1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
#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) */
size_t 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 if (sizeof(unsigned int) < sizeof(unsigned long)) {
const char* cur;
unsigned int l;
for (cur=src,l=0; *cur>='0' && *cur<='9'; ++cur) {
unsigned long tmp=l*10ul+*cur-'0';
if ((unsigned int)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 int)];
(void)compileerror;
}
}
|
