1 files changed, 99 insertions, 0 deletions
diff --git a/lib/libc/string/strerror.c b/lib/libc/string/strerror.c
new file mode 100644
index 0000000..02fba0c
--- /dev/null
+++ b/lib/libc/string/strerror.c
@@ -0,0 +1,99 @@
+/*-
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)strerror.c	8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#define	UPREFIX		"Unknown error: "
+
+/*
+ * Define a buffer size big enough to describe a 64-bit signed integer
+ * converted to ASCII decimal (19 bytes), with an optional leading sign
+ * (1 byte); finally, we get the prefix and a trailing NUL from UPREFIX.
+ */
+#define	EBUFSIZE	(20 + sizeof(UPREFIX))
+
+/*
+ * Doing this by hand instead of linking with stdio(3) avoids bloat for
+ * statically linked binaries.
+ */
+static void
+errstr(int num, char *buf, size_t len)
+{
+	char *t;
+	unsigned int uerr;
+	char tmp[EBUFSIZE];
+
+	t = tmp + sizeof(tmp);
+	*--t = '\0';
+	uerr = (num >= 0) ? num : -num;
+	do {
+		*--t = "0123456789"[uerr % 10];
+	} while (uerr /= 10);
+	if (num < 0)
+		*--t = '-';
+	strlcpy(buf, UPREFIX, len);
+	strlcat(buf, t, len);
+}
+
+int
+strerror_r(int errnum, char *strerrbuf, size_t buflen)
+{
+
+	if (errnum < 1 || errnum >= sys_nerr) {
+		errstr(errnum, strerrbuf, buflen);
+		return (EINVAL);
+	}
+	if (strlcpy(strerrbuf, sys_errlist[errnum], buflen) >= buflen)
+		return (ERANGE);
+	return (0);
+}
+
+char *
+strerror(int num)
+{
+	static char ebuf[EBUFSIZE];
+
+	if (num > 0 && num < sys_nerr)
+		return ((char *)sys_errlist[num]);
+	errno = EINVAL;
+	errstr(num, ebuf, sizeof(ebuf));
+	return (ebuf);
+}