1 files changed, 95 insertions, 0 deletions
diff --git a/libgloss/m68k/atari/atari-gem_errno.c b/libgloss/m68k/atari/atari-gem_errno.c
new file mode 100644
index 0000000..641a0b2
--- /dev/null
+++ b/libgloss/m68k/atari/atari-gem_errno.c
@@ -0,0 +1,95 @@
+/*
+	Copyright (C) 2025 Mikael Hildenborg
+	SPDX-License-Identifier: BSD-2-Clause
+*/
+
+#include <errno.h>
+#include "atari-gem_errno.h"
+#include <_ansi.h>
+
+/*
+	The conversion between gem errors and errno is not a one to one match,
+	so the goal has been to try and report errors to errno in such way that
+	code depending on this will run as expected.
+	This remains to be proven correct.
+*/
+void gem_error_to_errno(int gem_error)
+{
+	errno = ENOSYS; // Use this as default error code.
+	switch (gem_error)
+	{
+	case GEM_EDRVNR:
+	case GEM_EMEDIA:
+	case GEM_EPAPER:
+		errno = EIO;
+		break;
+	case GEM_EBADRQ:
+		errno = EINVAL;
+		break;
+	case GEM_E_SEEK:
+		errno = ESPIPE;
+		break;
+	case GEM_ESECNF:
+	case GEM_EWRITF:
+	case GEM_EREADF:
+		errno = EIO;
+		break;
+	case GEM_EWRPRO:
+		errno = EROFS;
+		break;
+	case GEM_EUNDEV:
+	case GEM_EDRIVE:
+		errno = ENODEV;
+		break;
+	case GEM_EFILNF:
+	case GEM_EPTHNF:
+	case GEM_EMOUNT:
+		errno = ENOENT;
+		break;
+	case GEM_ENHNDL:
+	case GEM_ENMFIL:
+		errno = EMFILE;
+		break;
+	case GEM_EACCDN:
+		errno = EACCES;
+		break;
+	case GEM_EIHNDL:
+		errno = EBADF;
+		break;
+	case GEM_ENSMEM:
+	case GEM_EGSBF:
+		errno = ENOMEM;
+		break;
+	case GEM_EIMBA:
+		errno = EADDRNOTAVAIL;
+		break;
+	case GEM_ENSAME:
+		errno = EXDEV;
+		break;
+	case GEM_ELOCKED:
+	case GEM_ENSLOCK:
+		errno = ENOLCK;
+		break;
+	case GEM_ENAMETOOLONG:
+		errno = ENAMETOOLONG;
+		break;
+	case GEM_EPLFMT:
+		errno = ENOEXEC;
+		break;
+	case GEM_ELOOP:
+		errno = EMLINK;
+		break;
+	case GEM_E_OK:
+	case GEM_ERROR:
+	case GEM_EUNCMD:
+	case GEM_E_CRC:
+	case GEM_E_CHNG:
+	case GEM_EBADSF:
+	case GEM_EOTHER:
+	case GEM_EINVFN:
+	case GEM_EINTRN:
+	default:
+		errno = -gem_error;
+		break;
+	}
+}