1 files changed, 289 insertions, 0 deletions
diff --git a/contrib/libarchive/tar/subst.c b/contrib/libarchive/tar/subst.c
new file mode 100644
index 0000000..3982054
--- /dev/null
+++ b/contrib/libarchive/tar/subst.c
@@ -0,0 +1,289 @@
+/*-
+ * 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 HAVE_REGEX_H
+#include "bsdtar.h"
+
+#include <errno.h>
+#include <regex.h>
+#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, symlink: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;
+
+	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';
+
+	rule->global = 0;
+	rule->print = 0;
+	rule->symlink = 0;
+
+	while (*++end_pattern) {
+		switch (*end_pattern) {
+		case 'g':
+		case 'G':
+			rule->global = 1;
+			break;
+		case 'p':
+		case 'P':
+			rule->print = 1;
+			break;
+		case 's':
+		case 'S':
+			rule->symlink = 1;
+			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");
+	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");
+	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_only)
+{
+	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_only && !rule->symlink)
+			continue;
+		if (regexec(&rule->re, name, 10, matches, 0))
+			continue;
+
+		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_eo);
+				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 /* HAVE_REGEX_H */