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 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 static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93"; 42 #endif /* not lint */ 43 44 #include <stdio.h> 45 /* 46 * expand - expand tabs to equivalent spaces 47 */ 48 int nstops; 49 int tabstops[100]; 50 51 main(argc, argv) 52 int argc; 53 char *argv[]; 54 { 55 register int c, column; 56 register int n; 57 58 argc--, argv++; 59 do { 60 while (argc > 0 && argv[0][0] == '-') { 61 getstops(argv[0]); 62 argc--, argv++; 63 } 64 if (argc > 0) { 65 if (freopen(argv[0], "r", stdin) == NULL) { 66 perror(argv[0]); 67 exit(1); 68 } 69 argc--, argv++; 70 } 71 column = 0; 72 for (;;) { 73 c = getc(stdin); 74 if (c == -1) 75 break; 76 switch (c) { 77 78 case '\t': 79 if (nstops == 0) { 80 do { 81 putchar(' '); 82 column++; 83 } while (column & 07); 84 continue; 85 } 86 if (nstops == 1) { 87 do { 88 putchar(' '); 89 column++; 90 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 91 continue; 92 } 93 for (n = 0; n < nstops; n++) 94 if (tabstops[n] > column) 95 break; 96 if (n == nstops) { 97 putchar(' '); 98 column++; 99 continue; 100 } 101 while (column < tabstops[n]) { 102 putchar(' '); 103 column++; 104 } 105 continue; 106 107 case '\b': 108 if (column) 109 column--; 110 putchar('\b'); 111 continue; 112 113 default: 114 putchar(c); 115 column++; 116 continue; 117 118 case '\n': 119 putchar(c); 120 column = 0; 121 continue; 122 } 123 } 124 } while (argc > 0); 125 exit(0); 126 } 127 128 getstops(cp) 129 register char *cp; 130 { 131 register int i; 132 133 nstops = 0; 134 cp++; 135 for (;;) { 136 i = 0; 137 while (*cp >= '0' && *cp <= '9') 138 i = i * 10 + *cp++ - '0'; 139 if (i <= 0 || i > 256) { 140 bad: 141 fprintf(stderr, "Bad tab stop spec\n"); 142 exit(1); 143 } 144 if (nstops > 0 && i <= tabstops[nstops-1]) 145 goto bad; 146 tabstops[nstops++] = i; 147 if (*cp == 0) 148 break; 149 if (*cp++ != ',') 150 goto bad; 151 } 152 } 153