1 files changed, 51 insertions, 0 deletions
diff --git a/libc/inet/herror.c b/libc/inet/herror.c
new file mode 100644
index 000000000..e24d93b3e
--- /dev/null
+++ b/libc/inet/herror.c
@@ -0,0 +1,51 @@
+/*
+ * 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);
+}