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/memmem.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 src/string/mem/memmem.c (limited to 'src/string/mem/memmem.c') diff --git a/src/string/mem/memmem.c b/src/string/mem/memmem.c new file mode 100644 index 0000000..62739d4 --- /dev/null +++ b/src/string/mem/memmem.c @@ -0,0 +1,52 @@ +/** + * 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 +#include +#include + + +# pragma GCC diagnostic ignored "-Wdiscarded-qualifiers" + + + +/** + * Finds the first occurrence of a substring. + * This search is case sensitive. + * + * This is a GNU-compliant slibc extension. It was useful + * in implementing slibc itself. + * + * @param haystack The string to search. + * @param haystack_length The number of character to search. + * @param needle The sought after substring. + * @param needle_length The length of `needle`. + * @return Pointer to the first occurrence of + * the substring, `NULL` if not found. + */ +void* (memmem)(const void* __haystack, size_t haystack_length, + const void* __needle, size_t needle_length) +{ + const char* haystack = __haystack; + const char* needle = __needle; + if (haystack_length < needle_length) + return NULL; + if (haystack_length == needle_length) + return !(memcmp)(haystack, needle, haystack_length) ? haystack : NULL; +#include "substring.h" +} + -- cgit v1.2.3-70-g09d2