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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2009 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
#include <ast.h>
#include <ctype.h>
/*
* version strncmp(3)
*/
int
strnvcmp(register const char* a, register const char* b, size_t n)
{
register const char* ae;
register const char* be;
register unsigned long na;
register unsigned long nb;
ae = a + n;
be = b + n;
for (;;)
{
if (a >= ae)
{
if (b >= be)
return 0;
return 1;
}
else if (b >= be)
return -1;
if (isdigit(*a) && isdigit(*b))
{
na = nb = 0;
while (a < ae && isdigit(*a))
na = na * 10 + *a++ - '0';
while (b < be && isdigit(*b))
nb = nb * 10 + *b++ - '0';
if (na < nb)
return -1;
if (na > nb)
return 1;
}
else if (*a != *b)
break;
else if (!*a)
return 0;
else
{
a++;
b++;
}
}
if (*a == 0)
return -1;
if (*b == 0)
return 1;
if (*a == '.')
return -1;
if (*b == '.')
return 1;
if (*a == '-')
return -1;
if (*b == '-')
return 1;
return *a < *b ? -1 : 1;
}
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