1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002 Tim J. Robbins. 5 * 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * tabs -- set terminal tabs 31 * 32 * This utility displays a series of characters that clears the terminal 33 * hardware tab settings, then initialises them to specified values, 34 * and optionally sets a soft margin. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/types.h> 41 #include <sys/tty.h> 42 43 #include <ctype.h> 44 #include <err.h> 45 #include <errno.h> 46 #include <locale.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <term.h> 51 #include <unistd.h> 52 53 /* Maximum number of tab stops allowed in table. */ 54 #define NSTOPS 20 55 56 #define NELEMS(a) (sizeof(a) / sizeof(a[0])) 57 58 /* Predefined formats, taken from IEEE Std 1003.1-2001. */ 59 static const struct { 60 const char *name; /* Format name used on cmd. line */ 61 long stops[NSTOPS]; /* Column positions */ 62 } formats[] = { 63 { "a", { 1, 10, 16, 36, 72 } }, 64 { "a2", { 1, 10, 16, 40, 72 } }, 65 { "c", { 1, 8, 12, 16, 20, 55 } }, 66 { "c2", { 1, 6, 10, 14, 49 } }, 67 { "c3", { 1, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 68 62, 67 } }, 69 { "f", { 1, 7, 11, 15, 19, 23 } }, 70 { "p", { 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 71 61 } }, 72 { "s", { 1, 10, 55 } }, 73 { "u", { 1, 12, 20, 44 } } 74 }; 75 76 static void gettabs(char *, long *, long *); 77 static int ttywidth(void); 78 static void usage(void); 79 80 int 81 main(int argc __unused, char *argv[]) 82 { 83 long cols, i, inc, j, margin, nstops, stops[NSTOPS]; 84 const char *cr, *ct, *st, *ML; 85 char area[1024], *ap, *arg, *end; 86 87 setlocale(LC_ALL, ""); 88 89 inc = 8; 90 margin = 0; 91 nstops = -1; 92 while ((arg = *++argv) != NULL && (*arg == '-' || *arg == '+')) { 93 if (*arg == '+') { 94 /* +m[n] or +[n] */ 95 if (*++arg == 'm') 96 arg++; 97 if (*arg != '\0') { 98 errno = 0; 99 margin = strtol(arg, &end, 10); 100 if (errno != 0 || *end != '\0' || margin < 0) 101 errx(1, "%s: invalid margin width", 102 arg); 103 } else 104 margin = 10; 105 } else if (isdigit(arg[1])) { 106 /* -n */ 107 errno = 0; 108 inc = strtol(arg + 1, &end, 10); 109 if (errno != 0 || *end != '\0' || inc < 0) 110 errx(1, "%s: invalid increment", arg + 1); 111 } else if (arg[1] == 'T') { 112 /* -Ttype or -T type */ 113 if (arg[2] != '\0') 114 setenv("TERM", arg + 2, 1); 115 else { 116 if ((arg = *++argv) == NULL) 117 usage(); 118 setenv("TERM", arg, 1); 119 } 120 } else if (arg[1] == '-') { 121 arg = *++argv; 122 break; 123 } else { 124 /* Predefined format */ 125 for (i = 0; i < (int)NELEMS(formats); i++) 126 if (strcmp(formats[i].name, arg + 1) == 0) 127 break; 128 if (i == NELEMS(formats)) 129 usage(); 130 for (j = nstops = 0; j < NSTOPS && 131 formats[i].stops[j] != 0; j++) 132 stops[nstops++] = formats[i].stops[j]; 133 } 134 } 135 136 if (arg != NULL) { 137 if (nstops != -1) 138 usage(); 139 gettabs(arg, stops, &nstops); 140 } 141 142 /* Initialise terminal, get the strings we need */ 143 setupterm(NULL, 1, NULL); 144 ap = area; 145 if ((ct = tgetstr("ct", &ap)) == NULL) 146 errx(1, "terminal cannot clear tabs"); 147 if ((st = tgetstr("st", &ap)) == NULL) 148 errx(1, "terminal cannot set tabs"); 149 if ((cr = tgetstr("cr", &ap)) == NULL) 150 cr = "\r"; 151 ML = tgetstr("ML", &ap); 152 cols = ttywidth(); 153 154 /* Clear all tabs. */ 155 putp(cr); 156 putp(ct); 157 158 /* 159 * Set soft margin. 160 * XXX Does this actually work? 161 */ 162 if (ML != NULL) { 163 printf("%*s", (int)margin, ""); 164 putp(ML); 165 } else if (margin != 0) 166 warnx("terminal cannot set left margin"); 167 168 /* Optionally output new tab stops. */ 169 if (nstops >= 0) { 170 printf("%*s", (int)stops[0] - 1, ""); 171 putp(st); 172 for (i = 1; i < nstops; i++) { 173 printf("%*s", (int)(stops[i] - stops[i - 1]), ""); 174 putp(st); 175 } 176 } else if (inc > 0) { 177 for (i = 0; i < cols / inc; i++) { 178 putp(st); 179 printf("%*s", (int)inc, ""); 180 } 181 putp(st); 182 } 183 putp(cr); 184 185 exit(0); 186 } 187 188 static void 189 usage(void) 190 { 191 192 fprintf(stderr, 193 "usage: tabs [-n|-a|-a2|-c|-c2|-c3|-f|-p|-s|-u] [+m[n]] [-T type]\n"); 194 fprintf(stderr, 195 " tabs [-T type] [+[n]] n1,[n2,...]\n"); 196 exit(1); 197 } 198 199 static void 200 gettabs(char *arg, long stops[], long *nstops) 201 { 202 char *tok, *end; 203 long last, stop; 204 205 for (last = *nstops = 0, tok = strtok(arg, ","); tok != NULL; 206 tok = strtok(NULL, ",")) { 207 if (*nstops >= NSTOPS) 208 errx(1, "too many tab stops (limit %d)", NSTOPS); 209 errno = 0; 210 stop = strtol(tok, &end, 10); 211 if (errno != 0 || *end != '\0' || stop <= 0) 212 errx(1, "%s: invalid tab stop", tok); 213 if (*tok == '+') { 214 if (tok == arg) 215 errx(1, "%s: first tab may not be relative", 216 tok); 217 stop += last; 218 } 219 if (last > stop) 220 errx(1, "cannot go backwards"); 221 last = stops[(*nstops)++] = stop; 222 } 223 } 224 225 static int 226 ttywidth(void) 227 { 228 struct winsize ws; 229 int width; 230 231 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) 232 width = ws.ws_col; 233 else if ((width = tgetnum("co")) == 0) { 234 width = 80; 235 warnx("cannot find terminal width; defaulted to %d", width); 236 } 237 238 return (width); 239 } 240