X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fstrutil.c;h=5f0deb7708f374327b6c5d33e7649ca3da342948;hb=ae32859759fabe98361201f0b70489d02dddf13b;hp=fd9a438e647a6210e63091050b78c7790ffe97be;hpb=b5df922e4fbe30d04882658778d2900939e869fe;p=libsigrok.git

diff --git a/src/strutil.c b/src/strutil.c
index fd9a438e..5f0deb77 100644
--- a/src/strutil.c
+++ b/src/strutil.c
@@ -23,6 +23,7 @@
 #include <string.h>
 #include <strings.h>
 #include <errno.h>
+#include <stdbool.h>
 #include <libsigrok/libsigrok.h>
 #include "libsigrok-internal.h"
 
@@ -233,13 +234,19 @@ 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;
+	bool is_negative = false;
 
 	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 = true;
+
 	if (*endptr == '.') {
 		const char* start = endptr + 1;
 		fractional = g_ascii_strtoll(start, &endptr, 10);
@@ -261,7 +268,7 @@ 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;