Split out is_printable_string() into util.c

This useful function is split out so it will be available to programs
other than ftdump.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 3 insertions, 25 deletions

diff --git a/ftdump.c b/ftdump.c
index bce6535..db932e3 100644
--- a/ftdump.c
+++ b/ftdump.c
@@ -11,36 +11,14 @@
 #include <fdt.h>
 #include <libfdt_env.h>
 
+#include "util.h"
+
 #define FTDUMP_BUF_SIZE	65536
 
 #define ALIGN(x, a)	(((x) + ((a) - 1)) & ~((a) - 1))
 #define PALIGN(p, a)	((void *)(ALIGN((unsigned long)(p), (a))))
 #define GET_CELL(p)	(p += 4, *((const uint32_t *)(p-4)))
 
-static int is_printable_string(const void *data, int len)
-{
-	const char *s = data;
-	const char *ss;
-
-	/* zero length is not */
-	if (len == 0)
-		return 0;
-
-	/* must terminate with zero */
-	if (s[len - 1] != '\0')
-		return 0;
-
-	ss = s;
-	while (*s && isprint(*s))
-		s++;
-
-	/* not zero, or not done yet */
-	if (*s != '\0' || (s + 1 - ss) < len)
-		return 0;
-
-	return 1;
-}
-
 static void print_data(const char *data, int len)
 {
 	int i;
@@ -50,7 +28,7 @@ static void print_data(const char *data, int len)
 	if (len == 0)
 		return;
 
-	if (is_printable_string(data, len)) {
+	if (util_is_printable_string(data, len)) {
 		printf(" = \"%s\"", (const char *)data);
 	} else if ((len % 4) == 0) {
 		printf(" = <");