| /* sb.h - header file for string buffer manipulation routines |
| Copyright (C) 1994, 1995 Free Software Foundation, Inc. |
| |
| Written by Steve and Judy Chamberlain of Cygnus Support, |
| sac@cygnus.com |
| |
| This file is part of GAS, the GNU Assembler. |
| |
| GAS is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GAS is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GAS; see the file COPYING. If not, write to the Free |
| Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 02111-1307, USA. */ |
| |
| #ifndef SB_H |
| |
| #define SB_H |
| |
| #include <stdio.h> |
| #include "ansidecl.h" |
| |
| /* string blocks |
| |
| I had a couple of choices when deciding upon this data structure. |
| gas uses null terminated strings for all its internal work. This |
| often means that parts of the program that want to examine |
| substrings have to manipulate the data in the string to do the |
| right thing (a common operation is to single out a bit of text by |
| saving away the character after it, nulling it out, operating on |
| the substring and then replacing the character which was under the |
| null). This is a pain and I remember a load of problems that I had with |
| code in gas which almost got this right. Also, it's harder to grow and |
| allocate null terminated strings efficiently. |
| |
| Obstacks provide all the functionality needed, but are too |
| complicated, hence the sb. |
| |
| An sb is allocated by the caller, and is initialzed to point to an |
| sb_element. sb_elements are kept on a free lists, and used when |
| needed, replaced onto the free list when unused. |
| */ |
| |
| #define sb_max_power_two 30 /* don't allow strings more than |
| 2^sb_max_power_two long */ |
| /* structure of an sb */ |
| typedef struct sb |
| { |
| char *ptr; /* points to the current block. */ |
| int len; /* how much is used. */ |
| int pot; /* the maximum length is 1<<pot */ |
| struct le *item; |
| } |
| sb; |
| |
| /* Structure of the free list object of an sb */ |
| typedef struct le |
| { |
| struct le *next; |
| int size; |
| char data[1]; |
| } |
| sb_element; |
| |
| /* The free list */ |
| typedef struct |
| { |
| sb_element *size[sb_max_power_two]; |
| } sb_list_vector; |
| |
| extern int string_count[sb_max_power_two]; |
| |
| extern void sb_build PARAMS ((sb *, int)); |
| extern void sb_new PARAMS ((sb *)); |
| extern void sb_kill PARAMS ((sb *)); |
| extern void sb_add_sb PARAMS ((sb *, sb *)); |
| extern void sb_reset PARAMS ((sb *)); |
| extern void sb_add_char PARAMS ((sb *, int)); |
| extern void sb_add_string PARAMS ((sb *, const char *)); |
| extern void sb_add_buffer PARAMS ((sb *, const char *, int)); |
| extern void sb_print PARAMS ((FILE *, sb *)); |
| extern void sb_print_at PARAMS ((FILE *, int, sb *)); |
| extern char *sb_name PARAMS ((sb *)); |
| extern char *sb_terminate PARAMS ((sb *)); |
| extern int sb_skip_white PARAMS ((int, sb *)); |
| extern int sb_skip_comma PARAMS ((int, sb *)); |
| |
| /* Actually in input-scrub.c. */ |
| extern void input_scrub_include_sb PARAMS ((sb *, char *)); |
| |
| #endif /* SB_H */ |