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#include "scan.h"
size_t scan_longn(const char *src,size_t n,long *dest) {
register const char *tmp;
register long int l;
register unsigned char c;
int neg;
int ok;
if (!n--) return 0;
tmp=src; l=0; ok=neg=0;
switch (*tmp) {
case '-': neg=1;
case '+': ++tmp;
while (n-->0 && (c=*tmp-'0')<10) {
if (!ok) return 0;
return tmp-src;