1 /* 2 * Copyright (c) 1987, 1993, 1994 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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)yacc.c 8.3 (Berkeley) 4/2/94 30 * $FreeBSD: head/usr.bin/ctags/yacc.c 299355 2016-05-10 11:11:23Z bapt $ 31 */ 32 33 #include <ctype.h> 34 #include <limits.h> 35 #include <stdio.h> 36 37 #include "ctags.h" 38 39 /* 40 * y_entries: 41 * find the yacc tags and put them in. 42 */ 43 void 44 y_entries(void) 45 { 46 int c; 47 char *sp; 48 bool in_rule; 49 char tok[MAXTOKEN]; 50 51 in_rule = NO; 52 53 while (GETC(!=, EOF)) 54 switch (c) { 55 case '\n': 56 SETLINE; 57 /* FALLTHROUGH */ 58 case ' ': 59 case '\f': 60 case '\r': 61 case '\t': 62 break; 63 case '{': 64 if (skip_key('}')) 65 in_rule = NO; 66 break; 67 case '\'': 68 case '"': 69 if (skip_key(c)) 70 in_rule = NO; 71 break; 72 case '%': 73 if (GETC(==, '%')) 74 return; 75 ungetc(c, inf); 76 break; 77 case '/': 78 if (GETC(==, '*') || c == '/') 79 skip_comment(c); 80 else 81 ungetc(c, inf); 82 break; 83 case '|': 84 case ';': 85 in_rule = NO; 86 break; 87 default: 88 if (in_rule || (!isalpha(c) && c != '.' && c != '_')) 89 break; 90 sp = tok; 91 *sp++ = c; 92 while (GETC(!=, EOF) && (intoken(c) || c == '.')) 93 *sp++ = c; 94 *sp = EOS; 95 get_line(); /* may change before ':' */ 96 while (iswhite(c)) { 97 if (c == '\n') 98 SETLINE; 99 if (GETC(==, EOF)) 100 return; 101 } 102 if (c == ':') { 103 pfnote(tok, lineno); 104 in_rule = YES; 105 } 106 else 107 ungetc(c, inf); 108 } 109 } 110 111 /* 112 * toss_yysec -- 113 * throw away lines up to the next "\n%%\n" 114 */ 115 void 116 toss_yysec(void) 117 { 118 int c; /* read character */ 119 int state; 120 121 /* 122 * state == 0 : waiting 123 * state == 1 : received a newline 124 * state == 2 : received first % 125 * state == 3 : received second % 126 */ 127 lineftell = ftell(inf); 128 for (state = 0; GETC(!=, EOF);) 129 switch (c) { 130 case '\n': 131 ++lineno; 132 lineftell = ftell(inf); 133 if (state == 3) /* done! */ 134 return; 135 state = 1; /* start over */ 136 break; 137 case '%': 138 if (state) /* if 1 or 2 */ 139 ++state; /* goto 3 */ 140 break; 141 default: 142 state = 0; /* reset */ 143 break; 144 } 145 } 146