1 files changed, 99 insertions, 0 deletions
diff --git a/log.c b/log.c
new file mode 100644
index 0000000..39730bf
--- /dev/null
+++ b/log.c
@@ -0,0 +1,99 @@
+/*  log.c  --  Error and warning messages.
+ *
+ * Copyright (C) 2016 Tomasz Kramkowski <tk@the-tk.com>
+ *
+ *  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 2 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, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "log.h"
+
+const char *argv0;
+
+void error(int errnum, const char *fmt, ...)
+{
+	assert(fmt);
+
+	va_list va;
+
+	fprintf(stderr, "%s: error: ", argv0);
+
+	va_start(va, fmt);
+	vfprintf(stderr, fmt, va);
+	va_end(va);
+
+	if (errnum)
+		fprintf(stderr, ": %s", strerror(errnum));
+
+	fputc('\n', stderr);
+
+	exit(EXIT_FAILURE);
+}
+
+void errorat(int errnum, const char *file, long line, const char *fmt, ...)
+{
+	assert(file && fmt);
+
+	va_list va;
+
+	fprintf(stderr, "%s:%s:%ld: error: ", argv0, file, line);
+
+	va_start(va, fmt);
+	vfprintf(stderr, fmt, va);
+	va_end(va);
+
+	if (errnum)
+		fprintf(stderr, ": %s", strerror(errnum));
+
+	fputc('\n', stderr);
+
+	exit(EXIT_FAILURE);
+}
+
+void warning(int errnum, const char *fmt, ...)
+{
+	va_list ap;
+
+	fprintf(stderr, "%s: warning: ", argv0);
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+
+	if (errnum)
+		fprintf(stderr, ": %s", strerror(errnum));
+
+	fputc('\n', stderr);
+}
+
+void warningat(int errnum, const char *file, long line, const char *fmt, ...)
+{
+	va_list ap;
+
+	fprintf(stderr, "%s:%s:%ld: warning: ", argv0, file, line);
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+
+	if (errnum)
+		fprintf(stderr, ": %s", strerror(errnum));
+
+	fputc('\n', stderr);
+}