MinGW-w64 (v)snprintf() implementation uses windows functions _(v)snprintf()
and _(v)scprintf(). Runtime library crtdll.dll provides only _(v)snprintf(),
so include MinGW-w64 emulation of _(v)scprintf() functions into libcrtdll.a
import library.
As <msvcrt.h> header file and __mingw_get_msvcrt_handle() function depend
on msvcrtl.dll library do not use them in _scprintf.c and _vscprintf.c
source files when building object files for libcrtdll.a import library.
With this change it is possible to use snprintf() function in application
which uses crtdll.dll runtime library.
---
mingw-w64-crt/Makefile.am | 3 +++
mingw-w64-crt/stdio/_scprintf.c | 21 ++++++++++++++++++++-
mingw-w64-crt/stdio/_vscprintf.c | 11 ++++++++++-
3 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/mingw-w64-crt/Makefile.am b/mingw-w64-crt/Makefile.am
index c669f131c5f1..305d1b934e65 100644
--- a/mingw-w64-crt/Makefile.am
+++ b/mingw-w64-crt/Makefile.am
@@ -425,6 +425,9 @@ src_crtdll=\
misc/__set_app_type.c \
misc/invalid_parameter_handler.c \
misc/lc_locale_func.c \
+ misc/seterrno.c \
+ stdio/_scprintf.c \
+ stdio/_vscprintf.c \
stdio/mingw_lock.c
src_msvcr120_app=\
diff --git a/mingw-w64-crt/stdio/_scprintf.c b/mingw-w64-crt/stdio/_scprintf.c
index eb3044a8c5df..bcee08a957b7 100644
--- a/mingw-w64-crt/stdio/_scprintf.c
+++ b/mingw-w64-crt/stdio/_scprintf.c
@@ -4,7 +4,6 @@
* No warranty is given; refer to the file DISCLAIMER.PD within this package.
*/
#include <windows.h>
-#include <msvcrt.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
@@ -21,6 +20,24 @@ static int __cdecl emu_scprintf(const char * __restrict__
format, ...)
return ret;
}
+#ifndef __LIBMSVCRT_OS__
+
+int (__cdecl *__MINGW_IMP_SYMBOL(_scprintf))(const char * __restrict__, ...) =
emu_scprintf;
+
+/* gcc does not provide an easy way to call another variadic function with
reusing current arguments
+ * this source file is used only on i386, so do this function redirect via
inline i386 assembly */
+#define ASM_SYM(sym) __MINGW64_STRINGIFY(__MINGW_USYMBOL(sym))
+asm (
+".globl\t" ASM_SYM(_scprintf) "\n\t"
+".def\t" ASM_SYM(_scprintf) ";\t.scl\t2;\t.type\t32;\t.endef\n"
+ASM_SYM(_scprintf) ":\n\t"
+ "jmp\t*" ASM_SYM(__MINGW_IMP_SYMBOL(_scprintf))
+);
+
+#else
+
+#include <msvcrt.h>
+
static int __cdecl init_scprintf(const char * __restrict__ format, ...);
int (__cdecl *__MINGW_IMP_SYMBOL(_scprintf))(const char * __restrict__, ...) =
init_scprintf;
@@ -55,3 +72,5 @@ ASM_SYM(init_scprintf) ":\n\t"
ASM_SYM(_scprintf) ":\n\t"
"jmp\t*" ASM_SYM(__MINGW_IMP_SYMBOL(_scprintf))
);
+
+#endif
diff --git a/mingw-w64-crt/stdio/_vscprintf.c b/mingw-w64-crt/stdio/_vscprintf.c
index 6bbbb274a5ff..b859b9a2a028 100644
--- a/mingw-w64-crt/stdio/_vscprintf.c
+++ b/mingw-w64-crt/stdio/_vscprintf.c
@@ -4,7 +4,6 @@
* No warranty is given; refer to the file DISCLAIMER.PD within this package.
*/
#include <windows.h>
-#include <msvcrt.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
@@ -53,6 +52,14 @@ static int __cdecl emu_vscprintf(const char * __restrict__
format, va_list argli
return ret;
}
+#ifndef __LIBMSVCRT_OS__
+
+int (__cdecl *__MINGW_IMP_SYMBOL(_vscprintf))(const char * __restrict__,
va_list) = emu_vscprintf;
+
+#else
+
+#include <msvcrt.h>
+
static int __cdecl init_vscprintf(const char * __restrict__ format, va_list
arglist);
int (__cdecl *__MINGW_IMP_SYMBOL(_vscprintf))(const char * __restrict__,
va_list) = init_vscprintf;
@@ -71,6 +78,8 @@ static int __cdecl init_vscprintf(const char * __restrict__
format, va_list argl
return (__MINGW_IMP_SYMBOL(_vscprintf) = func)(format, arglist);
}
+#endif
+
int __cdecl _vscprintf(const char * __restrict__ format, va_list arglist)
{
return __MINGW_IMP_SYMBOL(_vscprintf)(format, arglist);
--
2.20.1
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