memmem

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



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

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

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

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)

COLOPHON
       This page is part of release 5.13 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                                2021-03-22                          MEMMEM(3)