xref: /freebsd/usr.bin/m4/tokenizer.l (revision e17f5b1d)
1 %option nounput noinput
2 %{
3 /* $OpenBSD: tokenizer.l,v 1.9 2017/06/15 13:48:42 bcallah Exp $ */
4 /*
5  * Copyright (c) 2004 Marc Espie <espie@cvs.openbsd.org>
6  *
7  * Permission to use, copy, modify, and distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18  *
19  * $FreeBSD$
20  */
21 #include "parser.h"
22 #include <assert.h>
23 #include <stdlib.h>
24 #include <errno.h>
25 #include <stdint.h>
26 #include <limits.h>
27 
28 extern void m4_warnx(const char *, ...);
29 extern int mimic_gnu;
30 extern int32_t yylval;
31 
32 int32_t number(void);
33 int32_t parse_radix(void);
34 extern int yylex(void);
35 
36 #define	YY_DECL	int yylex(void)
37 %}
38 
39 delim 	[ \t\n]
40 ws	{delim}+
41 hex	0[xX][0-9a-fA-F]+
42 oct	0[0-7]*
43 dec	[1-9][0-9]*
44 radix	0[rR][0-9]+:[0-9a-zA-Z]+
45 
46 %option noyywrap
47 
48 %%
49 {ws}			{/* just skip it */}
50 {hex}|{oct}|{dec}	{ yylval = number(); return(NUMBER); }
51 {radix}			{ if (mimic_gnu) {
52 				yylval = parse_radix(); return(NUMBER);
53 			  } else {
54 			  	return(ERROR);
55 			  }
56 			}
57 "<="			{ return(LE); }
58 ">="			{ return(GE); }
59 "<<"			{ return(LSHIFT); }
60 ">>"			{ return(RSHIFT); }
61 "=="			{ return(EQ); }
62 "!="			{ return(NE); }
63 "&&"			{ return(LAND); }
64 "||"			{ return(LOR); }
65 "**"			{ if (mimic_gnu) { return (EXPONENT); } }
66 .			{ return yytext[0]; }
67 %%
68 
69 int32_t
70 number(void)
71 {
72 	long l;
73 
74 	errno = 0;
75 	l = strtol(yytext, NULL, 0);
76 	if (((l == LONG_MAX || l == LONG_MIN) && errno == ERANGE) ||
77 	    l > INT32_MAX || l < INT32_MIN) {
78 		m4_warnx("numeric overflow in expr: %s", yytext);
79 	}
80 	return l;
81 }
82 
83 int32_t
84 parse_radix(void)
85 {
86 	long base;
87 	char *next;
88 	long l;
89 	int d;
90 
91 	l = 0;
92 	base = strtol(yytext+2, &next, 0);
93 	if (base > 36 || next == NULL) {
94 		m4_warnx("error in number %s", yytext);
95 	} else {
96 		next++;
97 		while (*next != 0) {
98 			if (*next >= '0' && *next <= '9')
99 				d = *next - '0';
100 			else if (*next >= 'a' && *next <= 'z')
101 				d = *next - 'a' + 10;
102 			else {
103 				assert(*next >= 'A' && *next <= 'Z');
104 				d = *next - 'A' + 10;
105 			}
106 			if (d >= base) {
107 				m4_warnx("error in number %s", yytext);
108 				return 0;
109 			}
110 			l = base * l + d;
111 			next++;
112 		}
113 	}
114 	return l;
115 }
116 
117