From c99cadbe02f659264cecb44c053d96383631147d Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Tue, 17 Nov 2015 05:50:23 +0100 Subject: rearrange files MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/string/mem/memcmove.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 src/string/mem/memcmove.c (limited to 'src/string/mem/memcmove.c') diff --git a/src/string/mem/memcmove.c b/src/string/mem/memcmove.c new file mode 100644 index 0000000..50ed1f9 --- /dev/null +++ b/src/string/mem/memcmove.c @@ -0,0 +1,47 @@ +/** + * 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 . + */ +#include + + + +/** + * 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; +} + -- cgit v1.2.3-70-g09d2