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.
32 lines
1.1 KiB
C
32 lines
1.1 KiB
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);
|
|
} if (sizeof(unsigned short) < sizeof(unsigned long)) {
|
|
/* this is the regular case */
|
|
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 {
|
|
/* the C standard says that sizeof(short) <= sizeof(unsigned int) <=
|
|
* sizeof(unsigned long); this can never happen. Provoke a compile
|
|
* error if it does */
|
|
char compileerror[sizeof(unsigned long)-sizeof(unsigned short)];
|
|
(void)compileerror;
|
|
}
|
|
}
|