herror.c

来自「Linux下的socks的程序源程序,用于socks的代理服务」· C语言 代码 · 共 53 行

/*
 * Copyright (c) 1988, 1990 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * Neither the name of the University nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include <stdio.h>

char	*h_errlist[] = {
	"Error 0",
	"Unknown host",				/* 1 HOST_NOT_FOUND */
	"Host name lookup failure",		/* 2 TRY_AGAIN */
	"Unknown server error",			/* 3 NO_RECOVERY */
	"No address associated with name",	/* 4 NO_ADDRESS */
};
int	h_nerr = { sizeof(h_errlist)/sizeof(h_errlist[0]) };

int h_errno;		/* In some version of SunOS this is necessary */

/*
 * herror --
 *	print the error indicated by the h_errno value.
 */
herror(s)
	char *s;
{
	if (s && *s) {
		fprintf(stderr, "%s: ", s);
	}
	if ((h_errno < 0) || (h_errno >= h_nerr)) {
		fprintf(stderr, "Unknown error\n");
	} else if (h_errno == 0) {
#if	defined(sun)
		fprintf(stderr, "Host unknown\n");
#endif	/* defined(sun) */
	} else {
		fprintf(stderr, "%s\n", h_errlist[h_errno]);
	}
}