1 files changed, 125 insertions, 0 deletions
diff --git a/roms/ipxe/src/hci/strerror.c b/roms/ipxe/src/hci/strerror.c
new file mode 100644
index 00000000..9356e9e0
--- /dev/null
+++ b/roms/ipxe/src/hci/strerror.c
@@ -0,0 +1,125 @@
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <ipxe/errortab.h>
+
+/** @file
+ *
+ * Error descriptions.
+ *
+ * The error numbers used by Etherboot are a superset of those defined
+ * by the PXE specification version 2.1.  See errno.h for a listing of
+ * the error values.
+ *
+ * To save space in ROM images, error string tables are optional.  Use
+ * the ERRORMSG_XXX options in config.h to select which error string
+ * tables you want to include.  If an error string table is omitted,
+ * strerror() will simply return the text "Error 0x<errno>".
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/**
+ * Find error description
+ *
+ * @v errno		Error number
+ * @ret errortab	Error description, or NULL
+ */
+static struct errortab * find_error ( int errno ) {
+	struct errortab *errortab;
+
+	for_each_table_entry ( errortab, ERRORTAB ) {
+		if ( errortab->errno == errno )
+			return errortab;
+	}
+
+	return NULL;
+}
+
+/**
+ * Find closest error description
+ *
+ * @v errno		Error number
+ * @ret errortab	Error description, or NULL
+ *
+ * 
+ */
+static struct errortab * find_closest_error ( int errno ) {
+	struct errortab *errortab;
+
+	/* First, look for an exact match */
+	if ( ( errortab = find_error ( errno ) ) != NULL )
+		return errortab;
+
+	/* Second, try masking off the iPXE-specific bit and seeing if
+	 * we have an entry for the generic POSIX error message.
+	 */
+	if ( ( errortab = find_error ( errno & 0x7f0000ff ) ) != NULL )
+		return errortab;
+
+	return NULL;
+}
+
+/**
+ * Retrieve string representation of error number.
+ *
+ * @v errno/rc		Error number or return status code
+ * @ret strerror	Pointer to error text
+ *
+ * If the error is not found in the linked-in error tables, generates
+ * a generic "Error 0x<errno>" message.
+ *
+ * The pointer returned by strerror() is valid only until the next
+ * call to strerror().
+ *
+ */
+const char * strerror ( int errno ) {
+	static char errbuf[64];
+	struct errortab *errortab;
+
+	/* Allow for strerror(rc) as well as strerror(errno) */
+	if ( errno < 0 )
+		errno = -errno;
+
+	/* Find the error description, if one exists */
+	errortab = find_closest_error ( errno );
+
+	/* Construct the error message */
+	if ( errortab ) {
+		snprintf ( errbuf, sizeof ( errbuf ),
+			   "%s (http://ipxe.org/%08x)",
+			   errortab->text, errno );
+	} else {
+		snprintf ( errbuf, sizeof ( errbuf ),
+			   "Error %#08x (http://ipxe.org/%08x)",
+			   errno, errno );
+	}
+
+	return errbuf;
+}
+
+/* Do not include ERRFILE portion in the numbers in the error table */
+#undef ERRFILE
+#define ERRFILE 0
+
+/** The most common errors */
+struct errortab common_errors[] __errortab = {
+	__einfo_errortab ( EINFO_ENOERR ),
+	__einfo_errortab ( EINFO_EACCES ),
+	__einfo_errortab ( EINFO_ECANCELED ),
+	__einfo_errortab ( EINFO_ECONNRESET ),
+	__einfo_errortab ( EINFO_EINVAL ),
+	__einfo_errortab ( EINFO_EIO ),
+	__einfo_errortab ( EINFO_ENETUNREACH ),
+	__einfo_errortab ( EINFO_ENODEV ),
+	__einfo_errortab ( EINFO_ENOENT ),
+	__einfo_errortab ( EINFO_ENOEXEC ),
+	__einfo_errortab ( EINFO_ENOMEM ),
+	__einfo_errortab ( EINFO_ENOSPC ),
+	__einfo_errortab ( EINFO_ENOTCONN ),
+	__einfo_errortab ( EINFO_ENOTSUP ),
+	__einfo_errortab ( EINFO_EPERM ),
+	__einfo_errortab ( EINFO_ERANGE ),
+	__einfo_errortab ( EINFO_ETIMEDOUT ),
+};