2 files changed, 56 insertions, 1 deletions
diff --git a/kern/error.c b/kern/error.c
new file mode 100644
index 0000000..3e50149
--- /dev/null
+++ b/kern/error.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 Richard Braun.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <kern/error.h>
+#include <kern/panic.h>
+
+void
+error_check(int error, const char *prefix)
+{
+    const char *msg;
+
+    switch (error) {
+    case 0:
+        return;
+    case ERROR_NOMEM:
+        msg = "out of memory";
+        break;
+    case ERROR_AGAIN:
+        msg = "resource temporarily unavailable";
+        break;
+    case ERROR_INVAL:
+        msg = "invalid argument";
+        break;
+    case ERROR_BUSY:
+        msg = "device or resource busy";
+        break;
+    default:
+        msg = "unknown error";
+    }
+
+    panic("%s%s%s",
+          (prefix == NULL) ? "" : prefix,
+          (prefix == NULL) ? "" : ": ",
+          msg);
+}
diff --git a/kern/error.h b/kern/error.h
index bdb6bda..0d8bf73 100644
--- a/kern/error.h
+++ b/kern/error.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2013 Richard Braun.
+ * Copyright (c) 2012-2014 Richard Braun.
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -23,4 +23,10 @@
 #define ERROR_INVAL 3
 #define ERROR_BUSY  4
 
+/*
+ * If error denotes an actual error (i.e. is not 0), panic, using the given
+ * string as a prefix for the error message. A NULL prefix is allowed.
+ */
+void error_check(int error, const char *prefix);
+
 #endif /* _KERN_ERROR_H */