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vis.c revision 1.1 
      1 /*-
      2  * Copyright (c) 1989 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 char copyright[] =
     36 "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 static char sccsid[] = "@(#)vis.c	5.1 (Berkeley) 4/18/91";
     42 #endif /* not lint */
     43 
     44 #include <stdio.h>
     45 #include <vis.h>
     46 
     47 int eflags, fold, foldwidth=80, none, markeol, debug;
     48 
     49 main(argc, argv)
     50 	char *argv[];
     51 {
     52 	extern char *optarg;
     53 	extern int optind;
     54 	extern int errno;
     55 	FILE *fp;
     56 	int ch;
     57 
     58 	while ((ch = getopt(argc, argv, "nwctsobfF:ld")) != EOF)
     59 		switch((char)ch) {
     60 		case 'n':
     61 			none++;
     62 			break;
     63 		case 'w':
     64 			eflags |= VIS_WHITE;
     65 			break;
     66 		case 'c':
     67 			eflags |= VIS_CSTYLE;
     68 			break;
     69 		case 't':
     70 			eflags |= VIS_TAB;
     71 			break;
     72 		case 's':
     73 			eflags |= VIS_SAFE;
     74 			break;
     75 		case 'o':
     76 			eflags |= VIS_OCTAL;
     77 			break;
     78 		case 'b':
     79 			eflags |= VIS_NOSLASH;
     80 			break;
     81 		case 'F':
     82 			if ((foldwidth = atoi(optarg))<5) {
     83 				fprintf(stderr,
     84 				 "vis: can't fold lines to less than 5 cols\n");
     85 				exit(1);
     86 			}
     87 			/*FALLTHROUGH*/
     88 		case 'f':
     89 			fold++;		/* fold output lines to 80 cols */
     90 			break;		/* using hidden newline */
     91 		case 'l':
     92 			markeol++;	/* mark end of line with \$ */
     93 			break;
     94 #ifdef DEBUG
     95 		case 'd':
     96 			debug++;
     97 			break;
     98 #endif
     99 		case '?':
    100 		default:
    101 			fprintf(stderr,
    102 		"usage: vis [-nwctsobf] [-F foldwidth]\n");
    103 			exit(1);
    104 		}
    105 	argc -= optind;
    106 	argv += optind;
    107 
    108 	if (*argv)
    109 		while (*argv) {
    110 			if ((fp=fopen(*argv, "r")) != NULL)
    111 				process(fp, *argv);
    112 			else
    113 				fprintf(stderr, "vis: %s: %s\n", *argv,
    114 				    (char *)strerror(errno));
    115 			argv++;
    116 		}
    117 	else
    118 		process(stdin, "<stdin>");
    119 	exit(0);
    120 }
    121 
    122 process(fp, filename)
    123 	FILE *fp;
    124 	char *filename;
    125 {
    126 	static int col = 0;
    127 	register char *cp = "\0"+1;	/* so *(cp-1) starts out != '\n' */
    128 	register int c, rachar;
    129 	register char nc;
    130 	char buff[5];
    131 
    132 	c = getc(fp);
    133 	while (c != EOF) {
    134 		rachar = getc(fp);
    135 		if (none) {
    136 			cp = buff;
    137 			*cp++ = c;
    138 			if (c == '\\')
    139 				*cp++ = '\\';
    140 			*cp = '\0';
    141 		} else if (markeol && c == '\n') {
    142 			cp = buff;
    143 			if ((eflags & VIS_NOSLASH) == 0)
    144 				*cp++ = '\\';
    145 			*cp++ = '$';
    146 			*cp++ = '\n';
    147 			*cp = '\0';
    148 		} else
    149 			(void) vis(buff, (char)c, eflags, (char)rachar);
    150 
    151 		cp = buff;
    152 		if (fold) {
    153 #ifdef DEBUG
    154 			if (debug)
    155 				printf("<%02d,", col);
    156 #endif
    157 			col = foldit(cp, col, foldwidth);
    158 #ifdef DEBUG
    159 			if (debug)
    160 				printf("%02d>", col);
    161 #endif
    162 		}
    163 		do {
    164 			putchar(*cp);
    165 		} while (*++cp);
    166 		c = rachar;
    167 	}
    168 	/*
    169 	 * terminate partial line with a hidden newline
    170 	 */
    171 	if (fold && *(cp-1) != '\n')
    172 		printf("\\\n");
    173 }
    174