scanning values from a char array

This is a discussion on scanning values from a char array within the C Programming forums, part of the General Programming Boards category; Okay, part of my homework is to read from a logfile and output some specific information. (YES THIS IS HOMEWORK, ...

  1. #1
    Time-Lord Victorious! The Doctor's Avatar
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    Question scanning values from a char array

    Okay, part of my homework is to read from a logfile and output some specific information. (YES THIS IS HOMEWORK, AND NO, I DO NOT WANT YOU TO DO IT FOR ME! )

    I would just like to know if it's possible to scan through a char array, and assign values to variables from it.

    By the way, I haven't even tried to compile this yet, so I don't know if it even compiles. I'm pretty sure this won't work, as I'm passing fscanf() a char*, and not a FILE*.

    Code:
    void outputThings( char* line)
    { 
            int day, hour, min, sec;
            int ii;
    
            char* month;
            char* temp;
            char* process = (char*)malloc(30*sizeof( char));
            char* message = (char*)malloc(200*sizeof( char));
    
            fscanf( line,"%s %d %d:%d:%d    %s: %s", month, &day, &hour, &min, &sec, process, message);
    
            printf("%s %d %d:%d:%d %s: %s\n", month, day, hour, min, sec, process, message);
    
    }
    As I said, I don't want you guys to do this for me, just tell me what function I should be using to scan the array, or tell me I'm going about it the wrong way.

    thanks,
    The Doctor

  2. #2
    and the hat of wrongness Salem's Avatar
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    fscanf reads from a file
    sscanf reads from a string
    scanf reads from stdin
    All do the same thing in terms of conversions and assignments. It's only the source of the characters which differ.

    fgets() and sscanf() is a particularly useful combination.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. #3
    Time-Lord Victorious! The Doctor's Avatar
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    Thank you! I'm sure that's exactly what I needed to know.

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