| 1 | /* Relative (relocatable) prefix support.
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| 2 | Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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| 3 | 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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| 4 |
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| 5 | This file is part of libiberty.
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| 6 |
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| 7 | GCC is free software; you can redistribute it and/or modify it under
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| 8 | the terms of the GNU General Public License as published by the Free
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| 9 | Software Foundation; either version 2, or (at your option) any later
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| 10 | version.
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| 11 |
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| 12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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| 13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or
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| 14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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| 15 | for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with GCC; see the file COPYING. If not, write to the Free
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| 19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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| 20 | 02111-1307, USA. */
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| 21 |
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| 22 | /*
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| 23 |
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| 24 | @deftypefn Extension {const char*} make_relative_prefix (const char *@var{progname}, const char *@var{bin_prefix}, const char *@var{prefix})
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| 25 |
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| 26 | Given three paths @var{progname}, @var{bin_prefix}, @var{prefix},
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| 27 | return the path that is in the same position relative to
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| 28 | @var{progname}'s directory as @var{prefix} is relative to
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| 29 | @var{bin_prefix}. That is, a string starting with the directory
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| 30 | portion of @var{progname}, followed by a relative pathname of the
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| 31 | difference between @var{bin_prefix} and @var{prefix}.
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| 32 |
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| 33 | If @var{progname} does not contain any directory separators,
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| 34 | @code{make_relative_prefix} will search @env{PATH} to find a program
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| 35 | named @var{progname}. Also, if @var{progname} is a symbolic link,
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| 36 | the symbolic link will be resolved.
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| 37 |
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| 38 | For example, if @var{bin_prefix} is @code{/alpha/beta/gamma/gcc/delta},
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| 39 | @var{prefix} is @code{/alpha/beta/gamma/omega/}, and @var{progname} is
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| 40 | @code{/red/green/blue/gcc}, then this function will return
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| 41 | @code{/red/green/blue/../../omega/}.
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| 42 |
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| 43 | The return value is normally allocated via @code{malloc}. If no
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| 44 | relative prefix can be found, return @code{NULL}.
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| 45 |
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| 46 | @end deftypefn
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| 47 |
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| 48 | */
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| 49 |
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| 50 | #ifdef HAVE_CONFIG_H
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| 51 | #include "config.h"
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| 52 | #endif
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| 53 |
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| 54 | #ifdef HAVE_STDLIB_H
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| 55 | #include <stdlib.h>
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| 56 | #endif
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| 57 | #ifdef HAVE_UNISTD_H
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| 58 | #include <unistd.h>
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| 59 | #endif
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| 60 |
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| 61 | #include <string.h>
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| 62 |
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