tar/subst.c - third_party/libarchive - Git at Google

 /*-
  * Copyright (c) 2008 Joerg Sonnenberger
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "bsdtar_platform.h"
 __FBSDID("$FreeBSD: src/usr.bin/tar/subst.c,v 1.4 2008/06/15 10:08:16 kientzle Exp $");

 #if defined(HAVE_REGEX_H) || defined(HAVE_PCREPOSIX_H)
 #include "bsdtar.h"

 #include <errno.h>
 #ifdef HAVE_PCREPOSIX_H
 #include <pcreposix.h>
 #else
 #include <regex.h>
 #endif
 #include <stdlib.h>
 #include <string.h>

 #ifndef REG_BASIC
 #define	REG_BASIC 0
 #endif

 #include "err.h"

 struct subst_rule {
 	struct subst_rule *next;
 	regex_t re;
 	char *result;
 	unsigned int global:1, print:1, regular:1, symlink:1, hardlink:1;
 };

 struct substitution {
 	struct subst_rule *first_rule, *last_rule;
 };

 static void
 init_substitution(struct bsdtar *bsdtar)
 {
 	struct substitution *subst;

 	bsdtar->substitution = subst = malloc(sizeof(*subst));
 	if (subst == NULL)
 		lafe_errc(1, errno, "Out of memory");
 	subst->first_rule = subst->last_rule = NULL;
 }

 void
 add_substitution(struct bsdtar *bsdtar, const char *rule_text)
 {
 	struct subst_rule *rule;
 	struct substitution *subst;
 	const char *end_pattern, *start_subst;
 	char *pattern;
 	int r;

 	if ((subst = bsdtar->substitution) == NULL) {
 		init_substitution(bsdtar);
 		subst = bsdtar->substitution;
 	}

 	rule = malloc(sizeof(*rule));
 	if (rule == NULL)
 		lafe_errc(1, errno, "Out of memory");
 	rule->next = NULL;
 	rule->result = NULL;

 	if (subst->last_rule == NULL)
 		subst->first_rule = rule;
 	else
 		subst->last_rule->next = rule;
 	subst->last_rule = rule;

 	if (*rule_text == '\0')
 		lafe_errc(1, 0, "Empty replacement string");
 	end_pattern = strchr(rule_text + 1, *rule_text);
 	if (end_pattern == NULL)
 		lafe_errc(1, 0, "Invalid replacement string");

 	pattern = malloc(end_pattern - rule_text);
 	if (pattern == NULL)
 		lafe_errc(1, errno, "Out of memory");
 	memcpy(pattern, rule_text + 1, end_pattern - rule_text - 1);
 	pattern[end_pattern - rule_text - 1] = '\0';

 	if ((r = regcomp(&rule->re, pattern, REG_BASIC)) != 0) {
 		char buf[80];
 		regerror(r, &rule->re, buf, sizeof(buf));
 		lafe_errc(1, 0, "Invalid regular expression: %s", buf);
 	}
 	free(pattern);

 	start_subst = end_pattern + 1;
 	end_pattern = strchr(start_subst, *rule_text);
 	if (end_pattern == NULL)
 		lafe_errc(1, 0, "Invalid replacement string");

 	rule->result = malloc(end_pattern - start_subst + 1);
 	if (rule->result == NULL)
 		lafe_errc(1, errno, "Out of memory");
 	memcpy(rule->result, start_subst, end_pattern - start_subst);
 	rule->result[end_pattern - start_subst] = '\0';

 	/* Defaults */
 	rule->global = 0; /* Don't do multiple replacements. */
 	rule->print = 0; /* Don't print. */
 	rule->regular = 1; /* Rewrite regular filenames. */
 	rule->symlink = 1; /* Rewrite symlink targets. */
 	rule->hardlink = 1; /* Rewrite hardlink targets. */

 	while (*++end_pattern) {
 		switch (*end_pattern) {
 		case 'g':
 		case 'G':
 			rule->global = 1;
 			break;
 		case 'h':
 			rule->hardlink = 1;
 			break;
 		case 'H':
 			rule->hardlink = 0;
 			break;
 		case 'p':
 		case 'P':
 			rule->print = 1;
 			break;
 		case 'r':
 			rule->regular = 1;
 			break;
 		case 'R':
 			rule->regular = 0;
 			break;
 		case 's':
 			rule->symlink = 1;
 			break;
 		case 'S':
 			rule->symlink = 0;
 			break;
 		default:
 			lafe_errc(1, 0, "Invalid replacement flag %c", *end_pattern);
 		}
 	}
 }

 static void
 realloc_strncat(char **str, const char *append, size_t len)
 {
 	char *new_str;
 	size_t old_len;

 	if (*str == NULL)
 		old_len = 0;
 	else
 		old_len = strlen(*str);

 	new_str = malloc(old_len + len + 1);
 	if (new_str == NULL)
 		lafe_errc(1, errno, "Out of memory");
 	if (*str != NULL)
 		memcpy(new_str, *str, old_len);
 	memcpy(new_str + old_len, append, len);
 	new_str[old_len + len] = '\0';
 	free(*str);
 	*str = new_str;
 }

 static void
 realloc_strcat(char **str, const char *append)
 {
 	char *new_str;
 	size_t old_len;

 	if (*str == NULL)
 		old_len = 0;
 	else
 		old_len = strlen(*str);

 	new_str = malloc(old_len + strlen(append) + 1);
 	if (new_str == NULL)
 		lafe_errc(1, errno, "Out of memory");
 	if (*str != NULL)
 		memcpy(new_str, *str, old_len);
 	strcpy(new_str + old_len, append);
 	free(*str);
 	*str = new_str;
 }

 int
 apply_substitution(struct bsdtar *bsdtar, const char *name, char **result,
     int symlink_target, int hardlink_target)
 {
 	const char *path = name;
 	regmatch_t matches[10];
 	size_t i, j;
 	struct subst_rule *rule;
 	struct substitution *subst;
 	int c, got_match, print_match;

 	*result = NULL;

 	if ((subst = bsdtar->substitution) == NULL)
 		return 0;

 	got_match = 0;
 	print_match = 0;

 	for (rule = subst->first_rule; rule != NULL; rule = rule->next) {
 		if (symlink_target) {
 			if (!rule->symlink)
 				continue;
 		} else if (hardlink_target) {
 			if (!rule->hardlink)
 				continue;
 		} else { /* Regular filename. */
 			if (!rule->regular)
 				continue;
 		}

 		while (1) {
 			if (regexec(&rule->re, name, 10, matches, 0))
 				break;

 			got_match = 1;
 			print_match |= rule->print;
 			realloc_strncat(result, name, matches[0].rm_so);

 			for (i = 0, j = 0; rule->result[i] != '\0'; ++i) {
 				if (rule->result[i] == '~') {
 					realloc_strncat(result, rule->result + j, i - j);
 					realloc_strncat(result,
 					    name + matches[0].rm_so,
 					    matches[0].rm_eo - matches[0].rm_so);
 					j = i + 1;
 					continue;
 				}
 				if (rule->result[i] != '\\')
 					continue;

 				++i;
 				c = rule->result[i];
 				switch (c) {
 				case '~':
 				case '\\':
 					realloc_strncat(result, rule->result + j, i - j - 1);
 					j = i;
 					break;
 				case '1':
 				case '2':
 				case '3':
 				case '4':
 				case '5':
 				case '6':
 				case '7':
 				case '8':
 				case '9':
 					realloc_strncat(result, rule->result + j, i - j - 1);
 					if ((size_t)(c - '0') > (size_t)(rule->re.re_nsub)) {
 						free(*result);
 						*result = NULL;
 						return -1;
 					}
 					realloc_strncat(result, name + matches[c - '0'].rm_so, matches[c - '0'].rm_eo - matches[c - '0'].rm_so);
 					j = i + 1;
 					break;
 				default:
 					/* Just continue; */
 					break;
 				}

 			}

 			realloc_strcat(result, rule->result + j);

 			name += matches[0].rm_eo;

 			if (!rule->global)
 				break;
 		}
 	}

 	if (got_match)
 		realloc_strcat(result, name);

 	if (print_match)
 		fprintf(stderr, "%s >> %s\n", path, *result);

 	return got_match;
 }

 void
 cleanup_substitution(struct bsdtar *bsdtar)
 {
 	struct subst_rule *rule;
 	struct substitution *subst;

 	if ((subst = bsdtar->substitution) == NULL)
 		return;

 	while ((rule = subst->first_rule) != NULL) {
 		subst->first_rule = rule->next;
 		free(rule->result);
 		free(rule);
 	}
 	free(subst);
 }
 #endif /* defined(HAVE_REGEX_H) || defined(HAVE_PCREPOSIX_H) */
	/*-
	* Copyright (c) 2008 Joerg Sonnenberger
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "bsdtar_platform.h"
	__FBSDID("$FreeBSD: src/usr.bin/tar/subst.c,v 1.4 2008/06/15 10:08:16 kientzle Exp $");

	#if defined(HAVE_REGEX_H) \|\| defined(HAVE_PCREPOSIX_H)
	#include "bsdtar.h"

	#include <errno.h>
	#ifdef HAVE_PCREPOSIX_H
	#include <pcreposix.h>
	#else
	#include <regex.h>
	#endif
	#include <stdlib.h>
	#include <string.h>

	#ifndef REG_BASIC
	#define REG_BASIC 0
	#endif

	#include "err.h"

	struct subst_rule {
	struct subst_rule *next;
	regex_t re;
	char *result;
	unsigned int global:1, print:1, regular:1, symlink:1, hardlink:1;
	};

	struct substitution {
	struct subst_rule first_rule, last_rule;
	};

	static void
	init_substitution(struct bsdtar *bsdtar)
	{
	struct substitution *subst;

	bsdtar->substitution = subst = malloc(sizeof(*subst));
	if (subst == NULL)
	lafe_errc(1, errno, "Out of memory");
	subst->first_rule = subst->last_rule = NULL;
	}

	void
	add_substitution(struct bsdtar bsdtar, const char rule_text)
	{
	struct subst_rule *rule;
	struct substitution *subst;
	const char end_pattern, start_subst;
	char *pattern;
	int r;

	if ((subst = bsdtar->substitution) == NULL) {
	init_substitution(bsdtar);
	subst = bsdtar->substitution;
	}

	rule = malloc(sizeof(*rule));
	if (rule == NULL)
	lafe_errc(1, errno, "Out of memory");
	rule->next = NULL;
	rule->result = NULL;

	if (subst->last_rule == NULL)
	subst->first_rule = rule;
	else
	subst->last_rule->next = rule;
	subst->last_rule = rule;

	if (*rule_text == '\0')
	lafe_errc(1, 0, "Empty replacement string");
	end_pattern = strchr(rule_text + 1, *rule_text);
	if (end_pattern == NULL)
	lafe_errc(1, 0, "Invalid replacement string");

	pattern = malloc(end_pattern - rule_text);
	if (pattern == NULL)
	lafe_errc(1, errno, "Out of memory");
	memcpy(pattern, rule_text + 1, end_pattern - rule_text - 1);
	pattern[end_pattern - rule_text - 1] = '\0';

	if ((r = regcomp(&rule->re, pattern, REG_BASIC)) != 0) {
	char buf[80];
	regerror(r, &rule->re, buf, sizeof(buf));
	lafe_errc(1, 0, "Invalid regular expression: %s", buf);
	}
	free(pattern);

	start_subst = end_pattern + 1;
	end_pattern = strchr(start_subst, *rule_text);
	if (end_pattern == NULL)
	lafe_errc(1, 0, "Invalid replacement string");

	rule->result = malloc(end_pattern - start_subst + 1);
	if (rule->result == NULL)
	lafe_errc(1, errno, "Out of memory");
	memcpy(rule->result, start_subst, end_pattern - start_subst);
	rule->result[end_pattern - start_subst] = '\0';

	/* Defaults */
	rule->global = 0; /* Don't do multiple replacements. */
	rule->print = 0; /* Don't print. */
	rule->regular = 1; /* Rewrite regular filenames. */
	rule->symlink = 1; /* Rewrite symlink targets. */
	rule->hardlink = 1; /* Rewrite hardlink targets. */

	while (*++end_pattern) {
	switch (*end_pattern) {
	case 'g':
	case 'G':
	rule->global = 1;
	break;
	case 'h':
	rule->hardlink = 1;
	break;
	case 'H':
	rule->hardlink = 0;
	break;
	case 'p':
	case 'P':
	rule->print = 1;
	break;
	case 'r':
	rule->regular = 1;
	break;
	case 'R':
	rule->regular = 0;
	break;
	case 's':
	rule->symlink = 1;
	break;
	case 'S':
	rule->symlink = 0;
	break;
	default:
	lafe_errc(1, 0, "Invalid replacement flag %c", *end_pattern);
	}
	}
	}

	static void
	realloc_strncat(char *str, const char append, size_t len)
	{
	char *new_str;
	size_t old_len;

	if (*str == NULL)
	old_len = 0;
	else
	old_len = strlen(*str);

	new_str = malloc(old_len + len + 1);
	if (new_str == NULL)
	lafe_errc(1, errno, "Out of memory");
	if (*str != NULL)
	memcpy(new_str, *str, old_len);
	memcpy(new_str + old_len, append, len);
	new_str[old_len + len] = '\0';
	free(*str);
	*str = new_str;
	}

	static void
	realloc_strcat(char *str, const char append)
	{
	char *new_str;
	size_t old_len;

	if (*str == NULL)
	old_len = 0;
	else
	old_len = strlen(*str);

	new_str = malloc(old_len + strlen(append) + 1);
	if (new_str == NULL)
	lafe_errc(1, errno, "Out of memory");
	if (*str != NULL)
	memcpy(new_str, *str, old_len);
	strcpy(new_str + old_len, append);
	free(*str);
	*str = new_str;
	}

	int
	apply_substitution(struct bsdtar bsdtar, const char name, char **result,
	int symlink_target, int hardlink_target)
	{
	const char *path = name;
	regmatch_t matches[10];
	size_t i, j;
	struct subst_rule *rule;
	struct substitution *subst;
	int c, got_match, print_match;

	*result = NULL;

	if ((subst = bsdtar->substitution) == NULL)
	return 0;

	got_match = 0;
	print_match = 0;

	for (rule = subst->first_rule; rule != NULL; rule = rule->next) {
	if (symlink_target) {
	if (!rule->symlink)
	continue;
	} else if (hardlink_target) {
	if (!rule->hardlink)
	continue;
	} else { /* Regular filename. */
	if (!rule->regular)
	continue;
	}

	while (1) {
	if (regexec(&rule->re, name, 10, matches, 0))
	break;

	got_match = 1;
	print_match \|= rule->print;
	realloc_strncat(result, name, matches[0].rm_so);

	for (i = 0, j = 0; rule->result[i] != '\0'; ++i) {
	if (rule->result[i] == '~') {
	realloc_strncat(result, rule->result + j, i - j);
	realloc_strncat(result,
	name + matches[0].rm_so,
	matches[0].rm_eo - matches[0].rm_so);
	j = i + 1;
	continue;
	}
	if (rule->result[i] != '\\')
	continue;

	++i;
	c = rule->result[i];
	switch (c) {
	case '~':
	case '\\':
	realloc_strncat(result, rule->result + j, i - j - 1);
	j = i;
	break;
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
	case '8':
	case '9':
	realloc_strncat(result, rule->result + j, i - j - 1);
	if ((size_t)(c - '0') > (size_t)(rule->re.re_nsub)) {
	free(*result);
	*result = NULL;
	return -1;
	}
	realloc_strncat(result, name + matches[c - '0'].rm_so, matches[c - '0'].rm_eo - matches[c - '0'].rm_so);
	j = i + 1;
	break;
	default:
	/* Just continue; */
	break;
	}

	}

	realloc_strcat(result, rule->result + j);

	name += matches[0].rm_eo;

	if (!rule->global)
	break;
	}
	}

	if (got_match)
	realloc_strcat(result, name);

	if (print_match)
	fprintf(stderr, "%s >> %s\n", path, *result);

	return got_match;
	}

	void
	cleanup_substitution(struct bsdtar *bsdtar)
	{
	struct subst_rule *rule;
	struct substitution *subst;

	if ((subst = bsdtar->substitution) == NULL)
	return;

	while ((rule = subst->first_rule) != NULL) {
	subst->first_rule = rule->next;
	free(rule->result);
	free(rule);
	}
	free(subst);
	}
	#endif /* defined(HAVE_REGEX_H) \|\| defined(HAVE_PCREPOSIX_H) */