ac59a0c5cd
multiple times when performing nested variable expansion, and preserve some quoting information in order to avoid removing apparently empty expansion result.
404 lines
10 KiB
C
404 lines
10 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1991, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)mksyntax.c 8.2 (Berkeley) 5/4/95";
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#endif
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static const char rcsid[] =
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"$Id: mksyntax.c,v 1.11 1998/05/18 06:44:03 charnier Exp $";
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#endif /* not lint */
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/*
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* This program creates syntax.h and syntax.c.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "parser.h"
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struct synclass {
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char *name;
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char *comment;
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};
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/* Syntax classes */
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struct synclass synclass[] = {
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{ "CWORD", "character is nothing special" },
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{ "CNL", "newline character" },
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{ "CBACK", "a backslash character" },
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{ "CSQUOTE", "single quote" },
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{ "CDQUOTE", "double quote" },
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{ "CENDQUOTE", "a terminating quote" },
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{ "CBQUOTE", "backwards single quote" },
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{ "CVAR", "a dollar sign" },
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{ "CENDVAR", "a '}' character" },
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{ "CLP", "a left paren in arithmetic" },
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{ "CRP", "a right paren in arithmetic" },
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{ "CEOF", "end of file" },
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{ "CCTL", "like CWORD, except it must be escaped" },
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{ "CSPCL", "these terminate a word" },
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{ NULL, NULL }
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};
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/*
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* Syntax classes for is_ functions. Warning: if you add new classes
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* you may have to change the definition of the is_in_name macro.
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*/
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struct synclass is_entry[] = {
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{ "ISDIGIT", "a digit" },
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{ "ISUPPER", "an upper case letter" },
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{ "ISLOWER", "a lower case letter" },
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{ "ISUNDER", "an underscore" },
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{ "ISSPECL", "the name of a special parameter" },
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{ NULL, NULL }
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};
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static char writer[] = "\
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/*\n\
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* This file was generated by the mksyntax program.\n\
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*/\n\
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\n";
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static FILE *cfile;
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static FILE *hfile;
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static char *syntax[513];
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static int base;
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static int size; /* number of values which a char variable can have */
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static int nbits; /* number of bits in a character */
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static int digit_contig;/* true if digits are contiguous */
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static void filltable __P((char *));
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static void init __P((void));
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static void add __P((char *, char *));
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static void print __P((char *));
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static void output_type_macros __P((void));
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static void digit_convert __P((void));
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int
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main(argc, argv)
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int argc __unused;
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char **argv __unused;
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{
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char c;
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char d;
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int sign;
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int i;
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char buf[80];
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int pos;
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static char digit[] = "0123456789";
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/* Create output files */
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if ((cfile = fopen("syntax.c", "w")) == NULL) {
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perror("syntax.c");
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exit(2);
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}
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if ((hfile = fopen("syntax.h", "w")) == NULL) {
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perror("syntax.h");
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exit(2);
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}
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fputs(writer, hfile);
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fputs(writer, cfile);
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/* Determine the characteristics of chars. */
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c = -1;
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if (c < 0)
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sign = 1;
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else
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sign = 0;
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for (nbits = 1 ; ; nbits++) {
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d = (1 << nbits) - 1;
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if (d == c)
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break;
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}
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#if 0
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printf("%s %d bit chars\n", sign? "signed" : "unsigned", nbits);
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#endif
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if (nbits > 9) {
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fputs("Characters can't have more than 9 bits\n", stderr);
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exit(2);
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}
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size = (1 << nbits) + 1;
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base = 1;
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if (sign)
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base += 1 << (nbits - 1);
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digit_contig = 1;
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for (i = 0 ; i < 10 ; i++) {
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if (digit[i] != '0' + i)
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digit_contig = 0;
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}
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fputs("#include <sys/cdefs.h>\n", hfile);
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fputs("#include <ctype.h>\n", hfile);
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/* Generate the #define statements in the header file */
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fputs("/* Syntax classes */\n", hfile);
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for (i = 0 ; synclass[i].name ; i++) {
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sprintf(buf, "#define %s %d", synclass[i].name, i);
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fputs(buf, hfile);
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for (pos = strlen(buf) ; pos < 32 ; pos = (pos + 8) & ~07)
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putc('\t', hfile);
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fprintf(hfile, "/* %s */\n", synclass[i].comment);
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}
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putc('\n', hfile);
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fputs("/* Syntax classes for is_ functions */\n", hfile);
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for (i = 0 ; is_entry[i].name ; i++) {
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sprintf(buf, "#define %s %#o", is_entry[i].name, 1 << i);
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fputs(buf, hfile);
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for (pos = strlen(buf) ; pos < 32 ; pos = (pos + 8) & ~07)
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putc('\t', hfile);
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fprintf(hfile, "/* %s */\n", is_entry[i].comment);
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}
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putc('\n', hfile);
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fprintf(hfile, "#define SYNBASE %d\n", base);
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fprintf(hfile, "#define PEOF %d\n\n", -base);
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putc('\n', hfile);
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fputs("#define BASESYNTAX (basesyntax + SYNBASE)\n", hfile);
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fputs("#define DQSYNTAX (dqsyntax + SYNBASE)\n", hfile);
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fputs("#define SQSYNTAX (sqsyntax + SYNBASE)\n", hfile);
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fputs("#define ARISYNTAX (arisyntax + SYNBASE)\n", hfile);
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putc('\n', hfile);
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output_type_macros(); /* is_digit, etc. */
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putc('\n', hfile);
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/* Generate the syntax tables. */
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fputs("#include \"shell.h\"\n", cfile);
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fputs("#include \"syntax.h\"\n\n", cfile);
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init();
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fputs("/* syntax table used when not in quotes */\n", cfile);
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add("\n", "CNL");
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add("\\", "CBACK");
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add("'", "CSQUOTE");
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add("\"", "CDQUOTE");
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add("`", "CBQUOTE");
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add("$", "CVAR");
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add("}", "CENDVAR");
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add("<>();&| \t", "CSPCL");
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print("basesyntax");
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init();
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fputs("\n/* syntax table used when in double quotes */\n", cfile);
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add("\n", "CNL");
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add("\\", "CBACK");
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add("\"", "CENDQUOTE");
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add("`", "CBQUOTE");
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add("$", "CVAR");
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add("}", "CENDVAR");
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/* ':/' for tilde expansion, '-' for [a\-x] pattern ranges */
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add("!*?[=~:/-", "CCTL");
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print("dqsyntax");
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init();
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fputs("\n/* syntax table used when in single quotes */\n", cfile);
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add("\n", "CNL");
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add("'", "CENDQUOTE");
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/* ':/' for tilde expansion, '-' for [a\-x] pattern ranges */
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add("!*?[=~:/-", "CCTL");
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print("sqsyntax");
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init();
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fputs("\n/* syntax table used when in arithmetic */\n", cfile);
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add("\n", "CNL");
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add("\\", "CBACK");
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add("`", "CBQUOTE");
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add("'", "CSQUOTE");
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add("\"", "CDQUOTE");
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add("$", "CVAR");
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add("}", "CENDVAR");
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add("(", "CLP");
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add(")", "CRP");
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print("arisyntax");
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filltable("0");
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fputs("\n/* character classification table */\n", cfile);
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add("0123456789", "ISDIGIT");
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add("abcdefghijklmnopqrstucvwxyz", "ISLOWER");
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add("ABCDEFGHIJKLMNOPQRSTUCVWXYZ", "ISUPPER");
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add("_", "ISUNDER");
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add("#?$!-*@", "ISSPECL");
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print("is_type");
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if (! digit_contig)
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digit_convert();
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exit(0);
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}
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/*
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* Clear the syntax table.
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*/
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static void
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filltable(dftval)
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char *dftval;
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{
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int i;
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for (i = 0 ; i < size ; i++)
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syntax[i] = dftval;
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}
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/*
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* Initialize the syntax table with default values.
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*/
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static void
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init()
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{
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filltable("CWORD");
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syntax[0] = "CEOF";
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syntax[base + CTLESC] = "CCTL";
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syntax[base + CTLVAR] = "CCTL";
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syntax[base + CTLENDVAR] = "CCTL";
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syntax[base + CTLBACKQ] = "CCTL";
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syntax[base + CTLBACKQ + CTLQUOTE] = "CCTL";
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syntax[base + CTLARI] = "CCTL";
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syntax[base + CTLENDARI] = "CCTL";
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syntax[base + CTLQUOTEMARK] = "CCTL";
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}
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/*
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* Add entries to the syntax table.
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*/
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static void
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add(p, type)
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char *p, *type;
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{
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while (*p)
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syntax[*p++ + base] = type;
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}
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/*
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* Output the syntax table.
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*/
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static void
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print(name)
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char *name;
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{
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int i;
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int col;
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fprintf(hfile, "extern const char %s[];\n", name);
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fprintf(cfile, "const char %s[%d] = {\n", name, size);
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col = 0;
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for (i = 0 ; i < size ; i++) {
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if (i == 0) {
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fputs(" ", cfile);
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} else if ((i & 03) == 0) {
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fputs(",\n ", cfile);
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col = 0;
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} else {
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putc(',', cfile);
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while (++col < 9 * (i & 03))
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putc(' ', cfile);
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}
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fputs(syntax[i], cfile);
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col += strlen(syntax[i]);
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}
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fputs("\n};\n", cfile);
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}
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/*
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* Output character classification macros (e.g. is_digit). If digits are
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* contiguous, we can test for them quickly.
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*/
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static char *macro[] = {
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"#define is_digit(c)\t((is_type+SYNBASE)[c] & ISDIGIT)",
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"#define is_alpha(c)\t((c) != PEOF && ((c) < CTLESC || (c) > CTLENDARI) && isalpha((unsigned char) (c)))",
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"#define is_name(c)\t((c) != PEOF && ((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalpha((unsigned char) (c))))",
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"#define is_in_name(c)\t((c) != PEOF && ((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalnum((unsigned char) (c))))",
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"#define is_special(c)\t((is_type+SYNBASE)[c] & (ISSPECL|ISDIGIT))",
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NULL
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};
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static void
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output_type_macros()
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{
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char **pp;
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if (digit_contig)
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macro[0] = "#define is_digit(c)\t((unsigned)((c) - '0') <= 9)";
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for (pp = macro ; *pp ; pp++)
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fprintf(hfile, "%s\n", *pp);
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if (digit_contig)
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fputs("#define digit_val(c)\t((c) - '0')\n", hfile);
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else
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fputs("#define digit_val(c)\t(digit_value[c])\n", hfile);
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}
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/*
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* Output digit conversion table (if digits are not contiguous).
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*/
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static void
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digit_convert()
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{
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int maxdigit;
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static char digit[] = "0123456789";
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char *p;
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int i;
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maxdigit = 0;
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for (p = digit ; *p ; p++)
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if (*p > maxdigit)
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maxdigit = *p;
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fputs("extern const char digit_value[];\n", hfile);
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fputs("\n\nconst char digit_value[] = {\n", cfile);
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for (i = 0 ; i <= maxdigit ; i++) {
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for (p = digit ; *p && *p != i ; p++);
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if (*p == '\0')
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p = digit;
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fprintf(cfile, " %d,\n", p - digit);
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}
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fputs("};\n", cfile);
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}
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