From: Gerhard Sittig <redacted>
Date: Thu, 19 Jul 2018 20:12:15 +0000 (+0200)
Subject: strutil: insist in some mantissa for parse rational
X-Git-Url: http://sigrok.org/gitweb/?p=libsigrok.git;a=commitdiff_plain;h=d87549636609d2a01722eb6ad185cd4666d04ebb

strutil: insist in some mantissa for parse rational

The previous implementation accepted either empty integer or empty
fractional parts of a floating point number, but also when both parts
were missing ("." input). Insist in at least one of the parts to be
present.
---

diff --git a/src/strutil.c b/src/strutil.c
index 07ed7b44..b6c910f7 100644
--- a/src/strutil.c
+++ b/src/strutil.c
@@ -615,6 +615,7 @@ SR_API int sr_parse_rational(const char *str, struct sr_rational *ret)
 	int32_t fractional_len = 0;
 	int32_t exponent = 0;
 	bool is_negative = false;
+	bool no_integer, no_fractional;
 
 	while (isspace(*str))
 		str++;
@@ -622,12 +623,16 @@ SR_API int sr_parse_rational(const char *str, struct sr_rational *ret)
 	errno = 0;
 	integral = g_ascii_strtoll(str, &endptr, 10);
 
-	if (str == endptr && (str[0] == '-' || str[0] == '+') && str[1] == '.')
+	if (str == endptr && (str[0] == '-' || str[0] == '+') && str[1] == '.') {
 		endptr += 1;
-	else if (str == endptr && str[0] == '.')
-		/* EMPTY */;
-	else if (errno)
+		no_integer = true;
+	} else if (str == endptr && str[0] == '.') {
+		no_integer = true;
+	} else if (errno) {
 		return SR_ERR;
+	} else {
+		no_integer = false;
+	}
 
 	if (integral < 0 || str[0] == '-')
 		is_negative = true;
@@ -645,6 +650,9 @@ SR_API int sr_parse_rational(const char *str, struct sr_rational *ret)
 		}
 		if (errno)
 			return SR_ERR;
+		no_fractional = endptr == start;
+		if (no_integer && no_fractional)
+			return SR_ERR;
 		fractional_len = endptr - start;
 	}