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Fix decimal constant overflow warning (PR#26)

This commit is contained in:
steve 2000-10-22 22:27:59 +00:00
parent add2ae16fa
commit bb9eb2cd1d
1 changed files with 19 additions and 6 deletions
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25
lexor.lex
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@ -19,7 +19,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT) && !defined(macintosh)
#ident "$Id: lexor.lex,v 1.50 2000/10/14 16:48:59 steve Exp $"
#ident "$Id: lexor.lex,v 1.51 2000/10/22 22:27:59 steve Exp $"
#endif
//# define YYSTYPE lexval
@ -801,15 +801,20 @@ static verinum*make_dec_with_size(unsigned size, bool fixed, const char*ptr)
ptr += 1;
while (*ptr && ((*ptr == ' ') || (*ptr == '\t')))
ptr += 1;
if ((strlen(ptr) * 4) > size)
cerr << yylloc.text << ":" << yylloc.first_line <<
": warning: Numeric decimal constant ``" << ptr <<
"'' truncated to " << size << " bits." << endl;
const char*digits = ptr;
/* Convert the decimal number to a binary value, one digit at
a time. Watch out for overflow. */
unsigned long value = 0;
for ( ; *ptr ; ptr += 1)
if (isdigit(*ptr)) {
unsigned long tmp = value * 10 + (*ptr - '0');
if (tmp < value)
cerr << yylloc.text << ":" << yylloc.first_line <<
": warning: Numeric decimal constant ``"
<< digits << "'' is too large." << endl;
value *= 10;
value += *ptr - '0';
} else {
@ -824,6 +829,14 @@ static verinum*make_dec_with_size(unsigned size, bool fixed, const char*ptr)
value /= 2;
}
/* If we run out of bits to hold the value, but there are
still valueable bits in the number, print a warning. */
if (value != 0)
cerr << yylloc.text << ":" << yylloc.first_line <<
": warning: Numeric decimal constant ``" << digits <<
"'' truncated to " << size << " bits." << endl;
verinum*out = new verinum(bits, size, fixed);
out->has_sign(signed_flag);
delete[]bits;