MEMMEM(3) | Library Functions Manual | MEMMEM(3)

# 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 is not currently standardized. However, it is meant to be API compatible with functions in FreeBSD and Linux.

# HISTORY

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

March 12, 2005 | NetBSD 9.2