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