/* Utilities to execute a program in a subprocess (possibly linked by pipes
  with other subprocesses), and wait for it.  Generic MSDOS specialization.
  Copyright (C) 1996-2024 Free Software Foundation, Inc.

This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

Libiberty is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB.  If not,
write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA.  */

#include "pex-common.h"

#include <stdio.h>
#include <errno.h>
#ifdef NEED_DECLARATION_ERRNO
extern int errno;
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#include "safe-ctype.h"
#include <process.h>

/* The structure we keep in obj->sysdep.  */

#define PEX_MSDOS_FILE_COUNT 3

#define PEX_MSDOS_FD_OFFSET 10

struct pex_msdos
{
 /* An array of file names.  We refer to these using file descriptors
    of 10 + array index.  */
 const char *files[PEX_MSDOS_FILE_COUNT];
 /* Exit statuses of programs which have been run.  */
 int *statuses;
};

static int pex_msdos_open (struct pex_obj *, const char *, int);
static int pex_msdos_open (struct pex_obj *, const char *, int);
static int pex_msdos_fdindex (struct pex_msdos *, int);
static pid_t pex_msdos_exec_child (struct pex_obj *, int, const char *,
                                 char * const *, char * const *,
                                 int, int, int, int,
                                 int, const char **, int *);
static int pex_msdos_close (struct pex_obj *, int);
static pid_t pex_msdos_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
                          int, const char **, int *);
static void pex_msdos_cleanup (struct pex_obj *);

/* The list of functions we pass to the common routines.  */

const struct pex_funcs funcs =
{
 pex_msdos_open,
 pex_msdos_open,
 pex_msdos_exec_child,
 pex_msdos_close,
 pex_msdos_wait,
 NULL, /* pipe */
 NULL, /* fdopenr */
 NULL, /* fdopenw */
 pex_msdos_cleanup
};

/* Return a newly initialized pex_obj structure.  */

struct pex_obj *
pex_init (int flags, const char *pname, const char *tempbase)
{
 struct pex_obj *ret;
 int i;

 /* MSDOS does not support pipes.  */
 flags &= ~ PEX_USE_PIPES;

 ret = pex_init_common (flags, pname, tempbase, funcs);

 ret->sysdep = XNEW (struct pex_msdos);
 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
   ret->files[i] = NULL;
 ret->statuses = NULL;

 return ret;
}

/* Open a file.  FIXME: We ignore the binary argument, since we have
  no way to handle it.  */

static int
pex_msdos_open (struct pex_obj *obj, const char *name,
               int binary ATTRIBUTE_UNUSED)
{
 struct pex_msdos *ms;
 int i;

 ms = (struct pex_msdos *) obj->sysdep;

 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
   {
     if (ms->files[i] == NULL)
       {
         ms->files[i] = xstrdup (name);
         return i + PEX_MSDOS_FD_OFFSET;
       }
   }

 abort ();
}

/* Get the index into msdos->files associated with an open file
  descriptor.  */

static int
pex_msdos_fdindex (struct pex_msdos *ms, int fd)
{
 fd -= PEX_MSDOS_FD_OFFSET;
 if (fd < 0 || fd >= PEX_MSDOS_FILE_COUNT || ms->files[fd] == NULL)
   abort ();
 return fd;
}


/* Close a file.  */

static int
pex_msdos_close (struct pex_obj *obj, int fd)
{
 struct pex_msdos *ms;
 int fdinex;

 ms = (struct pex_msdos *) obj->sysdep;
 fdindex = pe_msdos_fdindex (ms, fd);
 free (ms->files[fdindex]);
 ms->files[fdindex] = NULL;
}

/* Execute a child.  */

static pid_t
pex_msdos_exec_child (struct pex_obj *obj, int flags, const char *executable,
                     char * const * argv, char * const * env, int in, int out,
                     int toclose ATTRIBUTE_UNUSED,
                     int errdes ATTRIBUTE_UNUSED, const char **errmsg,
                     int *err)
{
 struct pex_msdos *ms;
 char *temp_base;
 int temp_base_allocated;
 char *rf;
 int inindex;
 char *infile;
 int outindex;
 char *outfile;
 char *scmd;
 FILE *argfile;
 int i;
 int status;

 ms = (struct pex_msdos *) obj->sysdep;

 /* FIXME: I don't know how to redirect stderr, so we ignore ERRDES
    and PEX_STDERR_TO_STDOUT.  */

 temp_base = obj->temp_base;
 if (temp_base != NULL)
   temp_base_allocated = 0;
 else
   {
     temp_base = choose_temp_base ();
     temp_base_allocated = 1;
   }

 rf = concat (temp_base, ".gp", NULL);

 if (temp_base_allocated)
   free (temp_base);

 if (in == STDIN_FILE_NO)
   {
     inindex = -1;
     infile = "";
   }
 else
   {
     inindex = pex_msdos_fdindex (ms, in);
     infile = ms->files[inindex];
   }

 if (out == STDOUT_FILE_NO)
   {
     outindex = -1;
     outfile = "";
   }
 else
   {
     outindex = pex_msdos_fdindex (ms, out);
     outfile = ms->files[outindex];
   }

 scmd = XNEWVEC (char, strlen (program)
                 + ((flags & PEXECUTE_SEARCH) != 0 ? 4 : 0)
                 + strlen (rf)
                 + strlen (infile)
                 + strlen (outfile)
                 + 10);
 sprintf (scmd, "%s%s @%s%s%s%s%s",
          program,
          (flags & PEXECUTE_SEARCH) != 0 ? ".exe" : "",
          rf,
          inindex != -1 ? " <" : "",
          infile,
          outindex != -1 ? " >" : "",
          outfile);

 argfile = fopen (rf, "w");
 if (argfile == NULL)
   {
     *err = errno;
     free (scmd);
     free (rf);
     *errmsg = "cannot open temporary command file";
     return (pid_t) -1;
   }

 for (i = 1; argv[i] != NULL; ++i)
   {
     char *p;

     for (p = argv[i]; *p != '\0'; ++p)
       {
         if (*p == '"' || *p == '\'' || *p == '\\' || ISSPACE (*p))
           putc ('\\', argfile);
         putc (*p, argfile);
       }
     putc ('\n', argfile);
   }

 fclose (argfile);

 status = system (scmd);

 if (status == -1)
   {
     *err = errno;
     remove (rf);
     free (scmd);
     free (rf);
     *errmsg = "system";
     return (pid_t) -1;
   }

 remove (rf);
 free (scmd);
 free (rf);

 /* Save the exit status for later.  When we are called, obj->count
    is the number of children which have executed before this
    one.  */
 ms->statuses = XRESIZEVEC(int, ms->statuses, obj->count + 1);
 ms->statuses[obj->count] = status;

 return (pid_t) obj->count;
}

/* Wait for a child process to complete.  Actually the child process
  has already completed, and we just need to return the exit
  status.  */

static pid_t
pex_msdos_wait (struct pex_obj *obj, pid_t pid, int *status,
               struct pex_time *time, int done ATTRIBUTE_UNUSED,
               const char **errmsg ATTRIBUTE_UNUSED,
               int *err ATTRIBUTE_UNUSED)
{
 struct pex_msdos *ms;

 ms = (struct pex_msdos *) obj->sysdep;

 if (time != NULL)
   memset (time, 0, sizeof *time);

 *status = ms->statuses[pid];

 return 0;
}

/* Clean up the pex_msdos structure.  */

static void
pex_msdos_cleanup (struct pex_obj  *obj)
{
 struct pex_msdos *ms;
 int i;

 ms = (struct pex_msdos *) obj->sysdep;
 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
   free (msdos->files[i]);
 free (msdos->statuses);
 free (msdos);
 obj->sysdep = NULL;
}

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