1 files changed, 39 insertions, 0 deletions
diff --git a/timespectostr.c b/timespectostr.c
new file mode 100644
index 0000000..2e7dd7a
--- /dev/null
+++ b/timespectostr.c
@@ -0,0 +1,39 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+
+
+char *
+libsimple_timespectostr(char *restrict buf, const struct timespec *restrict ts)
+{
+	time_t s = ts->tv_sec;
+	long int ns = ts->tv_nsec;
+	char sign[2] = "+";
+
+	if (!s) {
+		buf = malloc(INTSTRLEN(time_t) + sizeof("-.999999999"));
+		if (!buf)
+			return NULL;
+	}
+
+	if (ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000L) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	if (s == TIME_MIN && !ns) {
+		sprintf(buf, "%lli.000000000", (long long int)s);
+		return buf;
+	}
+
+	if (s < 0) {
+		s = -s;
+		*sign = '-';
+		if (ns) {
+			s -= 1;
+			ns = 1000000000L - ns;
+		}
+	}
+
+	sprintf(buf, "%s%lli.%09li", sign, (long long int)s, ns);
+	return buf;
+}