| memmem(3) | locate a substring |
| bstring, bcmp, bcopy, bzero, memccpy, memchr, memcmp, memcpy, memfrob, memmem, memmove, memset(3) | byte string operations |
| memmem(3) | Library Functions Manual | memmem(3) |
memmem - locate a substring
Standard C library (libc, -lc)
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <string.h>
void *memmem(const void haystack[.haystacklen], size_t haystacklen,
const void needle[.needlelen], 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 |
None.
musl libc 0.9.7; FreeBSD 6.0, OpenBSD 5.4, NetBSD, Illumos.
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)
| 2023-07-20 | Linux man-pages 6.05.01 |