3 * Scanner for C declarations.
4 * Copyright © 2011, 2021, 2023 Nick Bowler
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
27 %option nodefault noyywrap bison-locations reentrant never-interactive
28 %option extra-type="int"
29 %option prefix="cdecl__yy"
33 #include "cdecl-internal.h"
38 /* Best case, implementation provides strtoumax. */
39 # define STRTOUMAX strtoumax
41 /* Fall back to strtoull, with possibly reduced range. */
42 #define STRTOUMAX strtoull
44 /* HP-UX 11 has __strtoull in <inttypes.h> */
45 #define STRTOUMAX __strtoull
47 /* Fall back to strtoul, with possibly reduced range. */
48 #define STRTOUMAX strtoul
51 static char *to_octal(char *dst, unsigned val)
55 for (i = 0; i < 3; i++) {
56 *dst++ = '0' + ((val >> 6) & 7u);
64 * Convert a single character to a C-style character constant, including quote
65 * characters. At most 7 bytes are written to the buffer for the longest
66 * octal encoding, e.g., '\177'
68 static void to_readable_ch(char *dst, char c)
75 * The 7 standard C control characters are contiguous in ASCII,
76 * permitting a simple and compact lookup table; separating their
77 * handling from backslash and quote characters hopefully allows
78 * the compiler to recognize that.
81 case '\a': i = 0; break;
82 case '\b': i = 1; break;
83 case '\t': i = 2; break;
84 case '\n': i = 3; break;
85 case '\v': i = 4; break;
86 case '\f': i = 5; break;
87 case '\r': i = 6; break;
88 default: i = 7; break;
92 /* Otherwise printable characters that should still be escaped. */
94 case '\\': case '\'': esc = c; break;
101 } else if (isprint(uc)) {
105 dst = to_octal(dst, uc);
113 IDENT [_[:alpha:]][-_[:alnum:]]*
114 INTEGER 0x[[:xdigit:]]+|0[0-7]+|[[:digit:]]+
123 unsigned char *match;
124 static const unsigned char tab[2][8] = {
127 PACK_TOKEN(T_ASTERISK),
128 PACK_TOKEN(T_LBRACKET),
129 PACK_TOKEN(T_RBRACKET),
130 PACK_TOKEN(T_LPAREN),
131 PACK_TOKEN(T_RPAREN),
133 PACK_TOKEN(T_ELLIPSIS),
134 PACK_TOKEN(T_SEMICOLON)
138 match = memchr(&tab, yytext[0], sizeof tab[0]);
139 return UNPACK_TOKEN(match[sizeof tab[0]]);
146 yylval->uintval = STRTOUMAX(yytext, &end, 0);
147 if (errno == ERANGE) {
148 cdecl__errmsg(CDECL__ERANGE);
152 cdecl__errmsg(CDECL__EBADINT);
160 int len = yyleng, tok;
163 x = cdecl__to_keyword(yytext, len, yyextra);
164 yylval->spectype = UNPACK_SPEC(x & 0xff);
165 if ((tok = (x >> 8)) == PACK_TOKEN(T_IDENT)) {
167 * Our IDENT pattern includes hyphens so we can match
168 * "variable-length" as a keyword. In all other cases a
169 * hyphen is an error.
171 * We could use yyless to re-scan the hyphen and hit the
172 * error catch-all, but jumping straight to the error code
173 * seems to produce better results with gcc with no obvious
177 if ((c = memchr(yytext, '-', len)))
180 yyless(strcspn(yytext, "-"));
182 if (!(yylval->item = cdecl__alloc_item(len+1)))
183 return T_LEX_ERROR; \
184 memcpy(yylval->item->s, yytext, len+1);
186 return UNPACK_TOKEN(tok);
195 to_readable_ch(buf, *c);
196 cdecl__err(CDECL_ENOPARSE, _("syntax error, unexpected %s"), buf);