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http://www.openoffice.org/issues/show_bug.cgi?id=92736
Issue #|92736
Summary|Crash in hunspell with Windows non-pro versions
Component|Word processor
Version|DEV300m26
Platform|All
URL|
OS/Version|All
Status|NEW
Status whiteboard|
Keywords|
Resolution|
Issue type|DEFECT
Priority|P3
Subcomponent|code
Assigned to|tl
Reported by|tl
------- Additional comments from [EMAIL PROTECTED] Wed Aug 13 08:12:34 +0000
2008 -------
In hunspells code (at least in phonet.c) there are calls like
isalpha(word[i+k])
and
isdigit (*s)
Which may cause the program to crash with in Windows C runtime library because
of running into assertions.
The problem is the usage of function like
int isalnum(int c);
int isalpha(int c);
int isascii(int c);
int isblank(int c);
int iscntrl(int c);
int isdigit(int c);
int isgraph(int c);
int islower(int c);
int isprint(int c);
int ispunct(int c);
int isspace(int c);
int isupper(int c);
int isxdigit(int c);
Which are declared to take a (signed) int as parameter.
When those function are called for 'char' type paramters like
const char * s;
char word[MAXPHONETUTF8LEN + 1];
in phonet.c and they hold values from the higher half of the code page (chars
>127) e.g. for accented characters or German Umlaute those are represented as
signed chars and thus there value is negative (e.g. such as -55) when that value
is handed over as int parameter sign propagation comes into effect and the
resulting in will still be negative (-55). But interpreted as unsigned int it's
value is higher than 256 and the Windows runtime assertion will cause the
program to crash.
Solution:
When calling the above listed function all arguments must be converted to
unsigned character first before calling them!
That is the code needs to looks like
isalpha((unsigned char) word[i+k])
and
isdigit ((unsigned char) *s)
You Probably like to introduce an inline functions like
int MyIsAlpha(char c)
{
return isalpha((unsigned char) c)
}
for better handling of this problem...
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