Name
memmem - locate a substring Library
Standard C library ( libc ", " -lc ) Synopsis
"#define(7)_GNU_SOURCE" " /* See feature_test_macros */" #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). allbox; lbx lb lb | Interface | Attribute | Value |
T{ memmem() | T} | Thread safety | MT-Safe |
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.