1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #include <sys/types.h> 39 #include <sys/tty.h> 40 41 #include <ctype.h> 42 #include <err.h> 43 #include <errno.h> 44 #include <locale.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <term.h> 49 #include <unistd.h> 50 51 /* Maximum number of tab stops allowed in table. */ 52 #define NSTOPS 20 53 54 #define NELEMS(a) (sizeof(a) / sizeof(a[0])) 55 56 /* Predefined formats, taken from IEEE Std 1003.1-2001. */ 57 static const struct { 58 const char *name; /* Format name used on cmd. line */ 59 long stops[NSTOPS]; /* Column positions */ 60 } formats[] = { 61 { "a", { 1, 10, 16, 36, 72 } }, 62 { "a2", { 1, 10, 16, 40, 72 } }, 63 { "c", { 1, 8, 12, 16, 20, 55 } }, 64 { "c2", { 1, 6, 10, 14, 49 } }, 65 { "c3", { 1, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 66 62, 67 } }, 67 { "f", { 1, 7, 11, 15, 19, 23 } }, 68 { "p", { 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 69 61 } }, 70 { "s", { 1, 10, 55 } }, 71 { "u", { 1, 12, 20, 44 } } 72 }; 73 74 static void gettabs(char *, long *, long *); 75 static int ttywidth(void); 76 static void usage(void); 77 78 int 79 main(int argc __unused, char *argv[]) 80 { 81 long cols, i, inc, j, margin, nstops, stops[NSTOPS]; 82 const char *cr, *ct, *st, *ML; 83 char area[1024], *ap, *arg, *end; 84 85 setlocale(LC_ALL, ""); 86 87 inc = 8; 88 margin = 0; 89 nstops = -1; 90 while ((arg = *++argv) != NULL && (*arg == '-' || *arg == '+')) { 91 if (*arg == '+') { 92 /* +m[n] or +[n] */ 93 if (*++arg == 'm') 94 arg++; 95 if (*arg != '\0') { 96 errno = 0; 97 margin = strtol(arg, &end, 10); 98 if (errno != 0 || *end != '\0' || margin < 0) 99 errx(1, "%s: invalid margin width", 100 arg); 101 } else 102 margin = 10; 103 } else if (isdigit(arg[1])) { 104 /* -n */ 105 errno = 0; 106 inc = strtol(arg + 1, &end, 10); 107 if (errno != 0 || *end != '\0' || inc < 0) 108 errx(1, "%s: invalid increment", arg + 1); 109 } else if (arg[1] == 'T') { 110 /* -Ttype or -T type */ 111 if (arg[2] != '\0') 112 setenv("TERM", arg + 2, 1); 113 else { 114 if ((arg = *++argv) == NULL) 115 usage(); 116 setenv("TERM", arg, 1); 117 } 118 } else if (arg[1] == '-') { 119 arg = *++argv; 120 break; 121 } else { 122 /* Predefined format */ 123 for (i = 0; i < (int)NELEMS(formats); i++) 124 if (strcmp(formats[i].name, arg + 1) == 0) 125 break; 126 if (i == NELEMS(formats)) 127 usage(); 128 for (j = nstops = 0; j < NSTOPS && 129 formats[i].stops[j] != 0; j++) 130 stops[nstops++] = formats[i].stops[j]; 131 } 132 } 133 134 if (arg != NULL) { 135 if (nstops != -1) 136 usage(); 137 gettabs(arg, stops, &nstops); 138 } 139 140 /* Initialise terminal, get the strings we need */ 141 setupterm(NULL, 1, NULL); 142 ap = area; 143 if ((ct = tgetstr("ct", &ap)) == NULL) 144 errx(1, "terminal cannot clear tabs"); 145 if ((st = tgetstr("st", &ap)) == NULL) 146 errx(1, "terminal cannot set tabs"); 147 if ((cr = tgetstr("cr", &ap)) == NULL) 148 cr = "\r"; 149 ML = tgetstr("ML", &ap); 150 cols = ttywidth(); 151 152 /* Clear all tabs. */ 153 putp(cr); 154 putp(ct); 155 156 /* 157 * Set soft margin. 158 * XXX Does this actually work? 159 */ 160 if (ML != NULL) { 161 printf("%*s", (int)margin, ""); 162 putp(ML); 163 } else if (margin != 0) 164 warnx("terminal cannot set left margin"); 165 166 /* Optionally output new tab stops. */ 167 if (nstops >= 0) { 168 printf("%*s", (int)stops[0] - 1, ""); 169 putp(st); 170 for (i = 1; i < nstops; i++) { 171 printf("%*s", (int)(stops[i] - stops[i - 1]), ""); 172 putp(st); 173 } 174 } else if (inc > 0) { 175 for (i = 0; i < cols / inc; i++) { 176 putp(st); 177 printf("%*s", (int)inc, ""); 178 } 179 putp(st); 180 } 181 putp(cr); 182 183 exit(0); 184 } 185 186 static void 187 usage(void) 188 { 189 190 fprintf(stderr, 191 "usage: tabs [-n|-a|-a2|-c|-c2|-c3|-f|-p|-s|-u] [+m[n]] [-T type]\n"); 192 fprintf(stderr, 193 " tabs [-T type] [+[n]] n1,[n2,...]\n"); 194 exit(1); 195 } 196 197 static void 198 gettabs(char *arg, long stops[], long *nstops) 199 { 200 char *tok, *end; 201 long last, stop; 202 203 for (last = *nstops = 0, tok = strtok(arg, ","); tok != NULL; 204 tok = strtok(NULL, ",")) { 205 if (*nstops >= NSTOPS) 206 errx(1, "too many tab stops (limit %d)", NSTOPS); 207 errno = 0; 208 stop = strtol(tok, &end, 10); 209 if (errno != 0 || *end != '\0' || stop <= 0) 210 errx(1, "%s: invalid tab stop", tok); 211 if (*tok == '+') { 212 if (tok == arg) 213 errx(1, "%s: first tab may not be relative", 214 tok); 215 stop += last; 216 } 217 if (last > stop) 218 errx(1, "cannot go backwards"); 219 last = stops[(*nstops)++] = stop; 220 } 221 } 222 223 static int 224 ttywidth(void) 225 { 226 struct winsize ws; 227 int width; 228 229 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) 230 width = ws.ws_col; 231 else if ((width = tgetnum("co")) == 0) { 232 width = 80; 233 warnx("cannot find terminal width; defaulted to %d", width); 234 } 235 236 return (width); 237 } 238