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6a94387c JB |
1 | /* Lexer for scanner of bytecode definition file. |
2 | Copyright (C) 1993 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC 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 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC 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. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include <stdio.h> | |
a2c18d49 | 21 | #include "hconfig.h" |
6a94387c JB |
22 | #include "bi-parser.h" |
23 | ||
6a94387c JB |
24 | /* Current read buffer and point */ |
25 | static char *buffer = NULL; | |
26 | static char *inpoint = NULL; | |
27 | ||
28 | ||
29 | /* Safely allocate NBYTES bytes of memory. Reuturns pointer to block of | |
30 | memory. */ | |
31 | ||
32 | static char * | |
33 | xmalloc (nbytes) | |
34 | int nbytes; | |
35 | { | |
e4f316db | 36 | char *tmp = (char *) malloc (nbytes); |
6a94387c JB |
37 | |
38 | if (!tmp) | |
39 | { | |
40 | fprintf (stderr, "can't allocate %d bytes (out of virtual memory)\n", nbytes); | |
41 | exit (1); | |
42 | } | |
43 | ||
44 | return tmp; | |
45 | } | |
46 | ||
47 | ||
48 | /* Safely reallocate BLOCK so its size becomes NBYTES. | |
49 | The block returned may be different from the one supplied. */ | |
50 | ||
51 | static char * | |
52 | xrealloc (block, nbytes) | |
53 | char *block; | |
54 | int nbytes; | |
55 | { | |
e4f316db RS |
56 | char *tmp = (block |
57 | ? (char *) realloc (block, nbytes) | |
58 | : (char *) malloc (nbytes)); | |
6a94387c JB |
59 | |
60 | if (!tmp) | |
61 | { | |
62 | fprintf (stderr, "can't reallocate %d bytes (out of virtual memory)\n", nbytes); | |
63 | exit (1); | |
64 | } | |
65 | ||
66 | return tmp; | |
67 | } | |
68 | ||
69 | ||
70 | /* Scan for string token on standard input. A string is, for our | |
71 | purposes here, a sequence of characters that starts with the regexp | |
72 | ``[^ #\t\n(),]'' and is then followed by the regexp ``[^#(),]*''. Any | |
73 | character is accepted if preceded by a backslash, "\\". It is assumed | |
74 | that the first character has already been checked by the main loop. */ | |
75 | ||
76 | static char * | |
77 | scan_string () | |
78 | { | |
79 | char *buffer = NULL; | |
80 | char *point = NULL; | |
81 | int buffer_size = 0; | |
82 | int c; | |
83 | ||
84 | while ((c = getc (stdin)) != EOF | |
85 | && c != '#' && c != '(' && c != ')' && c != ',') | |
86 | { | |
87 | /* Extend buffer, if necessary (minus two so there's room for the NUL | |
88 | trailer as well as another character if this one is a backslash). */ | |
89 | if (!buffer_size || (point - buffer >= buffer_size-2)) | |
90 | { | |
91 | int previous_point_index = point - buffer; | |
92 | ||
93 | buffer_size = (!buffer_size ? 32 : buffer_size * 2); | |
56ae2659 | 94 | if (!buffer) |
6a94387c JB |
95 | buffer = xmalloc (buffer_size); |
96 | else | |
97 | buffer = xrealloc (buffer, buffer_size); | |
98 | ||
99 | point = buffer + previous_point_index; | |
100 | } | |
101 | *point++ = c & 0xff; | |
102 | ||
103 | if (c == '\\') | |
104 | { | |
105 | c = getc (stdin); | |
106 | ||
107 | /* Catch special case: backslash at end of file */ | |
108 | if (c == EOF) | |
109 | break; | |
110 | ||
111 | *point++ = c; | |
112 | } | |
113 | } | |
114 | *point = 0; | |
115 | ||
116 | if (c != EOF) | |
117 | ungetc (c, stdin); | |
118 | ||
119 | return buffer; | |
120 | } | |
121 | ||
122 | ||
123 | int | |
124 | yylex () | |
125 | { | |
126 | int c; | |
127 | char *token; | |
128 | ||
129 | ||
130 | /* First char determines what token we're looking at */ | |
131 | for (;;) | |
132 | { | |
133 | c = getc (stdin); | |
134 | ||
135 | switch (c) | |
136 | { | |
137 | case EOF: | |
138 | return 0; | |
139 | ||
140 | case ' ': | |
141 | case '\t': | |
142 | case '\n': | |
143 | /* Ignore whitespace */ | |
144 | continue; | |
145 | ||
146 | case '#': | |
147 | /* Comments advance to next line */ | |
148 | while ((c = getc (stdin)) != '\n' && c != EOF); | |
149 | continue; | |
150 | ||
151 | default: | |
152 | if (c != '(' && c != ')' && c != '\\' && c != ',') | |
153 | { | |
154 | ungetc (c, stdin); | |
155 | yylval.string = scan_string (); | |
156 | ||
157 | /* Check if string is "define_operator"; if so, return | |
158 | a DEFOP token instead. */ | |
159 | if (!strcmp (yylval.string, "define_operator")) | |
160 | { | |
161 | free (yylval.string); | |
162 | yylval.string = 0; | |
163 | return DEFOP; | |
164 | } | |
165 | return STRING; | |
166 | } | |
167 | return c & 0xff; | |
168 | } | |
169 | } | |
170 | } |