Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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22 years ago
#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) */
size_t 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);
} if (sizeof(unsigned short) < sizeof(unsigned long)) {
const char* cur;
unsigned short l;
for (cur=src,l=0; *cur>='0' && *cur<='9'; ++cur) {
unsigned long tmp=l*10ul+*cur-'0';
if ((unsigned short)tmp != tmp) break;
l=tmp;
}
if (cur>src) *dest=l;
return (size_t)(cur-src);
} else {
register const char *tmp=src;
register unsigned short int l=0;
register unsigned char c;
while ((c=(unsigned char)(*tmp-'0'))<10) {
unsigned short int n;
/* division is very slow on most architectures */
n=(unsigned short)(l<<3); if ((n>>3)!=l) break;
if ((unsigned short)(n+(l<<1)) < n) break;
n=(unsigned short)(n+(l<<1));
if ((unsigned short)(n+c) < n) break;
l=(unsigned short)(n+c);
++tmp;
}
if (tmp-src) *dest=l;
return (size_t)(tmp-src);
}
22 years ago
}