1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1987, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static char sccsid[] = "@(#)yacc.c 8.3 (Berkeley) 4/2/94"; 35 #endif 36 #endif 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <ctype.h> 42 #include <limits.h> 43 #include <stdio.h> 44 45 #include "ctags.h" 46 47 /* 48 * y_entries: 49 * find the yacc tags and put them in. 50 */ 51 void 52 y_entries(void) 53 { 54 int c; 55 char *sp; 56 bool in_rule; 57 char tok[MAXTOKEN]; 58 59 in_rule = NO; 60 61 while (GETC(!=, EOF)) 62 switch (c) { 63 case '\n': 64 SETLINE; 65 /* FALLTHROUGH */ 66 case ' ': 67 case '\f': 68 case '\r': 69 case '\t': 70 break; 71 case '{': 72 if (skip_key('}')) 73 in_rule = NO; 74 break; 75 case '\'': 76 case '"': 77 if (skip_key(c)) 78 in_rule = NO; 79 break; 80 case '%': 81 if (GETC(==, '%')) 82 return; 83 (void)ungetc(c, inf); 84 break; 85 case '/': 86 if (GETC(==, '*') || c == '/') 87 skip_comment(c); 88 else 89 (void)ungetc(c, inf); 90 break; 91 case '|': 92 case ';': 93 in_rule = NO; 94 break; 95 default: 96 if (in_rule || (!isalpha(c) && c != '.' && c != '_')) 97 break; 98 sp = tok; 99 *sp++ = c; 100 while (GETC(!=, EOF) && (intoken(c) || c == '.')) 101 *sp++ = c; 102 *sp = EOS; 103 get_line(); /* may change before ':' */ 104 while (iswhite(c)) { 105 if (c == '\n') 106 SETLINE; 107 if (GETC(==, EOF)) 108 return; 109 } 110 if (c == ':') { 111 pfnote(tok, lineno); 112 in_rule = YES; 113 } 114 else 115 (void)ungetc(c, inf); 116 } 117 } 118 119 /* 120 * toss_yysec -- 121 * throw away lines up to the next "\n%%\n" 122 */ 123 void 124 toss_yysec(void) 125 { 126 int c; /* read character */ 127 int state; 128 129 /* 130 * state == 0 : waiting 131 * state == 1 : received a newline 132 * state == 2 : received first % 133 * state == 3 : received second % 134 */ 135 lineftell = ftell(inf); 136 for (state = 0; GETC(!=, EOF);) 137 switch (c) { 138 case '\n': 139 ++lineno; 140 lineftell = ftell(inf); 141 if (state == 3) /* done! */ 142 return; 143 state = 1; /* start over */ 144 break; 145 case '%': 146 if (state) /* if 1 or 2 */ 147 ++state; /* goto 3 */ 148 break; 149 default: 150 state = 0; /* reset */ 151 break; 152 } 153 } 154