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MSVC: add simple (v)snprintf implementation

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_snprintf is not C99's snprintf!

This simple implementation, unlike _snprintf,
always null-terminates and returns the expected
return value (in most cases).
Other C99 behaviors (like format specifiers) require
adding a complete snprintf implementation.
Do we want or need that?

The same applies to vsnprintf (aka _vsnprintf).
This commit is contained in:
cremno
2014-08-03 21:15:48 +02:00
parent 206f89e209
commit b6e27218ad
2 changed files with 43 additions and 2 deletions
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include/mruby/value.h
+6 -2
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@@ -31,7 +31,7 @@ struct mrb_state;
# define MRB_INT_MIN (INT32_MIN>>MRB_FIXNUM_SHIFT)
# define MRB_INT_MAX (INT32_MAX>>MRB_FIXNUM_SHIFT)
#endif
#ifdef MRB_USE_FLOAT
typedef float mrb_float;
# define mrb_float_to_str(buf, i) sprintf(buf, "%.7e", i)
@@ -47,7 +47,11 @@ struct mrb_state;
# define inline __inline
# endif
# if _MSC_VER < 1900
# define snprintf _snprintf
# include <stdarg.h>
MRB_API int mrb_msvc_vsnprintf(char *s, size_t n, const char *format, va_list arg);
MRB_API int mrb_msvc_snprintf(char *s, size_t n, const char *format, ...);
# define vsnprintf(s, n, format, arg) mrb_msvc_vsnprintf(s, n, format, arg)
# define snprintf(s, n, format, ...) mrb_msvc_snprintf(s, n, format, __VA_ARGS__)
# endif
# if _MSC_VER < 1800
# include <float.h>