temporal VC patch from nkshigeru

include/mrbconf.h

@@ -45,6 +45,8 @@ typedef intptr_t mrb_sym;
 #ifdef _MSC_VER
 # define inline __inline
 # define snprintf _snprintf
+# define isnan _isnan
+# define isinf(n) (!_finite(n) && !_isnan(n))
 #endif
 
 #endif  /* MRUBYCONF_H */

src/encoding.c

@@ -1348,7 +1348,11 @@ set_default_internal(mrb_state *mrb, mrb_value klass)
 }
 
 #define digit(x) ((x) >= '0' && (x) <= '9')
+#ifndef _MSC_VER
 #define strstart(s, n) (strncasecmp(s, n, strlen(n)) == 0)
+#else
+#define strstart(s, n) (_stricmp(s, n) == 0)
+#endif
 #define C_CODESET "US-ASCII"     /* Return this as the encoding of the
                                   * C/POSIX locale. Could as well one day
                                   * become "UTF-8". */

src/transcode.c

@@ -13,6 +13,9 @@
 #ifdef INCLUDE_ENCODING
 #include "encoding.h"
 #include <sys/types.h> /* for ssize_t */
+#ifdef _MSC_VER
+typedef int ssize_t;
+#endif
 #include "transcode_data.h"
 #include <ctype.h>
 #include "st.h"