3 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
5 * Copyright (c) 2011 James Gritton
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
43 static ssize_t text2lval(size_t triml, size_t trimr, int tovar);
46 static int lineno = 1;
48 #define YY_DECL int yylex(void)
58 /* Whitespace or equivalent */
62 <_>\/\*([^*]|(\*+([^*\/])))*\*+\/ {
65 for (s = yytext; s < yytext + yyleng; s++)
85 /* Atomic (unquoted) strings */
86 <_,DQ>[A-Za-z0-9_!%&()\-.:<>?@\[\]^`|~]+ |
87 <_,DQ>\\(.|\n|[0-7]{1,3}|x[0-9A-Fa-f]{1,2}) |
89 (void)text2lval(0, 0, 0);
90 return instr ? STR1 : (instr = 1, STR);
93 /* Single and double quoted strings */
94 <_>'([^\'\\]|\\(.|\n))*' {
95 (void)text2lval(1, 1, 0);
96 return instr ? STR1 : (instr = 1, STR);
98 <_>\"([^"\\]|\\(.|\n))*\" |
99 <DQ>[^\"$\\]([^"\\]|\\(.|\n))*\" {
103 skip = yytext[0] == '"' ? 1 : 0;
104 atvar = text2lval(skip, 1, 1);
109 * The string has a variable inside it.
110 * Go into DQ mode to get the variable
111 * and then the rest of the string.
116 return instr ? STR1 : (instr = 1, STR);
120 /* Variables, single-word or bracketed */
121 <_,DQ>$[A-Za-z_][A-Za-z_0-9]* {
122 (void)text2lval(1, 0, 0);
123 return instr ? VAR1 : (instr = 1, VAR);
125 <_>$\{([^\n{}]|\\(.|\n))*\} |
126 <DQ>$\{([^\n\"{}]|\\(.|\n))*\} {
127 (void)text2lval(2, 1, 0);
128 return instr ? VAR1 : (instr = 1, VAR);
131 /* Partially formed bits worth complaining about */
132 <_>\/\*([^*]|(\*+([^*\/])))*\** {
133 warnx("%s line %d: unterminated comment",
137 <_>'([^\n'\\]|\\.)* |
138 <_>\"([^\n\"\\]|\\.)* {
139 warnx("%s line %d: unterminated string",
143 <_>$\{([^\n{}]|\\.)* |
144 <DQ>$\{([^\n\"{}]|\\.)* {
145 warnx("%s line %d: unterminated variable",
150 /* A hack because "<0>" rules aren't allowed */
151 <_>. return yytext[0];
160 yyerror(const char *s)
163 warnx("%s line %d: %s", cfname, lineno, s);
165 warnx("%s: unexpected EOF", cfname);
167 warnx("%s line %d: %s: %s", cfname, lineno, yytext, s);
171 * Copy string from yytext to yylval, handling backslash escapes,
172 * and optionally stopping at the beginning of a variable.
175 text2lval(size_t triml, size_t trimr, int tovar)
180 yylval.cs = d = emalloc(yyleng - trimr - triml + 1);
181 se = yytext + (yyleng - trimr);
182 for (s = yytext + triml; s < se; s++, d++) {
184 if (tovar && *s == '$') {
194 if (*s >= '0' && *s <= '7') {
196 if (s + 1 < se && s[1] >= '0' && s[1] <= '7') {
197 *d = 010 * *d + (*++s - '0');
198 if (s + 1 < se && s[1] >= '0' && s[1] <= '7')
199 *d = 010 * *d + (*++s - '0');
204 case 'a': *d = '\a'; break;
205 case 'b': *d = '\b'; break;
206 case 'f': *d = '\f'; break;
207 case 'n': *d = '\n'; break;
208 case 'r': *d = '\r'; break;
209 case 't': *d = '\t'; break;
210 case 'v': *d = '\v'; break;
211 case '\n': d--; lineno++; break;
212 default: *d = *s; break;
217 if (s[1] >= '0' && s[1] <= '9')
219 else if (s[1] >= 'A' && s[1] <= 'F')
220 *d = *++s + (0xA - 'A');
221 else if (s[1] >= 'a' && s[1] <= 'f')
222 *d = *++s + (0xa - 'a');
227 if (s[1] >= '0' && s[1] <= '9')
228 *d = *d * 0x10 + (*++s - '0');
229 else if (s[1] >= 'A' && s[1] <= 'F')
230 *d = *d * 0x10 + (*++s + (0xA - 'A'));
231 else if (s[1] >= 'a' && s[1] <= 'f')
232 *d = *d * 0x10 + (*++s + (0xa - 'a'));