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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | BUGS | SEE ALSO | COLOPHON |
MEMMEM(3) Linux Programmer's Manual MEMMEM(3)
memmem - locate a substring
#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);
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.
The memmem() function returns a pointer to the beginning of the
substring, or NULL if the substring is not found.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────┼───────────────┼─────────┤
│memmem() │ Thread safety │ MT-Safe │
└──────────┴───────────────┴─────────┘
This function is not specified in POSIX.1, but is present on a number
of other systems.
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.
bstring(3), strstr(3)
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GNU 2017-03-13 MEMMEM(3)
Pages that refer to this page: bstring(3) , memchr(3) , memrchr(3) , rawmemchr(3) , strcasestr(3) , strstr(3)
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