diff options
| -rw-r--r-- | win32/lib/crt1.c | 76 |
1 files changed, 53 insertions, 23 deletions
diff --git a/win32/lib/crt1.c b/win32/lib/crt1.c index aa7a01f..cb8bfc0 100644 --- a/win32/lib/crt1.c +++ b/win32/lib/crt1.c @@ -1,48 +1,78 @@ // ============================================= // crt1.c -#include <stdlib.h> // For ExitProcess +// windows.h header file should be included before any other library include #include <windows.h> +#include <stdio.h> +#include <stdlib.h> + +#define _UNKNOWN_APP 0 +#define _CONSOLE_APP 1 +#define _GUI_APP 2 -#define __UNKNOWN_APP 0 -#define __CONSOLE_APP 1 -#define __GUI_APP 2 -void __set_app_type(int); -void _controlfp(unsigned a, unsigned b); +#define _MCW_PC 0x00030000 // Precision Control +#define _PC_24 0x00020000 // 24 bits +#define _PC_53 0x00010000 // 53 bits +#define _PC_64 0x00000000 // 64 bits typedef struct { int newmode; } _startupinfo; -// prototype of __getmainargs: -// in msvcrt v6.0 : return void -// in msvcrt v7.0 : return int -// using first for compatibility -void __getmainargs(int *pargc, char ***pargv, char ***penv, int globb, _startupinfo*); -int main(int argc, char **argv, char **env); +// Prototype of __getmainargs: +// in msvcrt v6.x : returns void (windows 98, 2000) +// in msvcrt v7.x : returns int (windows xp and above) +// Using the last for check the result. A negative value means no success. +// These are the test results of call to __getmainargs with the heap fully: +// win 98, 2000 : +// program termination with error code 255 after call _amsg_exit(8) +// prints: "runtime error R6008\r\n- not enough space for arguments\r\n" +// win xp : +// returns -1 +// win 7, 8 : +// program termination with error code -1 after call ExitProcess(-1) +// +// Checking the return of this function also works on windows 98 and 2000 +// because internally it sets to eax the value of the third parameter. +// In this case is &env and at that point it is not a negative value. -int _start(void) +int __cdecl __getmainargs(int *pargc, char ***pargv, char ***penv, int globb, _startupinfo*); +void __cdecl __set_app_type(int apptype); +unsigned int __cdecl _controlfp(unsigned int new_value, unsigned int mask); + +void _start(void); +int main(int argc, char * argv[], char * env[]); + +void _start(void) { __TRY__ - int argc; char **argv; char **env; - _startupinfo start_info = {0}; + int argc; + char **argv; + char **env; + _startupinfo start_info; + + // Sets the current application type + __set_app_type(_CONSOLE_APP); - _controlfp(0x10000, 0x30000); - __set_app_type(__CONSOLE_APP); + // Set default FP precision to 53 bits (8-byte double) + // _MCW_PC (Precision control) is not supported on + // the ARM and x64 architectures +#if defined(_X86_) && !defined(__x86_64) + _controlfp(_PC_53, _MCW_PC); +#endif - argv = NULL; - __getmainargs(&argc, &argv, &env, 0, &start_info); - // check success comparing if argv now is not NULL - if (argv != NULL) + start_info.newmode = 0; + if ( __getmainargs( &argc, &argv, &env, 0, &start_info ) < 0 ) { - exit( main(argc, argv, env) ); + ExitProcess(-1); } else { - ExitProcess(-1); + exit( main(argc, argv, env) ); } + } // ============================================= |