1 /*- 2 * Copyright (c) 2002 Tim J. Robbins. 3 * 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/usr.bin/tabs/tabs.c,v 1.3 2002/06/08 11:33:22 tjr Exp $ 27 * $DragonFly: src/usr.bin/tabs/tabs.c,v 1.2 2006/01/12 13:43:11 corecode Exp $ 28 */ 29 30 /* 31 * tabs -- set terminal tabs 32 * 33 * This utility displays a series of characters that clears the terminal 34 * hardware tab settings, then initialises them to specified values, 35 * and optionally sets a soft margin. 36 */ 37 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 if (setenv("TERM", arg + 2, 1) == -1) 113 err(1, "setenv: cannot set TERM=%s", arg + 2); 114 } 115 else { 116 if ((arg = *++argv) == NULL) 117 usage(); 118 if (setenv("TERM", arg, 1) == -1) 119 err(1, "setenv: cannot set TERM=%s", arg); 120 } 121 } else if (arg[1] == '-') { 122 arg = *++argv; 123 break; 124 } else { 125 /* Predefined format */ 126 for (i = 0; i < (int)NELEMS(formats); i++) 127 if (strcmp(formats[i].name, arg + 1) == 0) 128 break; 129 if (i == NELEMS(formats)) 130 usage(); 131 for (j = nstops = 0; j < NSTOPS && 132 formats[i].stops[j] != 0; j++) 133 stops[nstops++] = formats[i].stops[j]; 134 } 135 } 136 137 if (arg != NULL) { 138 if (nstops != -1) 139 usage(); 140 gettabs(arg, stops, &nstops); 141 } 142 143 /* Initialise terminal, get the strings we need */ 144 setupterm(NULL, 1, NULL); 145 ap = area; 146 if ((ct = tgetstr("ct", &ap)) == NULL) 147 errx(1, "terminal cannot clear tabs"); 148 if ((st = tgetstr("st", &ap)) == NULL) 149 errx(1, "terminal cannot set tabs"); 150 if ((cr = tgetstr("cr", &ap)) == NULL) 151 cr = "\r"; 152 ML = tgetstr("ML", &ap); 153 cols = ttywidth(); 154 155 /* Clear all tabs. */ 156 putp(cr); 157 putp(ct); 158 159 /* 160 * Set soft margin. 161 * XXX Does this actually work? 162 */ 163 if (ML != NULL) { 164 printf("%*s", (int)margin, ""); 165 putp(ML); 166 } else if (margin != 0) 167 warnx("terminal cannot set left margin"); 168 169 /* Optionally output new tab stops. */ 170 if (nstops >= 0) { 171 printf("%*s", (int)stops[0] - 1, ""); 172 putp(st); 173 for (i = 1; i < nstops; i++) { 174 printf("%*s", (int)(stops[i] - stops[i - 1]), ""); 175 putp(st); 176 } 177 } else if (inc > 0) { 178 for (i = 0; i < cols / inc; i++) { 179 putp(st); 180 printf("%*s", (int)inc, ""); 181 } 182 putp(st); 183 } 184 putp(cr); 185 186 exit(0); 187 } 188 189 static void 190 usage(void) 191 { 192 193 fprintf(stderr, 194 "usage: tabs [-n|-a|-a2|-c|-c2|-c3|-f|-p|-s|-u] [+m[n]] [-T type]\n"); 195 fprintf(stderr, 196 " tabs [-T type] [+[n]] n1,[n2,...]\n"); 197 exit(1); 198 } 199 200 static void 201 gettabs(char *arg, long stops[], long *nstops) 202 { 203 char *tok, *end; 204 long last, stop; 205 206 for (last = *nstops = 0, tok = strtok(arg, ","); tok != NULL; 207 tok = strtok(NULL, ",")) { 208 if (*nstops >= NSTOPS) 209 errx(1, "too many tab stops (limit %d)", NSTOPS); 210 errno = 0; 211 stop = strtol(tok, &end, 10); 212 if (errno != 0 || *end != '\0' || stop <= 0) 213 errx(1, "%s: invalid tab stop", tok); 214 if (*tok == '+') { 215 if (tok == arg) 216 errx(1, "%s: first tab may not be relative", 217 tok); 218 stop += last; 219 } 220 if (last > stop) 221 errx(1, "cannot go backwards"); 222 last = stops[(*nstops)++] = stop; 223 } 224 } 225 226 static int 227 ttywidth(void) 228 { 229 struct winsize ws; 230 int width; 231 232 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) 233 width = ws.ws_col; 234 else if ((width = tgetnum("co")) == 0) { 235 width = 80; 236 warnx("cannot find terminal width; defaulted to %d", width); 237 } 238 239 return (width); 240 } 241