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1.13 ! schwarze 1: /* $OpenBSD: colrm.c,v 1.12 2016/01/18 20:31:36 schwarze 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:
1.13 ! schwarze 58: setlocale(LC_CTYPE, "");
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: }