Import /usr/src/bin/sh from FreeBSD 12.0-RELEASE

1 files changed, 332 insertions, 0 deletions

diff --git a/bin/cash/mksyntax.c b/bin/cash/mksyntax.c
new file mode 100644
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--- /dev/null
+++ b/bin/cash/mksyntax.c
@@ -0,0 +1,332 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if 0
+#ifndef lint
+static char const copyright[] =
+"@(#) Copyright (c) 1991, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)mksyntax.c	8.2 (Berkeley) 5/4/95";
+#endif /* not lint */
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: releng/12.0/bin/sh/mksyntax.c 334008 2018-05-21 21:52:48Z jilles $");
+
+/*
+ * This program creates syntax.h and syntax.c.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "parser.h"
+
+
+struct synclass {
+	const char *name;
+	const char *comment;
+};
+
+/* Syntax classes */
+static const struct synclass synclass[] = {
+	{ "CWORD",	"character is nothing special" },
+	{ "CNL",	"newline character" },
+	{ "CQNL",	"newline character in quotes" },
+	{ "CBACK",	"a backslash character" },
+	{ "CSBACK",	"a backslash character in single quotes" },
+	{ "CSQUOTE",	"single quote" },
+	{ "CDQUOTE",	"double quote" },
+	{ "CENDQUOTE",	"a terminating quote" },
+	{ "CBQUOTE",	"backwards single quote" },
+	{ "CVAR",	"a dollar sign" },
+	{ "CENDVAR",	"a '}' character" },
+	{ "CLP",	"a left paren in arithmetic" },
+	{ "CRP",	"a right paren in arithmetic" },
+	{ "CEOF",	"end of file" },
+	{ "CCTL",	"like CWORD, except it must be escaped" },
+	{ "CSPCL",	"these terminate a word" },
+	{ "CIGN",       "character should be ignored" },
+	{ NULL,		NULL }
+};
+
+
+/*
+ * Syntax classes for is_ functions.  Warning:  if you add new classes
+ * you may have to change the definition of the is_in_name macro.
+ */
+static const struct synclass is_entry[] = {
+	{ "ISDIGIT",	"a digit" },
+	{ "ISUPPER",	"an upper case letter" },
+	{ "ISLOWER",	"a lower case letter" },
+	{ "ISUNDER",	"an underscore" },
+	{ "ISSPECL",	"the name of a special parameter" },
+	{ NULL, 	NULL }
+};
+
+static const char writer[] = "\
+/*\n\
+ * This file was generated by the mksyntax program.\n\
+ */\n\
+\n";
+
+
+static FILE *cfile;
+static FILE *hfile;
+
+static void add_default(void);
+static void finish(void);
+static void init(const char *);
+static void add(const char *, const char *);
+static void output_type_macros(void);
+
+int
+main(int argc __unused, char **argv __unused)
+{
+	int i;
+	char buf[80];
+	int pos;
+
+	/* Create output files */
+	if ((cfile = fopen("syntax.c", "w")) == NULL) {
+		perror("syntax.c");
+		exit(2);
+	}
+	if ((hfile = fopen("syntax.h", "w")) == NULL) {
+		perror("syntax.h");
+		exit(2);
+	}
+	fputs(writer, hfile);
+	fputs(writer, cfile);
+
+	fputs("#include <sys/cdefs.h>\n", hfile);
+	fputs("#include <limits.h>\n\n", hfile);
+
+	/* Generate the #define statements in the header file */
+	fputs("/* Syntax classes */\n", hfile);
+	for (i = 0 ; synclass[i].name ; i++) {
+		sprintf(buf, "#define %s %d", synclass[i].name, i);
+		fputs(buf, hfile);
+		for (pos = strlen(buf) ; pos < 32 ; pos = (pos + 8) & ~07)
+			putc('\t', hfile);
+		fprintf(hfile, "/* %s */\n", synclass[i].comment);
+	}
+	putc('\n', hfile);
+	fputs("/* Syntax classes for is_ functions */\n", hfile);
+	for (i = 0 ; is_entry[i].name ; i++) {
+		sprintf(buf, "#define %s %#o", is_entry[i].name, 1 << i);
+		fputs(buf, hfile);
+		for (pos = strlen(buf) ; pos < 32 ; pos = (pos + 8) & ~07)
+			putc('\t', hfile);
+		fprintf(hfile, "/* %s */\n", is_entry[i].comment);
+	}
+	putc('\n', hfile);
+	fputs("#define SYNBASE (1 - CHAR_MIN)\n", hfile);
+	fputs("#define PEOF -SYNBASE\n\n", hfile);
+	putc('\n', hfile);
+	fputs("#define BASESYNTAX (basesyntax + SYNBASE)\n", hfile);
+	fputs("#define DQSYNTAX (dqsyntax + SYNBASE)\n", hfile);
+	fputs("#define SQSYNTAX (sqsyntax + SYNBASE)\n", hfile);
+	fputs("#define ARISYNTAX (arisyntax + SYNBASE)\n", hfile);
+	putc('\n', hfile);
+	output_type_macros();		/* is_digit, etc. */
+	putc('\n', hfile);
+
+	/* Generate the syntax tables. */
+	fputs("#include \"parser.h\"\n", cfile);
+	fputs("#include \"shell.h\"\n", cfile);
+	fputs("#include \"syntax.h\"\n\n", cfile);
+
+	fputs("/* syntax table used when not in quotes */\n", cfile);
+	init("basesyntax");
+	add_default();
+	add("\n", "CNL");
+	add("\\", "CBACK");
+	add("'", "CSQUOTE");
+	add("\"", "CDQUOTE");
+	add("`", "CBQUOTE");
+	add("$", "CVAR");
+	add("}", "CENDVAR");
+	add("<>();&| \t", "CSPCL");
+	finish();
+
+	fputs("\n/* syntax table used when in double quotes */\n", cfile);
+	init("dqsyntax");
+	add_default();
+	add("\n", "CQNL");
+	add("\\", "CBACK");
+	add("\"", "CENDQUOTE");
+	add("`", "CBQUOTE");
+	add("$", "CVAR");
+	add("}", "CENDVAR");
+	/* ':/' for tilde expansion, '-^]' for [a\-x] pattern ranges */
+	add("!*?[]=~:/-^", "CCTL");
+	finish();
+
+	fputs("\n/* syntax table used when in single quotes */\n", cfile);
+	init("sqsyntax");
+	add_default();
+	add("\n", "CQNL");
+	add("\\", "CSBACK");
+	add("'", "CENDQUOTE");
+	/* ':/' for tilde expansion, '-^]' for [a\-x] pattern ranges */
+	add("!*?[]=~:/-^", "CCTL");
+	finish();
+
+	fputs("\n/* syntax table used when in arithmetic */\n", cfile);
+	init("arisyntax");
+	add_default();
+	add("\n", "CQNL");
+	add("\\", "CBACK");
+	add("`", "CBQUOTE");
+	add("\"", "CIGN");
+	add("$", "CVAR");
+	add("}", "CENDVAR");
+	add("(", "CLP");
+	add(")", "CRP");
+	finish();
+
+	fputs("\n/* character classification table */\n", cfile);
+	init("is_type");
+	add("0123456789", "ISDIGIT");
+	add("abcdefghijklmnopqrstuvwxyz", "ISLOWER");
+	add("ABCDEFGHIJKLMNOPQRSTUVWXYZ", "ISUPPER");
+	add("_", "ISUNDER");
+	add("#?$!-*@", "ISSPECL");
+	finish();
+
+	exit(0);
+}
+
+
+/*
+ * Output the header and declaration of a syntax table.
+ */
+
+static void
+init(const char *name)
+{
+	fprintf(hfile, "extern const char %s[];\n", name);
+	fprintf(cfile, "const char %s[SYNBASE + CHAR_MAX + 1] = {\n", name);
+}
+
+
+static void
+add_one(const char *key, const char *type)
+{
+	fprintf(cfile, "\t[SYNBASE + %s] = %s,\n", key, type);
+}
+
+
+/*
+ * Add default values to the syntax table.
+ */
+
+static void
+add_default(void)
+{
+	add_one("PEOF",                "CEOF");
+	add_one("CTLESC",              "CCTL");
+	add_one("CTLVAR",              "CCTL");
+	add_one("CTLENDVAR",           "CCTL");
+	add_one("CTLBACKQ",            "CCTL");
+	add_one("CTLBACKQ + CTLQUOTE", "CCTL");
+	add_one("CTLARI",              "CCTL");
+	add_one("CTLENDARI",           "CCTL");
+	add_one("CTLQUOTEMARK",        "CCTL");
+	add_one("CTLQUOTEEND",         "CCTL");
+}
+
+
+/*
+ * Output the footer of a syntax table.
+ */
+
+static void
+finish(void)
+{
+	fputs("};\n", cfile);
+}
+
+
+/*
+ * Add entries to the syntax table.
+ */
+
+static void
+add(const char *p, const char *type)
+{
+	for (; *p; ++p) {
+		char c = *p;
+		switch (c) {
+		case '\t': c = 't';  break;
+		case '\n': c = 'n';  break;
+		case '\'': c = '\''; break;
+		case '\\': c = '\\'; break;
+
+		default:
+			fprintf(cfile, "\t[SYNBASE + '%c'] = %s,\n", c, type);
+			continue;
+		}
+		fprintf(cfile, "\t[SYNBASE + '\\%c'] = %s,\n", c, type);
+	}
+}
+
+
+/*
+ * Output character classification macros (e.g. is_digit).  If digits are
+ * contiguous, we can test for them quickly.
+ */
+
+static const char *macro[] = {
+	"#define is_digit(c)\t((unsigned int)((c) - '0') <= 9)",
+	"#define is_eof(c)\t((c) == PEOF)",
+	"#define is_alpha(c)\t((is_type+SYNBASE)[(int)c] & (ISUPPER|ISLOWER))",
+	"#define is_name(c)\t((is_type+SYNBASE)[(int)c] & (ISUPPER|ISLOWER|ISUNDER))",
+	"#define is_in_name(c)\t((is_type+SYNBASE)[(int)c] & (ISUPPER|ISLOWER|ISUNDER|ISDIGIT))",
+	"#define is_special(c)\t((is_type+SYNBASE)[(int)c] & (ISSPECL|ISDIGIT))",
+	"#define digit_val(c)\t((c) - '0')",
+	NULL
+};
+
+static void
+output_type_macros(void)
+{
+	const char **pp;
+
+	for (pp = macro ; *pp ; pp++)
+		fprintf(hfile, "%s\n", *pp);
+}