1 /* Lexer for scanner of bytecode definition file.
2 Copyright (C) 1993 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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. */
22 #include "bi-parser.h"
24 /* Current read buffer and point */
25 static char *buffer = NULL;
26 static char *inpoint = NULL;
29 /* Safely allocate NBYTES bytes of memory. Reuturns pointer to block of
36 char *tmp = (char *) malloc (nbytes);
40 fprintf (stderr, "can't allocate %d bytes (out of virtual memory)\n", nbytes);
41 exit (FATAL_EXIT_CODE);
48 /* Safely reallocate BLOCK so its size becomes NBYTES.
49 The block returned may be different from the one supplied. */
52 xrealloc (block, nbytes)
57 ? (char *) realloc (block, nbytes)
58 : (char *) malloc (nbytes));
62 fprintf (stderr, "can't reallocate %d bytes (out of virtual memory)\n", nbytes);
63 exit (FATAL_EXIT_CODE);
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. */
84 while ((c = getc (stdin)) != EOF
85 && c != '#' && c != '(' && c != ')' && c != ',')
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))
91 int previous_point_index = point - buffer;
93 buffer_size = (!buffer_size ? 32 : buffer_size * 2);
95 buffer = xmalloc (buffer_size);
97 buffer = xrealloc (buffer, buffer_size);
99 point = buffer + previous_point_index;
107 /* Catch special case: backslash at end of file */
130 /* First char determines what token we're looking at */
143 /* Ignore whitespace */
147 /* Comments advance to next line */
148 while ((c = getc (stdin)) != '\n' && c != EOF);
152 if (c != '(' && c != ')' && c != '\\' && c != ',')
155 yylval.string = scan_string ();
157 /* Check if string is "define_operator"; if so, return
158 a DEFOP token instead. */
159 if (!strcmp (yylval.string, "define_operator"))
161 free (yylval.string);