X-Git-Url: http://sigrok.org/gitweb/?a=blobdiff_plain;ds=inline;f=src%2Fstrutil.c;h=68a9004e609339de53560dc7fb29c0605e51c465;hb=41c47f2c6ac4cb7531588bd38c55af2484523385;hp=fd9a438e647a6210e63091050b78c7790ffe97be;hpb=f05600f4be54c7f112815cc1624600517243898e;p=libsigrok.git

diff --git a/src/strutil.c b/src/strutil.c
index fd9a438e..68a9004e 100644
--- a/src/strutil.c
+++ b/src/strutil.c
@@ -233,13 +233,19 @@ SR_API int sr_parse_rational(const char *str, struct sr_rational *ret)
 	int64_t denominator = 1;
 	int32_t fractional_len = 0;
 	int32_t exponent = 0;
+	int is_negative = 0;
 
 	errno = 0;
 	integral = g_ascii_strtoll(str, &endptr, 10);
 
-	if (errno)
+	if (str == endptr && (str[0] == '-' || str[0] == '+') && str[1] == '.')
+		endptr += 1;
+	else if (errno)
 		return SR_ERR;
 
+	if (integral < 0 || str[0] == '-')
+		is_negative = 1;
+
 	if (*endptr == '.') {
 		const char* start = endptr + 1;
 		fractional = g_ascii_strtoll(start, &endptr, 10);
@@ -261,7 +267,7 @@ SR_API int sr_parse_rational(const char *str, struct sr_rational *ret)
 		integral *= 10;
 	exponent -= fractional_len;
 
-	if (integral >= 0)
+	if (!is_negative)
 		integral += fractional;
 	else
 		integral -= fractional;