1 files changed, 123 insertions, 0 deletions
diff --git a/src/util/support/errors.c b/src/util/support/errors.c
new file mode 100644
index 0000000000000..70e1d59d095b4
--- /dev/null
+++ b/src/util/support/errors.c
@@ -0,0 +1,123 @@
+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/*
+ * Can't include krb5.h here, or k5-int.h which includes it, because krb5.h
+ * needs to be generated with error tables, after util/et, which builds after
+ * this directory.
+ */
+#include "k5-platform.h"
+#include "k5-err.h"
+#include "k5-thread.h"
+#include "supp-int.h"
+
+/*
+ * It would be nice to just use error_message() always.  Pity that it's defined
+ * in a library that depends on this one, and we're not allowed to make
+ * circular dependencies.
+ */
+/*
+ * We really want a rwlock here, since we should hold it while calling the
+ * function and copying out its results.  But I haven't implemented shims for
+ * rwlock yet.
+ */
+static k5_mutex_t krb5int_error_info_support_mutex =
+    K5_MUTEX_PARTIAL_INITIALIZER;
+static const char *(KRB5_CALLCONV *fptr)(long); /* = &error_message */
+
+/* Fallback error message if we cannot allocate a copy of the real one. */
+static char *oom_msg = "Out of memory";
+
+int
+krb5int_err_init (void)
+{
+    return k5_mutex_finish_init(&krb5int_error_info_support_mutex);
+}
+#define initialize()    krb5int_call_thread_support_init()
+#define lock()          k5_mutex_lock(&krb5int_error_info_support_mutex)
+#define unlock()        k5_mutex_unlock(&krb5int_error_info_support_mutex)
+
+void
+k5_set_error(struct errinfo *ep, long code, const char *fmt, ...)
+{
+    va_list args;
+
+    va_start(args, fmt);
+    k5_vset_error(ep, code, fmt, args);
+    va_end(args);
+}
+
+void
+k5_vset_error(struct errinfo *ep, long code, const char *fmt, va_list args)
+{
+    char *str;
+
+    k5_clear_error(ep);
+    ep->code = code;
+
+    if (vasprintf(&str, fmt, args) < 0)
+        return;
+    ep->msg = str;
+}
+
+static inline const char *
+oom_check(const char *str)
+{
+    return (str == NULL) ? oom_msg : str;
+}
+
+const char *
+k5_get_error(struct errinfo *ep, long code)
+{
+    const char *r;
+    char buf[128];
+
+    if (code == ep->code && ep->msg != NULL)
+        return oom_check(strdup(ep->msg));
+
+    if (initialize())
+        return oom_check(strdup(_("Kerberos library initialization failure")));
+
+    lock();
+    if (fptr == NULL) {
+        unlock();
+        if (strerror_r(code, buf, sizeof(buf)) == 0)
+            return oom_check(strdup(buf));
+        return oom_check(strdup(strerror(code)));
+    }
+    r = fptr(code);
+#ifndef HAVE_COM_ERR_INTL
+    /* Translate com_err results here if libcom_err won't do it. */
+    r = _(r);
+#endif
+    if (r == NULL) {
+        unlock();
+        snprintf(buf, sizeof(buf), _("error %ld"), code);
+        return oom_check(strdup(buf));
+    }
+
+    r = strdup(r);
+    unlock();
+    return oom_check(r);
+}
+
+void
+k5_free_error(struct errinfo *ep, const char *msg)
+{
+    if (msg != oom_msg)
+        free((char *)msg);
+}
+
+void
+k5_clear_error(struct errinfo *ep)
+{
+    k5_free_error(ep, ep->msg);
+    ep->msg = NULL;
+}
+
+void
+k5_set_error_info_callout_fn(const char *(KRB5_CALLCONV *f)(long))
+{
+    initialize();
+    lock();
+    fptr = f;
+    unlock();
+}