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%{
#include "pscan.h"
static void skip_strings(char literal);
extern int cur_lineno;
%}
%x comment
%x strings
reserved "default"|"struct"|"void"|"for"|"if"|"else"|"while"|"do"|"return"|"case"|"switch"|"break"|"auto"|"continue"|"goto"|"sizeof"|"static"|"typedef"|"union"|"volatile"|"asm"
vartype "char"|"double"|"enum"|"extern"|"float"|"int"|"long"|"register"|"short"|"signed"|"unsigned"|"const"
cprep "include"|"define"|"undef"|"if"|"else"|"elif"|"endif"|"ifdef"|"ifndef"|"error"|"line"|"pragma"
%%
{reserved} {// Ignore reserved words because issue arises
// if reserved sizeof used as argument to a defined
// problematic function such as snprintf
// but we also do not want to attempt to check these
// for defined issues in setup_checks function as we know
// they are undefined
// Default last_token state is NOT_PROBLEMATIC
// state->last_token = NOT_PROBLEMATIC;
}
{vartype} state->last_token = NOT_PROBLEMATIC;
"#"{cprep} state->last_token = NOT_PROBLEMATIC;
NULL { if ((state->last_token == PROBLEMATIC) &&
(state->constant_string < 0)) {
state->constant_string = state->args;
}
}
\" {
if (state->last_token == PROBLEMATIC) {
if (state->constant_string < 0) {
state->constant_string = state->args;
}
}
skip_strings('"');
}
\' skip_strings('\'');
\/\/[^\n]* /* skip C++ style comments */
[a-zA-Z_][_a-zA-Z0-9]* state = setup_checks(yytext, state);
[ \t]+ /* eat up whitespace */
\( {
if (state->args < 0) state->args = 0;
state->braces++;
if (state->braces > 1) {
state = push_stack(state);
state->last_token = NOT_PROBLEMATIC;
state->braces = 1;
state->args = -1;
}
}
\, if (state->last_token == PROBLEMATIC) {
if (state->braces != 0) {
state->args++;
} else {
state->last_token = NOT_PROBLEMATIC;
}
}
\) if (state->last_token == PROBLEMATIC) {
check_function(state);
state->last_token = NOT_PROBLEMATIC;
} else if (state->braces != 0) {
state->braces--;
if (state->braces == 0) {
state = pop_stack();
}
}
. {
if ((state->last_token == PROBLEMATIC) &&
(state->braces == 0)) {
state->last_token = NOT_PROBLEMATIC;
}
}
"/*" BEGIN(comment);
<comment>[^*\n]* /* eat anything that's not a '*' */
<comment>"*"+[^*/\n]* /* eat up '*'s not followed by '/'s */
<comment>\n {cur_lineno++;}
<comment>"*"+"/" BEGIN(INITIAL);
"\n" { cur_lineno++;}
%%
/**********************************************************************
* pscan: http://www.striker.ottawa.on.ca/~aland/pscan/
*
* Copyright (C) 2000 Alan DeKok <aland@ox.org>
*
* 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 of the License, 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, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
**********************************************************************/
static const char rcsid[] = "$Id: scanner.l,v 1.4 2000/07/17 18:51:45 aland Exp $";
/* static */
void skip_strings(char literal)
{
int c,last_c=0,done=0;
while (!done)
{
c=input();
if (c==EOF)
return;
if ((last_c!='\\') && (c==literal)) // non escaped literal found
done=1;
else if ((last_c=='\\') && (c=='\\')) // avoid \\ issue
last_c=0;
else
last_c=c;
}
return;
}
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