ns_ntoa(3POSIX)

NAME | SYNOPSIS | API RESTRICTIONS | DESCRIPTION | RETURN VALUES | ATTRIBUTES | SEE ALSO | BUGS

NAME

ns_addr, ns_ntoa- Xerox NS address conversion routines

SYNOPSIS

$(OS_DIR)/lib/libc.a
#include <sys/types.h>
#include <netns/ns.h>

struct ns_addr ns_addr(char * cp);
char *ns_ntoa(struct ns_addr ns);

API RESTRICTIONS

The function or functions documented here may not be used safely in all application contexts with all APIs provided in the ChorusOS 5.0 product.

See API(5FEA) for details.

DESCRIPTION

The ns_addr() routine interprets character strings representing XNS addresses, returning binary information suitable for use in system calls. The ns_ntoa() routine takes XNS addresses and returns ASCII strings representing the address in a notation in common use in the Xerox Development Environment:

<network number>.<host number>.<port number>

Trailing zero fields are suppressed and each number is printed in hexadecimal, in a format suitable for input to ns_addr() . Any fields lacking super-decimal digits will have a trailing H appended.

There is no universal standard for representing XNS addresses. An effort has been made to ensure that ns_addr() is compatible with most formats in common use. It will first separate an address into 1 to 3 fields using a single delimiter which is either dot (".") , colon (":") or pound-sign ("#") . Each field is then examined for byte separators (colon or dot). If there are byte separators, each subfield separated is taken to be a small hexadecimal number, and the entirety is taken as a network-byte-ordered quantity to be zero extended in the high-network-order bytes. Next, the field is inspected for hyphens, in which case the field is assumed to be a number in decimal notation with hyphens separating the millenia. Next, the field is assumed to be a number. It is interpreted as hexadecimal if there is a leading 0x (as in C), a trailing H (as in Mesa), or if there are any super-decimal digits present. It is interpreted as octal if there is a leading 0 and there are no super-octal digits. Otherwise, it is converted to a decimal number.

RETURN VALUES

None.

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Evolving

SEE ALSO

hosts(4CC) , networks(4CC)

BUGS

The string returned by ns_ntoa() resides in a static memory area. The function ns_addr() should diagnose improperly formed input, and there should be an unambiguous way to recognize this.

NAME | SYNOPSIS | API RESTRICTIONS | DESCRIPTION | RETURN VALUES | ATTRIBUTES | SEE ALSO | BUGS