text-utils/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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
  36  *      added Native Language Support
  37  * 1999-09-19 Bruno Haible <haible@clisp.cons.org>
  38  *      modified to work correctly in multi-byte locales
  39  */
  40
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <locale.h>
  44
  45 #include "widechar.h"
  46
  47 /*
  48 COLRM removes unwanted columns from a file
  49         Jeff Schriebman  UC Berkeley 11-74
  50 */
  51
  52 int
  53 main(int argc, char **argv)
  54 {
  55         register int ct, first, last;
  56         register wint_t c;
  57         int i, w;
  58         int padding;
  59
  60         setlocale(LC_ALL, "");
  61
  62         first = 0;
  63         last = 0;
  64         if (argc > 1)
  65                 first = atoi(*++argv);
  66         if (argc > 2)
  67                 last = atoi(*++argv);
  68
  69 start:
  70         ct = 0;
  71 loop1:
  72         c = getwc(stdin);
  73         if (feof(stdin))
  74                 goto fin;
  75         if (c == '\t')
  76                 w = ((ct + 8) & ~7) - ct;
  77         else if (c == '\b')
  78                 w = (ct ? ct - 1 : 0) - ct;
  79         else {
  80                 w = wcwidth(c);
  81                 if (w < 0)
  82                         w = 0;
  83         }
  84         ct += w;
  85         if (c == '\n') {
  86                 putwc(c, stdout);
  87                 goto start;
  88         }
  89         if (!first || ct < first) {
  90                 putwc(c, stdout);
  91                 goto loop1;
  92         }
  93         for (i = ct-w+1; i < first; i++)
  94                 putwc(' ', stdout);
  95
  96 /* Loop getting rid of characters */
  97         while (!last || ct < last) {
  98                 c = getwc(stdin);
  99                 if (feof(stdin))
 100                         goto fin;
 101                 if (c == '\n') {
 102                         putwc(c, stdout);
 103                         goto start;
 104                 }
 105                 if (c == '\t')
 106                         ct = (ct + 8) & ~7;
 107                 else if (c == '\b')
 108                         ct = ct ? ct - 1 : 0;
 109                 else {
 110                         w = wcwidth(c);
 111                         if (w < 0)
 112                                 w = 0;
 113                         ct += w;
 114                 }
 115         }
 116
 117         padding = 0;
 118
 119 /* Output last of the line */
 120         for (;;) {
 121                 c = getwc(stdin);
 122                 if (feof(stdin))
 123                         break;
 124                 if (c == '\n') {
 125                         putwc(c, stdout);
 126                         goto start;
 127                 }
 128                 if (padding == 0 && last < ct) {
 129                         for (i = last; i <ct; i++)
 130                                 putwc(' ', stdout);
 131                         padding = 1;
 132                 }
 133                 putwc(c, stdout);
 134         }
 135 fin:
 136         fflush(stdout);
 137         if (ferror(stdout) || fclose(stdout))
 138                 return 1;
 139         return 0;
 140 }