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sscanf does not work properly

Mik Kleshov

I started to use the sscanf function to parse commands from serial port and found out that it does not work as it must do. Example:

int i, j = 0x1234;
char c = '\0';
i = sscanf("anything", "%d%c", &j, &c);
After the function call:
i == 1,
j == 0,
c == 'a',
while there should have been:
i == 0,
j == 0x1234,
c == '\0'.

Obviously, I cannot detect some errors in the input with this 'non-ANSI' sscanf. Does anyone have any ideas how to solve the problem?

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  • 0 in reply to Dan Henry

    As soon as I read my own question the answer came to me :-) I can detect errors in the input by checking if the c field has been modified by sscanf (since I cannot rely on the return value).
    It will do as a workaround. Clearly there is an error in the implementation of a library function. Hopefully, Keil Software will fix that soon.

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  • 0 in reply to Dan Henry

    As soon as I read my own question the answer came to me :-) I can detect errors in the input by checking if the c field has been modified by sscanf (since I cannot rely on the return value).
    It will do as a workaround. Clearly there is an error in the implementation of a library function. Hopefully, Keil Software will fix that soon.

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