NAME

       memmem - locate a substring

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #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);

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

       For an explanation of the terms used in this section, see attributes(7).

       ┌──────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                                     │ Attribute     │ Value   │
       ├──────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │memmem()                                                                      │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       None.

HISTORY

       musl libc 0.9.7; FreeBSD 6.0, OpenBSD 5.4, NetBSD, Illumos.

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

       bstring(3), strstr(3)