NMARKS];
visualinfo_T visualinfo;
int empty_buffer; /* buffer became empty */
u_header_T *curhead = curbuf->b_u_curhead;
#ifdef FEAT_AUTOCMD
/* Don't want autocommands using the undo structures here, they are
* invalid till the end. */
block_autocmds();
#endif
#ifdef U_DEBUG
u_check(FALSE);
#endif
old_flags = curhead->uh_flags;
new_flags = (curbuf->b_changed ? UH_CHANGED : 0) +
((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);
setpcmark();
/*
* save marks before undo/redo
*/
mch_memmove(namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);
visualinfo = curbuf->b_visual;
curbuf->b_op_start.lnum = curbuf->b_ml.ml_line_count;
curbuf->b_op_start.col = 0;
curbuf->b_op_end.lnum = 0;
curbuf->b_op_end.col = 0;
for (uep = curhead->uh_entry; uep != NULL; uep = nuep)
{
top = uep->ue_top;
bot = uep->ue_bot;
if (bot == 0)
bot = curbuf->b_ml.ml_line_count + 1;
if (top > curbuf->b_ml.ml_line_count || top >= bot
|| bot > curbuf->b_ml.ml_line_count + 1)
{
#ifdef FEAT_AUTOCMD
unblock_autocmds();
#endif
IEMSG(_("E438: u_undo: line numbers wrong"));
changed(); /* don't want UNCHANGED now */
return;
}
oldsize = bot - top - 1; /* number of lines before undo */
newsize = uep->ue_size; /* number of lines after undo */
if (top < newlnum)
{
/* If the saved cursor is somewhere in this undo block, move it to
* the remembered position. Makes "gwap" put the cursor back
* where it was. */
lnum = curhead->uh_cursor.lnum;
if (lnum >= top && lnum <= top + newsize + 1)
{
curwin->w_cursor = curhead->uh_cursor;
newlnum = curwin->w_cursor.lnum - 1;
}
else
{
/* Use the first line that actually changed. Avoids that
* undoing auto-formatting puts the cursor in the previous
* line. */
for (i = 0; i < newsize && i < oldsize; ++i)
if (STRCMP(uep->ue_array[i], ml_get(top + 1 + i)) != 0)
break;
if (i == newsize && newlnum == MAXLNUM && uep->ue_next == NULL)
{
newlnum = top;
curwin->w_cursor.lnum = newlnum + 1;
}
else if (i < newsize)
{
newlnum = top + i;
curwin->w_cursor.lnum = newlnum + 1;
}
}
}
empty_buffer = FALSE;
/* delete the lines between top and bot and save them in newarray */
if (oldsize > 0)
{
if ((newarray = (char_u **)U_ALLOC_LINE(
sizeof(char_u *) * oldsize)) == NULL)
{
do_outofmem_msg((long_u)(sizeof(char_u *) * oldsize));
/*
* We have messed up the entry list, repair is impossible.
* we have to free the rest of the list.
*/
while (uep != NULL)
{
nuep = uep->ue_next;
u_freeentry(uep, uep->ue_size);
uep = nuep;
}
break;
}
/* delete backwards, it goes faster in most cases */
for (lnum = bot - 1, i = oldsize; --i >= 0; --lnum)
{
/* what can we do when we run out of memory? */
if ((newarray[i] = u_save_line(lnum)) == NULL)
do_outofmem_msg((long_u)0);
/* remember we deleted the last line in the buffer, and a
* dummy empty line will be inserted */
if (curbuf->b_ml.ml_line_count == 1)
empty_buffer = TRUE;
ml_delete(lnum, FALSE);
}
}
else
newarray = NULL;
/* insert the lines in u_array between top and bot */
if (newsize)
{
for (lnum = top, i = 0; i < newsize; ++i, ++lnum)
{
/*
* If the file is empty, there is an empty line 1 that we
* should get rid of, by replacing it with the new line
*/
if (empty_buffer && lnum == 0)
ml_replace((linenr_T)1, uep->ue_array[i], TRUE);
else
ml_append(lnum, uep->ue_array[i], (colnr_T)0, FALSE);
vim_free(uep->ue_array[i]);
}
vim_free((char_u *)uep->ue_array);
}
/* adjust marks */
if (oldsize != newsize)
{
mark_adjust(top + 1, top + oldsize, (long)MAXLNUM,
(long)newsize - (long)oldsize);
if (curbuf->b_op_start.lnum > top + oldsize)
curbuf->b_op_start.lnum += newsize - oldsize;
if (curbuf->b_op_end.lnum > top + oldsize)
curbuf->b_op_end.lnum += newsize - oldsize;
}
changed_lines(top + 1, 0, bot, newsize - oldsize);
/* set '[ and '] mark */
if (top + 1 < curbuf->b_op_start.lnum)
curbuf->b_op_start.lnum = top + 1;
if (newsize == 0 && top + 1 > curbuf->b_op_end.lnum)
curbuf->b_op_end.lnum = top + 1;
else if (top + newsize > curbuf->b_op_end.lnum)
curbuf->b_op_end.lnum = top + newsize;
u_newcount += newsize;
u_oldcount += oldsize;
uep->ue_size = oldsize;
uep->ue_array = newarray;
uep->ue_bot = top + newsize + 1;
/*
* insert this entry in front of the new entry list
*/
nuep = uep->ue_next;
uep->ue_next = newlist;
newlist = uep;
}
curhead->uh_entry = newlist;
curhead->uh_flags = new_flags;
if ((old_flags & UH_EMPTYBUF) && bufempty())
curbuf->b_ml.ml_flags |= ML_EMPTY;
if (old_flags & UH_CHANGED)
changed();
else
#ifdef FEAT_NETBEANS_INTG
/* per netbeans undo rules, keep it as modified */
if (!isNetbeansModified(curbuf))
#endif
unchanged(curbuf, FALSE);
/*
* restore marks from before undo/redo
*/
for (i = 0; i < NMARKS; ++i)
{
if (curhead->uh_namedm[i].lnum != 0)
curbuf->b_namedm[i] = curhead->uh_namedm[i];
if (namedm[i].lnum != 0)
curhead->uh_namedm[i] = namedm[i];
else
curhead->uh_namedm[i].lnum = 0;
}
if (curhead->uh_visual.vi_start.lnum != 0)
{
curbuf->b_visual = curhead->uh_visual;
curhead->uh_visual = visualinfo;
}
/*
* If the cursor is only off by one line, put it at the same position as
* before starting the change (for the "o" command).
* Otherwise the cursor should go to the first undone line.
*/
if (curhead->uh_cursor.lnum + 1 == curwin->w_cursor.lnum
&& curwin->w_cursor.lnum > 1)
--curwin->w_cursor.lnum;
if (curwin->w_cursor.lnum <= curbuf->b_ml.ml_line_count)
{
if (curhead->uh_cursor.lnum == curwin->w_cursor.lnum)
{
curwin->w_cursor.col = curhead->uh_cursor.col;
#ifdef FEAT_VIRTUALEDIT
if (virtual_active() && curhead->uh_cursor_vcol >= 0)
coladvance((colnr_T)curhead->uh_cursor_vcol);
else
curwin->w_cursor.coladd = 0;
#endif
}
else
beginline(BL_SOL | BL_FIX);
}
else
{
/* We get here with the current cursor line being past the end (eg
* after adding lines at the end of the file, and then undoing it).
* check_cursor() will move the cursor to the last line. Move it to
* the first column here. */
curwin->w_cursor.col = 0;
#ifdef FEAT_VIRTUALEDIT
curwin->w_cursor.coladd = 0;
#endif
}
/* Make sure the cursor is on an existing line and column. */
check_cursor();
/* Remember where we are for "g-" and ":earlier 10s". */
curbuf->b_u_seq_cur = curhead->uh_seq;
if (undo)
/* We are below the previous undo. However, to make ":earlier 1s"
* work we compute this as being just above the just undone change. */
--curbuf->b_u_seq_cur;
/* Remember where we are for ":earlier 1f" and ":later 1f". */
if (curhead->uh_save_nr != 0)
{
if (undo)
curbuf->b_u_save_nr_cur = curhead->uh_save_nr - 1;
else
curbuf->b_u_save_nr_cur = curhead->uh_save_nr;
}
/* The timestamp can be the same for multiple changes, just use the one of
* the undone/redone change. */
curbuf->b_u_time_cur = curhead->uh_time;
#ifdef FEAT_AUTOCMD
unblock_autocmds();
#endif
#ifdef U_DEBUG
u_check(FALSE);
#endif
}
/*
* If we deleted or added lines, report the number of less/more lines.
* Otherwise, report the number of changes (this may be incorrect
* in some cases, but it's better than nothing).
*/
static void
u_undo_end(
int did_undo, /* just did an undo */
int absolute) /* used ":undo N" */
{
char *msgstr;
u_header_T *uhp;
char_u msgbuf[80];
#ifdef FEAT_FOLDING
if ((fdo_flags & FDO_UNDO) && KeyTyped)
foldOpenCursor();
#endif
if (global_busy /* no messages now, wait until global is finished */
|| !messaging()) /* 'lazyredraw' set, don't do messages now */
return;
if (curbuf->b_ml.ml_flags & ML_EMPTY)
--u_newcount;
u_oldcount -= u_newcount;
if (u_oldcount == -1)
msgstr = N_("more line");
else if (u_oldcount < 0)
msgstr = N_("more lines");
else if (u_oldcount == 1)
msgstr = N_("line less");
else if (u_oldcount > 1)
msgstr = N_("fewer lines");
else
{
u_oldcount = u_newcount;
if (u_newcount == 1)
msgstr = N_("change");
else
msgstr = N_("changes");
}
if (curbuf->b_u_curhead != NULL)
{
/* For ":undo N" we prefer a "after #N" message. */
if (absolute && curbuf->b_u_curhead->uh_next.ptr != NULL)
{
uhp = curbuf->b_u_curhead->uh_next.ptr;
did_undo = FALSE;
}
else if (did_undo)
uhp = curbuf->b_u_curhead;
else
uhp = curbuf->b_u_curhead->uh_next.ptr;
}
else
uhp = curbuf->b_u_newhead;
if (uhp == NULL)
*msgbuf = NUL;
else
u_add_time(msgbuf, sizeof(msgbuf), uhp->uh_time);
#ifdef FEAT_CONCEAL
{
win_T *wp;
FOR_ALL_WINDOWS(wp)
{
if (wp->w_buffer == curbuf && wp->w_p_cole > 0)
redraw_win_later(wp, NOT_VALID);
}
}
#endif
smsg((char_u *)_("%ld %s; %s #%ld %s"),
u_oldcount < 0 ? -u_oldcount : u_oldcount,
_(msgstr),
did_undo ? _("before") : _("after"),
uhp == NULL ? 0L : uhp->uh_seq,
msgbuf);
}
/*
* u_sync: stop adding to the current entry list
*/
void
u_sync(
int force) /* Also sync when no_u_sync is set. */
{
/* Skip it when already synced or syncing is disabled. */
if (curbuf->b_u_synced || (!force && no_u_sync > 0))
return;
#if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
if (im_is_preediting())
return; /* XIM is busy, don't break an undo sequence */
#endif
if (get_undolevel() < 0)
curbuf->b_u_synced = TRUE; /* no entries, nothing to do */
else
{
u_getbot(); /* compute ue_bot of previous u_save */
curbuf->b_u_curhead = NULL;
}
}
/*
* ":undolist": List the leafs of the undo tree
*/
void
ex_undolist(exarg_T *eap UNUSED)
{
garray_T ga;
u_header_T *uhp;
int mark;
int nomark;
int changes = 1;
int i;
/*
* 1: walk the tree to find all leafs, put the info in "ga".
* 2: sort the lines
* 3: display the list
*/
mark = ++lastmark;
nomark = ++lastmark;
ga_init2(&ga, (int)sizeof(char *), 20);
uhp = curbuf->b_u_oldhead;
while (uhp != NULL)
{
if (uhp->uh_prev.ptr == NULL && uhp->uh_walk != nomark
&& uhp->uh_walk != mark)
{
if (ga_grow(&ga, 1) == FAIL)
break;
vim_snprintf((char *)IObuff, IOSIZE, "%6ld %7ld ",
uhp->uh_seq, changes);
u_add_time(IObuff + STRLEN(IObuff), IOSIZE - STRLEN(IObuff),
uhp->uh_time);
if (uhp->uh_save_nr > 0)
{
while (STRLEN(IObuff) < 33)
STRCAT(IObuff, " ");
vim_snprintf_add((char *)IObuff, IOSIZE,
" %3ld", uhp->uh_save_nr);
}
((char_u **)(ga.ga_data))[ga.ga_len++] = vim_strsave(IObuff);
}
uhp->uh_walk = mark;
/* go down in the tree if we haven't been there */
if (uhp->uh_prev.ptr != NULL && uhp->uh_prev.ptr->uh_walk != nomark
&& uhp->uh_prev.ptr->uh_walk != mark)
{
uhp = uhp->uh_prev.ptr;
++changes;
}
/* go to alternate branch if we haven't been there */
else if (uhp->uh_alt_next.ptr != NULL
&& uhp->uh_alt_next.ptr->uh_walk != nomark
&& uhp->uh_alt_next.ptr->uh_walk != mark)
uhp = uhp->uh_alt_next.ptr;
/* go up in the tree if we haven't been there and we are at the
* start of alternate branches */
else if (uhp->uh_next.ptr != NULL && uhp->uh_alt_prev.ptr == NULL
&& uhp->uh_next.ptr->uh_walk != nomark
&& uhp->uh_next.ptr->uh_walk != mark)
{
uhp = uhp->uh_next.ptr;
--changes;
}
else
{
/* need to backtrack; mark this node as done */
uhp->uh_walk = nomark;
if (uhp->uh_alt_prev.ptr != NULL)
uhp = uhp->uh_alt_prev.ptr;
else
{
uhp = uhp->uh_next.ptr;
--changes;
}
}
}
if (ga.ga_len == 0)
MSG(_("Nothing to undo"));
else
{
sort_strings((char_u **)ga.ga_data, ga.ga_len);
msg_start();
msg_puts_attr((char_u *)_("number changes when saved"),
hl_attr(HLF_T));
for (i = 0; i < ga.ga_len && !got_int; ++i)
{
msg_putchar('\n');
if (got_int)
break;
msg_puts(((char_u **)ga.ga_data)[i]);
}
msg_end();
ga_clear_strings(&ga);
}
}
/*
* Put the timestamp of an undo header in "buf[buflen]" in a nice format.
*/
static void
u_add_time(char_u *buf, size_t buflen, time_t tt)
{
#ifdef HAVE_STRFTIME
struct tm *curtime;
if (vim_time() - tt >= 100)
{
curtime = localtime(&tt);
if (vim_time() - tt < (60L * 60L * 12L))
/* within 12 hours */
(void)strftime((char *)buf, buflen, "%H:%M:%S", curtime);
else
/* longer ago */
(void)strftime((char *)buf, buflen, "%Y/%m/%d %H:%M:%S", curtime);
}
else
#endif
vim_snprintf((char *)buf, buflen, _("%ld seconds ago"),
(long)(vim_time() - tt));
}
/*
* ":undojoin": continue adding to the last entry list
*/
void
ex_undojoin(exarg_T *eap UNUSED)
{
if (curbuf->b_u_newhead == NULL)
return; /* nothing changed before */
if (curbuf->b_u_curhead != NULL)
{
EMSG(_("E790: undojoin is not allowed after undo"));
return;
}
if (!curbuf->b_u_synced)
return; /* already unsynced */
if (get_undolevel() < 0)
return; /* no entries, nothing to do */
else
{
/* Go back to the last entry */
curbuf->b_u_curhead = curbuf->b_u_newhead;
curbuf->b_u_synced = FALSE; /* no entries, nothing to do */
}
}
/*
* Called after writing or reloading the file and setting b_changed to FALSE.
* Now an undo means that the buffer is modified.
*/
void
u_unchanged(buf_T *buf)
{
u_unch_branch(buf->b_u_oldhead);
buf->b_did_warn = FALSE;
}
/*
* After reloading a buffer which was saved for 'undoreload': Find the first
* line that was changed and set the cursor there.
*/
void
u_find_first_changed(void)
{
u_header_T *uhp = curbuf->b_u_newhead;
u_entry_T *uep;
linenr_T lnum;
if (curbuf->b_u_curhead != NULL || uhp == NULL)
return; /* undid something in an autocmd? */
/* Check that the last undo block was for the whole file. */
uep = uhp->uh_entry;
if (uep->ue_top != 0 || uep->ue_bot != 0)
return;
for (lnum = 1; lnum < curbuf->b_ml.ml_line_count
&& lnum <= uep->ue_size; ++lnum)
if (STRCMP(ml_get_buf(curbuf, lnum, FALSE),
uep->ue_array[lnum - 1]) != 0)
{
clearpos(&(uhp->uh_cursor));
uhp->uh_cursor.lnum = lnum;
return;
}
if (curbuf->b_ml.ml_line_count != uep->ue_size)
{
/* lines added or deleted at the end, put the cursor there */
clearpos(&(uhp->uh_cursor));
uhp->uh_cursor.lnum = lnum;
}
}
/*
* Increase the write count, store it in the last undo header, what would be
* used for "u".
*/
void
u_update_save_nr(buf_T *buf)
{
u_header_T *uhp;
++buf->b_u_save_nr_last;
buf->b_u_save_nr_cur = buf->b_u_save_nr_last;
uhp = buf->b_u_curhead;
if (uhp != NULL)
uhp = uhp->uh_next.ptr;
else
uhp = buf->b_u_newhead;
if (uhp != NULL)
uhp->uh_save_nr = buf->b_u_save_nr_last;
}
static void
u_unch_branch(u_header_T *uhp)
{
u_header_T *uh;
for (uh = uhp; uh != NULL; uh = uh->uh_prev.ptr)
{
uh->uh_flags |= UH_CHANGED;
if (uh->uh_alt_next.ptr != NULL)
u_unch_branch(uh->uh_alt_next.ptr); /* recursive */
}
}
/*
* Get pointer to last added entry.
* If it's not valid, give an error message and return NULL.
*/
static u_entry_T *
u_get_headentry(void)
{
if (curbuf->b_u_newhead == NULL || curbuf->b_u_newhead->uh_entry == NULL)
{
IEMSG(_("E439: undo list corrupt"));
return NULL;
}
return curbuf->b_u_newhead->uh_entry;
}
/*
* u_getbot(): compute the line number of the previous u_save
* It is called only when b_u_synced is FALSE.
*/
static void
u_getbot(void)
{
u_entry_T *uep;
linenr_T extra;
uep = u_get_headentry(); /* check for corrupt undo list */
if (uep == NULL)
return;
uep = curbuf->b_u_newhead->uh_getbot_entry;
if (uep != NULL)
{
/*
* the new ue_bot is computed from the number of lines that has been
* inserted (0 - deleted) since calling u_save. This is equal to the
* old line count subtracted from the current line count.
*/
extra = curbuf->b_ml.ml_line_count - uep->ue_lcount;
uep->ue_bot = uep->ue_top + uep->ue_size + 1 + extra;
if (uep->ue_bot < 1 || uep->ue_bot > curbuf->b_ml.ml_line_count)
{
IEMSG(_("E440: undo line missing"));
uep->ue_bot = uep->ue_top + 1; /* assume all lines deleted, will
* get all the old lines back
* without deleting the current
* ones */
}
curbuf->b_u_newhead->uh_getbot_entry = NULL;
}
curbuf->b_u_synced = TRUE;
}
/*
* Free one header "uhp" and its entry list and adjust the pointers.
*/
static void
u_freeheader(
buf_T *buf,
u_header_T *uhp,
u_header_T **uhpp) /* if not NULL reset when freeing this header */
{
u_header_T *uhap;
/* When there is an alternate redo list free that branch completely,
* because we can never go there. */
if (uhp->uh_alt_next.ptr != NULL)
u_freebranch(buf, uhp->uh_alt_next.ptr, uhpp);
if (uhp->uh_alt_prev.ptr != NULL)
uhp->uh_alt_prev.ptr->uh_alt_next.ptr = NULL;
/* Update the links in the list to remove the header. */
if (uhp->uh_next.ptr == NULL)
buf->b_u_oldhead = uhp->uh_prev.ptr;
else
uhp->uh_next.ptr->uh_prev.ptr = uhp->uh_prev.ptr;
if (uhp->uh_prev.ptr == NULL)
buf->b_u_newhead = uhp->uh_next.ptr;
else
for (uhap = uhp->uh_prev.ptr; uhap != NULL;
uhap = uhap->uh_alt_next.ptr)
uhap->uh_next.ptr = uhp->uh_next.ptr;
u_freeentries(buf, uhp, uhpp);
}
/*
* Free an alternate branch and any following alternate branches.
*/
static void
u_freebranch(
buf_T *buf,
u_header_T *uhp,
u_header_T **uhpp) /* if not NULL reset when freeing this header */
{
u_header_T *tofree, *next;
/* If this is the top branch we may need to use u_freeheader() to update
* all the pointers. */
if (uhp == buf->b_u_oldhead)
{
while (buf->b_u_oldhead != NULL)
u_freeheader(buf, buf->b_u_oldhead, uhpp);
return;
}
if (uhp->uh_alt_prev.ptr != NULL)
uhp->uh_alt_prev.ptr->uh_alt_next.ptr = NULL;
next = uhp;
while (next != NULL)
{
tofree = next;
if (tofree->uh_alt_next.ptr != NULL)
u_freebranch(buf, tofree->uh_alt_next.ptr, uhpp); /* recursive */
next = tofree->uh_prev.ptr;
u_freeentries(buf, tofree, uhpp);
}
}
/*
* Free all the undo entries for one header and the header itself.
* This means that "uhp" is invalid when returning.
*/
static void
u_freeentries(
buf_T *buf,
u_header_T *uhp,
u_header_T **uhpp) /* if not NULL reset when freeing this header */
{
u_entry_T *uep, *nuep;
/* Check for pointers to the header that become invalid now. */
if (buf->b_u_curhead == uhp)
buf->b_u_curhead = NULL;
if (buf->b_u_newhead == uhp)
buf->b_u_newhead = NULL; /* freeing the newest entry */
if (uhpp != NULL && uhp == *uhpp)
*uhpp = NULL;
for (uep = uhp->uh_entry; uep != NULL; uep = nuep)
{
nuep = uep->ue_next;
u_freeentry(uep, uep->ue_size);
}
#ifdef U_DEBUG
uhp->uh_magic = 0;
#endif
vim_free((char_u *)uhp);
--buf->b_u_numhead;
}
/*
* free entry 'uep' and 'n' lines in uep->ue_array[]
*/
static void
u_freeentry(u_entry_T *uep, long n)
{
while (n > 0)
vim_free(uep->ue_array[--n]);
vim_free((char_u *)uep->ue_array);
#ifdef U_DEBUG
uep->ue_magic = 0;
#endif
vim_free((char_u *)uep);
}
/*
* invalidate the undo buffer; called when storage has already been released
*/
void
u_clearall(buf_T *buf)
{
buf->b_u_newhead = buf->b_u_oldhead = buf->b_u_curhead = NULL;
buf->b_u_synced = TRUE;
buf->b_u_numhead = 0;
buf->b_u_line_ptr = NULL;
buf->b_u_line_lnum = 0;
}
/*
* save the line "lnum" for the "U" command
*/
void
u_saveline(linenr_T lnum)
{
if (lnum == curbuf->b_u_line_lnum) /* line is already saved */
return;
if (lnum < 1 || lnum > curbuf->b_ml.ml_line_count) /* should never happen */
return;
u_clearline();
curbuf->b_u_line_lnum = lnum;
if (curwin->w_cursor.lnum == lnum)
curbuf->b_u_line_colnr = curwin->w_cursor.col;
else
curbuf->b_u_line_colnr = 0;
if ((curbuf->b_u_line_ptr = u_save_line(lnum)) == NULL)
do_outofmem_msg((long_u)0);
}
/*
* clear the line saved for the "U" command
* (this is used externally for crossing a line while in insert mode)
*/
void
u_clearline(void)
{
if (curbuf->b_u_line_ptr != NULL)
{
vim_free(curbuf->b_u_line_ptr);
curbuf->b_u_line_ptr = NULL;
curbuf->b_u_line_lnum = 0;
}
}
/*
* Implementation of the "U" command.
* Differentiation from vi: "U" can be undone with the next "U".
* We also allow the cursor to be in another line.
* Careful: may trigger autocommands that reload the buffer.
*/
void
u_undoline(void)
{
colnr_T t;
char_u *oldp;
if (undo_off)
return;
if (curbuf->b_u_line_ptr == NULL
|| curbuf->b_u_line_lnum > curbuf->b_ml.ml_line_count)
{
beep_flush();
return;
}
/* first save the line for the 'u' command */
if (u_savecommon(curbuf->b_u_line_lnum - 1,
curbuf->b_u_line_lnum + 1, (linenr_T)0, FALSE) == FAIL)
return;
oldp = u_save_line(curbuf->b_u_line_lnum);
if (oldp == NULL)
{
do_outofmem_msg((long_u)0);
return;
}
ml_replace(curbuf->b_u_line_lnum, curbuf->b_u_line_ptr, TRUE);
changed_bytes(curbuf->b_u_line_lnum, 0);
vim_free(curbuf->b_u_line_ptr);
curbuf->b_u_line_ptr = oldp;
t = curbuf->b_u_line_colnr;
if (curwin->w_cursor.lnum == curbuf->b_u_line_lnum)
curbuf->b_u_line_colnr = curwin->w_cursor.col;
curwin->w_cursor.col = t;
curwin->w_cursor.lnum = curbuf->b_u_line_lnum;
check_cursor_col();
}
/*
* Free all allocated memory blocks for the buffer 'buf'.
*/
void
u_blockfree(buf_T *buf)
{
while (buf->b_u_oldhead != NULL)
u_freeheader(buf, buf->b_u_oldhead, NULL);
vim_free(buf->b_u_line_ptr);
}
/*
* u_save_line(): allocate memory and copy line 'lnum' into it.
* Returns NULL when out of memory.
*/
static char_u *
u_save_line(linenr_T lnum)
{
return vim_strsave(ml_get(lnum));
}
/*
* Check if the 'modified' flag is set, or 'ff' has changed (only need to
* check the first character, because it can only be "dos", "unix" or "mac").
* "nofile" and "scratch" type buffers are considered to always be unchanged.
*/
int
bufIsChanged(buf_T *buf)
{
return
#ifdef FEAT_QUICKFIX
!bt_dontwrite(buf) &&
#endif
(buf->b_changed || file_ff_differs(buf, TRUE));
}
int
curbufIsChanged(void)
{
return
#ifdef FEAT_QUICKFIX
!bt_dontwrite(curbuf) &&
#endif
(curbuf->b_changed || file_ff_differs(curbuf, TRUE));
}
#if defined(FEAT_EVAL) || defined(PROTO)
/*
* For undotree(): Append the list of undo blocks at "first_uhp" to "list".
* Recursive.
*/
void
u_eval_tree(u_header_T *first_uhp, list_T *list)
{
u_header_T *uhp = first_uhp;
dict_T *dict;
while (uhp != NULL)
{
dict = dict_alloc();
if (dict == NULL)
return;
dict_add_nr_str(dict, "seq", uhp->uh_seq, NULL);
dict_add_nr_str(dict, "time", (long)uhp->uh_time, NULL);
if (uhp == curbuf->b_u_newhead)
dict_add_nr_str(dict, "newhead", 1, NULL);
if (uhp == curbuf->b_u_curhead)
dict_add_nr_str(dict, "curhead", 1, NULL);
if (uhp->uh_save_nr > 0)
dict_add_nr_str(dict, "save", uhp->uh_save_nr, NULL);
if (uhp->uh_alt_next.ptr != NULL)
{
list_T *alt_list = list_alloc();
if (alt_list != NULL)
{
/* Recursive call to add alternate undo tree. */
u_eval_tree(uhp->uh_alt_next.ptr, alt_list);
dict_add_list(dict, "alt", alt_list);
}
}
list_append_dict(list, dict);
uhp = uhp->uh_prev.ptr;
}
}
#endif