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 sub-
 string, or NULL if the substring is not found.
ATTRIBUTES
 For an explanation of the terms used in this section, see at-
 tributes(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 5.10 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年03月13日 MEMMEM(3)