1 /* $NetBSD: syntax.h,v 1.12 2019/02/27 04:10:56 kre Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #include <ctype.h> 37 38 /* Syntax classes */ 39 #define CWORD 0 /* character is nothing special */ 40 #define CNL 1 /* newline character */ 41 #define CBACK 2 /* a backslash character */ 42 #define CSQUOTE 3 /* single quote */ 43 #define CDQUOTE 4 /* double quote */ 44 #define CBQUOTE 5 /* backwards single quote */ 45 #define CVAR 6 /* a dollar sign */ 46 #define CENDVAR 7 /* a '}' character */ 47 #define CLP 8 /* a left paren in arithmetic */ 48 #define CRP 9 /* a right paren in arithmetic */ 49 #define CEOF 10 /* end of file */ 50 #define CSPCL 11 /* these terminate a word */ 51 #define CCTL 12 /* like CWORD, except it must be escaped */ 52 #define CSBACK 13 /* a backslash in a single quote syntax */ 53 #define CFAKE 14 /* a delimiter that does not exist */ 54 /* 55 * note CSBACK == (CCTL|1) 56 * the code does not rely upon that, but keeping it allows a 57 * smart enough compiler to optimise some tests 58 */ 59 60 /* Syntax classes for is_ functions */ 61 #define ISDIGIT 01 /* a digit */ 62 #define ISUPPER 02 /* an upper case letter */ 63 #define ISLOWER 04 /* a lower case letter */ 64 #define ISUNDER 010 /* an underscore */ 65 #define ISSPECL 020 /* the name of a special parameter */ 66 #define ISSPACE 040 /* a white space character */ 67 68 #define PEOF (CHAR_MIN - 1) 69 #define PFAKE (CHAR_MIN - 2) 70 #define SYNBASE (-PFAKE) 71 72 73 #define BASESYNTAX (basesyntax + SYNBASE) 74 #define DQSYNTAX (dqsyntax + SYNBASE) 75 #define SQSYNTAX (sqsyntax + SYNBASE) 76 #define ARISYNTAX (arisyntax + SYNBASE) 77 78 /* These defines assume that the digits are contiguous (which is guaranteed) */ 79 #define is_digit(c) ((unsigned)((c) - '0') <= 9) 80 #define sh_ctype(c) (is_type+SYNBASE)[(int)(c)] 81 #define is_upper(c) (sh_ctype(c) & ISUPPER) 82 #define is_lower(c) (sh_ctype(c) & ISLOWER) 83 #define is_alpha(c) (sh_ctype(c) & (ISUPPER|ISLOWER)) 84 #define is_name(c) (sh_ctype(c) & (ISUPPER|ISLOWER|ISUNDER)) 85 #define is_in_name(c) (sh_ctype(c) & (ISUPPER|ISLOWER|ISUNDER|ISDIGIT)) 86 #define is_special(c) (sh_ctype(c) & (ISSPECL|ISDIGIT)) 87 #define is_space(c) (sh_ctype(c) & ISSPACE) 88 #define digit_val(c) ((c) - '0') 89 90 /* true if the arg char needs CTLESC to protect it */ 91 #define NEEDESC(c) (SQSYNTAX[(int)(c)] == CCTL || \ 92 SQSYNTAX[(int)(c)] == CSBACK) 93 94 #define ISCTL(c) ((c) >= CTL_FIRST && (c) <= CTL_LAST) 95 #if 0 /* alternative form (generally slower) */ 96 #define ICCTL(c) (BASESYNTAX[(int)(c)] == CCTL) 97 #endif 98 99 extern const char basesyntax[]; 100 extern const char dqsyntax[]; 101 extern const char sqsyntax[]; 102 extern const char arisyntax[]; 103 extern const char is_type[]; 104