string: add strlcpy support

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Andrea GALLO <andrea.gallo@stericsson.com>
Cc: Gael SALLES <gael.salles@stericsson.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/string.c b/lib/string.c
index cbb13d3287..77435aad79 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -62,6 +62,32 @@ char * strncpy(char * dest,const char *src,size_t count)
 #endif
 EXPORT_SYMBOL(strncpy);
 
+#ifndef __HAVE_ARCH_STRLCPY
+/**
+ * strlcpy - Copy a %NUL terminated string into a sized buffer
+ * @dest: Where to copy the string to
+ * @src: Where to copy the string from
+ * @size: size of destination buffer
+ *
+ * Compatible with *BSD: the result is always a valid
+ * NUL-terminated string that fits in the buffer (unless,
+ * of course, the buffer size is zero). It does not pad
+ * out the result like strncpy() does.
+ */
+size_t strlcpy(char *dest, const char *src, size_t size)
+{
+	size_t ret = strlen(src);
+
+	if (size) {
+		size_t len = (ret >= size) ? size - 1 : ret;
+		memcpy(dest, src, len);
+		dest[len] = '\0';
+	}
+	return ret;
+}
+EXPORT_SYMBOL(strlcpy);
+#endif
+
 #ifndef __HAVE_ARCH_STRCAT
 /**
  * strcat - Append one %NUL-terminated string to another