Plan 9 from Bell Labs’s /usr/web/sources/nix/nix/sys/src/libc/port/memchr.c
#include <u.h> #include <libc.h> void* memchr(void *ap, int c, ulong n) { uchar *sp; sp = ap; c &= 0xFF; while(n > 0) { if(*sp++ == c) return sp-1; n--; } return 0; }