-
Notifications
You must be signed in to change notification settings - Fork 54
/
AssembleCmdLine.h
228 lines (201 loc) · 5.75 KB
/
AssembleCmdLine.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 https://mozilla.org/MPL/2.0/. */
#ifndef mozilla_AssembleCmdLine_h
#define mozilla_AssembleCmdLine_h
#if defined(XP_WIN)
# include "mozilla/UniquePtr.h"
# include <stdlib.h>
# include <windows.h>
# ifdef MOZILLA_INTERNAL_API
# include "nsString.h"
# endif // MOZILLA_INTERNAL_API
namespace mozilla {
// Out param `aWideCmdLine` must be free()d by the caller.
inline int assembleCmdLine(const char* const* aArgv, wchar_t** aWideCmdLine,
UINT aCodePage) {
const char* const* arg;
char* p;
const char* q;
char* cmdLine;
int cmdLineSize;
int numBackslashes;
int i;
int argNeedQuotes;
/*
* Find out how large the command line buffer should be.
*/
cmdLineSize = 0;
for (arg = aArgv; *arg; ++arg) {
/*
* \ and " need to be escaped by a \. In the worst case,
* every character is a \ or ", so the string of length
* may double. If we quote an argument, that needs two ".
* Finally, we need a space between arguments, and
* a null byte at the end of command line.
*/
cmdLineSize += 2 * strlen(*arg) /* \ and " need to be escaped */
+ 2 /* we quote every argument */
+ 1; /* space in between, or final null */
}
p = cmdLine = (char*)malloc(cmdLineSize * sizeof(char));
if (!p) {
return -1;
}
for (arg = aArgv; *arg; ++arg) {
/* Add a space to separates the arguments */
if (arg != aArgv) {
*p++ = ' ';
}
q = *arg;
numBackslashes = 0;
argNeedQuotes = 0;
/* If the argument contains white space, it needs to be quoted. */
if (strpbrk(*arg, " \f\n\r\t\v")) {
argNeedQuotes = 1;
}
if (argNeedQuotes) {
*p++ = '"';
}
while (*q) {
if (*q == '\\') {
numBackslashes++;
q++;
} else if (*q == '"') {
if (numBackslashes) {
/*
* Double the backslashes since they are followed
* by a quote
*/
for (i = 0; i < 2 * numBackslashes; i++) {
*p++ = '\\';
}
numBackslashes = 0;
}
/* To escape the quote */
*p++ = '\\';
*p++ = *q++;
} else {
if (numBackslashes) {
/*
* Backslashes are not followed by a quote, so
* don't need to double the backslashes.
*/
for (i = 0; i < numBackslashes; i++) {
*p++ = '\\';
}
numBackslashes = 0;
}
*p++ = *q++;
}
}
/* Now we are at the end of this argument */
if (numBackslashes) {
/*
* Double the backslashes if we have a quote string
* delimiter at the end.
*/
if (argNeedQuotes) {
numBackslashes *= 2;
}
for (i = 0; i < numBackslashes; i++) {
*p++ = '\\';
}
}
if (argNeedQuotes) {
*p++ = '"';
}
}
*p = '\0';
int numChars = MultiByteToWideChar(aCodePage, 0, cmdLine, -1, nullptr, 0);
*aWideCmdLine = (wchar_t*)malloc(numChars * sizeof(wchar_t));
MultiByteToWideChar(aCodePage, 0, cmdLine, -1, *aWideCmdLine, numChars);
free(cmdLine);
return 0;
}
# ifdef MOZILLA_INTERNAL_API
inline UniquePtr<wchar_t[]> assembleSingleArgument(const nsString& aArg) {
static_assert(sizeof(char16_t) == sizeof(wchar_t),
"char16_t and wchar_t sizes differ");
/*
* \ and " need to be escaped by a \. In the worst case,
* every character is a \ or ", so the string of length
* may double. If we quote an argument, that needs two ".
* Finally, we need a space between arguments, and
* a null byte at the end of command line.
*/
int cmdLineSize = 2 * aArg.Length() /* \ and " need to be escaped */
+ 2 /* we quote every argument */
+ 1; /* space in between, or final null */
auto assembledArg = MakeUnique<wchar_t[]>(cmdLineSize);
if (!assembledArg) {
return nullptr;
}
/* If the argument contains white space, it needs to be quoted. */
int argNeedQuotes = 0;
if (aArg.FindCharInSet(u" \f\n\r\t\v") != kNotFound) {
argNeedQuotes = 1;
}
wchar_t* p = assembledArg.get();
if (argNeedQuotes) {
*p++ = '"';
}
const char16_t* q = aArg.get();
int numBackslashes = 0;
while (*q) {
if (*q == '\\') {
numBackslashes++;
q++;
} else if (*q == '"') {
if (numBackslashes) {
/*
* Double the backslashes since they are followed
* by a quote
*/
for (int i = 0; i < 2 * numBackslashes; i++) {
*p++ = '\\';
}
numBackslashes = 0;
}
/* To escape the quote */
*p++ = '\\';
*p++ = *q++;
} else {
if (numBackslashes) {
/*
* Backslashes are not followed by a quote, so
* don't need to double the backslashes.
*/
for (int i = 0; i < numBackslashes; i++) {
*p++ = '\\';
}
numBackslashes = 0;
}
*p++ = *q++;
}
}
/* Now we are at the end of this argument */
if (numBackslashes) {
/*
* Double the backslashes if we have a quote string
* delimiter at the end.
*/
if (argNeedQuotes) {
numBackslashes *= 2;
}
for (int i = 0; i < numBackslashes; i++) {
*p++ = '\\';
}
}
if (argNeedQuotes) {
*p++ = '"';
}
*p = '\0';
return assembledArg;
}
# endif // MOZILLA_INTERNAL_API
} // namespace mozilla
#endif // defined(XP_WIN)
#endif // mozilla_AssembleCmdLine_h