Add support for parsing NaN, INF, and -INF

1 files changed, 14 insertions, 4 deletions

diff --git a/src/string.c b/src/string.c
index 7229d6b2..d5899751 100644
--- a/src/string.c
+++ b/src/string.c
@@ -105,6 +105,19 @@ serd_strtod(const char* str, size_t* end)
 {
 	double result = 0.0;
 
+#define SET_END(index) if (end) { *end = index; }
+
+	if (!strcmp(str, "NaN")) {
+		SET_END(3);
+		return NAN;
+	} else if (!strcmp(str, "-INF")) {
+		SET_END(4);
+		return -INFINITY;
+	} else if (!strcmp(str, "INF")) {
+		SET_END(3);
+		return INFINITY;
+	}
+
 	// Point s at the first non-whitespace character
 	const char* s = str;
 	while (is_space(*s)) { ++s; }
@@ -137,10 +150,7 @@ serd_strtod(const char* str, size_t* end)
 		result *= pow(10, expt * expt_sign);
 	}
 
-	if (end) {
-		*end = s - str;
-	}
-
+	SET_END(s - str);
 	return result * sign;
 }