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/* $OpenBSD: yacc.c,v 1.9 2012/03/04 04:05:15 fgsch Exp $ */ |
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/* $NetBSD: yacc.c,v 1.3 1995/03/26 20:14:12 glass Exp $ */ |
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/* |
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* Copyright (c) 1987, 1993, 1994 |
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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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#include <ctype.h> |
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#include <limits.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include "ctags.h" |
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/* |
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* y_entries: |
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* find the yacc tags and put them in. |
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*/ |
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void |
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y_entries(void) |
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{ |
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int c; |
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char *sp; |
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bool in_rule; |
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char tok[MAXTOKEN]; |
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in_rule = NO; |
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while (GETC(!=, EOF)) |
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switch (c) { |
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case '\n': |
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SETLINE; |
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/* FALLTHROUGH */ |
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case ' ': |
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case '\f': |
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case '\r': |
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case '\t': |
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break; |
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case '{': |
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if (skip_key('}')) |
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in_rule = NO; |
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break; |
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case '\'': |
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case '"': |
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if (skip_key(c)) |
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in_rule = NO; |
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break; |
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case '%': |
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if (GETC(==, '%')) |
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return; |
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(void)ungetc(c, inf); |
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break; |
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case '/': |
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if (GETC(==, '*')) |
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skip_comment('*'); |
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else |
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(void)ungetc(c, inf); |
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break; |
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case '|': |
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case ';': |
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in_rule = NO; |
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break; |
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default: |
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if (in_rule || (!isalpha(c) && c != '.' && c != '_')) |
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break; |
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sp = tok; |
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*sp++ = c; |
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while (GETC(!=, EOF) && (intoken(c) || c == '.')) |
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*sp++ = c; |
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*sp = EOS; |
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get_line(); /* may change before ':' */ |
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while (iswhite(c)) { |
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if (c == '\n') |
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SETLINE; |
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if (GETC(==, EOF)) |
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return; |
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} |
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if (c == ':') { |
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pfnote(tok, lineno); |
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in_rule = YES; |
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} |
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else |
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(void)ungetc(c, inf); |
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} |
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} |
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/* |
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* toss_yysec -- |
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* throw away lines up to the next "\n%%\n" |
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*/ |
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void |
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toss_yysec(void) |
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{ |
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int c; /* read character */ |
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int state; |
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/* |
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* state == 0 : waiting |
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* state == 1 : received a newline |
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* state == 2 : received first % |
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* state == 3 : received second % |
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*/ |
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lineftell = ftell(inf); |
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for (state = 0; GETC(!=, EOF);) |
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switch (c) { |
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case '\n': |
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++lineno; |
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lineftell = ftell(inf); |
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if (state == 3) /* done! */ |
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return; |
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state = 1; /* start over */ |
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break; |
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case '%': |
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if (state) /* if 1 or 2 */ |
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++state; /* goto 3 */ |
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break; |
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default: |
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state = 0; /* reset */ |
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break; |
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} |
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} |