/**
* 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, non-overlapping, segment,
* but stop if a specific byte is encountered.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @param c The byte to stop at if encountered.
* @param size The maximum number of bytes to copy.
* @return `NULL` if `c` was not encountered, otherwise
* the possition of `c` translated to `whither`,
* that is, the address of `whither` plus the
* number of copied characters; the address of
* one character passed the last written character.
*/
void* memccpy(void* restrict whither, const void* restrict whence, int c, size_t size)
{
char* stop = memchr(whence, c, size);
void* r = NULL;
if (stop != NULL)
size = (size_t)(stop - (const char*)whence), r = whither + size;
memcpy(whither, whence, size);
return r;
}
/**
* Copy a memory segment to another, possibly overlapping, segment,
* but stop if a specific byte is encountered.
*
* This is a slibc extension added for completeness.
*
* @param whither The destination memory segment.
* @param whence The source memory segment.
* @param c The byte to stop at if encountered.
* @param size The maximum number of bytes to copy.
* @return `NULL` if `c` was not encountered, otherwise
* the possition of `c` translated to `whither`,
* that is, the address of `whither` plus the
* number of copied characters; the address of
* one character passed the last written character.
*/
void* memcmove(void* whither, const void* whence, int c, size_t size)
{
char* stop = memchr(whence, c, size);
void* r = NULL;
if (stop != NULL)
size = (size_t)(stop - (const char*)whence), r = whither + size;
memmove(whither, whence, size);
return r;
}
