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. 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 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)vis.c 8.1 (Berkeley) 6/6/93 35 * $FreeBSD: src/usr.bin/vis/vis.c,v 1.6 1999/08/28 01:07:25 peter Exp $ 36 * $DragonFly: src/usr.bin/vis/vis.c,v 1.4 2008/10/16 01:52:34 swildner Exp $ 37 */ 38 39 #include <err.h> 40 #include <locale.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <unistd.h> 44 #include <vis.h> 45 46 int eflags, fold, foldwidth=80, none, markeol, debug; 47 48 void process(FILE *, char *filename); 49 static void usage(void); 50 extern int foldit(char *, int, int); 51 52 int 53 main(int argc, char **argv) 54 { 55 FILE *fp; 56 int ch; 57 58 (void) setlocale(LC_CTYPE, ""); 59 60 while ((ch = getopt(argc, argv, "nwctsobfF:ld")) != -1) 61 switch((char)ch) { 62 case 'n': 63 none++; 64 break; 65 case 'w': 66 eflags |= VIS_WHITE; 67 break; 68 case 'c': 69 eflags |= VIS_CSTYLE; 70 break; 71 case 't': 72 eflags |= VIS_TAB; 73 break; 74 case 's': 75 eflags |= VIS_SAFE; 76 break; 77 case 'o': 78 eflags |= VIS_OCTAL; 79 break; 80 case 'b': 81 eflags |= VIS_NOSLASH; 82 break; 83 case 'F': 84 if ((foldwidth = atoi(optarg))<5) 85 errx(1, "can't fold lines to less than 5 cols"); 86 /*FALLTHROUGH*/ 87 case 'f': 88 fold++; /* fold output lines to 80 cols */ 89 break; /* using hidden newline */ 90 case 'l': 91 markeol++; /* mark end of line with \$ */ 92 break; 93 #ifdef DEBUG 94 case 'd': 95 debug++; 96 break; 97 #endif 98 case '?': 99 default: 100 usage(); 101 } 102 argc -= optind; 103 argv += optind; 104 105 if (*argv) 106 while (*argv) { 107 if ((fp=fopen(*argv, "r")) != NULL) 108 process(fp, *argv); 109 else 110 warn("%s", *argv); 111 argv++; 112 } 113 else 114 process(stdin, "<stdin>"); 115 exit(0); 116 } 117 118 119 static void 120 usage(void) 121 { 122 #ifdef DEBUG 123 fprintf(stderr, "usage: vis [-cbflnostwd] [-F foldwidth] [file ...]\n"); 124 #else 125 fprintf(stderr, "usage: vis [-cbflnostw] [-F foldwidth] [file ...]\n"); 126 #endif 127 exit(1); 128 } 129 130 void 131 process(FILE *fp, char *filename) 132 { 133 static int col = 0; 134 char *cp = "\0"+1; /* so *(cp-1) starts out != '\n' */ 135 int c, rachar; 136 char buff[5]; 137 138 c = getc(fp); 139 while (c != EOF) { 140 rachar = getc(fp); 141 if (none) { 142 cp = buff; 143 *cp++ = c; 144 if (c == '\\') 145 *cp++ = '\\'; 146 *cp = '\0'; 147 } else if (markeol && c == '\n') { 148 cp = buff; 149 if ((eflags & VIS_NOSLASH) == 0) 150 *cp++ = '\\'; 151 *cp++ = '$'; 152 *cp++ = '\n'; 153 *cp = '\0'; 154 } else 155 (void) vis(buff, (char)c, eflags, (char)rachar); 156 157 cp = buff; 158 if (fold) { 159 #ifdef DEBUG 160 if (debug) 161 printf("<%02d,", col); 162 #endif 163 col = foldit(cp, col, foldwidth); 164 #ifdef DEBUG 165 if (debug) 166 printf("%02d>", col); 167 #endif 168 } 169 do { 170 putchar(*cp); 171 } while (*++cp); 172 c = rachar; 173 } 174 /* 175 * terminate partial line with a hidden newline 176 */ 177 if (fold && *(cp-1) != '\n') 178 printf("\\\n"); 179 } 180