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 |
This function is not specified in POSIX.1, but is present on a number of other
systems, including: musl libc 0.9.7; FreeBSD 6.0, OpenBSD 5.4, NetBSD, and
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.
bstring(3),
strstr(3)