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-rw-r--r--libc/inet/herror.c51
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diff --git a/libc/inet/herror.c b/libc/inet/herror.c
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+/*
+ * Copyright (c) 1987 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>
+#include <string.h>
+#include <netdb.h>
+
+static const char *const 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 */
+};
+static const int h_nerr = { sizeof(h_errlist)/sizeof(h_errlist[0]) };
+
+/*
+ * herror -- print the error indicated by the h_errno value.
+ */
+void herror(const char *s)
+{
+ static const char colon_space[] = ": ";
+ const char *p;
+ const char *c;
+
+ c = colon_space;
+ if (!s || !*s) {
+ c += 2;
+ }
+ p = "Unknown error";
+ if ((h_errno >= 0) && (h_errno < h_nerr)) {
+ p = h_errlist[h_errno];
+ }
+ fprintf(stderr, "%s%s%s\n", s, c, p);
+}