contrib/cvs/lib/fncase.c

   1 /* fncase.c -- CVS support for case insensitive file systems.
   2    Jim Blandy <jimb@cyclic.com>
   3
   4    This file is part of GNU CVS.
   5
   6    GNU CVS is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 2, or (at your option) any
   9    later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.  */
  15
  16 #ifdef HAVE_CONFIG_H
  17 #include "config.h"
  18 #endif
  19
  20 #include "system.h"
  21
  22 /* The equivalence class mapping for filenames.
  23    Windows NT filenames are case-insensitive, but case-preserving.
  24    Both / and \ are path element separators.
  25    Thus, this table maps both upper and lower case to lower case, and
  26    both / and \ to /.  */
  27
  28 #if 0
  29 main ()
  30 {
  31   int c;
  32
  33   for (c = 0; c < 256; c++)
  34     {
  35       int t;
  36
  37       if (c == '\\')
  38         t = '/';
  39       else
  40         t = tolower (c);
  41
  42       if ((c & 0x7) == 0x0)
  43          printf ("    ");
  44       printf ("0x%02x,", t);
  45       if ((c & 0x7) == 0x7)
  46          putchar ('\n');
  47       else if ((c & 0x7) == 0x3)
  48          putchar (' ');
  49     }
  50 }
  51 #endif
  52
  53 /* Under Windows NT, filenames are case-insensitive but case-preserving,
  54    and both \ and / are path element separators.  */
  55 unsigned char
  56 WNT_filename_classes[] =
  57 {
  58     0x00,0x01,0x02,0x03, 0x04,0x05,0x06,0x07,
  59     0x08,0x09,0x0a,0x0b, 0x0c,0x0d,0x0e,0x0f,
  60     0x10,0x11,0x12,0x13, 0x14,0x15,0x16,0x17,
  61     0x18,0x19,0x1a,0x1b, 0x1c,0x1d,0x1e,0x1f,
  62     0x20,0x21,0x22,0x23, 0x24,0x25,0x26,0x27,
  63     0x28,0x29,0x2a,0x2b, 0x2c,0x2d,0x2e,0x2f,
  64     0x30,0x31,0x32,0x33, 0x34,0x35,0x36,0x37,
  65     0x38,0x39,0x3a,0x3b, 0x3c,0x3d,0x3e,0x3f,
  66     0x40,0x61,0x62,0x63, 0x64,0x65,0x66,0x67,
  67     0x68,0x69,0x6a,0x6b, 0x6c,0x6d,0x6e,0x6f,
  68     0x70,0x71,0x72,0x73, 0x74,0x75,0x76,0x77,
  69     0x78,0x79,0x7a,0x5b, 0x2f,0x5d,0x5e,0x5f,
  70     0x60,0x61,0x62,0x63, 0x64,0x65,0x66,0x67,
  71     0x68,0x69,0x6a,0x6b, 0x6c,0x6d,0x6e,0x6f,
  72     0x70,0x71,0x72,0x73, 0x74,0x75,0x76,0x77,
  73     0x78,0x79,0x7a,0x7b, 0x7c,0x7d,0x7e,0x7f,
  74     0x80,0x81,0x82,0x83, 0x84,0x85,0x86,0x87,
  75     0x88,0x89,0x8a,0x8b, 0x8c,0x8d,0x8e,0x8f,
  76     0x90,0x91,0x92,0x93, 0x94,0x95,0x96,0x97,
  77     0x98,0x99,0x9a,0x9b, 0x9c,0x9d,0x9e,0x9f,
  78     0xa0,0xa1,0xa2,0xa3, 0xa4,0xa5,0xa6,0xa7,
  79     0xa8,0xa9,0xaa,0xab, 0xac,0xad,0xae,0xaf,
  80     0xb0,0xb1,0xb2,0xb3, 0xb4,0xb5,0xb6,0xb7,
  81     0xb8,0xb9,0xba,0xbb, 0xbc,0xbd,0xbe,0xbf,
  82     0xc0,0xc1,0xc2,0xc3, 0xc4,0xc5,0xc6,0xc7,
  83     0xc8,0xc9,0xca,0xcb, 0xcc,0xcd,0xce,0xcf,
  84     0xd0,0xd1,0xd2,0xd3, 0xd4,0xd5,0xd6,0xd7,
  85     0xd8,0xd9,0xda,0xdb, 0xdc,0xdd,0xde,0xdf,
  86     0xe0,0xe1,0xe2,0xe3, 0xe4,0xe5,0xe6,0xe7,
  87     0xe8,0xe9,0xea,0xeb, 0xec,0xed,0xee,0xef,
  88     0xf0,0xf1,0xf2,0xf3, 0xf4,0xf5,0xf6,0xf7,
  89     0xf8,0xf9,0xfa,0xfb, 0xfc,0xfd,0xfe,0xff,
  90 };
  91
  92 /* Same as WNT_filename_classes, but do not fold `\' into `/'.  */
  93 unsigned char
  94 OSX_filename_classes[] =
  95 {
  96     0x00,0x01,0x02,0x03, 0x04,0x05,0x06,0x07,
  97     0x08,0x09,0x0a,0x0b, 0x0c,0x0d,0x0e,0x0f,
  98     0x10,0x11,0x12,0x13, 0x14,0x15,0x16,0x17,
  99     0x18,0x19,0x1a,0x1b, 0x1c,0x1d,0x1e,0x1f,
 100     0x20,0x21,0x22,0x23, 0x24,0x25,0x26,0x27,
 101     0x28,0x29,0x2a,0x2b, 0x2c,0x2d,0x2e,0x2f,
 102     0x30,0x31,0x32,0x33, 0x34,0x35,0x36,0x37,
 103     0x38,0x39,0x3a,0x3b, 0x3c,0x3d,0x3e,0x3f,
 104     0x40,0x61,0x62,0x63, 0x64,0x65,0x66,0x67,
 105     0x68,0x69,0x6a,0x6b, 0x6c,0x6d,0x6e,0x6f,
 106     0x70,0x71,0x72,0x73, 0x74,0x75,0x76,0x77,
 107     0x78,0x79,0x7a,0x5b, 0x5c,0x5d,0x5e,0x5f,
 108     0x60,0x61,0x62,0x63, 0x64,0x65,0x66,0x67,
 109     0x68,0x69,0x6a,0x6b, 0x6c,0x6d,0x6e,0x6f,
 110     0x70,0x71,0x72,0x73, 0x74,0x75,0x76,0x77,
 111     0x78,0x79,0x7a,0x7b, 0x7c,0x7d,0x7e,0x7f,
 112     0x80,0x81,0x82,0x83, 0x84,0x85,0x86,0x87,
 113     0x88,0x89,0x8a,0x8b, 0x8c,0x8d,0x8e,0x8f,
 114     0x90,0x91,0x92,0x93, 0x94,0x95,0x96,0x97,
 115     0x98,0x99,0x9a,0x9b, 0x9c,0x9d,0x9e,0x9f,
 116     0xa0,0xa1,0xa2,0xa3, 0xa4,0xa5,0xa6,0xa7,
 117     0xa8,0xa9,0xaa,0xab, 0xac,0xad,0xae,0xaf,
 118     0xb0,0xb1,0xb2,0xb3, 0xb4,0xb5,0xb6,0xb7,
 119     0xb8,0xb9,0xba,0xbb, 0xbc,0xbd,0xbe,0xbf,
 120     0xc0,0xc1,0xc2,0xc3, 0xc4,0xc5,0xc6,0xc7,
 121     0xc8,0xc9,0xca,0xcb, 0xcc,0xcd,0xce,0xcf,
 122     0xd0,0xd1,0xd2,0xd3, 0xd4,0xd5,0xd6,0xd7,
 123     0xd8,0xd9,0xda,0xdb, 0xdc,0xdd,0xde,0xdf,
 124     0xe0,0xe1,0xe2,0xe3, 0xe4,0xe5,0xe6,0xe7,
 125     0xe8,0xe9,0xea,0xeb, 0xec,0xed,0xee,0xef,
 126     0xf0,0xf1,0xf2,0xf3, 0xf4,0xf5,0xf6,0xf7,
 127     0xf8,0xf9,0xfa,0xfb, 0xfc,0xfd,0xfe,0xff,
 128 };
 129
 130 /* Like strcmp, but with the appropriate tweaks for file names.
 131    Under Windows NT, filenames are case-insensitive but case-preserving,
 132    and both \ and / are path element separators.  Under Mac OS X, filenames
 133    are case-insensitive but case-preserving.  */
 134 int
 135 fncmp (const char *n1, const char *n2)
 136 {
 137     while (*n1 && *n2
 138            && (FOLD_FN_CHAR(*n1)
 139                == FOLD_FN_CHAR(*n2)))
 140         n1++, n2++;
 141     return (FOLD_FN_CHAR(*n1) - FOLD_FN_CHAR(*n2));
 142 }
 143
 144 /* Fold characters in FILENAME to their canonical forms.
 145    If FOLD_FN_CHAR is not #defined, the system provides a default
 146    definition for this.  */
 147 void
 148 fnfold (char *filename)
 149 {
 150     while (*filename)
 151     {
 152         *filename = FOLD_FN_CHAR (*filename);
 153         filename++;
 154     }
 155 }