/** * 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 position 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. * * @since Always. */ 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; }