Make strnlen() visible in old versions of glibc

Strnlen() is in POSIX 2008 but was a GNU extension up to glibc 2.10
requiring to define _GNU_SOURCE. This fixes compilation on CentOS 4.9.
Also, move our implementation of strnlen() that was added to support
DJGPP to helpers.c.

Corresponding to flashrom svn r1878.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>

dmi.c

@@ -21,6 +21,13 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
+/* strnlen is in POSIX but was a GNU extension up to glibc 2.10 */
+#if (__GLIBC__ == 2 && __GLIBC_MINOR__ < 10) || __GLIBC__ < 2
+#define _GNU_SOURCE
+#else
+#define _POSIX_C_SOURCE 200809L
+#endif
+
 #include <strings.h>
 #include <string.h>
 #include <ctype.h>
@@ -86,16 +93,6 @@ static const struct {
 };
 
 #if CONFIG_INTERNAL_DMI == 1
-#ifdef __DJGPP__ /* There is no strnlen in DJGPP. FIXME: Move this to a common utility file. */
-size_t strnlen(const char *str, size_t n)
-{
-	size_t i;
-	for (i = 0; i < n && str[i] != '\0'; i++)
-		;
-	return i;
-}
-#endif
-
 static bool dmi_checksum(const uint8_t * const buf, size_t len)
 {
 	uint8_t sum = 0;

flash.h

@@ -260,6 +260,9 @@ void tolower_string(char *str);
 #ifdef __MINGW32__
 char* strtok_r(char *str, const char *delim, char **nextp);
 #endif
+#if defined(__DJGPP__)
+size_t strnlen(const char *str, size_t n);
+#endif
 
 /* flashrom.c */
 extern const char flashrom_version[];

helpers.c

@@ -91,3 +91,13 @@ char* strtok_r(char *str, const char *delim, char **nextp)
 }
 #endif
 
+/* There is no strnlen in DJGPP */
+#if defined(__DJGPP__)
+size_t strnlen(const char *str, size_t n)
+{
+	size_t i;
+	for (i = 0; i < n && str[i] != '\0'; i++)
+		;
+	return i;
+}
+#endif