/* environ.c -- library for manipulating environments for GNU.
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/* environ.c -- library for manipulating environments for GNU.
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Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 2000, 2005
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Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 2000, 2005
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2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#define min(a, b) ((a) < (b) ? (a) : (b))
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#define min(a, b) ((a) < (b) ? (a) : (b))
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#define max(a, b) ((a) > (b) ? (a) : (b))
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#define max(a, b) ((a) > (b) ? (a) : (b))
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#include "defs.h"
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#include "defs.h"
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#include "environ.h"
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#include "environ.h"
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#include "gdb_string.h"
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#include "gdb_string.h"
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/* Return a new environment object. */
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/* Return a new environment object. */
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struct gdb_environ *
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struct gdb_environ *
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make_environ (void)
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make_environ (void)
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{
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{
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struct gdb_environ *e;
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struct gdb_environ *e;
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e = (struct gdb_environ *) xmalloc (sizeof (struct gdb_environ));
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e = (struct gdb_environ *) xmalloc (sizeof (struct gdb_environ));
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e->allocated = 10;
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e->allocated = 10;
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e->vector = (char **) xmalloc ((e->allocated + 1) * sizeof (char *));
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e->vector = (char **) xmalloc ((e->allocated + 1) * sizeof (char *));
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e->vector[0] = 0;
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e->vector[0] = 0;
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return e;
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return e;
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}
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}
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/* Free an environment and all the strings in it. */
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/* Free an environment and all the strings in it. */
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void
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void
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free_environ (struct gdb_environ *e)
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free_environ (struct gdb_environ *e)
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{
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{
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char **vector = e->vector;
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char **vector = e->vector;
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while (*vector)
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while (*vector)
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xfree (*vector++);
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xfree (*vector++);
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xfree (e->vector);
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xfree (e->vector);
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xfree (e);
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xfree (e);
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}
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}
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/* Copy the environment given to this process into E.
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/* Copy the environment given to this process into E.
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Also copies all the strings in it, so we can be sure
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Also copies all the strings in it, so we can be sure
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that all strings in these environments are safe to free. */
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that all strings in these environments are safe to free. */
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void
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void
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init_environ (struct gdb_environ *e)
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init_environ (struct gdb_environ *e)
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{
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{
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extern char **environ;
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extern char **environ;
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int i;
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int i;
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if (environ == NULL)
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if (environ == NULL)
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return;
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return;
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for (i = 0; environ[i]; i++) /*EMPTY */ ;
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for (i = 0; environ[i]; i++) /*EMPTY */ ;
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if (e->allocated < i)
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if (e->allocated < i)
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{
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{
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e->allocated = max (i, e->allocated + 10);
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e->allocated = max (i, e->allocated + 10);
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e->vector = (char **) xrealloc ((char *) e->vector,
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e->vector = (char **) xrealloc ((char *) e->vector,
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(e->allocated + 1) * sizeof (char *));
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(e->allocated + 1) * sizeof (char *));
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}
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}
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memcpy (e->vector, environ, (i + 1) * sizeof (char *));
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memcpy (e->vector, environ, (i + 1) * sizeof (char *));
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while (--i >= 0)
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while (--i >= 0)
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{
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{
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int len = strlen (e->vector[i]);
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int len = strlen (e->vector[i]);
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char *new = (char *) xmalloc (len + 1);
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char *new = (char *) xmalloc (len + 1);
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memcpy (new, e->vector[i], len + 1);
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memcpy (new, e->vector[i], len + 1);
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e->vector[i] = new;
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e->vector[i] = new;
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}
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}
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}
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}
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/* Return the vector of environment E.
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/* Return the vector of environment E.
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This is used to get something to pass to execve. */
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This is used to get something to pass to execve. */
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char **
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char **
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environ_vector (struct gdb_environ *e)
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environ_vector (struct gdb_environ *e)
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{
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{
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return e->vector;
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return e->vector;
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}
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}
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/* Return the value in environment E of variable VAR. */
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/* Return the value in environment E of variable VAR. */
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char *
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char *
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get_in_environ (const struct gdb_environ *e, const char *var)
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get_in_environ (const struct gdb_environ *e, const char *var)
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{
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{
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int len = strlen (var);
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int len = strlen (var);
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char **vector = e->vector;
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char **vector = e->vector;
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char *s;
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char *s;
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for (; (s = *vector) != NULL; vector++)
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for (; (s = *vector) != NULL; vector++)
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if (strncmp (s, var, len) == 0 && s[len] == '=')
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if (strncmp (s, var, len) == 0 && s[len] == '=')
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return &s[len + 1];
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return &s[len + 1];
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return 0;
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return 0;
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}
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}
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/* Store the value in E of VAR as VALUE. */
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/* Store the value in E of VAR as VALUE. */
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void
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void
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set_in_environ (struct gdb_environ *e, const char *var, const char *value)
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set_in_environ (struct gdb_environ *e, const char *var, const char *value)
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{
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{
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int i;
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int i;
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int len = strlen (var);
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int len = strlen (var);
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char **vector = e->vector;
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char **vector = e->vector;
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char *s;
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char *s;
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for (i = 0; (s = vector[i]) != NULL; i++)
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for (i = 0; (s = vector[i]) != NULL; i++)
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if (strncmp (s, var, len) == 0 && s[len] == '=')
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if (strncmp (s, var, len) == 0 && s[len] == '=')
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break;
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break;
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if (s == 0)
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if (s == 0)
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{
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{
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if (i == e->allocated)
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if (i == e->allocated)
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{
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{
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e->allocated += 10;
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e->allocated += 10;
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vector = (char **) xrealloc ((char *) vector,
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vector = (char **) xrealloc ((char *) vector,
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(e->allocated + 1) * sizeof (char *));
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(e->allocated + 1) * sizeof (char *));
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e->vector = vector;
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e->vector = vector;
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}
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}
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vector[i + 1] = 0;
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vector[i + 1] = 0;
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}
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}
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else
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else
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xfree (s);
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xfree (s);
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s = (char *) xmalloc (len + strlen (value) + 2);
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s = (char *) xmalloc (len + strlen (value) + 2);
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strcpy (s, var);
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strcpy (s, var);
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strcat (s, "=");
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strcat (s, "=");
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strcat (s, value);
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strcat (s, value);
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vector[i] = s;
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vector[i] = s;
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/* This used to handle setting the PATH and GNUTARGET variables
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/* This used to handle setting the PATH and GNUTARGET variables
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specially. The latter has been replaced by "set gnutarget"
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specially. The latter has been replaced by "set gnutarget"
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(which has worked since GDB 4.11). The former affects searching
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(which has worked since GDB 4.11). The former affects searching
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the PATH to find SHELL, and searching the PATH to find the
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the PATH to find SHELL, and searching the PATH to find the
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argument of "symbol-file" or "exec-file". Maybe we should have
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argument of "symbol-file" or "exec-file". Maybe we should have
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some kind of "set exec-path" for that. But in any event, having
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some kind of "set exec-path" for that. But in any event, having
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"set env" affect anything besides the inferior is a bad idea.
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"set env" affect anything besides the inferior is a bad idea.
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What if we want to change the environment we pass to the program
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What if we want to change the environment we pass to the program
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without afecting GDB's behavior? */
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without afecting GDB's behavior? */
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return;
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return;
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}
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}
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/* Remove the setting for variable VAR from environment E. */
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/* Remove the setting for variable VAR from environment E. */
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void
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void
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unset_in_environ (struct gdb_environ *e, char *var)
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unset_in_environ (struct gdb_environ *e, char *var)
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{
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{
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int len = strlen (var);
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int len = strlen (var);
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char **vector = e->vector;
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char **vector = e->vector;
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char *s;
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char *s;
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for (; (s = *vector) != NULL; vector++)
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for (; (s = *vector) != NULL; vector++)
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{
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{
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if (strncmp (s, var, len) == 0 && s[len] == '=')
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if (strncmp (s, var, len) == 0 && s[len] == '=')
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{
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{
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xfree (s);
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xfree (s);
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/* Walk through the vector, shuffling args down by one, including
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/* Walk through the vector, shuffling args down by one, including
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the NULL terminator. Can't use memcpy() here since the regions
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the NULL terminator. Can't use memcpy() here since the regions
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overlap, and memmove() might not be available. */
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overlap, and memmove() might not be available. */
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while ((vector[0] = vector[1]) != NULL)
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while ((vector[0] = vector[1]) != NULL)
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{
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{
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vector++;
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vector++;
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}
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}
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break;
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break;
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}
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}
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}
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}
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}
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}
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