1 files changed, 144 insertions, 0 deletions
diff --git a/libdimension/base/error.c b/libdimension/base/error.c
new file mode 100644
index 0000000..6b8d18e
--- /dev/null
+++ b/libdimension/base/error.c
@@ -0,0 +1,144 @@
+/*************************************************************************
+ * Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com>     *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library is distributed in the hope that it will be      *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Error handling.
+ */
+
+#include "internal.h"
+#include "internal/platform.h"
+#include <errno.h>
+#include <pthread.h>
+#include <stdatomic.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/// Report internal errors in this file.
+#define DMNSN_LOCAL_ERROR(str)                          \
+  do {                                                  \
+    fprintf(stderr, "Dimension ERROR: %s, %s:%u: %s\n", \
+            DMNSN_FUNC, __FILE__, __LINE__, (str));     \
+    abort();                                            \
+  } while (0)
+
+/// The default fatal error handler.
+static void dmnsn_default_fatal_error_fn(void);
+
+/// The current fatal error handler.
+static atomic(dmnsn_fatal_error_fn *) dmnsn_fatal = ATOMIC_VAR_INIT(dmnsn_default_fatal_error_fn);
+
+/// The current resilience.
+static atomic_bool dmnsn_always_die = ATOMIC_VAR_INIT(false);
+
+void
+dmnsn_report_impl(bool die, const char *func, const char *file, unsigned int line, const char *str)
+{
+  // Save the value of errno
+  int err = errno;
+
+  bool always_die = atomic_load(&dmnsn_always_die);
+
+  // Print the diagnostic string
+  fprintf(stderr, "Dimension %s: %s, %s:%u: %s\n",
+          die ? "ERROR" : "WARNING", func, file, line, str);
+
+  // Print the value of errno
+  if (err != 0) {
+    fprintf(stderr, "Last error: %d", err);
+#if DMNSN_STRERROR_R
+    char errbuf[256];
+    if (strerror_r(err, errbuf, 256) == 0) {
+      fprintf(stderr, " (%s)", errbuf);
+    }
+#elif DMNSN_SYS_ERRLIST
+    if (err >= 0 && err < sys_nerr) {
+      fprintf(stderr, " (%s)", sys_errlist[err]);
+    }
+#endif
+    fprintf(stderr, "\n");
+  }
+
+  // Print a stack trace to standard error
+  dmnsn_backtrace(stderr);
+
+  // Call the fatal error handler if needed
+  if (die || always_die) {
+    static __thread bool thread_exiting = false;
+
+    if (thread_exiting) {
+      if (die) {
+        // Prevent infinite recursion if the fatal error function itself calls
+        // dmnsn_error() (not dmnsn_warning())
+        DMNSN_LOCAL_ERROR("Error raised while in error handler, aborting.");
+      }
+    } else {
+      thread_exiting = true;
+
+      dmnsn_fatal_error_fn *fatal = dmnsn_get_fatal_error_fn();
+      fatal();
+      DMNSN_LOCAL_ERROR("Fatal error handler didn't exit.");
+    }
+  }
+}
+
+void
+dmnsn_report_warning(const char *func, const char *file, unsigned int line, const char *str)
+{
+  dmnsn_report_impl(false, func, file, line, str);
+}
+
+DMNSN_NORETURN
+dmnsn_report_error(const char *func, const char *file, unsigned int line, const char *str)
+{
+  dmnsn_report_impl(true, func, file, line, str);
+  DMNSN_UNREACHABLE();
+}
+
+void
+dmnsn_die_on_warnings(bool always_die)
+{
+  atomic_store(&dmnsn_always_die, always_die);
+}
+
+dmnsn_fatal_error_fn *
+dmnsn_get_fatal_error_fn(void)
+{
+  dmnsn_fatal_error_fn *fatal = atomic_load(&dmnsn_fatal);
+  return fatal;
+}
+
+void
+dmnsn_set_fatal_error_fn(dmnsn_fatal_error_fn *fatal)
+{
+  atomic_store(&dmnsn_fatal, fatal);
+}
+
+static void
+dmnsn_default_fatal_error_fn(void)
+{
+  if (dmnsn_is_main_thread()) {
+    exit(EXIT_FAILURE);
+  } else {
+    pthread_exit(NULL);
+  }
+}