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authorgdb-2.4+.aux.coff <gdb@fsf.org>1988-01-16 04:39:57 +0000
committerPedro Alves <palves@redhat.com>2012-06-03 15:36:30 +0100
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+/* environ.c -- library for manipulating environments for GNU.
+ Copyright (C) 1986 Free Software Foundation, Inc.
+
+ NO WARRANTY
+
+ BECAUSE THIS PROGRAM IS LICENSED FREE OF CHARGE, WE PROVIDE ABSOLUTELY
+NO WARRANTY, TO THE EXTENT PERMITTED BY APPLICABLE STATE LAW. EXCEPT
+WHEN OTHERWISE STATED IN WRITING, FREE SOFTWARE FOUNDATION, INC,
+RICHARD M. STALLMAN AND/OR OTHER PARTIES PROVIDE THIS PROGRAM "AS IS"
+WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY
+AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
+DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
+CORRECTION.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW WILL RICHARD M.
+STALLMAN, THE FREE SOFTWARE FOUNDATION, INC., AND/OR ANY OTHER PARTY
+WHO MAY MODIFY AND REDISTRIBUTE THIS PROGRAM AS PERMITTED BELOW, BE
+LIABLE TO YOU FOR DAMAGES, INCLUDING ANY LOST PROFITS, LOST MONIES, OR
+OTHER SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR
+DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY THIRD PARTIES OR
+A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS) THIS
+PROGRAM, EVEN IF YOU HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY.
+
+ GENERAL PUBLIC LICENSE TO COPY
+
+ 1. You may copy and distribute verbatim copies of this source file
+as you receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy a valid copyright notice "Copyright
+(C) 1986 Free Software Foundation, Inc."; and include following the
+copyright notice a verbatim copy of the above disclaimer of warranty
+and of this License. You may charge a distribution fee for the
+physical act of transferring a copy.
+
+ 2. You may modify your copy or copies of this source file or
+any portion of it, and copy and distribute such modifications under
+the terms of Paragraph 1 above, provided that you also do the following:
+
+ a) cause the modified files to carry prominent notices stating
+ that you changed the files and the date of any change; and
+
+ b) cause the whole of any work that you distribute or publish,
+ that in whole or in part contains or is a derivative of this
+ program or any part thereof, to be licensed at no charge to all
+ third parties on terms identical to those contained in this
+ License Agreement (except that you may choose to grant more
+ extensive warranty protection to third parties, at your option).
+
+ c) You may charge a distribution fee for the physical act of
+ transferring a copy, and you may at your option offer warranty
+ protection in exchange for a fee.
+
+ 3. You may copy and distribute this program or any portion of it in
+compiled, executable or object code form under the terms of Paragraphs
+1 and 2 above provided that you do the following:
+
+ a) cause each such copy to be accompanied by the
+ corresponding machine-readable source code, which must
+ be distributed under the terms of Paragraphs 1 and 2 above; or,
+
+ b) cause each such copy to be accompanied by a
+ written offer, with no time limit, to give any third party
+ free (except for a nominal shipping charge) a machine readable
+ copy of the corresponding source code, to be distributed
+ under the terms of Paragraphs 1 and 2 above; or,
+
+ c) in the case of a recipient of this program in compiled, executable
+ or object code form (without the corresponding source code) you
+ shall cause copies you distribute to be accompanied by a copy
+ of the written offer of source code which you received along
+ with the copy you received.
+
+ 4. You may not copy, sublicense, distribute or transfer this program
+except as expressly provided under this License Agreement. Any attempt
+otherwise to copy, sublicense, distribute or transfer this program is void and
+your rights to use the program under this License agreement shall be
+automatically terminated. However, parties who have received computer
+software programs from you with this License Agreement will not have
+their licenses terminated so long as such parties remain in full compliance.
+
+ 5. If you wish to incorporate parts of this program into other free
+programs whose distribution conditions are different, write to the Free
+Software Foundation at 675 Mass Ave, Cambridge, MA 02139. We have not yet
+worked out a simple rule that can be stated here, but we will often permit
+this. We will be guided by the two goals of preserving the free status of
+all derivatives of our free software and of promoting the sharing and reuse of
+software.
+
+In other words, feel free to share this program, but don't try to
+stop anyone else from sharing it. */
+
+#define min(a, b) ((a) < (b) ? (a) : (b))
+#define max(a, b) ((a) > (b) ? (a) : (b))
+
+#include "environ.h"
+
+/* Return a new environment object. */
+
+struct environ *
+make_environ ()
+{
+ register struct environ *e;
+
+ e = (struct environ *) xmalloc (sizeof (struct 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 (e)
+ register struct environ *e;
+{
+ register char **vector = e->vector;
+
+ while (*vector)
+ free (*vector++);
+
+ free (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 (e)
+ register struct environ *e;
+{
+ extern char **environ;
+ register int i;
+
+ for (i = 0; environ[i]; i++);
+
+ if (e->allocated < i)
+ {
+ e->allocated = max (i, e->allocated + 10);
+ e->vector = (char **) xrealloc (e->vector,
+ (e->allocated + 1) * sizeof (char *));
+ }
+
+ bcopy (environ, e->vector, (i + 1) * sizeof (char *));
+
+ while (--i >= 0)
+ {
+ register int len = strlen (e->vector[i]);
+ register char *new = (char *) xmalloc (len + 1);
+ bcopy (e->vector[i], new, len);
+ e->vector[i] = new;
+ }
+}
+
+/* Return the vector of environment E.
+ This is used to get something to pass to execve. */
+
+char **
+environ_vector (e)
+ struct environ *e;
+{
+ return e->vector;
+}
+
+/* Return the value in environment E of variable VAR. */
+
+char *
+get_in_environ (e, var)
+ struct environ *e;
+ char *var;
+{
+ register int len = strlen (var);
+ register char **vector = e->vector;
+ register char *s;
+
+ for (; s = *vector; vector++)
+ if (!strncmp (s, var, len)
+ && s[len] == '=')
+ return &s[len + 1];
+
+ return 0;
+}
+
+/* Store the value in E of VAR as VALUE. */
+
+void
+set_in_environ (e, var, value)
+ struct environ *e;
+ char *var;
+ char *value;
+{
+ register int i;
+ register int len = strlen (var);
+ register char **vector = e->vector;
+ register char *s;
+
+ for (i = 0; s = vector[i]; i++)
+ if (!strncmp (s, var, len)
+ && s[len] == '=')
+ break;
+
+ if (s == 0)
+ {
+ if (i == e->allocated)
+ {
+ e->allocated += 10;
+ vector = (char **) xrealloc (vector,
+ (e->allocated + 1) * sizeof (char *));
+ e->vector = vector;
+ }
+ vector[i + 1] = 0;
+ }
+ else
+ free (s);
+
+ s = (char *) xmalloc (len + strlen (value) + 2);
+ strcpy (s, var);
+ strcat (s, "=");
+ strcat (s, value);
+ vector[i] = s;
+ return;
+}
+
+/* Remove the setting for variable VAR from environment E. */
+
+void
+unset_in_environ (e, var)
+ struct environ *e;
+ char *var;
+{
+ register int len = strlen (var);
+ register char **vector = e->vector;
+ register char *s;
+
+ for (; s = *vector; vector++)
+ if (!strncmp (s, var, len)
+ && s[len] == '=')
+ {
+ free (s);
+ bcopy (vector + 1, vector,
+ (e->allocated - (vector - e->vector)) * sizeof (char *));
+ e->vector[e->allocated - 1] = 0;
+ return;
+ }
+}