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#include "fmt.h"
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#include "haveinline.h"
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static inline char tohex(char c) {
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return (char)(c>=10?c-10+'a':c+'0');
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}
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size_t fmt_xlong(char *dest,unsigned long i) {
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register unsigned long len,tmp;
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/* first count the number of bytes needed */
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for (len=1, tmp=i; tmp>15; ++len) tmp>>=4;
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if (dest)
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for (tmp=i, dest+=len; ; ) {
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*--dest = tohex(tmp&15);
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if (!(tmp>>=4)) break;
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}
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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_xlong(buf,0x12345)==5 && !memcmp(buf,"12345",5));
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return 0;
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}
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#endif
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