Hide errno utility functions

1 files changed, 48 insertions, 0 deletions

diff --git a/src/errno_status.c b/src/errno_status.c
new file mode 100644
index 0000000..1830234
--- /dev/null
+++ b/src/errno_status.c
@@ -0,0 +1,48 @@
+// Copyright 2014-2022 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#include "errno_status.h"
+
+#include "zix/common.h"
+
+#include <errno.h>
+#include <stddef.h>
+
+ZixStatus
+zix_errno_status_if(const int r)
+{
+  return r ? zix_errno_status(errno) : ZIX_STATUS_SUCCESS;
+}
+
+ZixStatus
+zix_errno_status(const int e)
+{
+  typedef struct {
+    int       code;
+    ZixStatus status;
+  } Mapping;
+
+  static const Mapping map[] = {
+    {0, ZIX_STATUS_SUCCESS},
+    {EACCES, ZIX_STATUS_BAD_PERMS},
+    {EAGAIN, ZIX_STATUS_UNAVAILABLE},
+    {EEXIST, ZIX_STATUS_EXISTS},
+    {EINVAL, ZIX_STATUS_BAD_ARG},
+    {ENOENT, ZIX_STATUS_NOT_FOUND},
+    {ENOMEM, ZIX_STATUS_NO_MEM},
+    {ENOSYS, ZIX_STATUS_NOT_SUPPORTED},
+    {EPERM, ZIX_STATUS_BAD_PERMS},
+    {ETIMEDOUT, ZIX_STATUS_TIMEOUT},
+    {0, ZIX_STATUS_ERROR}, // Fallback mapping
+  };
+
+  static const size_t n_mappings = sizeof(map) / sizeof(Mapping);
+
+  // Find the index of the matching mapping (or leave it at the fallback entry)
+  size_t m = 0;
+  while (m < n_mappings && map[m].code != e) {
+    ++m;
+  }
+
+  return map[m].status;
+}