int strnatcmp0(nat_char const *a, nat_char const *b, int fold_case)
{
int ai, bi;
nat_char ca, cb;
int fractional, result;
assert(a && b);
ai = bi = 0;
while (1)
{
ca = a[ai]; cb = b[bi];
/* skip over leading spaces or zeros */
while (nat_isspace(ca))
ca = a[++ai];
while (nat_isspace(cb))
cb = b[++bi];
/* process run of digits */
if (nat_isdigit(ca) && nat_isdigit(cb))
{
fractional = (ca == '0' || cb == '0');
if (fractional)
{
if ((result = compare_left(a+ai, b+bi)) != 0)
return result;
}
else
{
if ((result = compare_right(a+ai, b+bi)) != 0)
return result;
}
}
if (!ca && !cb)
{
/* The strings compare the same. Perhaps the caller
will want to call strcmp to break the tie. */
return 0;
}
if (fold_case)
{
ca = nat_toupper(ca);
cb = nat_toupper(cb);
}
if (ca < cb)
return -1;
else if (ca > cb)
return +1;
++ai; ++bi;
}
}
// -----------------------------------------------------------------------------
int strnatcmp0(const nat_char* a, const nat_char* b, bool fold_case)
{
nat_char ca, cb;
int rc = 0;
bool ok = a && b;
int ai = 0, bi = 0;
while( ok && rc == 0 )
{
while( nat_isspace(ca = a[ai]) ) ai++; // skip over leading spaces
while( nat_isspace(cb = b[bi]) ) bi++; // skip over leading spaces
if( nat_isdigit(ca) && nat_isdigit(cb) ) // process run of digits, if any
{
if( ca == '0' || cb == '0' ) // fractional?
{
if( (rc = nat_cmpleft(a+ai, b+bi)) != 0 )
break;
}
else
{
if( (rc = nat_cmprght(a+ai, b+bi)) != 0 )
break;
}
}
if( !ca && !cb ) // do the strings compare the same?
break; // perhaps the caller will want to call strcmp to break the tie
if( fold_case )
{
ca = nat_toupper(ca);
cb = nat_toupper(cb);
}
if( ca < cb ) rc = -1;
else if( ca > cb ) rc = +1;
else { ai++; bi++; }
}
return rc;
}