1 files changed, 33 insertions, 0 deletions
diff --git a/usr/klibc/strerror.c b/usr/klibc/strerror.c
new file mode 100644
index 0000000..fed0e49
--- /dev/null
+++ b/usr/klibc/strerror.c
@@ -0,0 +1,33 @@
+/*
+ * strerror.c
+ */
+
+#include <string.h>
+
+char *strerror(int errnum)
+{
+	static char message[32] = "error ";	/* enough for error 2^63-1 */
+	char numbuf[32];
+	char *p;
+	unsigned int e = (unsigned int)errnum;
+
+#ifdef WITH_ERRLIST
+	extern const int sys_nerr;
+	extern const char *const sys_errlist[];
+
+	if (e < (unsigned int)sys_nerr && sys_errlist[e])
+		return (char *)sys_errlist[e];
+#endif
+
+	p = numbuf + sizeof numbuf;
+	*--p = '\0';
+
+	do {
+		*--p = (e % 10) + '0';
+		e /= 10;
+	} while (e);
+
+	memcpy(message + 6, p, (numbuf + sizeof numbuf) - p);
+
+	return message;
+}