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/* scan-decls.c - Extracts declarations from cpp output.
Copyright (C) 1993 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* This filter scans a C source file (actually, the output of cpp).
It looks for function declaration. For each declaration, it prints:
NAME;C;RTYPE;ARGS;FILENAME;LINENO;
NAME is the function's name.
C is "F" if the declaration is nested inside 'extern "C"' braces;
otherwise "f".
RTYPE is the function's return type.
ARGS is the function's argument list.
FILENAME and LINENO is where the declarations was seen
(taking #-directives into account).
Also:
NAME;M;
indicates that the macro NAME was seen (when invoked from fixproto).
NAME;X;TYPE;
indicates that 'extern TYPE NAME;' was seen.
Written by Per Bothner <bothner@cygnus.com>, July 1993.
*/
#include <stdio.h>
#include <ctype.h>
#include "scan.h"
sstring buf;
sstring rtype;
int brace_nesting = 0;
/* The first extern_C_braces_length elements of extern_C_braces
indicate the (brace nesting levels of) left braces that were
prefixed by extern "C". */
int extern_C_braces_length = 0;
char extern_C_braces[20];
#define in_extern_C_brace (extern_C_braces_length>0)
/* True if the function declaration currently being scanned is
prefixed by extern "C". */
int current_extern_C = 0;
int
main ()
{
FILE *fp = stdin;
int c;
int saw_extern;
new_statement:
c = get_token (fp, &buf);
handle_statement:
current_extern_C = 0;
saw_extern = 0;
if (c == '}')
{
/* pop an 'extern "C"' nesting level, if appropriate */
if (extern_C_braces_length
&& extern_C_braces[extern_C_braces_length - 1] == brace_nesting)
extern_C_braces_length--;
brace_nesting--;
goto new_statement;
}
if (c == '{')
{
brace_nesting++;
goto new_statement;
}
if (c == EOF)
return 0;
if (c == ';')
goto new_statement;
if (c != IDENTIFIER_TOKEN)
goto new_statement;
rtype.ptr = rtype.base;
if (SSTRING_LENGTH (&buf) > 16
&& strncmp (buf.base, "__DEFINED_MACRO_", 16) == 0)
{
fprintf (stdout, "%s;M;\n", buf.base+16);
goto new_statement;
}
if (strcmp (buf.base, "extern") == 0)
{
saw_extern = 1;
c = get_token (fp, &buf);
if (c == STRING_TOKEN && strcmp (buf.base, "C") == 0)
{
current_extern_C = 1;
c = get_token (fp, &buf);
if (c == '{')
{
brace_nesting++;
extern_C_braces[extern_C_braces_length++] = brace_nesting;
goto new_statement;
}
c = get_token (fp, &buf);
}
}
for (;;)
{
int followingc = getc (fp); /* char following token in buf */
if (c == IDENTIFIER_TOKEN)
{
int nextc = skip_spaces (fp, followingc);
if (nextc == '(')
{
int nesting = 1;
MAKE_SSTRING_SPACE(&rtype, 1);
*rtype.ptr = 0;
fprintf (stdout, "%s;%s;%s;",
buf.base,
in_extern_C_brace || current_extern_C ? "F" : "f",
rtype.base);
c = skip_spaces (fp, ' ');
for (;;)
{
if (c == '(')
nesting++;
else if (c == ')')
if (--nesting == 0)
break;
if (c == EOF)
break;
if (c == '\n')
c = ' ';
putc (c, stdout);
c = getc (fp);
}
fprintf (stdout, ";%s;%d;\n",
source_filename.base, source_lineno);
goto new_statement;
}
else if (nextc == ';' && saw_extern)
{
fprintf (stdout, "%s;X;%s;\n", buf.base, rtype.base);
goto handle_statement;
}
else
ungetc (nextc, fp);
}
else if (followingc != EOF)
ungetc (followingc, fp);
if (c == ';' || c == '{' || c == '}' || c == EOF)
goto handle_statement;
sstring_append (&rtype, &buf);
if (followingc == ' ' || followingc == '\t' || followingc == '\n')
SSTRING_PUT(&rtype, ' ');
c = get_token (fp, &buf);
}
}
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