// Copyright (C) 1999,2000 Bruce Guenter <bruceg@em.ca>

//

// This program is free software; you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation; either version 2 of the License, or

// (at your option) any later version.

//

// This program 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 General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with this program; if not, write to the Free Software

// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#include <config.h>

#include <errno.h>

#include <stdlib.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <unistd.h>

#include "exec.h"

#include "config/configrc.h"

int presetenv(const char* prefix, const mystring& value)

{

  unsigned plen = strlen(prefix);

  char* tmp = new char[plen+value.length()+1];

  strcpy(tmp, prefix);

  strcpy(tmp+plen, value.c_str());

  return putenv(tmp);

  // Note that tmp is never freed.  This was done as a result of problems

  // using putenv with glibc 2.1, where freeing the pointer passed to

  // putenv appeared to cause garbage to enter the environment.

  //mystring tmp = prefix + value;

  //return putenv(tmp.c_str());

}

int execute_one(const char* args[])

{

  int pid = fork();

  switch(pid) {

  case -1:

    return -1;

  case 0:

    execvp(args[0], (char**)args);

    exit(127);

  default:

    for(;;) {

      int status;

      if(waitpid(pid, &status, 0) == -1) {

	if(errno != EINTR)

	  return -1;

      } else {

	if(WIFEXITED(status))

	  return WEXITSTATUS(status);

	else

	  return -1;

      }

    }

  }

  return 0;

}

static int execute(const configuration* node, const mystring& name)

{

  if(node->parent) {

    int i = execute(node->parent, name);

    if(i || (node->parent->directory == node->directory))

      return i;

  }

  mystring path = node->directory + "/" + name;

  struct stat buf;

  if(stat(path.c_str(), &buf) != -1 && buf.st_mode & 0111) {

    const char* args[] = { path.c_str(), 0 };

    return execute_one(args);

  }

  else

    return 0;

}

int execute(const mystring& name)

{

  int i = execute(config, name);

  return (i == 99) ? 0 : i;

}