Add string error handling functions.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@17390 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/hx509/error.c

@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2006 Kungliga Tekniska H<>gskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+#include "hx_locl.h"
+RCSID("$Id$");
+
+struct hx509_error_data {
+    hx509_error next;
+    int code;
+    char *msg;
+};
+
+static void
+free_error_string(hx509_error msg)
+{
+    while(msg) {
+	hx509_error m2 = msg->next;
+	free(msg->msg);
+	free(msg);
+	msg = m2;
+    }
+}
+
+void
+hx509_clear_error_string(hx509_context context)
+{
+    free_error_string(context->error);
+    context->error = NULL;
+}
+
+void
+hx509_set_error_stringv(hx509_context context, int flags, int code, 
+			const char *fmt, va_list ap)
+{
+    hx509_error msg;
+
+    msg = calloc(1, sizeof(*msg));
+    if (msg == NULL)
+	return;
+
+    if (vasprintf(&msg->msg, fmt, ap) == -1) {
+	free(msg);
+	return;
+    }
+    msg->code = code;
+
+    if (flags & HX509_ERROR_APPEND) {
+	msg->next = context->error;
+	context->error = msg;
+    } else  {
+	free_error_string(context->error);
+	context->error = msg;
+    }
+}
+
+void
+hx509_set_error_string(hx509_context context, int flags, int code, const char *fmt, ...)
+{
+    va_list ap;
+
+    va_start(ap, fmt);
+    hx509_set_error_stringv(context, flags, code, fmt, ap);
+    va_end(ap);
+}
+
+char *
+hx509_get_error_string(hx509_context context, int error_code)
+{
+    struct rk_strpool *p = NULL;
+    hx509_error msg;
+
+    if (context->error == NULL) {
+	const char *cstr;
+	char *str;
+
+	cstr = com_right(context->et_list, error_code);
+	if (cstr)
+	    return strdup(cstr);
+	cstr = strerror(error_code);
+	if (cstr)
+	    return strdup(cstr);
+	if (asprintf(&str, "<unknown error: %d>", error_code) == -1)
+	    return NULL;
+	return str;
+    }
+
+    for (msg = context->error; msg; msg = msg->next)
+	p = rk_strpoolprintf(p, "%s", msg->msg);
+
+    return rk_strpoolcollect(p);
+}
+
+void
+hx509_err(hx509_context context, int exit_code, int error_code, char *fmt, ...)
+{
+    va_list ap;
+    char *msg, *str;
+
+    va_start(ap, fmt);
+    vasprintf(&str, fmt, ap);
+    va_end(ap);
+    msg = hx509_get_error_string(context, error_code);
+    if (msg == NULL)
+	msg = "no error";
+
+    errx(exit_code, "%s: %s", str, msg);
+}