spawnvp.c revision 151498
1/* Copyright (C) 2004 2 Free Software Foundation, Inc. 3 Written by: Keith Marshall (keith.d.marshall@ntlworld.com) 4 5This file is part of groff. 6 7groff is free software; you can redistribute it and/or modify it under 8the terms of the GNU General Public License as published by the Free 9Software Foundation; either version 2, or (at your option) any later 10version. 11 12groff is distributed in the hope that it will be useful, but WITHOUT ANY 13WARRANTY; without even the implied warranty of MERCHANTABILITY or 14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15for more details. 16 17You should have received a copy of the GNU General Public License along 18with groff; see the file COPYING. If not, write to the Free Software 19Foundation, 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 53extern char *program_name; 54 55extern char *quote_arg(char *string); 56extern void purge_quoted_args(char **argv); 57 58int 59spawnvp_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 */ 123