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1.7 ! millert 1: /* $OpenBSD: fold.c,v 1.6 2002/06/17 07:06:12 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: fold.c,v 1.6 1995/09/01 01:42:44 jtc Exp $ */
3:
4: /*-
5: * Copyright (c) 1990, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Kevin Ruddy.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.7 ! millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: static char copyright[] =
38: "@(#) Copyright (c) 1990, 1993\n\
39: The Regents of the University of California. All rights reserved.\n";
40: #endif /* not lint */
41:
42: #ifndef lint
43: #if 0
44: static char sccsid[] = "@(#)fold.c 8.1 (Berkeley) 6/6/93";
45: #endif
1.7 ! millert 46: static char rcsid[] = "$OpenBSD: fold.c,v 1.6 2002/06/17 07:06:12 deraadt Exp $";
1.1 deraadt 47: #endif /* not lint */
48:
49: #include <stdio.h>
50: #include <stdlib.h>
51: #include <string.h>
52: #include <unistd.h>
53: #include <err.h>
54:
55: #define DEFLINEWIDTH 80
56:
57: static void fold ();
58: static int new_column_position ();
59: int count_bytes = 0;
60: int split_words = 0;
61:
62: int
63: main(argc, argv)
64: int argc;
65: char **argv;
66: {
1.5 mpech 67: int ch;
1.1 deraadt 68: int width;
69: char *p;
70:
71: width = -1;
72: while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1)
73: switch (ch) {
74: case 'b':
75: count_bytes = 1;
76: break;
77: case 's':
78: split_words = 1;
79: break;
80: case 'w':
1.4 pjanzen 81: if ((width = atoi(optarg)) <= 0)
82: errx(1, "illegal width value.");
1.1 deraadt 83: break;
84: case '0': case '1': case '2': case '3': case '4':
85: case '5': case '6': case '7': case '8': case '9':
86: if (width == -1) {
87: p = argv[optind - 1];
88: if (p[0] == '-' && p[1] == ch && !p[2])
89: width = atoi(++p);
90: else
91: width = atoi(argv[optind] + 1);
92: }
93: break;
94: default:
95: (void)fprintf(stderr,
96: "usage: fold [-bs] [-w width] [file ...]\n");
97: exit(1);
98: }
99: argv += optind;
100: argc -= optind;
101:
102: if (width == -1)
103: width = DEFLINEWIDTH;
104:
105: if (!*argv)
106: fold(width);
107: else for (; *argv; ++argv)
108: if (!freopen(*argv, "r", stdin)) {
1.6 deraadt 109: err(1, "%s", *argv);
1.1 deraadt 110: /* NOTREACHED */
111: } else
112: fold(width);
113: exit(0);
114: }
115:
116: /*
117: * Fold the contents of standard input to fit within WIDTH columns
118: * (or bytes) and write to standard output.
119: *
120: * If split_words is set, split the line at the last space character
121: * on the line. This flag necessitates storing the line in a buffer
122: * until the current column > width, or a newline or EOF is read.
123: *
124: * The buffer can grow larger than WIDTH due to backspaces and carriage
125: * returns embedded in the input stream.
126: */
127: static void
128: fold(width)
1.5 mpech 129: int width;
1.1 deraadt 130: {
131: static char *buf = NULL;
132: static int buf_max = 0;
1.5 mpech 133: int ch, col;
134: int indx;
1.1 deraadt 135:
136: col = indx = 0;
137: while ((ch = getchar()) != EOF) {
138: if (ch == '\n') {
139: if (indx != 0)
1.6 deraadt 140: fwrite(buf, 1, indx, stdout);
1.1 deraadt 141: putchar('\n');
142: col = indx = 0;
143: continue;
144: }
145:
1.6 deraadt 146: col = new_column_position(col, ch);
1.1 deraadt 147: if (col > width) {
148: int i, last_space;
149:
150: if (split_words) {
151: for (i = 0, last_space = -1; i < indx; i++)
1.6 deraadt 152: if(buf[i] == ' ')
153: last_space = i;
1.1 deraadt 154: }
155:
156: if (split_words && last_space != -1) {
157: last_space++;
158:
1.6 deraadt 159: fwrite(buf, 1, last_space, stdout);
160: memmove(buf, buf+last_space, indx-last_space);
1.1 deraadt 161:
162: indx -= last_space;
163: col = 0;
164: for (i = 0; i < indx; i++) {
1.6 deraadt 165: col = new_column_position(col, buf[i]);
1.1 deraadt 166: }
167: } else {
1.6 deraadt 168: fwrite(buf, 1, indx, stdout);
1.1 deraadt 169: col = indx = 0;
170: }
171: putchar('\n');
172:
173: /* calculate the column position for the next line. */
1.6 deraadt 174: col = new_column_position(col, ch);
1.1 deraadt 175: }
176:
177: if (indx + 1 > buf_max) {
178: /* Allocate buffer in LINE_MAX increments */
179: buf_max += 2048;
1.6 deraadt 180: if((buf = realloc(buf, buf_max)) == NULL) {
181: err(1, NULL);
1.1 deraadt 182: /* NOTREACHED */
183: }
184: }
185: buf[indx++] = ch;
186: }
187:
188: if (indx != 0)
1.6 deraadt 189: fwrite(buf, 1, indx, stdout);
1.1 deraadt 190: }
191:
192: /*
193: * calculate the column position
194: */
195: static int
1.6 deraadt 196: new_column_position(col, ch)
1.1 deraadt 197: int col;
198: int ch;
199: {
200: if (!count_bytes) {
201: switch (ch) {
202: case '\b':
203: if (col > 0)
204: --col;
205: break;
206: case '\r':
207: col = 0;
208: break;
209: case '\t':
210: col = (col + 8) & ~7;
211: break;
212: default:
213: ++col;
214: break;
215: }
216: } else {
217: ++col;
218: }
219:
220: return col;
221: }