NAME

memmem — locate substring in byte string

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <string.h>

void *
memmem(const void *block, size_t blen, const void *pat, size_t plen);

DESCRIPTION

The memmem() function locates the first occurrence of the binary string pat of size plen bytes in the byte string block of size blen bytes.

RETURN VALUES

The memmem() function returns a pointer to the substring located, or NULL if no such substring exists within block.

If plen is zero, block is returned, i.e. a zero length pat is deemed to match the start of the string, as with strstr(3).

SEE ALSO

bm(3), memchr(3), strchr(3), strstr(3)

STANDARDS

The memmem function conforms to IEEE Std 1003.1-2024 (“POSIX.1”).

HISTORY

memmem() first appeared in the Free Software Foundation's glibc library.