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MEMMEM(3) Library Functions Manual MEMMEM(3) NAME memmem -- locate a byte substring in a byte string LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <string.h> void * memmem(const void *big, size_t big_len, const void *little, size_t little_len); DESCRIPTION The memmem() function locates the first occurrence of the byte string little in the byte string big. RETURN VALUES If little_len is zero big is returned (that is, an empty little is deemed to match at the beginning of big); if little occurs nowhere in big, NULL is returned; otherwise a pointer to the first character of the first occur- rence of little is returned. SEE ALSO memchr(3), strchr(3), strstr(3) STANDARDS memmem() conforms to IEEE Std 1003.1-2024 ("POSIX.1"). HISTORY The memmem() function first appeared in FreeBSD 6.0. It was replaced with an optimized O(n) implementation from the musl libc project in FreeBSD 12.0. Pascal Gloor <pascal.gloor@spale.com> provided this man page along with the previous implementation. BUGS This function was broken in Linux libc up to and including version 5.0.9 and in GNU libc prior to version 2.1. Prior to FreeBSD 11.0 memmem re- turned NULL when little_len equals 0. FreeBSD ports 15.quarterly June 29, 2023 MEMMEM(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS | HISTORY | BUGS
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