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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)
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Linux man-pages 6.9.1 2024-05-02 memmem(3)
Pages that refer to this page: bstring(3), memchr(3), strstr(3)