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quote: we must do unsigned comparison to get length of octal escape

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When computing the length of an octal escape, we need to do an
unsigned compare, otherwise we only allocate space for one character
for bytes in the \200..\377 range, which is obviously incorrect.

Reported-by: Ed Beroset <beroset@mindspring.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2009-07-15 16:22:47 -04:00
parent 89cee57ad0
commit 13028a5a19
1 changed files with 12 additions and 11 deletions
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23
quote.c
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@ -48,6 +48,7 @@
char *nasm_quote(char *str, size_t len)
{
char c, c1, *p, *q, *nstr, *ep;
unsigned char uc;
bool sq_ok, dq_ok;
size_t qlen;
@ -86,12 +87,12 @@ char *nasm_quote(char *str, size_t len)
default:
c1 = (p+1 < ep) ? p[1] : 0;
if (c1 >= '0' && c1 <= '7')
c1 = 0377; /* Must use the full form */
uc = 0377; /* Must use the full form */
else
c1 = c;
if (c1 > 077)
uc = c;
if (uc > 077)
qlen++;
if (c1 > 07)
if (uc > 07)
qlen++;
qlen += 2;
break;
@ -158,15 +159,15 @@ char *nasm_quote(char *str, size_t len)
if (c < ' ' || c > '~') {
c1 = (p+1 < ep) ? p[1] : 0;
if (c1 >= '0' && c1 <= '7')
c1 = 0377; /* Must use the full form */
uc = 0377; /* Must use the full form */
else
c1 = c;
uc = c;
*q++ = '\\';
if (c1 > 077)
*q++ = (c >> 6) + '0';
if (c1 > 07)
*q++ = ((c >> 3) & 7) + '0';
*q++ = (c & 7) + '0';
if (uc > 077)
*q++ = ((unsigned char)c >> 6) + '0';
if (uc > 07)
*q++ = (((unsigned char)c >> 3) & 7) + '0';
*q++ = ((unsigned char)c & 7) + '0';
break;
} else {
*q++ = c;