GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
Debian 6.0.3(Squeeze) |
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memmem(3) |
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memmem − locate a substring
#define
_GNU_SOURCE
#include <string.h>
void
*memmem(const void *haystack, size_t
haystacklen,
const void *needle, size_t
needlelen);
The memmem() function finds the start of the first occurrence of the substring needle of length needlelen in the memory area haystack of length haystacklen.
The memmem() function returns a pointer to the beginning of the substring, or NULL if the substring is not found.
This function is a GNU extension.
This function was broken in Linux libraries up to and including libc 5.0.9; there the needle and haystack arguments were interchanged, and a pointer to the end of the first occurrence of needle was returned.
Both old and new libc’s have the bug that if needle is empty, haystack−1 (instead of haystack) is returned. And glibc 2.0 makes it worse, returning a pointer to the last byte of haystack. This is fixed in glibc 2.1.
strstr(3), feature_test_macros(7)
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
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memmem(3) | |