Add HAVE_STRNDUP and supporting structure to config.h and make utils.[ch] reflect it.

svn path=/trunk/netsurf/; revision=3351

utils/config.h

@@ -9,7 +9,18 @@
 #ifndef _NETSURF_UTILS_CONFIG_H_
 #define _NETSURF_UTILS_CONFIG_H_
 
-/* This file toggles build options on and off.
+/* Try to detect which features the target OS supports */
+
+#define HAVE_STRNDUP
+#if defined(__FreeBSD__) || (defined(__SRV4) && defined(__sun))
+	/* FreeBSD and Solaris do not have this function, so
+	 * we implement it ourselves in util.c
+	 */
+#undef HAVE_STRNDUP
+char *strndup(const char *s, size_t n);
+#endif
+
+/* This section toggles build options on and off.
  * Simply undefine a symbol to turn the relevant feature off.
  *
  * IF ADDING A FEATURE HERE, ADD IT TO Docs/Doxyfile LINE 892 AS WELL.

utils/utils.c

@@ -257,7 +257,7 @@ unsigned int wallclock(void)
 }
 
 
-#if defined(__FreeBSD__) || (defined(__SVR4) && defined(__sun))
+#ifndef HAVE_STRNDUP
 
 /**
  * Duplicate up to n characters of a string.

utils/utils.h

@@ -59,10 +59,6 @@ const char *rfc1123_date(time_t t);
 char *strcasestr(const char *haystack, const char *needle);
 #endif
 unsigned int wallclock(void);
-#ifdef __FreeBSD__
-/* FreeBSD lacks strndup */
-char *strndup(const char *s, size_t n);
-#endif
 
 /* Platform specific functions */
 void die(const char * const error);