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Top Forums Programming help with atoi and macros in C Post 302509118 by DoxieLvr on Wednesday 30th of March 2011 12:43:05 AM
Old 03-30-2011
If you are planning to use that as a TCP port number in sin_port in a sockaddr_in struct, you should be aware that this is a 16-bit unsigned integer and is limited to 65536. In this case, leave it a htons but change the number.
 

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htons(3)						     Library Functions Manual							  htons(3)

NAME
htons - Converts an unsigned short (16-bit) integer from host byte order to network byte order LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <arpa/inet.h> in_port_t htons ( in_port_t hostshort) ; STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: htons(): XNS4.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies a 16-bit integer in host byte order. DESCRIPTION
The htons() (host-to-network short) function converts an unsigned short (16-bit) integer from host byte order to Internet network-byte order. The Internet network requires address and port reference data in network-byte order. Use the htons() function to convert address and port short integers from host byte order to Internet network-byte order. RETURN VALUES
Upon successful completion, the htons() function returns a 16-bit short integer in Internet network-byte order. ERRORS
Current industry standards do not define error values for the htons() function. RELATED INFORMATION
Functions: endhostent(3), endservent(3), htonl(3), ntohl(3), ntohs(3). Standards: standards(5). Network Programmer's Guide delim off htons(3)
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