1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)vis.c 8.1 (Berkeley) 6/6/93 31 * $FreeBSD: src/usr.bin/vis/vis.c,v 1.6 1999/08/28 01:07:25 peter Exp $ 32 * $DragonFly: src/usr.bin/vis/vis.c,v 1.4 2008/10/16 01:52:34 swildner Exp $ 33 */ 34 35 #include <err.h> 36 #include <locale.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <unistd.h> 40 #include <vis.h> 41 42 int eflags, fold, foldwidth=80, none, markeol, debug; 43 44 void process(FILE *, char *filename); 45 static void usage(void); 46 extern int foldit(char *, int, int); 47 48 int 49 main(int argc, char **argv) 50 { 51 FILE *fp; 52 int ch; 53 54 (void) setlocale(LC_CTYPE, ""); 55 56 while ((ch = getopt(argc, argv, "nwctsobfF:ld")) != -1) 57 switch((char)ch) { 58 case 'n': 59 none++; 60 break; 61 case 'w': 62 eflags |= VIS_WHITE; 63 break; 64 case 'c': 65 eflags |= VIS_CSTYLE; 66 break; 67 case 't': 68 eflags |= VIS_TAB; 69 break; 70 case 's': 71 eflags |= VIS_SAFE; 72 break; 73 case 'o': 74 eflags |= VIS_OCTAL; 75 break; 76 case 'b': 77 eflags |= VIS_NOSLASH; 78 break; 79 case 'F': 80 if ((foldwidth = atoi(optarg))<5) 81 errx(1, "can't fold lines to less than 5 cols"); 82 /*FALLTHROUGH*/ 83 case 'f': 84 fold++; /* fold output lines to 80 cols */ 85 break; /* using hidden newline */ 86 case 'l': 87 markeol++; /* mark end of line with \$ */ 88 break; 89 #ifdef DEBUG 90 case 'd': 91 debug++; 92 break; 93 #endif 94 case '?': 95 default: 96 usage(); 97 } 98 argc -= optind; 99 argv += optind; 100 101 if (*argv) 102 while (*argv) { 103 if ((fp=fopen(*argv, "r")) != NULL) 104 process(fp, *argv); 105 else 106 warn("%s", *argv); 107 argv++; 108 } 109 else 110 process(stdin, "<stdin>"); 111 exit(0); 112 } 113 114 115 static void 116 usage(void) 117 { 118 #ifdef DEBUG 119 fprintf(stderr, "usage: vis [-cbflnostwd] [-F foldwidth] [file ...]\n"); 120 #else 121 fprintf(stderr, "usage: vis [-cbflnostw] [-F foldwidth] [file ...]\n"); 122 #endif 123 exit(1); 124 } 125 126 void 127 process(FILE *fp, char *filename) 128 { 129 static int col = 0; 130 char *cp = "\0"+1; /* so *(cp-1) starts out != '\n' */ 131 int c, rachar; 132 char buff[5]; 133 134 c = getc(fp); 135 while (c != EOF) { 136 rachar = getc(fp); 137 if (none) { 138 cp = buff; 139 *cp++ = c; 140 if (c == '\\') 141 *cp++ = '\\'; 142 *cp = '\0'; 143 } else if (markeol && c == '\n') { 144 cp = buff; 145 if ((eflags & VIS_NOSLASH) == 0) 146 *cp++ = '\\'; 147 *cp++ = '$'; 148 *cp++ = '\n'; 149 *cp = '\0'; 150 } else 151 (void) vis(buff, (char)c, eflags, (char)rachar); 152 153 cp = buff; 154 if (fold) { 155 #ifdef DEBUG 156 if (debug) 157 printf("<%02d,", col); 158 #endif 159 col = foldit(cp, col, foldwidth); 160 #ifdef DEBUG 161 if (debug) 162 printf("%02d>", col); 163 #endif 164 } 165 do { 166 putchar(*cp); 167 } while (*++cp); 168 c = rachar; 169 } 170 /* 171 * terminate partial line with a hidden newline 172 */ 173 if (fold && *(cp-1) != '\n') 174 printf("\\\n"); 175 } 176