src/libs/libgroff/spawnvp.c

   1 /* Copyright (C) 2004
   2    Free Software Foundation, Inc.
   3      Written by: Keith Marshall (keith.d.marshall@ntlworld.com)
   4
   5 This file is part of groff.
   6
   7 groff is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License along
  18 with groff; see the file COPYING.  If not, write to the Free Software
  19 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include "config.h"
  23 #endif
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27
  28 #ifdef HAVE_PROCESS_H
  29 # include <process.h>
  30 #endif
  31
  32 #if defined(__MSDOS__) \
  33     || (defined(_WIN32) && !defined(_UWIN) && !defined(__CYGWIN__)) \
  34     || defined(__EMX__)
  35
  36 #define SPAWN_FUNCTION_WRAPPERS 1
  37
  38 /* Define the default mechanism, and messages, for error reporting
  39  * (user may substitute a preferred alternative, by defining his own
  40  *  implementation of the macros REPORT_ERROR and ARGV_MALLOC_ERROR,
  41  *  in the header file `nonposix.h').
  42  */
  43
  44 #include "nonposix.h"
  45
  46 #ifndef  REPORT_ERROR
  47 # define REPORT_ERROR(WHY)  fprintf(stderr, "%s:%s\n", program_name, WHY)
  48 #endif
  49 #ifndef  ARGV_MALLOC_ERROR
  50 # define ARGV_MALLOC_ERROR    "malloc: Allocation for 'argv' failed"
  51 #endif
  52
  53 extern char *program_name;
  54
  55 extern char *quote_arg(char *string);
  56 extern void purge_quoted_args(char **argv);
  57
  58 int
  59 spawnvp_wrapper(int mode, char *path, char **argv)
  60 {
  61   /* Invoke the system `spawnvp' service
  62    * enclosing the passed arguments in double quotes, as required,
  63    * so that the (broken) default parsing in the MSVC runtime doesn't
  64    * split them at whitespace. */
  65
  66   char **quoted_argv;   /* used to build a quoted local copy of `argv' */
  67
  68   int i;                /* used as an index into `argv' or `quoted_argv' */
  69   int status = -1;      /* initialise return code, in case we fail */
  70   int argc = 0;         /* initialise argument count; may be none  */
  71
  72   /* First count the number of arguments
  73    * which are actually present in the passed `argv'. */
  74
  75   if (argv)
  76     for (quoted_argv = argv; *quoted_argv; ++argc, ++quoted_argv)
  77       ;
  78
  79   /* If we do not now have an argument count,
  80    * then we must fall through and fail. */
  81
  82   if (argc) {
  83     /* We do have at least one argument:
  84      * We will use a copy of the `argv', in which to do the quoting,
  85      * so we must allocate space for it. */
  86
  87     if ((quoted_argv = (char **)malloc(++argc * sizeof(char **))) == NULL) {
  88       /* If we didn't get enough space,
  89        * then complain, and bail out gracefully. */
  90
  91       REPORT_ERROR(ARGV_MALLOC_ERROR);
  92       exit(1);
  93     }
  94
  95     /* Now copy the passed `argv' into our new vector,
  96      * quoting its contents as required. */
  97
  98     for (i = 0; i < argc; i++)
  99       quoted_argv[i] = quote_arg(argv[i]);
 100
 101     /* Invoke the MSVC `spawnvp' service
 102      * passing our now appropriately quoted copy of `argv'. */
 103
 104     status = spawnvp(mode, path, quoted_argv);
 105
 106     /* Clean up our memory allocations
 107      * for the quoted copy of `argv', which is no longer required. */
 108
 109     purge_quoted_args(quoted_argv);
 110     free(quoted_argv);
 111   }
 112
 113   /* Finally,
 114    * return the status code returned by `spawnvp',
 115    * or a failure code if we fell through. */
 116
 117   return status;
 118 }
 119
 120 #endif  /* __MSDOS__ || _WIN32 */
 121
 122 /* spawnvp.c: end of file */