You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
31 lines
940 B
C
31 lines
940 B
C
#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);
|
|
} 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;
|
|
n+=l<<1;
|
|
if ((unsigned short)(n+c) < n) break;
|
|
l=n+c;
|
|
++tmp;
|
|
}
|
|
if (tmp-src) *dest=l;
|
|
return tmp-src;
|
|
}
|
|
}
|