1 files changed, 55 insertions, 0 deletions
diff --git a/src/error.c b/src/error.c
new file mode 100644
index 0000000..106ca8c
--- /dev/null
+++ b/src/error.c
@@ -0,0 +1,55 @@
+#include "error.h"
+
+#include <stdarg.h>
+
+
+enum control { get, set };
+
+static struct magi_error * errorctl(
+    enum control command, struct magi_error_message * err)
+{
+    static struct magi_error * error = 0;
+    if (command == set) {
+        error = err;
+    }
+    return error;
+}
+
+
+struct magi_error * magi_error_get()
+{
+    return errorctl(get, 0);
+}
+
+void magi_error_set(char * format, ...)
+{
+    for (;;) {
+        Create(len);
+        /* Try to print in the allocated space. */
+        va_list ap;
+        va_start(ap, format);
+        int n = vsnprintf(p->buf, len, format, ap);
+        va_end(ap);
+        /* If that worked, we're done */
+        if (n > -1 && n < len)
+            break;
+        /* Else try again with more space. */
+        if (n > -1)      /* glibc 2.1 */
+            len = n + 1; /* precisely what is needed */
+        else             /* glibc 2.0 */
+            len *= 2;    /* twice the old size */
+    }
+    errorctl();
+}
+
+void magi_error_rid()
+{
+    struct magi_error * error = errorctl(get, 0);
+    if (error) {
+        if (error->message) {
+            free(error->message);
+        }
+        free(error);
+        errorctl(set, 0);
+    }
+}