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