NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | BUGS | SEE ALSO | COLOPHON

MEMMEM(3)                 Linux Programmer's Manual                MEMMEM(3)

NAME         top

       memmem - locate a substring

SYNOPSIS         top

       #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         top

       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         top

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

ATTRIBUTES         top

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

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

CONFORMING TO         top

       This function is not specified in POSIX.1, but is present on a number
       of other systems.

BUGS         top

       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         top

       bstring(3), strstr(3)

COLOPHON         top

       This page is part of release 4.10 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

GNU                              2017-03-13                        MEMMEM(3)