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65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/* Copyright (C) 2010-2015 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (stdstring.c).
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* ---------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <string/stdstring.h>
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char *string_replace_substring(const char *in, const char *pattern, const char *by)
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{
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char *needle = NULL, *res = NULL;
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size_t outsize = 0;
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size_t resoffset = 0;
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if (!in)
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return NULL;
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outsize = strlen(in) + 1;
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/* TODO maybe avoid reallocating by counting the
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* non-overlapping occurences of pattern */
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res = (char*)malloc(outsize);
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if (!res)
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return NULL;
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while ((needle = strstr(in, pattern)))
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{
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/* copy everything up to the pattern */
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memcpy(res + resoffset, in, needle - in);
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resoffset += needle - in;
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/* skip the pattern in the input-string */
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in = needle + strlen(pattern);
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/* adjust space for replacement */
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outsize = outsize - strlen(pattern) + strlen(by);
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res = realloc(res, outsize);
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/* copy the pattern */
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memcpy(res + resoffset, by, strlen(by));
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resoffset += strlen(by);
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}
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/* copy the remaining input */
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strcpy(res + resoffset, in);
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return res;
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}
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