strchr.c   [plain text]

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

#include <stdio.h>

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;
}