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MEMCHR(3) FreeBSD Library Functions Manual MEMCHR(3) NAME memchr - locate byte in byte string LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <string.h> void * memchr(const void *b, int c, size_t len); void * memrchr(const void *b, int c, size_t len); DESCRIPTION The memchr() function locates the first occurrence of c (converted to an unsigned char) in string b. The memrchr() function behaves like memchr(), except that it locates the last occurrence of c in string b. RETURN VALUES The memchr() and memrchr() functions return a pointer to the byte located, or NULL if no such byte exists within len bytes. SEE ALSO memmem(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3), wmemchr(3) STANDARDS The memchr() function conforms to ISO/IEC 9899:1990 ("ISO C90"). The memrchr() function is a GNU extension and conforms to no standard. HISTORY The memrchr() function first appeared in GNU libc 2.1.91, this implementation first appeared in FreeBSD 6.4, coming from OpenBSD 4.3. FreeBSD 14.0-RELEASE-p11 April 9, 2008 FreeBSD 14.0-RELEASE-p11