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/*
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 "includes.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;
ssize_t ls, lp, li, i;
if (!insert || !pattern || !*pattern || !s)
return;
ls = (ssize_t)strlen(s);
lp = (ssize_t)strlen(pattern);
li = (ssize_t)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) {
DEBUG(0,("ERROR: string overflow by "
"%d in string_sub(%.50s, %d)\n",
(int)(ls + (li-lp) - len),
pattern, (int)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;
}
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;
}
default:
p[i] = insert[i];
}
}
s = p + li;
ls += (li-lp);
if (replace_once)
break;
}
}
void string_sub_once(char *s, const char *pattern,
const char *insert, size_t len)
{
string_sub2( s, pattern, insert, len, true, true, false );
}
void string_sub(char *s,const char *pattern, const char *insert, size_t len)
{
string_sub2( s, pattern, insert, len, true, false, false );
}
/**
* Talloc'ed version of string_sub
*/
_PUBLIC_ char *string_sub_talloc(TALLOC_CTX *mem_ctx, const char *s,
const char *pattern, const char *insert)
{
const char *p;
char *ret;
size_t len, alloc_len;
if (insert == NULL || pattern == NULL || !*pattern || s == NULL)
return NULL;
/* determine length needed */
len = strlen(s);
for (p = strstr(s, pattern); p != NULL;
p = strstr(p+strlen(pattern), pattern)) {
len += strlen(insert) - strlen(pattern);
}
alloc_len = MAX(len, strlen(s))+1;
ret = talloc_array(mem_ctx, char, alloc_len);
if (ret == NULL)
return NULL;
strncpy(ret, s, alloc_len);
string_sub(ret, pattern, insert, alloc_len);
ret = talloc_realloc(mem_ctx, ret, char, len+1);
if (ret == NULL)
return NULL;
SMB_ASSERT(ret[len] == '\0');
talloc_set_name_const(ret, ret);
return ret;
}
/**
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;
ssize_t ls,lp,li;
if (!insert || !pattern || !s)
return;
ls = (ssize_t)strlen(s);
lp = (ssize_t)strlen(pattern);
li = (ssize_t)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) {
DEBUG(0,("ERROR: string overflow by "
"%d in all_string_sub(%.50s, %d)\n",
(int)(ls + (li-lp) - len),
pattern, (int)len));
break;
}
if (li != lp) {
memmove(p+li,p+lp,strlen(p+lp)+1);
}
memcpy(p, insert, li);
s = p + li;
ls += (li-lp);
}
}
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