Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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libowfat/scan/scan_longlong.c

19 lines
432 B

#include "scan.h"
static const unsigned long maxlong = ((unsigned long)-1)>>1;
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;
}