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1.12 ! schwarze 1: /* $OpenBSD: colrm.c,v 1.11 2015/10/09 01:37:06 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: colrm.c,v 1.4 1995/09/02 05:51:37 jtc Exp $ */
3:
4: /*-
5: * Copyright (c) 1991, 1993
6: * The Regents of the University of California. All rights reserved.
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.
1.7 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #include <sys/types.h>
34:
35: #include <err.h>
36: #include <errno.h>
37: #include <limits.h>
1.12 ! schwarze 38: #include <locale.h>
1.1 deraadt 39: #include <stdio.h>
40: #include <stdlib.h>
41: #include <string.h>
42: #include <unistd.h>
1.12 ! schwarze 43: #include <wchar.h>
1.1 deraadt 44:
45: #define TAB 8
46:
1.6 millert 47: void usage(void);
1.1 deraadt 48:
49: int
1.8 deraadt 50: main(int argc, char *argv[])
1.1 deraadt 51: {
1.12 ! schwarze 52: char *line, *p;
! 53: ssize_t linesz;
! 54: wchar_t wc;
! 55: u_long column, newcol, start, stop;
! 56: int ch, len, width;
! 57:
! 58: setlocale(LC_ALL, "");
1.10 deraadt 59:
1.11 deraadt 60: if (pledge("stdio", NULL) == -1)
61: err(1, "pledge");
1.1 deraadt 62:
1.3 millert 63: while ((ch = getopt(argc, argv, "")) != -1)
1.1 deraadt 64: switch(ch) {
65: case '?':
66: default:
67: usage();
68: }
69: argc -= optind;
70: argv += optind;
71:
72: start = stop = 0;
73: switch(argc) {
74: case 2:
75: stop = strtol(argv[1], &p, 10);
76: if (stop <= 0 || *p)
77: errx(1, "illegal column -- %s", argv[1]);
78: /* FALLTHROUGH */
79: case 1:
80: start = strtol(argv[0], &p, 10);
81: if (start <= 0 || *p)
82: errx(1, "illegal column -- %s", argv[0]);
83: break;
84: case 0:
85: break;
86: default:
87: usage();
88: }
89:
90: if (stop && start > stop)
91: err(1, "illegal start and stop columns");
92:
1.12 ! schwarze 93: line = NULL;
! 94: while (getline(&line, &linesz, stdin) != -1) {
! 95: column = 0;
! 96: width = 0;
! 97: for (p = line; *p != '\0'; p += len) {
! 98: len = 1;
! 99: switch (*p) {
! 100: case '\n':
! 101: putchar('\n');
! 102: continue;
! 103: case '\b':
! 104: /*
! 105: * Pass it through if the previous character
! 106: * was in scope, still represented by the
! 107: * current value of "column".
! 108: * Allow an optional second backspace
! 109: * after a double-width character.
! 110: */
! 111: if (start == 0 || column < start ||
! 112: (stop > 0 &&
! 113: column > stop + (width > 1))) {
! 114: putchar('\b');
! 115: if (width > 1 && p[1] == '\b')
! 116: putchar('\b');
! 117: }
! 118: if (width > 1 && p[1] == '\b')
! 119: p++;
! 120: column -= width;
! 121: continue;
! 122: case '\t':
! 123: newcol = (column + TAB) & ~(TAB - 1);
! 124: if (start == 0 || newcol < start) {
! 125: putchar('\t');
! 126: column = newcol;
! 127: } else
! 128: /*
! 129: * Expand tabs that intersect or
! 130: * follow deleted columns.
! 131: */
! 132: while (column < newcol)
! 133: if (++column < start ||
! 134: (stop > 0 &&
! 135: column > stop))
! 136: putchar(' ');
! 137: continue;
! 138: default:
! 139: break;
! 140: }
! 141:
! 142: /*
! 143: * Handle the three cases of invalid bytes,
! 144: * non-printable, and printable characters.
! 145: */
! 146:
! 147: if ((len = mbtowc(&wc, p, MB_CUR_MAX)) == -1) {
! 148: (void)mbtowc(NULL, NULL, MB_CUR_MAX);
! 149: len = 1;
! 150: width = 1;
! 151: } else if ((width = wcwidth(wc)) == -1)
! 152: width = 1;
! 153:
! 154: /*
! 155: * If the character completely fits before or
! 156: * after the cut, keep it; otherwise, skip it.
! 157: */
! 158:
! 159: if ((start == 0 || column + width < start ||
! 160: (stop > 0 && column + (width > 0) > stop)))
! 161: fwrite(p, 1, len, stdout);
! 162:
! 163: /*
! 164: * If the cut cuts the character in half
! 165: * and no backspace follows,
! 166: * print a blank for correct columnation.
! 167: */
! 168:
! 169: else if (width > 1 && p[len] != '\b' &&
! 170: (start == 0 || column + 1 < start ||
! 171: (stop > 0 && column + width > stop)))
! 172: putchar(' ');
! 173:
! 174: column += width;
1.1 deraadt 175: }
176: }
1.12 ! schwarze 177: if (ferror(stdin))
! 178: err(1, "stdin");
! 179: if (ferror(stdout))
! 180: err(1, "stdout");
! 181: return 0;
1.1 deraadt 182: }
183:
184: void
1.8 deraadt 185: usage(void)
1.1 deraadt 186: {
187: (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
188: exit(1);
189: }