1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 /*
36 * This program creates syntax.h and syntax.c.
37 */
38
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include "parser.h"
43
44
45 struct synclass {
46 const char *name;
47 const char *comment;
48 };
49
50 /* Syntax classes */
51 static const struct synclass synclass[] = {
52 { "CWORD", "character is nothing special" },
53 { "CNL", "newline character" },
54 { "CQNL", "newline character in quotes" },
55 { "CBACK", "a backslash character" },
56 { "CSBACK", "a backslash character in single quotes" },
57 { "CSQUOTE", "single quote" },
58 { "CDQUOTE", "double quote" },
59 { "CENDQUOTE", "a terminating quote" },
60 { "CBQUOTE", "backwards single quote" },
61 { "CVAR", "a dollar sign" },
62 { "CENDVAR", "a '}' character" },
63 { "CLP", "a left paren in arithmetic" },
64 { "CRP", "a right paren in arithmetic" },
65 { "CEOF", "end of file" },
66 { "CCTL", "like CWORD, except it must be escaped" },
67 { "CSPCL", "these terminate a word" },
68 { "CIGN", "character should be ignored" },
69 { NULL, NULL }
70 };
71
72
73 /*
74 * Syntax classes for is_ functions. Warning: if you add new classes
75 * you may have to change the definition of the is_in_name macro.
76 */
77 static const struct synclass is_entry[] = {
78 { "ISDIGIT", "a digit" },
79 { "ISUPPER", "an upper case letter" },
80 { "ISLOWER", "a lower case letter" },
81 { "ISUNDER", "an underscore" },
82 { "ISSPECL", "the name of a special parameter" },
83 { NULL, NULL }
84 };
85
86 static const char writer[] = "\
87 /*\n\
88 * This file was generated by the mksyntax program.\n\
89 */\n\
90 \n";
91
92
93 static FILE *cfile;
94 static FILE *hfile;
95
96 static void add_default(void);
97 static void finish(void);
98 static void init(const char *);
99 static void add(const char *, const char *);
100 static void output_type_macros(void);
101
102 int
main(int argc __unused,char ** argv __unused)103 main(int argc __unused, char **argv __unused)
104 {
105 int i;
106 char buf[80];
107 int pos;
108
109 /* Create output files */
110 if ((cfile = fopen("syntax.c", "w")) == NULL) {
111 perror("syntax.c");
112 exit(2);
113 }
114 if ((hfile = fopen("syntax.h", "w")) == NULL) {
115 perror("syntax.h");
116 exit(2);
117 }
118 fputs(writer, hfile);
119 fputs(writer, cfile);
120
121 fputs("#include <sys/cdefs.h>\n", hfile);
122 fputs("#include <limits.h>\n\n", hfile);
123
124 /* Generate the #define statements in the header file */
125 fputs("/* Syntax classes */\n", hfile);
126 for (i = 0 ; synclass[i].name ; i++) {
127 sprintf(buf, "#define %s %d", synclass[i].name, i);
128 fputs(buf, hfile);
129 for (pos = strlen(buf) ; pos < 32 ; pos = (pos + 8) & ~07)
130 putc('\t', hfile);
131 fprintf(hfile, "/* %s */\n", synclass[i].comment);
132 }
133 putc('\n', hfile);
134 fputs("/* Syntax classes for is_ functions */\n", hfile);
135 for (i = 0 ; is_entry[i].name ; i++) {
136 sprintf(buf, "#define %s %#o", is_entry[i].name, 1 << i);
137 fputs(buf, hfile);
138 for (pos = strlen(buf) ; pos < 32 ; pos = (pos + 8) & ~07)
139 putc('\t', hfile);
140 fprintf(hfile, "/* %s */\n", is_entry[i].comment);
141 }
142 putc('\n', hfile);
143 fputs("#define SYNBASE (1 - CHAR_MIN)\n", hfile);
144 fputs("#define PEOF -SYNBASE\n\n", hfile);
145 putc('\n', hfile);
146 fputs("#define BASESYNTAX (basesyntax + SYNBASE)\n", hfile);
147 fputs("#define DQSYNTAX (dqsyntax + SYNBASE)\n", hfile);
148 fputs("#define SQSYNTAX (sqsyntax + SYNBASE)\n", hfile);
149 fputs("#define ARISYNTAX (arisyntax + SYNBASE)\n", hfile);
150 putc('\n', hfile);
151 output_type_macros(); /* is_digit, etc. */
152 putc('\n', hfile);
153
154 /* Generate the syntax tables. */
155 fputs("#include \"parser.h\"\n", cfile);
156 fputs("#include \"shell.h\"\n", cfile);
157 fputs("#include \"syntax.h\"\n\n", cfile);
158
159 fputs("/* syntax table used when not in quotes */\n", cfile);
160 init("basesyntax");
161 add_default();
162 add("\n", "CNL");
163 add("\\", "CBACK");
164 add("'", "CSQUOTE");
165 add("\"", "CDQUOTE");
166 add("`", "CBQUOTE");
167 add("$", "CVAR");
168 add("}", "CENDVAR");
169 add("<>();&| \t", "CSPCL");
170 finish();
171
172 fputs("\n/* syntax table used when in double quotes */\n", cfile);
173 init("dqsyntax");
174 add_default();
175 add("\n", "CQNL");
176 add("\\", "CBACK");
177 add("\"", "CENDQUOTE");
178 add("`", "CBQUOTE");
179 add("$", "CVAR");
180 add("}", "CENDVAR");
181 /* ':/' for tilde expansion, '-^]' for [a\-x] pattern ranges */
182 add("!*?[]=~:/-^", "CCTL");
183 finish();
184
185 fputs("\n/* syntax table used when in single quotes */\n", cfile);
186 init("sqsyntax");
187 add_default();
188 add("\n", "CQNL");
189 add("\\", "CSBACK");
190 add("'", "CENDQUOTE");
191 /* ':/' for tilde expansion, '-^]' for [a\-x] pattern ranges */
192 add("!*?[]=~:/-^", "CCTL");
193 finish();
194
195 fputs("\n/* syntax table used when in arithmetic */\n", cfile);
196 init("arisyntax");
197 add_default();
198 add("\n", "CQNL");
199 add("\\", "CBACK");
200 add("`", "CBQUOTE");
201 add("\"", "CIGN");
202 add("$", "CVAR");
203 add("}", "CENDVAR");
204 add("(", "CLP");
205 add(")", "CRP");
206 finish();
207
208 fputs("\n/* character classification table */\n", cfile);
209 init("is_type");
210 add("0123456789", "ISDIGIT");
211 add("abcdefghijklmnopqrstuvwxyz", "ISLOWER");
212 add("ABCDEFGHIJKLMNOPQRSTUVWXYZ", "ISUPPER");
213 add("_", "ISUNDER");
214 add("#?$!-*@", "ISSPECL");
215 finish();
216
217 exit(0);
218 }
219
220
221 /*
222 * Output the header and declaration of a syntax table.
223 */
224
225 static void
init(const char * name)226 init(const char *name)
227 {
228 fprintf(hfile, "extern const char %s[];\n", name);
229 fprintf(cfile, "const char %s[SYNBASE + CHAR_MAX + 1] = {\n", name);
230 }
231
232
233 static void
add_one(const char * key,const char * type)234 add_one(const char *key, const char *type)
235 {
236 fprintf(cfile, "\t[SYNBASE + %s] = %s,\n", key, type);
237 }
238
239
240 /*
241 * Add default values to the syntax table.
242 */
243
244 static void
add_default(void)245 add_default(void)
246 {
247 add_one("PEOF", "CEOF");
248 add_one("CTLESC", "CCTL");
249 add_one("CTLVAR", "CCTL");
250 add_one("CTLENDVAR", "CCTL");
251 add_one("CTLBACKQ", "CCTL");
252 add_one("CTLBACKQ + CTLQUOTE", "CCTL");
253 add_one("CTLARI", "CCTL");
254 add_one("CTLENDARI", "CCTL");
255 add_one("CTLQUOTEMARK", "CCTL");
256 add_one("CTLQUOTEEND", "CCTL");
257 }
258
259
260 /*
261 * Output the footer of a syntax table.
262 */
263
264 static void
finish(void)265 finish(void)
266 {
267 fputs("};\n", cfile);
268 }
269
270
271 /*
272 * Add entries to the syntax table.
273 */
274
275 static void
add(const char * p,const char * type)276 add(const char *p, const char *type)
277 {
278 for (; *p; ++p) {
279 char c = *p;
280 switch (c) {
281 case '\t': c = 't'; break;
282 case '\n': c = 'n'; break;
283 case '\'': c = '\''; break;
284 case '\\': c = '\\'; break;
285
286 default:
287 fprintf(cfile, "\t[SYNBASE + '%c'] = %s,\n", c, type);
288 continue;
289 }
290 fprintf(cfile, "\t[SYNBASE + '\\%c'] = %s,\n", c, type);
291 }
292 }
293
294
295 /*
296 * Output character classification macros (e.g. is_digit). If digits are
297 * contiguous, we can test for them quickly.
298 */
299
300 static const char *macro[] = {
301 "#define is_digit(c)\t((unsigned int)((c) - '0') <= 9)",
302 "#define is_eof(c)\t((c) == PEOF)",
303 "#define is_alpha(c)\t((is_type+SYNBASE)[(int)c] & (ISUPPER|ISLOWER))",
304 "#define is_name(c)\t((is_type+SYNBASE)[(int)c] & (ISUPPER|ISLOWER|ISUNDER))",
305 "#define is_in_name(c)\t((is_type+SYNBASE)[(int)c] & (ISUPPER|ISLOWER|ISUNDER|ISDIGIT))",
306 "#define is_special(c)\t((is_type+SYNBASE)[(int)c] & (ISSPECL|ISDIGIT))",
307 "#define digit_val(c)\t((c) - '0')",
308 NULL
309 };
310
311 static void
output_type_macros(void)312 output_type_macros(void)
313 {
314 const char **pp;
315
316 for (pp = macro ; *pp ; pp++)
317 fprintf(hfile, "%s\n", *pp);
318 }
319