31 lines
909 B

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