memmem - locate a substring
#define _GNU_SOURCE /* See feature_test_macros(7) */
#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.
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.
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.
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