Initial bits of sudoers plugin; still needs work.

plugins/sudoers/error.c

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2004-2005 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <setjmp.h>
+
+#include <config.h>
+#include <compat.h>
+#include "error.h"
+
+static void _warning(int, const char *, va_list);
+       void cleanup(int);
+
+sigjmp_buf error_jmp;
+
+void
+error(int eval, const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	_warning(1, fmt, ap);
+	va_end(ap);
+	cleanup(0);
+	if (error_jmp)
+	    siglongjmp(error_jmp, 1);
+	else
+	    exit(eval);
+}
+
+void
+errorx(int eval, const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	_warning(0, fmt, ap);
+	va_end(ap);
+	cleanup(0);
+	if (error_jmp)
+	    siglongjmp(error_jmp, 1);
+	else
+	    exit(eval);
+}
+
+void
+warning(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	_warning(1, fmt, ap);
+	va_end(ap);
+}
+
+void
+warningx(const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	_warning(0, fmt, ap);
+	va_end(ap);
+}
+
+static void
+_warning(int use_errno, const char *fmt, va_list ap)
+{
+	int serrno = errno;
+
+	fputs(getprogname(), stderr);
+	if (fmt != NULL) {
+		fputs(": ", stderr);
+		vfprintf(stderr, fmt, ap);
+	}
+	if (use_errno) {
+	    fputs(": ", stderr);
+	    fputs(strerror(serrno), stderr);
+	}
+	putc('\n', stderr);
+}