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/* environ.c -- library for manipulating environments for GNU.

   Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 2000, 2005

   2003, 2007, 2008 Free Software Foundation, Inc.

   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 3 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, see <http://www.gnu.org/licenses/>.  */

#define min(a, b) ((a) < (b) ? (a) : (b))

#define max(a, b) ((a) > (b) ? (a) : (b))

#include "defs.h"

#include "environ.h"

#include "gdb_string.h"

/* Return a new environment object.  */

struct gdb_environ *

make_environ (void)

{

  struct gdb_environ *e;

  e = (struct gdb_environ *) xmalloc (sizeof (struct gdb_environ));

  e->allocated = 10;

  e->vector = (char **) xmalloc ((e->allocated + 1) * sizeof (char *));

  e->vector[0] = 0;

  return e;

}

/* Free an environment and all the strings in it.  */

void

free_environ (struct gdb_environ *e)

{

  char **vector = e->vector;

  while (*vector)

    xfree (*vector++);

  xfree (e);

}

/* Copy the environment given to this process into E.

   Also copies all the strings in it, so we can be sure

   that all strings in these environments are safe to free.  */

void

init_environ (struct gdb_environ *e)

{

  extern char **environ;

  int i;

  if (environ == NULL)

    return;

  for (i = 0; environ[i]; i++) /*EMPTY */ ;

  if (e->allocated < i)

    {

      e->allocated = max (i, e->allocated + 10);

      e->vector = (char **) xrealloc ((char *) e->vector,

                                      (e->allocated + 1) * sizeof (char *));

    }

  memcpy (e->vector, environ, (i + 1) * sizeof (char *));

  while (--i >= 0)

    {

      int len = strlen (e->vector[i]);

      char *new = (char *) xmalloc (len + 1);

      memcpy (new, e->vector[i], len + 1);

      e->vector[i] = new;

    }

}

/* Return the vector of environment E.

   This is used to get something to pass to execve.  */

char **

environ_vector (struct gdb_environ *e)

{

  return e->vector;

}

/* Return the value in environment E of variable VAR.  */

char *

get_in_environ (const struct gdb_environ *e, const char *var)

{

  int len = strlen (var);

  char **vector = e->vector;

  char *s;

  for (; (s = *vector) != NULL; vector++)

    if (strncmp (s, var, len) == 0 && s[len] == '=')

      return &s[len + 1];

  return 0;

}

/* Store the value in E of VAR as VALUE.  */

void

set_in_environ (struct gdb_environ *e, const char *var, const char *value)

{

  int i;

  int len = strlen (var);

  char **vector = e->vector;

  char *s;

  for (i = 0; (s = vector[i]) != NULL; i++)

    if (strncmp (s, var, len) == 0 && s[len] == '=')

      break;

  if (s == 0)

    {

      if (i == e->allocated)

        {

          e->allocated += 10;

          vector = (char **) xrealloc ((char *) vector,

                                       (e->allocated + 1) * sizeof (char *));

          e->vector = vector;

        }

      vector[i + 1] = 0;

    }

  else

    xfree (s);

  s = (char *) xmalloc (len + strlen (value) + 2);

  strcpy (s, var);

  strcat (s, "=");

  strcat (s, value);

  vector[i] = s;

  /* This used to handle setting the PATH and GNUTARGET variables

     specially.  The latter has been replaced by "set gnutarget"

     (which has worked since GDB 4.11).  The former affects searching

     the PATH to find SHELL, and searching the PATH to find the

     argument of "symbol-file" or "exec-file".  Maybe we should have

     some kind of "set exec-path" for that.  But in any event, having

     "set env" affect anything besides the inferior is a bad idea.

     What if we want to change the environment we pass to the program

     without afecting GDB's behavior?  */

  return;

}

/* Remove the setting for variable VAR from environment E.  */

void

unset_in_environ (struct gdb_environ *e, char *var)

{

  int len = strlen (var);

  char **vector = e->vector;

  char *s;

  for (; (s = *vector) != NULL; vector++)

    {

      if (strncmp (s, var, len) == 0 && s[len] == '=')

        {

          xfree (s);

          /* Walk through the vector, shuffling args down by one, including

             the NULL terminator.  Can't use memcpy() here since the regions

             overlap, and memmove() might not be available. */

          while ((vector[0] = vector[1]) != NULL)

            {

              vector++;

            }

          break;

        }

    }

}