From 32da28619e84abb2da6e6088848b1fc9c66a9a6a Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Tue, 17 Nov 2015 03:58:53 +0100 Subject: split strstr.c and strchr.c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/string/memchr.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 src/string/memchr.c (limited to 'src/string/memchr.c') diff --git a/src/string/memchr.c b/src/string/memchr.c new file mode 100644 index 0000000..380fa0f --- /dev/null +++ b/src/string/memchr.c @@ -0,0 +1,42 @@ +/** + * 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 + + +# pragma GCC diagnostic ignored "-Wdiscarded-qualifiers" + + + +/** + * Find the first occurrence of a byte in a memory segment. + * + * @param segment The memory segment to search. + * @param c The sought after character. + * @param size The size of the memory segment. + * @return Pointer to the first occurrence of `c`, + * `NULL` if none were found. + */ +void* (memchr)(const void* segment, int c, size_t size) +{ + char* s = segment; + while (size--) + if (*s++ == c) + return s - 1; + return NULL; +} + -- cgit v1.2.3-70-g09d2