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/* $OpenBSD: unexpand.c,v 1.12 2015/11/11 02:52:46 deraadt Exp $ */ |
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/* $NetBSD: unexpand.c,v 1.5 1994/12/24 17:08:05 cgd Exp $ */ |
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/*- |
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* Copyright (c) 1980, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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/* |
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* unexpand - put tabs into a file replacing blanks |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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char genbuf[BUFSIZ]; |
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char linebuf[BUFSIZ]; |
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int all; |
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void tabify(char); |
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int |
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main(int argc, char *argv[]) |
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{ |
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char *cp; |
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if (pledge("stdio rpath wpath cpath", NULL) == -1) { |
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perror("pledge"); |
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exit(1); |
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} |
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argc--, argv++; |
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if (argc > 0 && argv[0][0] == '-') { |
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if (strcmp(argv[0], "-a") != 0) { |
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fprintf(stderr, "usage: unexpand [-a] [file ...]\n"); |
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exit(1); |
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} |
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all++; |
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argc--, argv++; |
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} |
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do { |
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if (argc > 0) { |
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if (freopen(argv[0], "r", stdin) == NULL) { |
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perror(argv[0]); |
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exit(1); |
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} |
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argc--, argv++; |
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} |
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while (fgets(genbuf, BUFSIZ, stdin) != NULL) { |
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for (cp = linebuf; *cp; cp++) |
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continue; |
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if (cp > linebuf) |
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cp[-1] = 0; |
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tabify(all); |
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printf("%s", linebuf); |
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} |
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} while (argc > 0); |
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exit(0); |
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} |
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void |
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tabify(char c) |
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{ |
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char *cp, *dp; |
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int dcol; |
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int ocol; |
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size_t len; |
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ocol = 0; |
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dcol = 0; |
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cp = genbuf; |
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dp = linebuf; |
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len = sizeof linebuf; |
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for (;;) { |
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switch (*cp) { |
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case ' ': |
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dcol++; |
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break; |
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case '\t': |
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dcol += 8; |
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dcol &= ~07; |
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break; |
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default: |
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while (((ocol + 8) &~ 07) <= dcol) { |
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if (ocol + 1 == dcol) |
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break; |
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if (len > 1) { |
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*dp++ = '\t'; |
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len--; |
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} |
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ocol += 8; |
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ocol &= ~07; |
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} |
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while (ocol < dcol) { |
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if (len > 1) { |
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*dp++ = ' '; |
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len--; |
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} |
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ocol++; |
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} |
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if (*cp == 0 || c == 0) { |
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strlcpy(dp, cp, len); |
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return; |
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} |
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*dp++ = *cp; |
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len--; |
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ocol++; |
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dcol++; |
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} |
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cp++; |
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} |
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} |