using YYLIMIT in re2c - re2c

Question

Thank you in advance!
I'd like to implement a code to analysis ipv4 address format such as "192.168.0.0".
So, I did like this.
#include <stdio.h>
#include <string.h>
typedef struct qppLexerObj
{
char *mCursor;
char *mLimit;
char *mToken;
} qppLexerObj;
int qpfGetOctet(qppLexerObj *aLexer)
{
#define YYFILL(a) \
do \
{ \
if (aLexer->mCursor > aLexer->mLimit) \
{ \
return 0; \
} \
else \
{ \
} \
} while (0);
/*!re2c
re2c:define:YYCTYPE = "unsigned char";
re2c:define:YYCURSOR = aLexer->mCursor;
re2c:define:YYLIMIT = aLexer->mLimit;
re2c:yyfill:enable = 0;
re2c:yyfill:enable = 1;
digit = [0-9];
*/
begin:
aLexer->mToken = aLexer->mCursor;
/*!re2c
digit+ { return 1; }
[\.] { return 2; }
[\*] { return 3; }
. { return 9999; }
*/
}
int main()
{
qppLexerObj aObj;
int a;
char sToken[512];
char *sBuffer = "255.255.255.255";
aObj.mCursor = sBuffer;
aObj.mLimit = aObj.mCursor + strlen(sBuffer);
while ( (a = qpfGetOctet(&aObj)) != 0)
{
int len;
len = aObj.mCursor - aObj.mToken;
memset(sToken, 0, sizeof(sToken));
strncpy(sToken, aObj.mToken, len);
printf("Token = %d(%d) [%s]\n", a, len, sToken);
}
return 0;
}
But, the result is not what I expected.
re2c --case-insensitive -o addr_so.c addr_so.re
gcc -g -o addr_so addr_so.c
Token = 1(3) [255]
Token = 2(1) [.]
Token = 1(3) [255]
Token = 2(1) [.]
Token = 1(3) [255]
Token = 2(1) [.]
Token = 1(3) [255]
Token = 9999(1) [] <=== Wrong code happens!! SHOULD BE 0!
How can I detect the EOF without "9999", wrong code?
re2c seems that it sometimes can't detect EOF successfully.

Answer 1

All looks logical. Just the terminating test is amiss. Recall that limit is set to first address past a valid character, as the re2c man page says to do.
- if (aLexer->mCursor > aLexer->mLimit) \
+ if (aLexer->mCursor >= aLexer->mLimit) \
With this one line change, I get the results I think you expected.
Token = 1(3) [255]
Token = 2(1) [.]
Token = 1(3) [255]
Token = 2(1) [.]
Token = 1(3) [255]
Token = 2(1) [.]