source: buchla-68k/libsm/memchr.c

/*
   =============================================================================
        memchr.c -- search a string for a character
        Version 1 -- 1987-06-12

        Return the ptr in vp at which the character c appears;
        NULL if not found in n chars; don't stop at \0.
   =============================================================================
*/

#include "ram.h"

void *memchr(void *vp, int8_t c, int16_t n)
{
        int8_t *cp = vp;

        while (--n >= 0)
                if (*cp++ == c)
                        return(--cp);

        return((void *)0);
}