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#include "scan.h"
static const unsigned long maxlong = ((unsigned long)-1)>>1;
#ifdef UNITTEST
#undef UNITTEST
#include "scan_ulonglong.c"
#define UNITTEST
#endif
size_t scan_longlong(const char* src,signed long long* dest) {
size_t i,o;
unsigned long long l;
char c=src[0];
unsigned int neg=c=='-';
o=c=='-' || c=='+';
if ((i=scan_ulonglong(src+o,&l))) {
if (i>0 && l>maxlong+neg) {
l/=10;
--i;
}
if (i+o) *dest=(signed long long)(c=='-'?-l:l);
return i+o;
} return 0;
}
#ifdef UNITTEST
#include <assert.h>
int main() {
long long i;
assert(scan_longlong("1234",&i)==4 && i==1234);
assert(scan_longlong("-1234",&i)==5 && i==-1234);
assert(scan_longlong("+1234",&i)==5 && i==1234);
assert(scan_longlong("2147483647",&i)==10 && i==2147483647); // INT_MAX
assert(scan_longlong("-2147483648",&i)==11 && i==-2147483648); // INT_MIN
assert(scan_longlong("9223372036854775807",&i)==19 && i==0x7fffffffffffffffull); // LONG_MAX
assert(scan_longlong("-9223372036854775808",&i)==20 && i==(long long)0x8000000000000000ull); // LONG_MIN
return 0;
}
#endif
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