Annotation of src/usr.bin/fold/fold.c, Revision 1.9
1.9 ! deraadt 1: /* $OpenBSD: fold.c,v 1.8 2003/06/10 22:20:46 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
1.9 ! deraadt 46: static char rcsid[] = "$OpenBSD: fold.c,v 1.8 2003/06/10 22:20:46 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:
1.9 ! deraadt 57: static void fold(int);
! 58: static int new_column_position(int, int);
1.1 deraadt 59: int count_bytes = 0;
60: int split_words = 0;
61:
62: int
1.8 deraadt 63: main(int argc, char *argv[])
1.1 deraadt 64: {
1.5 mpech 65: int ch;
1.1 deraadt 66: int width;
67: char *p;
68:
69: width = -1;
70: while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1)
71: switch (ch) {
72: case 'b':
73: count_bytes = 1;
74: break;
75: case 's':
76: split_words = 1;
77: break;
78: case 'w':
1.4 pjanzen 79: if ((width = atoi(optarg)) <= 0)
80: errx(1, "illegal width value.");
1.1 deraadt 81: break;
82: case '0': case '1': case '2': case '3': case '4':
83: case '5': case '6': case '7': case '8': case '9':
84: if (width == -1) {
85: p = argv[optind - 1];
86: if (p[0] == '-' && p[1] == ch && !p[2])
87: width = atoi(++p);
88: else
89: width = atoi(argv[optind] + 1);
90: }
91: break;
92: default:
93: (void)fprintf(stderr,
94: "usage: fold [-bs] [-w width] [file ...]\n");
95: exit(1);
96: }
97: argv += optind;
98: argc -= optind;
99:
100: if (width == -1)
101: width = DEFLINEWIDTH;
102:
103: if (!*argv)
104: fold(width);
105: else for (; *argv; ++argv)
106: if (!freopen(*argv, "r", stdin)) {
1.6 deraadt 107: err(1, "%s", *argv);
1.1 deraadt 108: /* NOTREACHED */
109: } else
110: fold(width);
111: exit(0);
112: }
113:
114: /*
115: * Fold the contents of standard input to fit within WIDTH columns
116: * (or bytes) and write to standard output.
117: *
118: * If split_words is set, split the line at the last space character
119: * on the line. This flag necessitates storing the line in a buffer
120: * until the current column > width, or a newline or EOF is read.
121: *
122: * The buffer can grow larger than WIDTH due to backspaces and carriage
123: * returns embedded in the input stream.
124: */
125: static void
1.8 deraadt 126: fold(int width)
1.1 deraadt 127: {
128: static char *buf = NULL;
129: static int buf_max = 0;
1.5 mpech 130: int ch, col;
131: int indx;
1.1 deraadt 132:
133: col = indx = 0;
134: while ((ch = getchar()) != EOF) {
135: if (ch == '\n') {
136: if (indx != 0)
1.6 deraadt 137: fwrite(buf, 1, indx, stdout);
1.1 deraadt 138: putchar('\n');
139: col = indx = 0;
140: continue;
141: }
142:
1.6 deraadt 143: col = new_column_position(col, ch);
1.1 deraadt 144: if (col > width) {
145: int i, last_space;
146:
147: if (split_words) {
148: for (i = 0, last_space = -1; i < indx; i++)
1.6 deraadt 149: if(buf[i] == ' ')
150: last_space = i;
1.1 deraadt 151: }
152:
153: if (split_words && last_space != -1) {
154: last_space++;
155:
1.6 deraadt 156: fwrite(buf, 1, last_space, stdout);
157: memmove(buf, buf+last_space, indx-last_space);
1.1 deraadt 158:
159: indx -= last_space;
160: col = 0;
161: for (i = 0; i < indx; i++) {
1.6 deraadt 162: col = new_column_position(col, buf[i]);
1.1 deraadt 163: }
164: } else {
1.6 deraadt 165: fwrite(buf, 1, indx, stdout);
1.1 deraadt 166: col = indx = 0;
167: }
168: putchar('\n');
169:
170: /* calculate the column position for the next line. */
1.6 deraadt 171: col = new_column_position(col, ch);
1.1 deraadt 172: }
173:
174: if (indx + 1 > buf_max) {
175: /* Allocate buffer in LINE_MAX increments */
176: buf_max += 2048;
1.6 deraadt 177: if((buf = realloc(buf, buf_max)) == NULL) {
178: err(1, NULL);
1.1 deraadt 179: /* NOTREACHED */
180: }
181: }
182: buf[indx++] = ch;
183: }
184:
185: if (indx != 0)
1.6 deraadt 186: fwrite(buf, 1, indx, stdout);
1.1 deraadt 187: }
188:
189: /*
190: * calculate the column position
191: */
192: static int
1.8 deraadt 193: new_column_position(int col, int ch)
1.1 deraadt 194: {
195: if (!count_bytes) {
196: switch (ch) {
197: case '\b':
198: if (col > 0)
199: --col;
200: break;
201: case '\r':
202: col = 0;
203: break;
204: case '\t':
205: col = (col + 8) & ~7;
206: break;
207: default:
208: ++col;
209: break;
210: }
211: } else {
212: ++col;
213: }
214:
215: return col;
216: }
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