Hide errno utility functions

7 files changed, 80 insertions, 43 deletions

diff --git a/src/bump_allocator.c b/src/bump_allocator.c
index f9031b1..924a1c8 100644
--- a/src/bump_allocator.c
+++ b/src/bump_allocator.c
@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: ISC
 
 #include "zix/bump_allocator.h"
+
 #include "zix/allocator.h"
 #include "zix/attributes.h"
 
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;
+}
diff --git a/src/errno_status.h b/src/errno_status.h
new file mode 100644
index 0000000..da26b66
--- /dev/null
+++ b/src/errno_status.h
@@ -0,0 +1,20 @@
+// Copyright 2022 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#ifndef ZIX_ERRNO_STATUS_H
+#define ZIX_ERRNO_STATUS_H
+
+#include "zix/attributes.h"
+#include "zix/common.h"
+
+/// Return an errno value converted to a status code
+ZIX_CONST_FUNC
+ZixStatus
+zix_errno_status(int e);
+
+/// Return success if `r` is non-zero, or `errno` as a status code otherwise
+ZIX_PURE_FUNC
+ZixStatus
+zix_errno_status_if(int r);
+
+#endif // ZIX_ERRNO_STATUS_H
diff --git a/src/ring.c b/src/ring.c
index ca957e2..287639b 100644
--- a/src/ring.c
+++ b/src/ring.c
@@ -2,10 +2,13 @@
 // SPDX-License-Identifier: ISC
 
 #include "zix/ring.h"
-#include "zix/common.h"
 
+#include "errno_status.h"
 #include "zix_config.h"
 
+#include "zix/allocator.h"
+#include "zix/common.h"
+
 #if USE_MLOCK
 #  include <sys/mman.h>
 #elif defined(_WIN32)
@@ -21,6 +24,7 @@
 #  include <intrin.h>
 #endif
 
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
diff --git a/src/sem.c b/src/sem.c
index cb00c3a..8593908 100644
--- a/src/sem.c
+++ b/src/sem.c
@@ -1,10 +1,12 @@
 // Copyright 2012-2022 David Robillard <d@drobilla.net>
 // SPDX-License-Identifier: ISC
 
+#include "zix/sem.h"
+
+#include "errno_status.h"
 #include "zix_config.h"
 
 #include "zix/common.h"
-#include "zix/sem.h"
 
 #ifdef __APPLE__
 #  include <mach/mach.h>
diff --git a/src/status.c b/src/status.c
index e6fbec8..9cdab32 100644
--- a/src/status.c
+++ b/src/status.c
@@ -3,8 +3,6 @@
 
 #include "zix/common.h"
 
-#include <errno.h>
-
 const char*
 zix_strerror(const ZixStatus status)
 {
@@ -36,42 +34,3 @@ zix_strerror(const ZixStatus status)
   }
   return "Unknown error";
 }
-
-ZixStatus
-zix_errno_status_if(const int r)
-{
-  return r ? zix_errno_status(errno) : ZIX_STATUS_SUCCESS;
-}
-
-ZixStatus
-zix_errno_status(const int e)
-{
-  switch (e) {
-  case 0:
-    return ZIX_STATUS_SUCCESS;
-#ifdef EAGAIN
-  case EAGAIN:
-    return ZIX_STATUS_UNAVAILABLE;
-#endif
-#ifdef EEXIST
-  case EEXIST:
-    return ZIX_STATUS_EXISTS;
-#endif
-#ifdef EINVAL
-  case EINVAL:
-    return ZIX_STATUS_BAD_ARG;
-#endif
-#ifdef EPERM
-  case EPERM:
-    return ZIX_STATUS_BAD_PERMS;
-#endif
-#ifdef ETIMEDOUT
-  case ETIMEDOUT:
-    return ZIX_STATUS_TIMEOUT;
-#endif
-  default:
-    break;
-  }
-
-  return ZIX_STATUS_ERROR;
-}
diff --git a/src/thread.c b/src/thread.c
index 72e4d46..c13f2ab 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -2,6 +2,9 @@
 // SPDX-License-Identifier: ISC
 
 #include "zix/thread.h"
+
+#include "errno_status.h"
+
 #include "zix/common.h"
 
 #ifdef _WIN32