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251 | /* NOTE: build command: cl main.c -nologo -Zi -Od */
#include <windows.h>
#include <stdio.h>
#include <assert.h>
typedef enum Error {
error_none,
error_create_process,
error_wait_for_process,
error_path_environment_variable_not_found,
error_path_could_not_be_set,
error_mark_not_found,
} Error;
void printWindowsError( char* message, DWORD error ) {
char buffer[ 1024 ];
DWORD flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;
FormatMessage( flags, 0, error, 0, buffer, 1024, 0 );
printf( "%s%s\n", message, buffer );
}
int main( int argc, char* argv[ ] ) {
Error error = 0;
/* NOTE: Redirecting standard i/o:
stdout, stdin and stderror are all required, you can't just specify one or the other will be INVALID_HANDLE_VALUE.
Also you need to set inherit handles when creating the file and when creating the process. */
SECURITY_ATTRIBUTES security = { 0 };
security.nLength = sizeof( security );
security.lpSecurityDescriptor = 0;
security.bInheritHandle = 1;
HANDLE std_out = CreateFile( "out.txt", GENERIC_READ | GENERIC_WRITE, 0, &security, CREATE_ALWAYS, 0, 0 );
HANDLE std_in = GetStdHandle( STD_INPUT_HANDLE );
HANDLE std_error = GetStdHandle( STD_ERROR_HANDLE );
{
printf( "Calling vcvarsall: " );
PROCESS_INFORMATION processInformation = { 0 };
STARTUPINFO startupInformation = { 0 };
startupInformation.cb = sizeof( startupInformation );
startupInformation.dwFlags = STARTF_USESTDHANDLES;
startupInformation.hStdOutput = std_out;
startupInformation.hStdInput = std_in;
startupInformation.hStdError = std_error;
/* NOTE: echo __env_start_mark__ because stdout will contain anything printed by vcvarsall and we want to know when the environment starts.
Also if vcvarsall fails, the output will not contain the string because we used &&. */
char command[ ] = "cmd /C \"C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\Community\\VC\\Auxiliary\\Build\\vcvarsall.bat\" x64 && echo __env_start_mark__ && set";
BOOL inheritHandles = 1;
if ( CreateProcessA( 0, command, 0, 0, inheritHandles, 0, 0, 0, &startupInformation, &processInformation ) ) {
if ( processInformation.hProcess != 0 ) {
DWORD waitStatus = WaitForSingleObject( processInformation.hProcess, INFINITE );
if ( waitStatus != WAIT_OBJECT_0 ) {
error = error_wait_for_process;
if ( waitStatus == WAIT_FAILED ) {
printWindowsError( "FAILED.\nWait for process error: ", GetLastError( ) );
}
} else {
printf( "SUCCESS.\n" );
}
}
if ( processInformation.hProcess ) {
CloseHandle( processInformation.hProcess );
}
if ( processInformation.hThread ) {
CloseHandle( processInformation.hThread );
}
} else {
error = error_create_process;
printWindowsError( "FAILED.\nCreate process error: ", GetLastError( ) );
}
}
char* envBlockStart = 0;
if ( !error ) {
printf( "Creating environment block: " );
LARGE_INTEGER size;
LARGE_INTEGER zero = { 0 };
GetFileSizeEx( std_out, &size );
SetFilePointerEx( std_out, zero, 0, FILE_BEGIN );
/* NOTE: +1 to make sure we have space for the block end '0'.
In practice we always have space if there is at least 2 environment variables because of the '\r'.*/
char* file = malloc( size.QuadPart + 1 );
DWORD read;
ReadFile( std_out, file, size.LowPart, &read, 0 );
CloseHandle( std_out );
DeleteFile( "out.txt" );
char* end = file + size.QuadPart;
char* current = file;
char* mark = "__env_start_mark__";
size_t markLength = sizeof( "__env_start_mark__" ) - 1;
int found = 0;
while ( current + markLength < end ) {
if ( strncmp( mark, current, markLength ) == 0 ) {
found = 1;
break;
} else {
current++;
}
}
if ( found ) {
current += markLength;
while ( current < end && *current != '\n' ) {
current++;
}
current++;
char* out = current;
envBlockStart = out;
/* NOTE: We need to remember the path environment variable. See below. */
char* path = 0;
char* pathString1 = "PATH=";
char* pathString2 = "Path=";
char* pathString3 = "path=";
size_t pathStringLength = sizeof( "PATH=" ) - 1;
while ( current < end ) {
if ( *current == '\n' ) {
*out = 0;
out++;
if ( !path ) {
char* test = current + 1;
if ( test + pathStringLength < end && ( strncmp( test, pathString1, pathStringLength ) == 0 || strncmp( test, pathString2, pathStringLength ) == 0 || strncmp( test, pathString3, pathStringLength ) == 0 ) ) {
path = out;
}
}
} else if ( *current == '\r' ) {
} else {
*out = *current;
out++;
}
current++;
}
*out = 0;
out++;
size_t envBlockLength = out - envBlockStart;
assert( envBlockLength <= 32767 );
if ( path ) {
path[ pathStringLength - 1 ] = 0;
/* NOTE: We need to set the current process path so CreateProcess will search for cl.exe in Visual Studio's folders.*/
if ( !SetEnvironmentVariable( path, path + pathStringLength ) ) {
error = error_path_could_not_be_set;
printWindowsError( "FAILED.\nCouldn't set the path environment variable: ", GetLastError( ) );
} else {
path[ pathStringLength - 1 ] = '=';
printf( "SUCCESS.\nPath environment variable found and set.\n" );
}
} else {
error = error_path_environment_variable_not_found;
printf( "FAILED.\nCould not find the path environment variable.\n" );
}
} else {
error = error_mark_not_found;
printf( "FAILED.\nCould not find the mark.\n" );
}
}
if ( !error ) {
printf( "Calling cl:\n" );
PROCESS_INFORMATION processInformation = { 0 };
STARTUPINFO startupInformation = { 0 };
startupInformation.cb = sizeof( startupInformation );
char command[ ] = "cl";
if ( CreateProcessA( 0, command, 0, 0, 0, 0, envBlockStart, 0, &startupInformation, &processInformation ) ) {
if ( processInformation.hProcess != 0 ) {
DWORD waitStatus = WaitForSingleObject( processInformation.hProcess, INFINITE );
if ( waitStatus != WAIT_OBJECT_0 ) {
error = error_wait_for_process;
if ( waitStatus == WAIT_FAILED ) {
printWindowsError( "FAILED.\nWait for process error: ", GetLastError( ) );
}
} else {
printf( "SUCCESS.\n" );
}
}
if ( processInformation.hProcess ) {
CloseHandle( processInformation.hProcess );
}
if ( processInformation.hThread ) {
CloseHandle( processInformation.hThread );
}
} else {
error = error_create_process;
printWindowsError( "FAILED.\nCreate process error: ", GetLastError( ) );
}
}
printf( "Press any key to exit.\n" );
getchar( );
return error;
}
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