win32: define a custom sprintf_s() weak symbol. The VS2010 runtime does not

provide the deprecated snprintf(). The mingw32 runtime does not provide the
MS-specific sprintf_s(). Mingw-w64 copes with both. So we switch to sprintf_s
but also provide it as a weak symbol so that mingw32 does not complain.

caca/caca.h

@@ -689,6 +689,12 @@ typedef struct cucul_buffer cucul_buffer_t;
 #       define CACA_ALIAS(x)
 #   endif
 
+#   if defined __GNUC__ && __GNUC__ > 3
+#       define CACA_WEAK __attribute__ ((weak))
+#   else
+#       define CACA_WEAK
+#   endif
+
 
 /* Aliases from old libcaca and libcucul functions */
 __extern int cucul_putchar(caca_canvas_t *, int, int,

caca/canvas.c

@@ -341,13 +341,15 @@ int caca_free_canvas(caca_canvas_t *cv)
  *  \return A random integer comprised between \p min  and \p max - 1
  *  (inclusive).
  */
+static caca_timer_t timer = {0, 0};
+
 int caca_rand(int min, int max)
 {
     static int need_init = 1;
 
     if(need_init)
     {
-        srand(getpid() + time(NULL));
+        srand(getpid() + _caca_getticks(&timer));
         need_init = 0;
     }
 

caca/figfont.c

@@ -29,6 +29,10 @@
 #include "caca.h"
 #include "caca_internals.h"
 
+#if defined _WIN32 && defined __GNUC__ && __GNUC__ >= 3
+int sprintf_s(char *s, size_t n, const char *fmt, ...) CACA_WEAK;
+#endif
+
 struct caca_charfont
 {
     int term_width;
@@ -622,6 +626,22 @@ static uint32_t hsmush(uint32_t ch1, uint32_t ch2, int rule)
     return 0;
 }
 
+/*
+ * Functions for the mingw32 runtime
+ */
+
+#if defined _WIN32 && defined __GNUC__ && __GNUC__ >= 3
+int sprintf_s(char *s, size_t n, const char *fmt, ...)
+{
+    va_list args;
+    int ret;
+    va_start(args, fmt);
+    ret = vsnprintf(s, n, fmt, args);
+    va_end(args);
+    return ret;
+}
+#endif
+
 /*
  * XXX: The following functions are aliases.
  */

caca/string.c

@@ -36,6 +36,11 @@
 #include "caca.h"
 #include "caca_internals.h"
 
+#if defined _WIN32 && defined __GNUC__ && __GNUC__ >= 3
+int vsnprintf_s(char *s, size_t n, size_t c,
+                const char *fmt, va_list args) CACA_WEAK;
+#endif
+
 /** \brief Set cursor position.
  *
  *  Put the cursor at the given coordinates. Functions making use of the
@@ -597,6 +602,17 @@ int caca_set_canvas_boundaries(caca_canvas_t *cv, int x, int y, int w, int h)
     return 0;
 }
 
+/*
+ * Functions for the mingw32 runtime
+ */
+
+#if defined _WIN32 && defined __GNUC__ && __GNUC__ >= 3
+int vsnprintf_s(char *s, size_t n, size_t c, const char *fmt, va_list args)
+{
+    return vsnprintf(s, n, fmt, args);
+}
+#endif
+
 /*
  * XXX: The following functions are aliases.
  */