ls/util.c

   1 /*
   2  * Copyright (c) 1989, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Michael Fischbein.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #if 0
  38 #ifndef lint
  39 static char sccsid[] = "@(#)util.c      8.3 (Berkeley) 4/2/94";
  40 #endif /* not lint */
  41 #endif
  42 #include <sys/types.h>
  43 __RCSID("$FreeBSD: src/bin/ls/util.c,v 1.30 2002/06/30 05:13:54 obrien Exp $");
  44
  45 #include <sys/types.h>
  46 #include <sys/stat.h>
  47
  48 #include <ctype.h>
  49 #include <err.h>
  50 #include <fts.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54
  55 #include "ls.h"
  56 #include "extern.h"
  57
  58 int
  59 prn_printable(const char *s)
  60 {
  61         char c;
  62         int n;
  63
  64         for (n = 0; (c = *s) != '\0'; ++s, ++n)
  65                 if (isprint((unsigned char)c))
  66                         putchar(c);
  67                 else
  68                         putchar('?');
  69         return n;
  70 }
  71
  72 /*
  73  * The fts system makes it difficult to replace fts_name with a different-
  74  * sized string, so we just calculate the real length here and do the
  75  * conversion in prn_octal()
  76  *
  77  * XXX when using f_octal_escape (-b) rather than f_octal (-B), the
  78  * length computed by len_octal may be too big. I just can't be buggered
  79  * to fix this as an efficient fix would involve a lookup table. Same goes
  80  * for the rather inelegant code in prn_octal.
  81  *
  82  *                                              DES 1998/04/23
  83  */
  84
  85 size_t
  86 len_octal(const char *s, int len)
  87 {
  88         size_t r = 0;
  89
  90         while (len--)
  91                 if (isprint((unsigned const char)*s++)) r++; else r += 4;
  92         return r;
  93 }
  94
  95 int
  96 prn_octal(const char *s)
  97 {
  98         unsigned char ch;
  99         int len = 0;
 100
 101         while ((ch = (unsigned char)*s++)) {
 102                 if (isprint(ch) && (ch != '\"') && (ch != '\\'))
 103                         putchar(ch), len++;
 104                 else if (f_octal_escape) {
 105                         putchar('\\');
 106                         switch (ch) {
 107                         case '\\':
 108                                 putchar('\\');
 109                                 break;
 110                         case '\"':
 111                                 putchar('"');
 112                                 break;
 113                         case '\a':
 114                                 putchar('a');
 115                                 break;
 116                         case '\b':
 117                                 putchar('b');
 118                                 break;
 119                         case '\f':
 120                                 putchar('f');
 121                                 break;
 122                         case '\n':
 123                                 putchar('n');
 124                                 break;
 125                         case '\r':
 126                                 putchar('r');
 127                                 break;
 128                         case '\t':
 129                                 putchar('t');
 130                                 break;
 131                         case '\v':
 132                                 putchar('v');
 133                                 break;
 134                         default:
 135                                 putchar('0' + (ch >> 6));
 136                                 putchar('0' + ((ch >> 3) & 7));
 137                                 putchar('0' + (ch & 7));
 138                                 len += 2;
 139                                 break;
 140                         }
 141                         len += 2;
 142                 }
 143                 else {
 144                         putchar('\\');
 145                         putchar('0' + (ch >> 6));
 146                         putchar('0' + ((ch >> 3) & 7));
 147                         putchar('0' + (ch & 7));
 148                         len += 4;
 149                 }
 150         }
 151         return len;
 152 }
 153
 154 void
 155 usage(void)
 156 {
 157         (void)fprintf(stderr,
 158 #ifdef COLORLS
 159         "usage: ls [-ABCFGHLPRSTWZabcdefghiklmnopqrstuwx1]"
 160 #else
 161         "usage: ls [-ABCFHLPRSTWZabcdefghiklmnopqrstuwx1]"
 162 #endif
 163                       " [file ...]\n");
 164         exit(1);
 165 }