scc

commit 5623808ee73aea1ceffcf3503def2ec3f4773e1a
parent 92efbe7e846d7326ffbe076a99fb682172039261
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Fri, 17 Feb 2017 08:47:08 +0100

[libc] Add memchr()

Diffstat:
M
libc/src/Makefile
 | 
2
+-
A
libc/src/memchr.c
 | 
13
+++++++++++++

2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/libc/src/Makefile b/libc/src/Makefile
@@ -3,7 +3,7 @@
 
 LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o \
           strrchr.o strcat.o strncpy.o strncat.o \
-          memset.o memcpy.o memmove.o memcmp.o
+          memset.o memcpy.o memmove.o memcmp.o memchr.o
 
 all: libc.a
 
diff --git a/libc/src/memchr.c b/libc/src/memchr.c
@@ -0,0 +1,13 @@
+/* See LICENSE file for copyright and license details. */
+
+#include <string.h>
+
+void *
+memchr(const void *s, int c, size_t n)
+{
+	unsigned char *bp = (char *) s;
+
+	while (n > 0 && *bp++ != c)
+		--n;
+	return (n == 0) ? NULL : bp-1;
+}