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23 lines
487 B
C
23 lines
487 B
C
#include "fmt.h"
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size_t fmt_ulong(char *dest,unsigned long i) {
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register unsigned long len,tmp,len2;
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/* first count the number of bytes needed */
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for (len=1, tmp=i; tmp>9; ++len) tmp/=10;
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if (dest)
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for (tmp=i, dest+=len, len2=len+1; --len2; tmp/=10)
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*--dest = (char)((tmp%10)+'0');
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return len;
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}
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#ifdef UNITTEST
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#include <assert.h>
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#include <string.h>
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int main() {
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char buf[100];
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assert(fmt_ulong(buf,12345)==5 && !memcmp(buf,"12345",5));
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return 0;
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}
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#endif
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