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/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* 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 <string.h>
/**
* Copy a memory segment to another, possibly overlapping, segment,
* stop when a NUL byte or a specified substring is encountered.
*
* This is a slibc extension added for completeness.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @param str The substring, ignored if `NULL`.
* @return `NULL` if `str` was not encountered, otherwise
* the position of `str` translated to `whither`,
* that is, the address of `whither` plus the
* number of copied characters; the address of
* one character passed the last written non-NUL
* character.
*
* @since Always.
*/
char* strstrmove(char* whither, const char* whence, const char* restrict str)
{
const char* stop = str == NULL ? NULL : strstr(whence, str);
size_t n = stop == NULL ? strlen(whence) : (size_t)(stop - whence);
char* r = stop == NULL ? NULL : (whither + n);
memmove(whither, whence, n);
whither[n] = 0;
return r;
}
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