memmem - locate a substring
Standard C library (libc, -lc)
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <string.h>
void *memmem(const void haystack[.haystacklen], size_t haystacklen,
const void needle[.needlelen], 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.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
memmem() |
Thread safety | MT-Safe |
None.
musl libc 0.9.7; FreeBSD 6.0, OpenBSD 5.4, NetBSD, Illumos.
In glibc 2.0, if needle is empty, memmem()
returns a pointer to the last byte of haystack. This is fixed
in glibc 2.1.