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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:expandtab:shiftwidth=2:tabstop=8:
*/
/* vim:set ts=8 sw=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "RemoteUtils.h"
#ifdef IS_BIG_ENDIAN
# define TO_LITTLE_ENDIAN32(x) \
((((x)&0xff000000) >> 24) | (((x)&0x00ff0000) >> 8) | \
(((x)&0x0000ff00) << 8) | (((x)&0x000000ff) << 24))
#else
# define TO_LITTLE_ENDIAN32(x) (x)
#endif
#ifndef MAX_PATH
# ifdef PATH_MAX
# define MAX_PATH PATH_MAX
# else
# define MAX_PATH 1024
# endif
#endif
/* like strcpy, but return the char after the final null */
static char* estrcpy(const char* s, char* d) {
while (*s) *d++ = *s++;
*d++ = '\0';
return d;
}
/* Construct a command line from given args and desktop startup ID.
* Returned buffer must be released by free().
*/
char* ConstructCommandLine(int32_t argc, char** argv, const char* aStartupToken,
int* aCommandLineLength) {
char cwdbuf[MAX_PATH];
if (!getcwd(cwdbuf, MAX_PATH)) return nullptr;
// the commandline property is constructed as an array of int32_t
// followed by a series of null-terminated strings:
//
// [argc][offsetargv0][offsetargv1...]<workingdir>\0<argv[0]>\0argv[1]...\0
// (offset is from the beginning of the buffer)
static char startupTokenPrefix[] = " STARTUP_TOKEN=";
int32_t argvlen = strlen(cwdbuf);
for (int i = 0; i < argc; ++i) {
int32_t len = strlen(argv[i]);
if (i == 0 && aStartupToken) {
len += sizeof(startupTokenPrefix) - 1 + strlen(aStartupToken);
}
argvlen += len;
}
auto* buffer =
(int32_t*)malloc(argvlen + argc + 1 + sizeof(int32_t) * (argc + 1));
if (!buffer) return nullptr;
buffer[0] = TO_LITTLE_ENDIAN32(argc);
auto* bufend = (char*)(buffer + argc + 1);
bufend = estrcpy(cwdbuf, bufend);
for (int i = 0; i < argc; ++i) {
buffer[i + 1] = TO_LITTLE_ENDIAN32(bufend - ((char*)buffer));
bufend = estrcpy(argv[i], bufend);
if (i == 0 && aStartupToken) {
bufend = estrcpy(startupTokenPrefix, bufend - 1);
bufend = estrcpy(aStartupToken, bufend - 1);
}
}
#ifdef DEBUG_command_line
int32_t debug_argc = TO_LITTLE_ENDIAN32(*buffer);
char* debug_workingdir = (char*)(buffer + argc + 1);
printf(
"Sending command line:\n"
" working dir: %s\n"
" argc:\t%i",
debug_workingdir, debug_argc);
int32_t* debug_offset = buffer + 1;
for (int debug_i = 0; debug_i < debug_argc; ++debug_i)
printf(" argv[%i]:\t%s\n", debug_i,
((char*)buffer) + TO_LITTLE_ENDIAN32(debug_offset[debug_i]));
#endif
*aCommandLineLength = bufend - reinterpret_cast<char*>(buffer);
return reinterpret_cast<char*>(buffer);
}
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