1*0b459c2cSDavid du Colombier /* addext.c -- add an extension to a file name
2*0b459c2cSDavid du Colombier Copyright (C) 1990, 1997 Free Software Foundation, Inc.
3*0b459c2cSDavid du Colombier
4*0b459c2cSDavid du Colombier This program is free software; you can redistribute it and/or modify
5*0b459c2cSDavid du Colombier it under the terms of the GNU General Public License as published by
6*0b459c2cSDavid du Colombier the Free Software Foundation; either version 2, or (at your option)
7*0b459c2cSDavid du Colombier any later version.
8*0b459c2cSDavid du Colombier
9*0b459c2cSDavid du Colombier This program is distributed in the hope that it will be useful,
10*0b459c2cSDavid du Colombier but WITHOUT ANY WARRANTY; without even the implied warranty of
11*0b459c2cSDavid du Colombier MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12*0b459c2cSDavid du Colombier GNU General Public License for more details.
13*0b459c2cSDavid du Colombier
14*0b459c2cSDavid du Colombier You should have received a copy of the GNU General Public License
15*0b459c2cSDavid du Colombier along with this program; see the file COPYING.
16*0b459c2cSDavid du Colombier If not, write to the Free Software Foundation,
17*0b459c2cSDavid du Colombier 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18*0b459c2cSDavid du Colombier
19*0b459c2cSDavid du Colombier /* Written by David MacKenzie <djm@gnu.ai.mit.edu> and Paul Eggert */
20*0b459c2cSDavid du Colombier
21*0b459c2cSDavid du Colombier #if HAVE_CONFIG_H
22*0b459c2cSDavid du Colombier # include <config.h>
23*0b459c2cSDavid du Colombier #endif
24*0b459c2cSDavid du Colombier
25*0b459c2cSDavid du Colombier #ifndef HAVE_DOS_FILE_NAMES
26*0b459c2cSDavid du Colombier #define HAVE_DOS_FILE_NAMES 0
27*0b459c2cSDavid du Colombier #endif
28*0b459c2cSDavid du Colombier #ifndef HAVE_LONG_FILE_NAMES
29*0b459c2cSDavid du Colombier #define HAVE_LONG_FILE_NAMES 0
30*0b459c2cSDavid du Colombier #endif
31*0b459c2cSDavid du Colombier
32*0b459c2cSDavid du Colombier #include <backupfile.h>
33*0b459c2cSDavid du Colombier
34*0b459c2cSDavid du Colombier #if HAVE_LIMITS_H
35*0b459c2cSDavid du Colombier # include <limits.h>
36*0b459c2cSDavid du Colombier #endif
37*0b459c2cSDavid du Colombier #ifndef _POSIX_NAME_MAX
38*0b459c2cSDavid du Colombier #define _POSIX_NAME_MAX 14
39*0b459c2cSDavid du Colombier #endif
40*0b459c2cSDavid du Colombier
41*0b459c2cSDavid du Colombier #include <sys/types.h>
42*0b459c2cSDavid du Colombier #if HAVE_STRING_H
43*0b459c2cSDavid du Colombier # include <string.h>
44*0b459c2cSDavid du Colombier #else
45*0b459c2cSDavid du Colombier # include <strings.h>
46*0b459c2cSDavid du Colombier #endif
47*0b459c2cSDavid du Colombier
48*0b459c2cSDavid du Colombier #if HAVE_UNISTD_H
49*0b459c2cSDavid du Colombier # include <unistd.h>
50*0b459c2cSDavid du Colombier #endif
51*0b459c2cSDavid du Colombier
52*0b459c2cSDavid du Colombier /* Append to FILENAME the extension EXT, unless the result would be too long,
53*0b459c2cSDavid du Colombier in which case just append the character E. */
54*0b459c2cSDavid du Colombier
55*0b459c2cSDavid du Colombier void
addext(filename,ext,e)56*0b459c2cSDavid du Colombier addext (filename, ext, e)
57*0b459c2cSDavid du Colombier char *filename;
58*0b459c2cSDavid du Colombier char const *ext;
59*0b459c2cSDavid du Colombier int e;
60*0b459c2cSDavid du Colombier {
61*0b459c2cSDavid du Colombier char *s = base_name (filename);
62*0b459c2cSDavid du Colombier size_t slen = strlen (s), extlen = strlen (ext);
63*0b459c2cSDavid du Colombier long slen_max = -1;
64*0b459c2cSDavid du Colombier
65*0b459c2cSDavid du Colombier #if HAVE_PATHCONF && defined _PC_NAME_MAX
66*0b459c2cSDavid du Colombier if (slen + extlen <= _POSIX_NAME_MAX && ! HAVE_DOS_FILE_NAMES)
67*0b459c2cSDavid du Colombier /* The file name is so short there's no need to call pathconf. */
68*0b459c2cSDavid du Colombier slen_max = _POSIX_NAME_MAX;
69*0b459c2cSDavid du Colombier else if (s == filename)
70*0b459c2cSDavid du Colombier slen_max = pathconf (".", _PC_NAME_MAX);
71*0b459c2cSDavid du Colombier else
72*0b459c2cSDavid du Colombier {
73*0b459c2cSDavid du Colombier char c = *s;
74*0b459c2cSDavid du Colombier *s = 0;
75*0b459c2cSDavid du Colombier slen_max = pathconf (filename, _PC_NAME_MAX);
76*0b459c2cSDavid du Colombier *s = c;
77*0b459c2cSDavid du Colombier }
78*0b459c2cSDavid du Colombier #endif
79*0b459c2cSDavid du Colombier if (slen_max < 0)
80*0b459c2cSDavid du Colombier slen_max = HAVE_LONG_FILE_NAMES ? 255 : 14;
81*0b459c2cSDavid du Colombier
82*0b459c2cSDavid du Colombier if (HAVE_DOS_FILE_NAMES && slen_max <= 12)
83*0b459c2cSDavid du Colombier {
84*0b459c2cSDavid du Colombier /* Live within DOS's 8.3 limit. */
85*0b459c2cSDavid du Colombier char *dot = strchr (s, '.');
86*0b459c2cSDavid du Colombier if (dot)
87*0b459c2cSDavid du Colombier {
88*0b459c2cSDavid du Colombier slen -= dot + 1 - s;
89*0b459c2cSDavid du Colombier s = dot + 1;
90*0b459c2cSDavid du Colombier slen_max = 3;
91*0b459c2cSDavid du Colombier }
92*0b459c2cSDavid du Colombier else
93*0b459c2cSDavid du Colombier slen_max = 8;
94*0b459c2cSDavid du Colombier extlen = 9; /* Don't use EXT. */
95*0b459c2cSDavid du Colombier }
96*0b459c2cSDavid du Colombier
97*0b459c2cSDavid du Colombier if (slen + extlen <= slen_max)
98*0b459c2cSDavid du Colombier strcpy (s + slen, ext);
99*0b459c2cSDavid du Colombier else
100*0b459c2cSDavid du Colombier {
101*0b459c2cSDavid du Colombier if (slen_max <= slen)
102*0b459c2cSDavid du Colombier slen = slen_max - 1;
103*0b459c2cSDavid du Colombier s[slen] = e;
104*0b459c2cSDavid du Colombier s[slen + 1] = 0;
105*0b459c2cSDavid du Colombier }
106*0b459c2cSDavid du Colombier }
107