ISO C does not define (v)snwprintf() function. But ISO C11 in optional
Appendix K defines (v)snwprintf_s() function which has same behavior as
non-wide ISO C11 Appendix K (v)snprintf_s() function (which is secure
variant of (v)snprintf()).
Function (v)snwprintf() is not provided by any MS CRT library and neither
by any MS header file.
mingw32 runtime and mingw-w64 runtime since beginning provide function
named (v)snwprintf (without leading underscore) and define it under symbol
name __mingw_(v)snwprintf. This function differs from ISO C (v)swprintf()
just in return value. ISO C (v)swprintf() when buffer is too small returns
negative value but this (v)snwprintf() returns size of buffer in wide
characters, similarly to non-wide ISO C (v)snprintf() function, and also
similarly to ISO C11 Annex K (v)snwprintf_s(). This non-ISO (v)snwprintf()
and both ISO C (v)snwprintf_s() and (v)snprintf() always fill trailing nul
character.
But when __USE_MINGW_ANSI_STDIO=0 the (v)snwprintf() is redirected to
__ms_(v)snwprintf() function, which is just wrapper around msvcrt
_vsnwprintf() function. And msvcrt _vsnwprintf() function does not fill
trailing nul character and does not return required buffer size when output
buffer is too small.
So fix __ms_(v)snwprintf() functions to properly fill trailing nul
character and return required size of bufer, like ISO C vsnprintf().
Also adjust header files and remove wrong symbol aliases for (v)snwprintf
symbols from def files.
This will make API of (v)snwprintf() function compatible for both
__USE_MINGW_ANSI_STDIO=0 and __USE_MINGW_ANSI_STDIO=1 modes and also to
mimics API of ISO C (v)snwprintf_s() function.
---
mingw-w64-crt/lib-common/msvcrt.def.in | 5 -----
mingw-w64-crt/lib32/msvcr120.def.in | 2 --
mingw-w64-crt/lib32/msvcr120d.def.in | 2 --
mingw-w64-crt/lib64/msvcr120.def.in | 2 --
mingw-w64-crt/lib64/msvcr120d.def.in | 2 --
mingw-w64-crt/stdio/snwprintf.c | 2 +-
mingw-w64-crt/stdio/vsnwprintf.c | 20 +++++++++++++++++++-
mingw-w64-headers/crt/stdio.h | 22 ++++------------------
mingw-w64-headers/crt/wchar.h | 21 ++++-----------------
9 files changed, 28 insertions(+), 50 deletions(-)
diff --git a/mingw-w64-crt/lib-common/msvcrt.def.in
b/mingw-w64-crt/lib-common/msvcrt.def.in
index aec34d43f64b..ab085571b498 100644
--- a/mingw-w64-crt/lib-common/msvcrt.def.in
+++ b/mingw-w64-crt/lib-common/msvcrt.def.in
@@ -1926,8 +1926,3 @@ F_I386(_libm_sse2_tan_precise)
#define USE_WCSTOK_S_FOR_WCSTOK
#endif
#include "crt-aliases.def.in"
-
-; This is list of additional symbol aliases not available in any CRT library
-; FIXME: check if these really are needed
-snwprintf == _snwprintf
-vsnwprintf == _vsnwprintf
diff --git a/mingw-w64-crt/lib32/msvcr120.def.in
b/mingw-w64-crt/lib32/msvcr120.def.in
index f390148889d5..e1351c6c2c85 100644
--- a/mingw-w64-crt/lib32/msvcr120.def.in
+++ b/mingw-w64-crt/lib32/msvcr120.def.in
@@ -2233,8 +2233,6 @@ vfwscanf
vfwscanf_s
vprintf
vprintf_s
-snwprintf == _snwprintf
-vsnwprintf == _vsnwprintf
vscanf
vscanf_s
vsprintf
diff --git a/mingw-w64-crt/lib32/msvcr120d.def.in
b/mingw-w64-crt/lib32/msvcr120d.def.in
index 78ffafba026a..a4f773d67c7b 100644
--- a/mingw-w64-crt/lib32/msvcr120d.def.in
+++ b/mingw-w64-crt/lib32/msvcr120d.def.in
@@ -2300,8 +2300,6 @@ vfwscanf
vfwscanf_s
vprintf
vprintf_s
-snwprintf == _snwprintf
-vsnwprintf == _vsnwprintf
vscanf
vscanf_s
vsprintf
diff --git a/mingw-w64-crt/lib64/msvcr120.def.in
b/mingw-w64-crt/lib64/msvcr120.def.in
index 9f3f623ea32d..2555d0118032 100644
--- a/mingw-w64-crt/lib64/msvcr120.def.in
+++ b/mingw-w64-crt/lib64/msvcr120.def.in
@@ -1592,8 +1592,6 @@ _vsnprintf_c_l
_vsnprintf_l
_vsnprintf_s
_vsnprintf_s_l
-snwprintf == _snwprintf
-vsnwprintf == _vsnwprintf
_vsnwprintf
_vsnwprintf_l
_vsnwprintf_s
diff --git a/mingw-w64-crt/lib64/msvcr120d.def.in
b/mingw-w64-crt/lib64/msvcr120d.def.in
index 84318c242e8d..4baf686413c4 100644
--- a/mingw-w64-crt/lib64/msvcr120d.def.in
+++ b/mingw-w64-crt/lib64/msvcr120d.def.in
@@ -1651,8 +1651,6 @@ _vsnprintf_c_l
_vsnprintf_l
_vsnprintf_s
_vsnprintf_s_l
-snwprintf == _snwprintf
-vsnwprintf == _vsnwprintf
_vsnwprintf
_vsnwprintf_l
_vsnwprintf_s
diff --git a/mingw-w64-crt/stdio/snwprintf.c b/mingw-w64-crt/stdio/snwprintf.c
index c57a46d893ce..6abf77a44424 100644
--- a/mingw-w64-crt/stdio/snwprintf.c
+++ b/mingw-w64-crt/stdio/snwprintf.c
@@ -12,7 +12,7 @@ int __cdecl __ms_snwprintf(wchar_t *buffer, size_t n, const
wchar_t *format, ...
va_list argptr;
va_start(argptr, format);
- retval = _vsnwprintf(buffer, n, format, argptr);
+ retval = __ms_vsnwprintf(buffer, n, format, argptr);
va_end(argptr);
return retval;
}
diff --git a/mingw-w64-crt/stdio/vsnwprintf.c b/mingw-w64-crt/stdio/vsnwprintf.c
index b5c5ae65cf74..626889a30499 100644
--- a/mingw-w64-crt/stdio/vsnwprintf.c
+++ b/mingw-w64-crt/stdio/vsnwprintf.c
@@ -12,5 +12,23 @@ int __cdecl __ms_vsnwprintf(wchar_t *buffer, size_t n,
const wchar_t * format,
int __cdecl __ms_vsnwprintf(wchar_t *buffer, size_t n, const wchar_t *
format, va_list argptr)
{
- return _vsnwprintf(buffer, n, format, argptr);
+ int retval;
+
+ /* _vsnwprintf() does not work with zero length buffer
+ * so count number of characters by _vscwprintf() call */
+ if (n == 0)
+ return _vscwprintf(format, argptr);
+
+ retval = _vsnwprintf(buffer, n, format, argptr);
+
+ /* _vsnwprintf() does not fill trailing null character if there is not
place for it */
+ if (retval < 0 || (size_t)retval == n)
+ buffer[n-1] = '\0';
+
+ /* _vsnwprintf() returns negative number if buffer is too small
+ * so count number of characters by _vscwprintf() call */
+ if (retval < 0)
+ retval = _vscwprintf(format, argptr);
+
+ return retval;
}
diff --git a/mingw-w64-headers/crt/stdio.h b/mingw-w64-headers/crt/stdio.h
index 3934754b01f1..f33009a0f593 100644
--- a/mingw-w64-headers/crt/stdio.h
+++ b/mingw-w64-headers/crt/stdio.h
@@ -1214,7 +1214,7 @@ int vsnwprintf (wchar_t *__stream, size_t __n, const
wchar_t *__format, __builti
}
__mingw_ovr
- int snwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, ...)
+ int __cdecl snwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, ...)
{
__builtin_va_list __ap;
int __ret;
@@ -1226,8 +1226,7 @@ int vsnwprintf (wchar_t *__stream, size_t __n, const
wchar_t *__format, __builti
__mingw_ovr
int __cdecl vsnwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, va_list arg)
{
- int __ret = __stdio_common_vswprintf(_CRT_INTERNAL_LOCAL_PRINTF_OPTIONS,
s, n, format, NULL, arg);
- return __ret < 0 ? -1 : __ret;
+ return __stdio_common_vswprintf(_CRT_INTERNAL_LOCAL_PRINTF_OPTIONS |
_CRT_INTERNAL_PRINTF_STANDARD_SNPRINTF_BEHAVIOR, s, n, format, NULL, arg);
}
#endif
@@ -1266,21 +1265,8 @@ int vsnwprintf (wchar_t *__stream, size_t __n, const
wchar_t *__format, __builti
#if __USE_MINGW_ANSI_STDIO == 0
int __cdecl __ms_snwprintf (wchar_t * __restrict__ s, size_t n, const
wchar_t * __restrict__ format, ...);
int __cdecl __ms_vsnwprintf (wchar_t * __restrict__ , size_t, const wchar_t
* __restrict__ , va_list);
- __mingw_ovr
- int snwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, ...)
- {
- int r;
- va_list argp;
- __builtin_va_start (argp, format);
- r = _vsnwprintf (s, n, format, argp);
- __builtin_va_end (argp);
- return r;
- }
- __mingw_ovr
- int __cdecl vsnwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, va_list arg)
- {
- return _vsnwprintf(s,n,format,arg);
- }
+ int __cdecl snwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, ...);
+ int __cdecl vsnwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, va_list arg);
#endif
#endif /* ! __NO_ISOCEXT */
diff --git a/mingw-w64-headers/crt/wchar.h b/mingw-w64-headers/crt/wchar.h
index 25f222e85dcd..6d4555dd2b32 100644
--- a/mingw-w64-headers/crt/wchar.h
+++ b/mingw-w64-headers/crt/wchar.h
@@ -731,12 +731,12 @@ __MINGW_ASM_CALL(__mingw_vsnwprintf);
__builtin_va_start(__ap, format);
__ret = __stdio_common_vswprintf(_CRT_INTERNAL_LOCAL_PRINTF_OPTIONS |
_CRT_INTERNAL_PRINTF_STANDARD_SNPRINTF_BEHAVIOR, s, n, format, NULL, __ap);
__builtin_va_end(__ap);
- return __ret;
+ return __ret < 0 ? -1 : __ret;
}
__mingw_ovr
int __cdecl vsnwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, va_list arg)
{
- int __ret = __stdio_common_vswprintf(_CRT_INTERNAL_LOCAL_PRINTF_OPTIONS,
s, n, format, NULL, arg);
+ int __ret = __stdio_common_vswprintf(_CRT_INTERNAL_LOCAL_PRINTF_OPTIONS |
_CRT_INTERNAL_PRINTF_STANDARD_SNPRINTF_BEHAVIOR, s, n, format, NULL, arg);
return __ret < 0 ? -1 : __ret;
}
#endif
@@ -758,21 +758,8 @@ __MINGW_ASM_CALL(__mingw_vsnwprintf);
# undef vsnwprintf
int __cdecl __ms_snwprintf (wchar_t * __restrict__ s, size_t n, const
wchar_t * __restrict__ format, ...);
int __cdecl __ms_vsnwprintf (wchar_t * __restrict__ , size_t, const wchar_t
* __restrict__ , va_list);
- __mingw_ovr
- int snwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, ...)
- {
- int r;
- va_list argp;
- __builtin_va_start (argp, format);
- r = _vsnwprintf (s, n, format, argp);
- __builtin_va_end (argp);
- return r;
- }
- __mingw_ovr
- int __cdecl vsnwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, va_list arg)
- {
- return _vsnwprintf(s,n,format,arg);
- }
+ int __cdecl snwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, ...);
+ int __cdecl vsnwprintf (wchar_t * __restrict__ s, size_t n, const wchar_t *
__restrict__ format, va_list arg);
#pragma pop_macro ("vsnwprintf")
#pragma pop_macro ("snwprintf")
#endif
--
2.20.1
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