ref: b4b4b6cd631e4627f8e581d20fc70d5d13f4de18
dir: /sys/src/ape/cmd/patch/addext.c/
/* 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 <[email protected]> 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; } }