A simple wrapper to invoke the extractbb mode of xdvipdfmx

extractbb-wrapper.c

/*  A simple wrapper to invoke the extractbb mode of xdvipdfmx

    Copyright 2024 Yukimasa Morimi (@h20y6m)

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
 */

#include <windows.h>

#include <stdio.h>
#include <wchar.h>

static void append_arg(wchar_t *command, const wchar_t *arg);

int wmain(int argc, wchar_t *argv[])
{
	wchar_t wszExePath[32768 + 256] = { 0 };
	wchar_t wszCommand[32768] = { 0 };
	int nRet = 0;

	_wputenv_s(L"openin_any", L"r");
	_wputenv_s(L"openout_any", L"p");
	_wputenv_s(L"command_line_encoding", L"utf-8");
	_wputenv_s(L"TEXLIVE_WINDOWS_EXTERNAL_GS", L"NUL");

	/* Get xdvipdfmx.exe path in self directory. */
	{
		wchar_t *ptr;
		DWORD nSize;

		nSize = GetModuleFileNameW(NULL, wszExePath, 32768);
		if (nSize == 0 || nSize >= 32768)
		{
			fprintf(stderr, "extractbb-wrapper: error: GetModuleFileNameW failed (LastError=%d)\n", (int)GetLastError());
			return 1;
		}

		ptr = wcsrchr(wszExePath, L'\\');
		ptr = (ptr == NULL) ? &wszExePath[0] : (ptr + 1);
		wcscpy(ptr, L"xdvipdfmx.exe");
#ifdef DEBUG
		wcscpy(wszExePath, L"C:\\texlive\\2024\\bin\\windows\\xdvipdfmx.exe");
#endif /* DEBUG */
	}
#ifdef DEBUG
	fprintf(stderr, "extractbb-wrapper: debug: wszExePath=");
	WriteConsoleW(GetStdHandle(STD_ERROR_HANDLE), wszExePath, (DWORD)wcslen(wszExePath), NULL, NULL);
	fprintf(stderr, "\n");
#endif /* DEBUG */

	/* Make command line */
	{
		int i;
		wcscpy(wszCommand, L"ebb");
		append_arg(wszCommand, L"--extractbb");
		for (i = 1; i < argc; i++)
		{
			append_arg(wszCommand, argv[i]);
		}
	}
#ifdef DEBUG
	fprintf(stderr, "extractbb-wrapper: debug: wszCommand=");
	WriteConsoleW(GetStdHandle(STD_ERROR_HANDLE), wszCommand, (DWORD)wcslen(wszCommand), NULL, NULL);
	fprintf(stderr, "\n");
#endif /* DEBUG */

	/* Execute xdvipdfmx */
	{
		STARTUPINFOW si = { 0 };
		PROCESS_INFORMATION pi = { 0 };
		DWORD dwExitCode = 0;

		si.cb = (DWORD)sizeof(si);

		if (!CreateProcessW(wszExePath, wszCommand, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi))
		{
			fprintf(stderr, "extractbb-wrapper: error: CreateProcessW failed (LastError=%d)\n", (int)GetLastError());
			return 1;
		}

		WaitForSingleObject(pi.hProcess, INFINITE);

		GetExitCodeProcess(pi.hProcess, &dwExitCode);

		CloseHandle(pi.hProcess);
		CloseHandle(pi.hThread);

		nRet = (int)dwExitCode;
	}
#ifdef DEBUG
	fprintf(stderr, "extractbb-wrapper: debug: nRet=%d\n", (int)nRet);
#endif /* DEBUG */

	return nRet;
}

static void append_arg(wchar_t *command, const wchar_t *arg)
{
	int arg_has_space = wcschr(arg, L' ') != NULL;
	int arg_has_quote = wcschr(arg, L'"') != NULL;
	if (arg_has_space || arg_has_quote)
	{
		wchar_t *p_cmd = command + wcslen(command);
		const wchar_t *p_arg = arg;
		size_t n = 0;

		*p_cmd = L' '; p_cmd++;
		if (arg_has_space)
		{
			*p_cmd = L'"'; p_cmd++;
		}

		while (*p_arg != L'\0')
		{
			if (*p_arg == L'"')
			{
				/* Double the '\\' that precedes the '"' */
				while (n > 0)
				{
					*p_cmd = L'\\'; p_cmd++;
					n--;
				}
				/* Escaping '"' */
				*p_cmd = L'\\'; p_cmd++;
			}
			else if (*p_arg == L'\\')
			{
				/* Count '\\' */
				n++;
			}
			else
			{
				/* reset '\\' count */
				n = 0;
			}
			*p_cmd = *p_arg;
			p_cmd++;
			p_arg++;
		}
		if (arg_has_space)
		{
			/* Double the '\\' that precedes the '"' */
			while (n > 0)
			{
				*p_cmd = L'\\'; p_cmd++;
				n--;
			}
			*p_cmd = L'"'; p_cmd++;
		}
		*p_cmd = L'\0';
	}
	else
	{
		wcscat(command, L" ");
		wcscat(command, arg);
	}
}