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1 /* addext.c -- add an extension to a file name |
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2 Copyright (C) 1990, 1997, 1998 Free Software Foundation, Inc. |
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3 |
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4 This program is free software; you can redistribute it and/or modify |
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5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 2, or (at your option) |
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7 any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License |
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15 along with this program; see the file COPYING. |
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16 If not, write to the Free Software Foundation, |
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17 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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18 |
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19 /* Written by David MacKenzie <djm@gnu.ai.mit.edu> and Paul Eggert */ |
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20 |
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21 #if HAVE_CONFIG_H |
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22 # include <config.h> |
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23 #endif |
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24 |
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25 #ifndef HAVE_DOS_FILE_NAMES |
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26 # define HAVE_DOS_FILE_NAMES 0 |
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27 #endif |
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28 #ifndef HAVE_LONG_FILE_NAMES |
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29 # define HAVE_LONG_FILE_NAMES 0 |
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30 #endif |
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31 |
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32 #include <backupfile.h> |
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33 |
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34 #if HAVE_LIMITS_H |
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35 # include <limits.h> |
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36 #endif |
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37 #ifndef _POSIX_NAME_MAX |
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38 # define _POSIX_NAME_MAX 14 |
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39 #endif |
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40 |
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41 #include <sys/types.h> |
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42 #if HAVE_STRING_H |
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43 # include <string.h> |
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44 #else |
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45 # include <strings.h> |
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46 #endif |
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47 |
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48 #if HAVE_UNISTD_H |
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49 # include <unistd.h> |
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50 #endif |
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51 |
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52 /* Append to FILENAME the extension EXT, unless the result would be too long, |
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53 in which case just append the character E. */ |
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54 |
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55 void |
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56 addext (char *filename, char const *ext, int e) |
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57 { |
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58 char *s = base_name (filename); |
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59 size_t slen = strlen (s), extlen = strlen (ext); |
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60 long slen_max = -1; |
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61 |
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62 #if HAVE_PATHCONF && defined _PC_NAME_MAX |
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63 if (slen + extlen <= _POSIX_NAME_MAX && ! HAVE_DOS_FILE_NAMES) |
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64 /* The file name is so short there's no need to call pathconf. */ |
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65 slen_max = _POSIX_NAME_MAX; |
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66 else if (s == filename) |
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67 slen_max = pathconf (".", _PC_NAME_MAX); |
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68 else |
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69 { |
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70 char c = *s; |
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71 *s = 0; |
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72 slen_max = pathconf (filename, _PC_NAME_MAX); |
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73 *s = c; |
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74 } |
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75 #endif |
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76 if (slen_max < 0) |
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77 slen_max = HAVE_LONG_FILE_NAMES ? 255 : 14; |
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78 |
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79 if (HAVE_DOS_FILE_NAMES && slen_max <= 12) |
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80 { |
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81 /* Live within DOS's 8.3 limit. */ |
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82 char *dot = strchr (s, '.'); |
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83 if (dot) |
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84 { |
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85 slen -= dot + 1 - s; |
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86 s = dot + 1; |
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87 slen_max = 3; |
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88 } |
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89 else |
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90 slen_max = 8; |
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91 extlen = 9; /* Don't use EXT. */ |
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92 } |
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93 |
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94 if (slen + extlen <= slen_max) |
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95 strcpy (s + slen, ext); |
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96 else |
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97 { |
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98 if (slen_max <= slen) |
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99 slen = slen_max - 1; |
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100 s[slen] = e; |
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101 s[slen + 1] = 0; |
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102 } |
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103 } |
