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-rw-r--r--lib/util/substitute.c280
1 files changed, 280 insertions, 0 deletions
diff --git a/lib/util/substitute.c b/lib/util/substitute.c
new file mode 100644
index 0000000..b7b5588
--- /dev/null
+++ b/lib/util/substitute.c
@@ -0,0 +1,280 @@
+/*
+ Unix SMB/CIFS implementation.
+ Samba utility functions
+
+ Copyright (C) Andrew Tridgell 1992-2001
+ Copyright (C) Simo Sorce 2001-2002
+ Copyright (C) Martin Pool 2003
+ Copyright (C) James Peach 2005
+
+ This program 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 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "debug.h"
+#ifndef SAMBA_UTIL_CORE_ONLY
+#include "charset/charset.h"
+#else
+#include "charset_compat.h"
+#endif
+#include "substitute.h"
+
+/**
+ * @file
+ * @brief Substitute utilities.
+ **/
+
+/**
+ Substitute a string for a pattern in another string. Make sure there is
+ enough room!
+
+ This routine looks for pattern in s and replaces it with
+ insert. It may do multiple replacements or just one.
+
+ Any of " ; ' $ or ` in the insert string are replaced with _
+ if len==0 then the string cannot be extended. This is different from the old
+ use of len==0 which was for no length checks to be done.
+**/
+
+static void string_sub2(char *s,const char *pattern, const char *insert, size_t len,
+ bool remove_unsafe_characters, bool replace_once,
+ bool allow_trailing_dollar)
+{
+ char *p;
+ size_t ls, lp, li, i;
+
+ if (!insert || !pattern || !*pattern || !s)
+ return;
+
+ ls = strlen(s);
+ lp = strlen(pattern);
+ li = strlen(insert);
+
+ if (len == 0)
+ len = ls + 1; /* len is number of *bytes* */
+
+ while (lp <= ls && (p = strstr_m(s,pattern))) {
+ if (ls + li - lp >= len) {
+ DBG_ERR("ERROR: string overflow by "
+ "%zu in string_sub(%.50s, %zu)\n",
+ ls + li - lp + 1 - len,
+ pattern,
+ len);
+ break;
+ }
+ if (li != lp) {
+ memmove(p+li,p+lp,strlen(p+lp)+1);
+ }
+ for (i=0;i<li;i++) {
+ switch (insert[i]) {
+ case '$':
+ /* allow a trailing $
+ * (as in machine accounts) */
+ if (allow_trailing_dollar && (i == li - 1 )) {
+ p[i] = insert[i];
+ break;
+ }
+ FALL_THROUGH;
+ case '`':
+ case '"':
+ case '\'':
+ case ';':
+ case '%':
+ case '\r':
+ case '\n':
+ if ( remove_unsafe_characters ) {
+ p[i] = '_';
+ /* yes this break should be here
+ * since we want to fall throw if
+ * not replacing unsafe chars */
+ break;
+ }
+ FALL_THROUGH;
+ default:
+ p[i] = insert[i];
+ }
+ }
+ s = p + li;
+ ls = ls + li - lp;
+
+ if (replace_once)
+ break;
+ }
+}
+
+void string_sub(char *s,const char *pattern, const char *insert, size_t len)
+{
+ string_sub2( s, pattern, insert, len, true, false, false );
+}
+
+/**
+ Similar to string_sub() but allows for any character to be substituted.
+ Use with caution!
+ if len==0 then the string cannot be extended. This is different from the old
+ use of len==0 which was for no length checks to be done.
+**/
+
+_PUBLIC_ void all_string_sub(char *s,const char *pattern,const char *insert, size_t len)
+{
+ char *p;
+ size_t ls,lp,li;
+
+ if (!insert || !pattern || !s)
+ return;
+
+ ls = strlen(s);
+ lp = strlen(pattern);
+ li = strlen(insert);
+
+ if (!*pattern)
+ return;
+
+ if (len == 0)
+ len = ls + 1; /* len is number of *bytes* */
+
+ while (lp <= ls && (p = strstr_m(s,pattern))) {
+ if (ls + li - lp >= len) {
+ DBG_ERR("ERROR: string overflow by "
+ "%zu in all_string_sub(%.50s, %zu)\n",
+ ls + li - lp + 1 - len,
+ pattern,
+ len);
+ break;
+ }
+ if (li != lp) {
+ memmove(p+li,p+lp,strlen(p+lp)+1);
+ }
+ memcpy(p, insert, li);
+ s = p + li;
+ ls = ls + li - lp;
+ }
+}
+
+/*
+ * Internal guts of talloc_string_sub and talloc_all_string_sub.
+ * talloc version of string_sub2.
+ */
+
+char *talloc_string_sub2(TALLOC_CTX *mem_ctx, const char *src,
+ const char *pattern,
+ const char *insert,
+ bool remove_unsafe_characters,
+ bool replace_once,
+ bool allow_trailing_dollar)
+{
+ char *p, *in;
+ char *s;
+ char *string;
+ ssize_t ls,lp,li,ld, i;
+
+ if (!insert || !pattern || !*pattern || !src) {
+ return NULL;
+ }
+
+ string = talloc_strdup(mem_ctx, src);
+ if (string == NULL) {
+ DEBUG(0, ("talloc_string_sub2: "
+ "talloc_strdup failed\n"));
+ return NULL;
+ }
+
+ s = string;
+
+ in = talloc_strdup(mem_ctx, insert);
+ if (!in) {
+ DEBUG(0, ("talloc_string_sub2: ENOMEM\n"));
+ talloc_free(string);
+ return NULL;
+ }
+ ls = (ssize_t)strlen(s);
+ lp = (ssize_t)strlen(pattern);
+ li = (ssize_t)strlen(insert);
+ ld = li - lp;
+
+ for (i=0;i<li;i++) {
+ switch (in[i]) {
+ case '$':
+ /* allow a trailing $
+ * (as in machine accounts) */
+ if (allow_trailing_dollar && (i == li - 1 )) {
+ break;
+ }
+
+ FALL_THROUGH;
+ case '`':
+ case '"':
+ case '\'':
+ case ';':
+ case '%':
+ case '\r':
+ case '\n':
+ if (remove_unsafe_characters) {
+ in[i] = '_';
+ break;
+ }
+
+ FALL_THROUGH;
+ default:
+ /* ok */
+ break;
+ }
+ }
+
+ while ((p = strstr_m(s,pattern))) {
+ if (ld > 0) {
+ int offset = PTR_DIFF(s,string);
+ string = (char *)talloc_realloc_size(mem_ctx, string,
+ ls + ld + 1);
+ if (!string) {
+ DEBUG(0, ("talloc_string_sub: out of "
+ "memory!\n"));
+ TALLOC_FREE(in);
+ return NULL;
+ }
+ p = string + offset + (p - s);
+ }
+ if (li != lp) {
+ memmove(p+li,p+lp,strlen(p+lp)+1);
+ }
+ memcpy(p, in, li);
+ s = p + li;
+ ls += ld;
+
+ if (replace_once) {
+ break;
+ }
+ }
+ TALLOC_FREE(in);
+ return string;
+}
+
+/* Same as string_sub, but returns a talloc'ed string */
+
+char *talloc_string_sub(TALLOC_CTX *mem_ctx,
+ const char *src,
+ const char *pattern,
+ const char *insert)
+{
+ return talloc_string_sub2(mem_ctx, src, pattern, insert,
+ true, false, false);
+}
+
+char *talloc_all_string_sub(TALLOC_CTX *ctx,
+ const char *src,
+ const char *pattern,
+ const char *insert)
+{
+ return talloc_string_sub2(ctx, src, pattern, insert,
+ false, false, false);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-09 17:57:44 +0000