1 /* $NetBSD: syntax.h,v 1.13 2024/06/15 05:02:24 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 #include <limits.h> 38 39 /* Syntax classes */ 40 #define CWORD 0 /* character is nothing special */ 41 #define CNL 1 /* newline character */ 42 #define CBACK 2 /* a backslash character */ 43 #define CSQUOTE 3 /* single quote */ 44 #define CDQUOTE 4 /* double quote */ 45 #define CBQUOTE 5 /* backwards single quote */ 46 #define CVAR 6 /* a dollar sign */ 47 #define CENDVAR 7 /* a '}' character */ 48 #define CLP 8 /* a left paren in arithmetic */ 49 #define CRP 9 /* a right paren in arithmetic */ 50 #define CEOF 10 /* end of file */ 51 #define CSPCL 11 /* these terminate a word */ 52 #define CCTL 12 /* like CWORD, except it must be escaped */ 53 #define CSBACK 13 /* a backslash in a single quote syntax */ 54 #define CFAKE 14 /* a delimiter that does not exist */ 55 /* 56 * note CSBACK == (CCTL|1) 57 * the code does not rely upon that, but keeping it allows a 58 * smart enough compiler to optimise some tests 59 */ 60 61 /* Syntax classes for is_ functions */ 62 #define ISDIGIT 01 /* a digit */ 63 #define ISUPPER 02 /* an upper case letter */ 64 #define ISLOWER 04 /* a lower case letter */ 65 #define ISUNDER 010 /* an underscore */ 66 #define ISSPECL 020 /* the name of a special parameter */ 67 #define ISSPACE 040 /* a white space character */ 68 69 #define PEOF (CHAR_MIN - 1) 70 #define PFAKE (CHAR_MIN - 2) 71 #define SYNBASE (-PFAKE) 72 73 74 #define BASESYNTAX (basesyntax + SYNBASE) 75 #define DQSYNTAX (dqsyntax + SYNBASE) 76 #define SQSYNTAX (sqsyntax + SYNBASE) 77 #define ARISYNTAX (arisyntax + SYNBASE) 78 79 /* These defines assume that the digits are contiguous (which is guaranteed) */ 80 #define is_digit(c) ((unsigned)((c) - '0') <= 9) 81 #define sh_ctype(c) (is_type+SYNBASE)[(int)(c)] 82 #define is_upper(c) (sh_ctype(c) & ISUPPER) 83 #define is_lower(c) (sh_ctype(c) & ISLOWER) 84 #define is_alpha(c) (sh_ctype(c) & (ISUPPER|ISLOWER)) 85 #define is_name(c) (sh_ctype(c) & (ISUPPER|ISLOWER|ISUNDER)) 86 #define is_in_name(c) (sh_ctype(c) & (ISUPPER|ISLOWER|ISUNDER|ISDIGIT)) 87 #define is_special(c) (sh_ctype(c) & (ISSPECL|ISDIGIT)) 88 #define is_space(c) (sh_ctype(c) & ISSPACE) 89 #define digit_val(c) ((c) - '0') 90 91 /* true if the arg char needs CTLESC to protect it */ 92 #define NEEDESC(c) (SQSYNTAX[(int)(c)] == CCTL || \ 93 SQSYNTAX[(int)(c)] == CSBACK) 94 95 #define ISCTL(c) ((c) >= CTL_FIRST && (c) <= CTL_LAST) 96 #if 0 /* alternative form (generally slower) */ 97 #define ISCTL(c) (BASESYNTAX[(int)(c)] == CCTL) 98 #endif 99 100 extern const char basesyntax[]; 101 extern const char dqsyntax[]; 102 extern const char sqsyntax[]; 103 extern const char arisyntax[]; 104 extern const char is_type[]; 105