1 /* $OpenBSD: vis.c,v 1.21 2020/08/03 01:08:37 deraadt Exp $ */ 2 /* $NetBSD: vis.c,v 1.4 1994/12/20 16:13:03 jtc Exp $ */ 3 4 /*- 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <stdio.h> 34 #include <string.h> 35 #include <stdlib.h> 36 #include <unistd.h> 37 #include <limits.h> 38 #include <err.h> 39 #include <vis.h> 40 41 int eflags, fold, foldwidth=80, none, markeol; 42 43 #ifdef DEBUG 44 int debug; 45 #endif 46 47 int foldit(char *, int, int); 48 void process(FILE *); 49 __dead void usage(void); 50 51 int 52 main(int argc, char *argv[]) 53 { 54 const char *errstr; 55 FILE *fp; 56 int ch; 57 58 if (pledge("stdio rpath", NULL) == -1) 59 err(1, "pledge"); 60 61 while ((ch = getopt(argc, argv, "anwctsobfF:ld")) != -1) 62 switch(ch) { 63 case 'a': 64 eflags |= VIS_ALL; 65 break; 66 case 'n': 67 none = 1; 68 break; 69 case 'w': 70 eflags |= VIS_WHITE; 71 break; 72 case 'c': 73 eflags |= VIS_CSTYLE; 74 break; 75 case 't': 76 eflags |= VIS_TAB; 77 break; 78 case 's': 79 eflags |= VIS_SAFE; 80 break; 81 case 'o': 82 eflags |= VIS_OCTAL; 83 break; 84 case 'b': 85 eflags |= VIS_NOSLASH; 86 break; 87 case 'F': 88 foldwidth = strtonum(optarg, 1, INT_MAX, &errstr); 89 if (errstr) 90 errx(1, "%s: %s", optarg, errstr); 91 if (foldwidth < 5) 92 errx(1, "can't fold lines to less than 5 cols"); 93 /*FALLTHROUGH*/ 94 case 'f': 95 fold = 1; /* fold output lines to 80 cols */ 96 break; /* using hidden newline */ 97 case 'l': 98 markeol = 1; /* mark end of line with \$ */ 99 break; 100 #ifdef DEBUG 101 case 'd': 102 debug = 1; 103 break; 104 #endif 105 case '?': 106 default: 107 usage(); 108 } 109 argc -= optind; 110 argv += optind; 111 112 if (*argv) 113 while (*argv) { 114 if ((fp=fopen(*argv, "r")) != NULL) { 115 process(fp); 116 fclose(fp); 117 } else 118 warn("%s", *argv); 119 argv++; 120 } 121 else { 122 if (pledge("stdio", NULL) == -1) 123 err(1, "pledge"); 124 process(stdin); 125 } 126 exit(0); 127 } 128 129 void 130 process(FILE *fp) 131 { 132 static int col = 0; 133 char *cp = "\0"; 134 int c, rachar; 135 char buff[5]; 136 137 cp++; /* so *(cp-1) starts out != '\n' */ 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 } 180 181 __dead void 182 usage(void) 183 { 184 extern char *__progname; 185 186 fprintf(stderr, "usage: %s [-abcflnostw] [-F foldwidth] [file ...]\n", 187 __progname); 188 exit(1); 189 } 190