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Name

memmem - locate a substring

Synopsis


#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);

Description

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.

Return Value

The memmem() function returns a pointer to the beginning of the substring, or NULL if the substring is not found.

Attributes

Multithreading (see pthreads(7) )

The memmem() function is thread-safe.

Conforming to

This function is a GNU extension.

Bugs

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.

See Also

strstr(3)

Colophon

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