[hackers] [scc] [libc] Add strrchr() || Roberto E. Vargas Caballero

[git]

commit 008332b425b189c60ecff4e8a2d9096e3b7aa62b
Author:     Roberto E. Vargas Caballero <k...@shike2.com>
AuthorDate: Thu Feb 16 21:24:06 2017 +0100
Commit:     Roberto E. Vargas Caballero <k...@shike2.com>
CommitDate: Thu Feb 16 21:24:06 2017 +0100

    [libc] Add strrchr()

diff --git a/libc/src/Makefile b/libc/src/Makefile
index 22d2301..43228ab 100644
--- 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
new file mode 100644
index 0000000..2f246d1
--- /dev/null
+++ 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;
+}