smdev

commit 45fd3d0069b5df0425315554f9d8b3ea1872160b
parent f3d717b243124de07993fbca764825752f1ecc64
Author: sin <sin@2f30.org>
Date:   Sat,  2 Aug 2014 13:51:52 +0100

Use OpenBSD strlcpy()

I don't remember where the previous implementation comes from and
therefore I can't provide appropriate credit.

Diffstat:
M
util/strlcpy.c
 | 
49
++++++++++++++++++++++++++++++++++++++++---------

1 file changed, 40 insertions(+), 9 deletions(-)
diff --git a/util/strlcpy.c b/util/strlcpy.c
@@ -1,16 +1,47 @@
-#include <stdio.h>
+/*
+ * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
 #include <string.h>
 #include "../util.h"
 
+/*
+ * Copy src to string dst of size siz. At most siz-1 characters
+ * will be copied. Always NUL terminates (unless siz == 0).
+ * Returns strlen(src); if retval >= siz, truncation occurred.
+ */
 size_t
-strlcpy(char *dest, const char *src, size_t size)
+strlcpy(char *dst, const char *src, size_t siz)
 {
-	size_t ret = strlen(src);
-
-	if (size) {
-		size_t len = (ret >= size) ? size - 1 : ret;
-		memcpy(dest, src, len);
-		dest[len] = '\0';
+	char *d = dst;
+	const char *s = src;
+	size_t n = siz;
+	/* Copy as many bytes as will fit */
+	if (n != 0) {
+		while (--n != 0) {
+			if ((*d++ = *s++) == '\0')
+				break;
+		}
+	}
+	/* Not enough room in dst, add NUL and traverse rest of src */
+	if (n == 0) {
+		if (siz != 0)
+			*d = '\0'; /* NUL-terminate dst */
+		while (*s++)
+			;
 	}
-	return ret;
+	return(s - src - 1); /* count does not include NUL */
 }