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