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/* addext.c -- add an extension to a file name
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Copyright (C) 1990, 1997 Free Software Foundation, Inc.
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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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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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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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along with this program; see the file COPYING.
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If not, write to the Free Software Foundation,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by David MacKenzie <djm@gnu.ai.mit.edu> and Paul Eggert */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifndef HAVE_DOS_FILE_NAMES
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#define HAVE_DOS_FILE_NAMES 0
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#endif
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#ifndef HAVE_LONG_FILE_NAMES
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#define HAVE_LONG_FILE_NAMES 0
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#endif
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#include <backupfile.h>
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#if HAVE_LIMITS_H
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# include <limits.h>
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#endif
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#ifndef _POSIX_NAME_MAX
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#define _POSIX_NAME_MAX 14
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#endif
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#include <sys/types.h>
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#if HAVE_STRING_H
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# include <string.h>
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#else
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# include <strings.h>
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#endif
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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/* Append to FILENAME the extension EXT, unless the result would be too long,
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in which case just append the character E. */
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void
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addext (filename, ext, e)
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char *filename;
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char const *ext;
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int e;
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{
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char *s = base_name (filename);
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size_t slen = strlen (s), extlen = strlen (ext);
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long slen_max = -1;
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#if HAVE_PATHCONF && defined _PC_NAME_MAX
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if (slen + extlen <= _POSIX_NAME_MAX && ! HAVE_DOS_FILE_NAMES)
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/* The file name is so short there's no need to call pathconf. */
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slen_max = _POSIX_NAME_MAX;
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else if (s == filename)
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slen_max = pathconf (".", _PC_NAME_MAX);
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else
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{
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char c = *s;
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*s = 0;
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slen_max = pathconf (filename, _PC_NAME_MAX);
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*s = c;
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}
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#endif
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if (slen_max < 0)
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slen_max = HAVE_LONG_FILE_NAMES ? 255 : 14;
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if (HAVE_DOS_FILE_NAMES && slen_max <= 12)
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{
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/* Live within DOS's 8.3 limit. */
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char *dot = strchr (s, '.');
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if (dot)
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{
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slen -= dot + 1 - s;
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s = dot + 1;
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slen_max = 3;
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}
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else
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slen_max = 8;
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extlen = 9; /* Don't use EXT. */
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}
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if (slen + extlen <= slen_max)
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strcpy (s + slen, ext);
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else
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{
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if (slen_max <= slen)
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slen = slen_max - 1;
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s[slen] = e;
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s[slen + 1] = 0;
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}
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}
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