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libowfat/scan/scan_ulong.c

15 lines
322 B

#include "scan.h"
unsigned int scan_ulong(const char* src,unsigned long int* dest) {
register const char *tmp=src;
register unsigned long int l=0;
register unsigned char c;
while ((c=*tmp-'0')<10) {
unsigned long int m=l;
l=l*10+c;
if ((l>>3) < m) break;
++tmp;
}
*dest=l;
return tmp-src;
}