scc

commit 008332b425b189c60ecff4e8a2d9096e3b7aa62b
parent c7de2f7e79a025d87a47e0835f57d8091752b27e
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Thu, 16 Feb 2017 21:24:06 +0100

[libc] Add strrchr()

Diffstat:
M
libc/src/Makefile
 | 
3
++-
A
libc/src/strrchr.c
 | 
15
+++++++++++++++

2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/libc/src/Makefile b/libc/src/Makefile
@@ -1,7 +1,8 @@
 # See LICENSE file for copyright and license details.
 .POSIX:
 
-LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o
+LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o \
+          strrchr.o
 
 all: libc.a
 
diff --git a/libc/src/strrchr.c b/libc/src/strrchr.c
@@ -0,0 +1,15 @@
+/* See LICENSE file for copyright and license details. */
+
+#include <string.h>
+
+char *
+strrchr(const char *s, int c)
+{
+	char *t;
+
+	for (t = (char *) s; *t; ++t)
+		/* nothing */;
+	while (t > s && *t != c)
+		--t;
+	return (*t == c) ? t : NULL;
+}