lkml.org 
[lkml]   [2004]   [Feb]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: printk and long long
    On Wed, 11 Feb 2004 wdebruij@dds.nl wrote:

    > how about simply using a shift to output two regular longs, i.e.
    >
    > printk("%ld%ld",loff_t >> (sizeof(long) * 8), loff_t << sizeof(long) * 8 >>
    > sizeof(long) * 8);
    >
    > perhaps you could even place this ghastly code in a macro if you have to access
    > it often (so that you don't have to look at it :)?
    >
    > I know it's not pretty, but at least the %ld is considered standard printf
    > functionality. I don't think %lld (even if it is implemented in some printf
    > derivates) can be considered portable.
    >
    > Willem
    > Citeren sting sting <zstingx@hotmail.com>:
    >
    > > Hello,
    > > I am trying to perfrom printk with a variable of type long long.
    > > (loff_t is that type and it is long long , as can be seen in
    > > posix+types.h).
    > > what is the format string for such a type ?
    > > I had tried %lld" but it gace wrpng results.
    > > regards,
    > > sting

    This is probably portable. I could do it much simpler in
    assembly but it wouldn't be portable.

    Printing both unsigned long long and signed long long.




    #include <stdio.h>

    unsigned long long tester0 = 12345678901234567890ULL;
    unsigned long long tester1 = 0xffffffffffffffff;


    char *ulltoa(char *buf, unsigned long long val)
    {
    char tmp[0x20];
    char *cp = tmp;
    char *rp = buf;
    do {
    *cp++ = (char) (val%10ULL) + '0';
    val /= 10ULL;
    } while (val);
    do {
    *buf++ = *(--cp);
    } while (cp != tmp);
    *buf = 0x00;
    return rp;
    }

    char *lltoa(char *buf, long long val)
    {
    char *cp = buf;
    if(val < 0) {
    *cp++ = (char) '-';
    val = ~val + 1LL;
    }
    (void) ulltoa(cp, (unsigned long)val);
    return buf;
    }

    int main()
    {
    char buf[0x100];

    printf("%llu\n", 0ULL);
    printf("%llu\n", tester0);
    printf("%llu\n", tester1);
    printf("%s\n", ulltoa(buf, 0ULL));
    printf("%s\n", ulltoa(buf, tester0));
    printf("%s\n", ulltoa(buf, tester1));
    printf("%s\n", lltoa(buf, tester1));

    return 0;
    }



    Cheers,
    Dick Johnson
    Penguin : Linux version 2.4.24 on an i686 machine (797.90 BogoMips).
    Note 96.31% of all statistics are fiction.


    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 14:00    [W:0.061 / U:0.144 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site