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annotate PC/w9xpopen.c @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents 6bea2f1351b1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * w9xpopen.c
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3 *
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4 * Serves as an intermediate stub Win32 console application to
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5 * avoid a hanging pipe when redirecting 16-bit console based
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6 * programs (including MS-DOS console based programs and batch
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7 * files) on Window 95 and Windows 98.
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8 *
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9 * This program is to be launched with redirected standard
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10 * handles. It will launch the command line specified 16-bit
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11 * console based application in the same console, forwarding
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4adbd331d335 Fix all wrong instances of "it's".
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12 * its own redirected standard handles to the 16-bit child.
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13
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14 * AKA solution to the problem described in KB: Q150956.
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15 */
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16
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17 #define WIN32_LEAN_AND_MEAN
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18 #include <windows.h>
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19 #include <stdio.h>
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20 #include <stdlib.h> /* for malloc and its friends */
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21
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22 const char *usage =
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f3677414bc3d Fix grammar
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23 "This program is used by Python's os.popen function\n"
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24 "to work around a limitation in Windows 95/98. It is\n"
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25 "not designed to be used as a stand-alone program.";
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26
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27 int main(int argc, char *argv[])
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28 {
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29 BOOL bRet;
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30 STARTUPINFO si;
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31 PROCESS_INFORMATION pi;
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32 DWORD exit_code=0;
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33 size_t cmdlen = 0;
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34 int i;
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35 char *cmdline, *cmdlinefill;
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36
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37 if (argc < 2) {
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38 if (GetFileType(GetStdHandle(STD_INPUT_HANDLE))==FILE_TYPE_CHAR)
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39 /* Attached to a console, and therefore not executed by Python
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40 Display a message box for the inquisitive user
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41 */
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42 MessageBox(NULL, usage, argv[0], MB_OK);
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43 else {
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44 /* Eeek - executed by Python, but args are screwed!
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45 Write an error message to stdout so there is at
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46 least some clue for the end user when it appears
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47 in their output.
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48 A message box would be hidden and blocks the app.
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49 */
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50 fprintf(stdout, "Internal popen error - no args specified\n%s\n", usage);
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51 }
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52 return 1;
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53 }
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54 /* Build up the command-line from the args.
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55 Args with a space are quoted, existing quotes are escaped.
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56 To keep things simple calculating the buffer size, we assume
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57 every character is a quote - ie, we allocate double what we need
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58 in the worst case. As this is only double the command line passed
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59 to us, there is a good chance this is reasonably small, so the total
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60 allocation will almost always be < 512 bytes.
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61 */
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62 for (i=1;i<argc;i++)
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63 cmdlen += strlen(argv[i])*2 + 3; /* one space, maybe 2 quotes */
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64 cmdline = cmdlinefill = (char *)malloc(cmdlen+1);
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65 if (cmdline == NULL)
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66 return -1;
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67 for (i=1;i<argc;i++) {
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68 const char *arglook;
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69 int bQuote = strchr(argv[i], ' ') != NULL;
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70 if (bQuote)
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71 *cmdlinefill++ = '"';
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72 /* escape quotes */
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73 for (arglook=argv[i];*arglook;arglook++) {
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74 if (*arglook=='"')
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75 *cmdlinefill++ = '\\';
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76 *cmdlinefill++ = *arglook;
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77 }
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78 if (bQuote)
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79 *cmdlinefill++ = '"';
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80 *cmdlinefill++ = ' ';
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81 }
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82 *cmdlinefill = '\0';
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83
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84 /* Make child process use this app's standard files. */
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85 ZeroMemory(&si, sizeof si);
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86 si.cb = sizeof si;
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87 si.dwFlags = STARTF_USESTDHANDLES;
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88 si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
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89 si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
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90 si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
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91
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92 bRet = CreateProcess(
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93 NULL, cmdline,
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94 NULL, NULL,
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95 TRUE, 0,
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96 NULL, NULL,
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97 &si, &pi
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98 );
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99
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100 free(cmdline);
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101
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102 if (bRet) {
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103 if (WaitForSingleObject(pi.hProcess, INFINITE) != WAIT_FAILED) {
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104 GetExitCodeProcess(pi.hProcess, &exit_code);
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105 }
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106 CloseHandle(pi.hProcess);
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107 CloseHandle(pi.hThread);
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108 return exit_code;
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109 }
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110
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111 return 1;
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112 }