source: trunk/essentials/sys-apps/gawk/missing_d/strchr.c

/*
 * strchr --- search a string for a character
 *
 * We supply this routine for those systems that aren't standard yet.
 */

#if 0
#include <stdio.h>
#endif

char *
strchr(str, c)
register const char *str, c;
{
        if (c == '\0') {
                /* thanks to Mike Brennan ... */
                do {
                        if (*str == c)
                                return (char *) str;
                } while (*str++);
        } else {
                for (; *str; str++)
                        if (*str == c)
                                return (char *) str;
        }

        return NULL;
}

/*
 * strrchr --- find the last occurrence of a character in a string
 *
 * We supply this routine for those systems that aren't standard yet.
 */

char *
strrchr(str, c)
register const char *str, c;
{
        register const char *save = NULL;

        for (; *str; str++)
                if (*str == c)
                        save = str;

        return (char *) save;
}