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vis.c revision 1.5 
      1 /*	$NetBSD: vis.c,v 1.5 1997/10/20 03:06:48 lukem Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     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 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1989, 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[] = "@(#)vis.c	8.1 (Berkeley) 6/6/93";
     45 #endif
     46 __RCSID("$NetBSD: vis.c,v 1.5 1997/10/20 03:06:48 lukem Exp $");
     47 #endif /* not lint */
     48 
     49 #include <stdio.h>
     50 #include <string.h>
     51 #include <stdlib.h>
     52 #include <unistd.h>
     53 #include <err.h>
     54 #include <vis.h>
     55 
     56 int eflags, fold, foldwidth=80, none, markeol, debug;
     57 
     58 int foldit __P((char *, int, int));
     59 int main __P((int, char **));
     60 void process __P((FILE *, char *));
     61 
     62 int
     63 main(argc, argv)
     64 	int argc;
     65 	char *argv[];
     66 {
     67 	FILE *fp;
     68 	int ch;
     69 
     70 	while ((ch = getopt(argc, argv, "nwctsobfF:ld")) != -1)
     71 		switch((char)ch) {
     72 		case 'n':
     73 			none++;
     74 			break;
     75 		case 'w':
     76 			eflags |= VIS_WHITE;
     77 			break;
     78 		case 'c':
     79 			eflags |= VIS_CSTYLE;
     80 			break;
     81 		case 't':
     82 			eflags |= VIS_TAB;
     83 			break;
     84 		case 's':
     85 			eflags |= VIS_SAFE;
     86 			break;
     87 		case 'o':
     88 			eflags |= VIS_OCTAL;
     89 			break;
     90 		case 'b':
     91 			eflags |= VIS_NOSLASH;
     92 			break;
     93 		case 'F':
     94 			if ((foldwidth = atoi(optarg))<5) {
     95 				errx(1, "can't fold lines to less than 5 cols");
     96 				/* NOTREACHED */
     97 			}
     98 			/*FALLTHROUGH*/
     99 		case 'f':
    100 			fold++;		/* fold output lines to 80 cols */
    101 			break;		/* using hidden newline */
    102 		case 'l':
    103 			markeol++;	/* mark end of line with \$ */
    104 			break;
    105 #ifdef DEBUG
    106 		case 'd':
    107 			debug++;
    108 			break;
    109 #endif
    110 		case '?':
    111 		default:
    112 			fprintf(stderr,
    113 		"usage: vis [-nwctsobf] [-F foldwidth]\n");
    114 			exit(1);
    115 		}
    116 	argc -= optind;
    117 	argv += optind;
    118 
    119 	if (*argv)
    120 		while (*argv) {
    121 			if ((fp=fopen(*argv, "r")) != NULL)
    122 				process(fp, *argv);
    123 			else
    124 				warn("%s", *argv);
    125 			argv++;
    126 		}
    127 	else
    128 		process(stdin, "<stdin>");
    129 	exit(0);
    130 }
    131 
    132 void
    133 process(fp, filename)
    134 	FILE *fp;
    135 	char *filename;
    136 {
    137 	static int col = 0;
    138 	char *cp = "\0"+1;	/* so *(cp-1) starts out != '\n' */
    139 	int c, rachar;
    140 	char buff[5];
    141 
    142 	c = getc(fp);
    143 	while (c != EOF) {
    144 		rachar = getc(fp);
    145 		if (none) {
    146 			cp = buff;
    147 			*cp++ = c;
    148 			if (c == '\\')
    149 				*cp++ = '\\';
    150 			*cp = '\0';
    151 		} else if (markeol && c == '\n') {
    152 			cp = buff;
    153 			if ((eflags & VIS_NOSLASH) == 0)
    154 				*cp++ = '\\';
    155 			*cp++ = '$';
    156 			*cp++ = '\n';
    157 			*cp = '\0';
    158 		} else
    159 			(void) vis(buff, (char)c, eflags, (char)rachar);
    160 
    161 		cp = buff;
    162 		if (fold) {
    163 #ifdef DEBUG
    164 			if (debug)
    165 				printf("<%02d,", col);
    166 #endif
    167 			col = foldit(cp, col, foldwidth);
    168 #ifdef DEBUG
    169 			if (debug)
    170 				printf("%02d>", col);
    171 #endif
    172 		}
    173 		do {
    174 			putchar(*cp);
    175 		} while (*++cp);
    176 		c = rachar;
    177 	}
    178 	/*
    179 	 * terminate partial line with a hidden newline
    180 	 */
    181 	if (fold && *(cp-1) != '\n')
    182 		printf("\\\n");
    183 }
    184