Mercurial > gnulib
annotate lib/w32spawn.h @ 30235:d2d89737e596
Enable use of shell scripts as executables in mingw.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Mon, 29 Sep 2008 15:13:25 +0200 |
| parents | 49d1cc4454bf |
| children | e70e12db795d |
| rev | line source |
|---|---|
| 24627 | 1 /* Auxiliary functions for the creation of subprocesses. Native Woe32 API. |
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30235
d2d89737e596
Enable use of shell scripts as executables in mingw.
Bruno Haible <bruno@clisp.org>
parents:
29000
diff
changeset
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2 Copyright (C) 2003, 2006-2008 Free Software Foundation, Inc. |
| 24627 | 3 Written by Bruno Haible <bruno@clisp.org>, 2003. |
| 4 | |
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Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
27635
diff
changeset
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5 This program is free software: you can redistribute it and/or modify |
| 24627 | 6 it under the terms of the GNU General Public License as published by |
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Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
27635
diff
changeset
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7 the Free Software Foundation; either version 3 of the License, or |
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49d1cc4454bf
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
27635
diff
changeset
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8 (at your option) any later version. |
| 24627 | 9 |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
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Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
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changeset
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 24627 | 17 |
| 18 /* Get declarations of the Win32 API functions. */ | |
| 19 #define WIN32_LEAN_AND_MEAN | |
| 20 #include <windows.h> | |
| 21 | |
| 22 /* Get _get_osfhandle() and _open_osfhandle(). */ | |
| 23 #include <io.h> | |
| 24 | |
| 25 #include <stdbool.h> | |
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* doc/gnulib-tool.texi (Initial import): Update to match current
Paul Eggert <eggert@cs.ucla.edu>
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26 #include <string.h> |
| 24627 | 27 #include <errno.h> |
| 28 | |
| 29 #include "xalloc.h" | |
| 30 | |
| 31 /* Duplicates a file handle, making the copy uninheritable. */ | |
| 32 static int | |
| 33 dup_noinherit (int fd) | |
| 34 { | |
| 35 HANDLE curr_process = GetCurrentProcess (); | |
| 36 HANDLE old_handle = (HANDLE) _get_osfhandle (fd); | |
| 37 HANDLE new_handle; | |
| 38 int nfd; | |
| 39 | |
| 40 if (!DuplicateHandle (curr_process, /* SourceProcessHandle */ | |
| 41 old_handle, /* SourceHandle */ | |
| 42 curr_process, /* TargetProcessHandle */ | |
| 43 (PHANDLE) &new_handle, /* TargetHandle */ | |
| 44 (DWORD) 0, /* DesiredAccess */ | |
| 45 FALSE, /* InheritHandle */ | |
| 46 DUPLICATE_SAME_ACCESS)) /* Options */ | |
| 47 error (EXIT_FAILURE, 0, _("DuplicateHandle failed with error code 0x%08x"), | |
| 48 GetLastError ()); | |
| 49 | |
| 50 nfd = _open_osfhandle ((long) new_handle, O_BINARY); | |
| 51 if (nfd < 0) | |
| 52 error (EXIT_FAILURE, errno, _("_open_osfhandle failed")); | |
| 53 | |
| 54 return nfd; | |
| 55 } | |
| 56 | |
| 57 /* Prepares an argument vector before calling spawn(). | |
| 58 Note that spawn() does not by itself call the command interpreter | |
| 59 (getenv ("COMSPEC") != NULL ? getenv ("COMSPEC") : | |
| 60 ({ OSVERSIONINFO v; v.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); | |
| 61 GetVersionEx(&v); | |
| 62 v.dwPlatformId == VER_PLATFORM_WIN32_NT; | |
| 63 }) ? "cmd.exe" : "command.com"). | |
| 64 Instead it simply concatenates the arguments, separated by ' ', and calls | |
| 65 CreateProcess(). We must quote the arguments since Win32 CreateProcess() | |
| 66 interprets characters like ' ', '\t', '\\', '"' (but not '<' and '>') in a | |
| 67 special way: | |
| 68 - Space and tab are interpreted as delimiters. They are not treated as | |
| 69 delimiters if they are surrounded by double quotes: "...". | |
| 70 - Unescaped double quotes are removed from the input. Their only effect is | |
| 71 that within double quotes, space and tab are treated like normal | |
| 72 characters. | |
| 73 - Backslashes not followed by double quotes are not special. | |
| 74 - But 2*n+1 backslashes followed by a double quote become | |
| 75 n backslashes followed by a double quote (n >= 0): | |
| 76 \" -> " | |
| 77 \\\" -> \" | |
| 78 \\\\\" -> \\" | |
| 79 */ | |
| 80 #define SHELL_SPECIAL_CHARS "\"\\ \001\002\003\004\005\006\007\010\011\012\013\014\015\016\017\020\021\022\023\024\025\026\027\030\031\032\033\034\035\036\037" | |
| 81 #define SHELL_SPACE_CHARS " \001\002\003\004\005\006\007\010\011\012\013\014\015\016\017\020\021\022\023\024\025\026\027\030\031\032\033\034\035\036\037" | |
| 82 static char ** | |
| 83 prepare_spawn (char **argv) | |
| 84 { | |
| 85 size_t argc; | |
| 86 char **new_argv; | |
| 87 size_t i; | |
| 88 | |
| 89 /* Count number of arguments. */ | |
| 90 for (argc = 0; argv[argc] != NULL; argc++) | |
| 91 ; | |
| 92 | |
| 93 /* Allocate new argument vector. */ | |
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30235
d2d89737e596
Enable use of shell scripts as executables in mingw.
Bruno Haible <bruno@clisp.org>
parents:
29000
diff
changeset
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94 new_argv = XNMALLOC (1 + argc + 1, char *); |
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d2d89737e596
Enable use of shell scripts as executables in mingw.
Bruno Haible <bruno@clisp.org>
parents:
29000
diff
changeset
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95 |
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Bruno Haible <bruno@clisp.org>
parents:
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96 /* Add an element upfront that can be used when argv[0] turns out to be a |
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d2d89737e596
Enable use of shell scripts as executables in mingw.
Bruno Haible <bruno@clisp.org>
parents:
29000
diff
changeset
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97 script, not a program. |
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d2d89737e596
Enable use of shell scripts as executables in mingw.
Bruno Haible <bruno@clisp.org>
parents:
29000
diff
changeset
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98 On Unix, this would be "/bin/sh". On native Windows, "sh" is actually |
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d2d89737e596
Enable use of shell scripts as executables in mingw.
Bruno Haible <bruno@clisp.org>
parents:
29000
diff
changeset
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99 "sh.exe". We have to omit the directory part and rely on the search in |
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d2d89737e596
Enable use of shell scripts as executables in mingw.
Bruno Haible <bruno@clisp.org>
parents:
29000
diff
changeset
|
100 PATH, because the mingw "mount points" are not visible inside Win32 |
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d2d89737e596
Enable use of shell scripts as executables in mingw.
Bruno Haible <bruno@clisp.org>
parents:
29000
diff
changeset
|
101 CreateProcess(). */ |
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d2d89737e596
Enable use of shell scripts as executables in mingw.
Bruno Haible <bruno@clisp.org>
parents:
29000
diff
changeset
|
102 *new_argv++ = "sh.exe"; |
| 24627 | 103 |
| 104 /* Put quoted arguments into the new argument vector. */ | |
| 105 for (i = 0; i < argc; i++) | |
| 106 { | |
| 107 const char *string = argv[i]; | |
| 108 | |
| 109 if (string[0] == '\0') | |
| 110 new_argv[i] = xstrdup ("\"\""); | |
| 111 else if (strpbrk (string, SHELL_SPECIAL_CHARS) != NULL) | |
| 112 { | |
| 113 bool quote_around = (strpbrk (string, SHELL_SPACE_CHARS) != NULL); | |
| 114 size_t length; | |
| 115 unsigned int backslashes; | |
| 116 const char *s; | |
| 117 char *quoted_string; | |
| 118 char *p; | |
| 119 | |
| 120 length = 0; | |
| 121 backslashes = 0; | |
| 122 if (quote_around) | |
| 123 length++; | |
| 124 for (s = string; *s != '\0'; s++) | |
| 125 { | |
| 126 char c = *s; | |
| 127 if (c == '"') | |
| 128 length += backslashes + 1; | |
| 129 length++; | |
| 130 if (c == '\\') | |
| 131 backslashes++; | |
| 132 else | |
| 133 backslashes = 0; | |
| 134 } | |
| 135 if (quote_around) | |
| 136 length += backslashes + 1; | |
| 137 | |
| 138 quoted_string = (char *) xmalloc (length + 1); | |
| 139 | |
| 140 p = quoted_string; | |
| 141 backslashes = 0; | |
| 142 if (quote_around) | |
| 143 *p++ = '"'; | |
| 144 for (s = string; *s != '\0'; s++) | |
| 145 { | |
| 146 char c = *s; | |
| 147 if (c == '"') | |
| 148 { | |
| 149 unsigned int j; | |
| 150 for (j = backslashes + 1; j > 0; j--) | |
| 151 *p++ = '\\'; | |
| 152 } | |
| 153 *p++ = c; | |
| 154 if (c == '\\') | |
| 155 backslashes++; | |
| 156 else | |
| 157 backslashes = 0; | |
| 158 } | |
| 159 if (quote_around) | |
| 160 { | |
| 161 unsigned int j; | |
| 162 for (j = backslashes; j > 0; j--) | |
| 163 *p++ = '\\'; | |
| 164 *p++ = '"'; | |
| 165 } | |
| 166 *p = '\0'; | |
| 167 | |
| 168 new_argv[i] = quoted_string; | |
| 169 } | |
| 170 else | |
| 171 new_argv[i] = (char *) string; | |
| 172 } | |
| 173 new_argv[argc] = NULL; | |
| 174 | |
| 175 return new_argv; | |
| 176 } |