1 files changed, 80 insertions, 0 deletions
diff --git a/util/err.c b/util/err.c
new file mode 100644
index 0000000..1f3fb6d
--- /dev/null
+++ b/util/err.c
@@ -0,0 +1,80 @@
+#include "util.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+
+#define FORMAT_MAX_SIZE 1024
+
+extern int errno;
+
+void NORETURN die(char const * format, ...) {
+	va_list vargs;
+	va_start (vargs, format);
+
+	vfprintf(stderr, format, vargs);
+	fprintf(stderr, "\n");
+
+	va_end(vargs);
+	exit(1);
+}
+
+void err(char const * format, ...) {
+	va_list vargs;
+	va_start (vargs, format);
+
+	vfprintf(stderr, format, vargs);
+	fprintf(stderr, "\n");
+
+	va_end(vargs);
+}
+
+void format_with_errno(char * buf, size_t n, char const * format) {
+	char const * errstr = strerror(errno);
+	char fmt_err[256];
+
+	size_t i = 0,
+		   j = 0;
+	while(errstr[j] && i < sizeof(fmt_err) - 1) {
+		if((fmt_err[i++] = errstr[j++]) != '%')
+			continue;
+
+		if(i < sizeof(fmt_err) - 1) {
+			fmt_err[i++] = '%';
+		} else {
+			i--;
+		}
+	}
+
+	fmt_err[i] = '\0';
+
+	snprintf(buf, n, "%s: %s", format, fmt_err);
+}
+
+
+void NORETURN die_errno(char const * format, ...) {
+	va_list vargs;
+	va_start (vargs, format);
+
+	char buf[FORMAT_MAX_SIZE];
+	format_with_errno(buf, sizeof(buf), format);
+	vfprintf(stderr, buf, vargs);
+	fprintf(stderr, "\n");
+	exit(1);
+
+	va_end(vargs);
+}
+
+void err_errno(char const * format, ...) {
+	va_list vargs;
+	va_start (vargs, format);
+
+	char buf[FORMAT_MAX_SIZE];
+
+	format_with_errno(buf, sizeof(buf), format);
+	vfprintf(stderr, buf, vargs);
+	fprintf(stderr, "\n");
+	
+	va_end(vargs);
+}