src/colrm/colrm.c

   1 /*
   2  * Copyright (c) 1980 Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 /*
  31  * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
  32  *      added Native Language Support
  33  * 1999-09-19 Bruno Haible <haible@clisp.cons.org>
  34  *      modified to work correctly in multi-byte locales
  35  * 2002-07-12 Charles Wilson <cwilson@ece.gatech.edu>
  36  *    modified to work on cygwin; integrated into cygutils package
  37  */
  38
  39 #if HAVE_CONFIG_H
  40 #include "config.h"
  41 #endif
  42 #include "common.h"
  43
  44 /* included by common.h *//*
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <locale.h>
  48 */
  49
  50 #ifndef LOCALEDIR
  51 #define LOCALEDIR "/usr/share/locale"
  52 #endif
  53
  54 #ifdef HAVE_LOCALE_H
  55 # include <locale.h>
  56 #endif
  57 #if !HAVE_SETLOCALE
  58 # undef setlocale(a, b)
  59 # define setlocale(a, b) /* empty */
  60 #endif
  61
  62 #include "widechar.h"
  63
  64 /*
  65 COLRM removes unwanted columns from a file
  66         Jeff Schriebman  UC Berkeley 11-74
  67 */
  68
  69 int
  70 main(int argc, char **argv)
  71 {
  72         register int ct, first, last;
  73         register wint_t c;
  74         int i, w;
  75         int padding;
  76
  77         setlocale(LC_ALL, "");
  78
  79         first = 0;
  80         last = 0;
  81         if (argc > 1)
  82                 first = atoi(*++argv);
  83         if (argc > 2)
  84                 last = atoi(*++argv);
  85
  86 start:
  87         ct = 0;
  88 loop1:
  89         c = getwc(stdin);
  90         if (feof(stdin))
  91                 goto fin;
  92         if (c == '\t')
  93                 w = ((ct + 8) & ~7) - ct;
  94         else if (c == '\b')
  95                 w = (ct ? ct - 1 : 0) - ct;
  96         else {
  97                 w = wcwidth(c);
  98                 if (w < 0)
  99                         w = 0;
 100         }
 101         ct += w;
 102         if (c == '\n') {
 103                 putwc(c, stdout);
 104                 goto start;
 105         }
 106         if (!first || ct < first) {
 107                 putwc(c, stdout);
 108                 goto loop1;
 109         }
 110         for (i = ct-w+1; i < first; i++)
 111                 putwc(' ', stdout);
 112
 113 /* Loop getting rid of characters */
 114         while (!last || ct < last) {
 115                 c = getwc(stdin);
 116                 if (feof(stdin))
 117                         goto fin;
 118                 if (c == '\n') {
 119                         putwc(c, stdout);
 120                         goto start;
 121                 }
 122                 if (c == '\t')
 123                         ct = (ct + 8) & ~7;
 124                 else if (c == '\b')
 125                         ct = ct ? ct - 1 : 0;
 126                 else {
 127                         w = wcwidth(c);
 128                         if (w < 0)
 129                                 w = 0;
 130                         ct += w;
 131                 }
 132         }
 133
 134         padding = 0;
 135
 136 /* Output last of the line */
 137         for (;;) {
 138                 c = getwc(stdin);
 139                 if (feof(stdin))
 140                         break;
 141                 if (c == '\n') {
 142                         putwc(c, stdout);
 143                         goto start;
 144                 }
 145                 if (padding == 0 && last < ct) {
 146                         for (i = last; i <ct; i++)
 147                                 putwc(' ', stdout);
 148                         padding = 1;
 149                 }
 150                 putwc(c, stdout);
 151         }
 152 fin:
 153         fflush(stdout);
 154         if (ferror(stdout) || fclose(stdout))
 155                 return 1;
 156         return 0;
 157 }