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authorJim Meyering <jim@meyering.net>1997-05-27 10:30:45 +0000
committerJim Meyering <jim@meyering.net>1997-05-27 10:30:45 +0000
commitc213bae30873d9284fe893ca5a34af01d7844a69 (patch)
treee0c42b316985fd27511f4e76238a34d36d559e52 /lib
parentca55ba371593919fab355caccc492f54e69a560c (diff)
downloadcoreutils-c213bae30873d9284fe893ca5a34af01d7844a69.tar.xz
Update from patch-2.2.93.
Diffstat (limited to 'lib')
-rw-r--r--lib/addext.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/lib/addext.c b/lib/addext.c
new file mode 100644
index 000000000..56d0e4f4a
--- /dev/null
+++ b/lib/addext.c
@@ -0,0 +1,106 @@
+/* addext.c -- add an extension to a file name
+ Copyright (C) 1990, 1997 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING.
+ If not, write to the Free Software Foundation,
+ 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+/* Written by David MacKenzie <djm@gnu.ai.mit.edu> and Paul Eggert */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#ifndef HAVE_DOS_FILE_NAMES
+#define HAVE_DOS_FILE_NAMES 0
+#endif
+#ifndef HAVE_LONG_FILE_NAMES
+#define HAVE_LONG_FILE_NAMES 0
+#endif
+
+#include <backupfile.h>
+
+#if HAVE_LIMITS_H
+# include <limits.h>
+#endif
+#ifndef _POSIX_NAME_MAX
+#define _POSIX_NAME_MAX 14
+#endif
+
+#include <sys/types.h>
+#if HAVE_STRING_H
+# include <string.h>
+#else
+# include <strings.h>
+#endif
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+/* Append to FILENAME the extension EXT, unless the result would be too long,
+ in which case just append the character E. */
+
+void
+addext (filename, ext, e)
+ char *filename;
+ char const *ext;
+ int e;
+{
+ char *s = base_name (filename);
+ size_t slen = strlen (s), extlen = strlen (ext);
+ long slen_max = -1;
+
+#if HAVE_PATHCONF && defined _PC_NAME_MAX
+ if (slen + extlen <= _POSIX_NAME_MAX && ! HAVE_DOS_FILE_NAMES)
+ /* The file name is so short there's no need to call pathconf. */
+ slen_max = _POSIX_NAME_MAX;
+ else if (s == filename)
+ slen_max = pathconf (".", _PC_NAME_MAX);
+ else
+ {
+ char c = *s;
+ *s = 0;
+ slen_max = pathconf (filename, _PC_NAME_MAX);
+ *s = c;
+ }
+#endif
+ if (slen_max < 0)
+ slen_max = HAVE_LONG_FILE_NAMES ? 255 : 14;
+
+ if (HAVE_DOS_FILE_NAMES && slen_max <= 12)
+ {
+ /* Live within DOS's 8.3 limit. */
+ char *dot = strchr (s, '.');
+ if (dot)
+ {
+ slen -= dot + 1 - s;
+ s = dot + 1;
+ slen_max = 3;
+ }
+ else
+ slen_max = 8;
+ extlen = 9; /* Don't use EXT. */
+ }
+
+ if (slen + extlen <= slen_max)
+ strcpy (s + slen, ext);
+ else
+ {
+ if (slen_max <= slen)
+ slen = slen_max - 1;
+ s[slen] = e;
+ s[slen + 1] = 0;
+ }
+}