1 /* $OpenBSD: unexpand.c,v 1.13 2016/10/11 16:22:15 millert Exp $ */ 2 /* $NetBSD: unexpand.c,v 1.5 1994/12/24 17:08:05 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1980, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * unexpand - put tabs into a file replacing blanks 35 */ 36 #include <stdbool.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 char genbuf[BUFSIZ]; 43 char linebuf[BUFSIZ]; 44 45 void tabify(bool); 46 47 int 48 main(int argc, char *argv[]) 49 { 50 bool all = false; 51 char *cp; 52 53 if (pledge("stdio rpath", NULL) == -1) { 54 perror("pledge"); 55 exit(1); 56 } 57 58 argc--, argv++; 59 if (argc > 0 && argv[0][0] == '-') { 60 if (strcmp(argv[0], "-a") != 0) { 61 fprintf(stderr, "usage: unexpand [-a] [file ...]\n"); 62 exit(1); 63 } 64 all = true; 65 argc--, argv++; 66 } 67 do { 68 if (argc > 0) { 69 if (freopen(argv[0], "r", stdin) == NULL) { 70 perror(argv[0]); 71 exit(1); 72 } 73 argc--, argv++; 74 } 75 while (fgets(genbuf, BUFSIZ, stdin) != NULL) { 76 for (cp = linebuf; *cp; cp++) 77 continue; 78 if (cp > linebuf) 79 cp[-1] = 0; 80 tabify(all); 81 printf("%s", linebuf); 82 } 83 } while (argc > 0); 84 exit(0); 85 } 86 87 void 88 tabify(bool all) 89 { 90 char *cp, *dp; 91 int dcol; 92 int ocol; 93 size_t len; 94 95 ocol = 0; 96 dcol = 0; 97 cp = genbuf; 98 dp = linebuf; 99 len = sizeof linebuf; 100 101 for (;;) { 102 switch (*cp) { 103 104 case ' ': 105 dcol++; 106 break; 107 108 case '\t': 109 dcol += 8; 110 dcol &= ~07; 111 break; 112 113 default: 114 while (((ocol + 8) &~ 07) <= dcol) { 115 if (ocol + 1 == dcol) 116 break; 117 if (len > 1) { 118 *dp++ = '\t'; 119 len--; 120 } 121 ocol += 8; 122 ocol &= ~07; 123 } 124 while (ocol < dcol) { 125 if (len > 1) { 126 *dp++ = ' '; 127 len--; 128 } 129 ocol++; 130 } 131 if (*cp == '\0' || !all) { 132 strlcpy(dp, cp, len); 133 return; 134 } 135 *dp++ = *cp; 136 len--; 137 ocol++; 138 dcol++; 139 } 140 cp++; 141 } 142 } 143