1 /* 2 * Copyright (c) 1980, 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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1980, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93"; 43 #endif 44 #endif /* not lint */ 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <locale.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <unistd.h> 54 55 /* 56 * expand - expand tabs to equivalent spaces 57 */ 58 int nstops; 59 int tabstops[100]; 60 61 static void getstops(char *); 62 static void usage(void); 63 64 int 65 main(int argc, char *argv[]) 66 { 67 int c, column; 68 int n; 69 int rval; 70 71 setlocale(LC_CTYPE, ""); 72 73 /* handle obsolete syntax */ 74 while (argc > 1 && argv[1][0] == '-' && 75 isdigit((unsigned char)argv[1][1])) { 76 getstops(&argv[1][1]); 77 argc--; argv++; 78 } 79 80 while ((c = getopt (argc, argv, "t:")) != -1) { 81 switch (c) { 82 case 't': 83 getstops(optarg); 84 break; 85 case '?': 86 default: 87 usage(); 88 /* NOTREACHED */ 89 } 90 } 91 argc -= optind; 92 argv += optind; 93 94 rval = 0; 95 do { 96 if (argc > 0) { 97 if (freopen(argv[0], "r", stdin) == NULL) { 98 warn("%s", argv[0]); 99 rval = 1; 100 argc--, argv++; 101 continue; 102 } 103 argc--, argv++; 104 } 105 column = 0; 106 while ((c = getchar()) != EOF) { 107 switch (c) { 108 case '\t': 109 if (nstops == 0) { 110 do { 111 putchar(' '); 112 column++; 113 } while (column & 07); 114 continue; 115 } 116 if (nstops == 1) { 117 do { 118 putchar(' '); 119 column++; 120 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 121 continue; 122 } 123 for (n = 0; n < nstops; n++) 124 if (tabstops[n] > column) 125 break; 126 if (n == nstops) { 127 putchar(' '); 128 column++; 129 continue; 130 } 131 while (column < tabstops[n]) { 132 putchar(' '); 133 column++; 134 } 135 continue; 136 137 case '\b': 138 if (column) 139 column--; 140 putchar('\b'); 141 continue; 142 143 default: 144 putchar(c); 145 if (isprint(c)) 146 column++; 147 continue; 148 149 case '\n': 150 putchar(c); 151 column = 0; 152 continue; 153 } 154 } 155 } while (argc > 0); 156 exit(rval); 157 } 158 159 static void 160 getstops(char *cp) 161 { 162 int i; 163 164 nstops = 0; 165 for (;;) { 166 i = 0; 167 while (*cp >= '0' && *cp <= '9') 168 i = i * 10 + *cp++ - '0'; 169 if (i <= 0) 170 errx(1, "bad tab stop spec"); 171 if (nstops > 0 && i <= tabstops[nstops-1]) 172 errx(1, "bad tab stop spec"); 173 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 174 errx(1, "too many tab stops"); 175 tabstops[nstops++] = i; 176 if (*cp == 0) 177 break; 178 if (*cp != ',' && !isblank((unsigned char)*cp)) 179 errx(1, "bad tab stop spec"); 180 cp++; 181 } 182 } 183 184 static void 185 usage(void) 186 { 187 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 188 exit(1); 189 } 190