31 lines
915 B

#include "scan.h"
/* this is cut and paste from scan_ulong instead of calling scan_ulong
* because this way scan_ushort can abort scanning when the number would
* not fit into an unsigned short (as opposed to not fitting in an
* unsigned long) */
unsigned int scan_ushort(const char* src,unsigned short* dest) {
if (sizeof(unsigned short) == sizeof(unsigned int)) {
/* a good optimizing compiler should remove the else clause when not
* needed */
return scan_uint(src,(unsigned int*)dest);
} else {
register const char *tmp=src;
register unsigned short int l=0;
register unsigned char c;
while ((c=*tmp-'0')<10) {
unsigned short int n;
/* division is very slow on most architectures */
n=l<<3; if ((n>>3)!=l) break;
if (n+(l<<1) < n) break;
if (n+c < n) break;
return tmp-src;