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[tests] use srand/rand on windows, declare mkstemp and srandom for c99

--- a/tests/utils_tests.h

+++ b/tests/utils_tests.h

@@ -55,21 +55,20 @@

 #define RAND_MAX 32767

 #endif

-// are we on windows ? or are we using -std=c99 ?

-#if defined(HAVE_WIN_HACKS) || defined(__STRICT_ANSI__)

-// http://en.wikipedia.org/wiki/Linear_congruential_generator

-// no srandom/random on win32

+#if defined(HAVE_WIN_HACKS)

-uint_t srandom_seed = 1029;

+// use srand/rand on windows

+#define srandom srand

+#define random rand

-void srandom(uint_t new_seed) {

-    srandom_seed = new_seed;

-}

+#elif defined(__STRICT_ANSI__)

-uint_t random(void) {

-    srandom_seed = 1664525 * srandom_seed + 1013904223;

-    return srandom_seed;

-}

+// workaround to build with -std=c99 (for instance with older cygwin),

+// assuming libbc is recent enough to supports these functions.

+extern void srandom(unsigned);

+extern int random(void);

+extern char mkstemp(const char *pat);

+

 #endif

 void utils_init_random (void);