config: don't multiply in parse_unit_factor()

parse_unit_factor() multiplies the number that is passed to it with the
value of a recognized unit factor (K, M or G for 2^10, 2^20 and 2^30,
respectively).  All callers pass in 1 as a number, though, which allows
them to check the actual multiplication for overflow before they are
doing it themselves.

Ignore the passed in number and don't multiply, as this feature of
parse_unit_factor() is not used anymore.  Rename the output parameter to
reflect that it's not about the end result anymore, but just about the
unit factor.

Suggested-by: Johannes Schindelin <[email protected]>
Signed-off-by: Rene Scharfe <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: rscharfe

config.c

@@ -834,20 +834,22 @@ static int git_parse_source(config_fn_t fn, void *data,
 	return error_return;
 }
 
-static int parse_unit_factor(const char *end, uintmax_t *val)
+static int parse_unit_factor(const char *end, uintmax_t *factor)
 {
-	if (!*end)
+	if (!*end) {
+		*factor = 1;
 		return 1;
+	}
 	else if (!strcasecmp(end, "k")) {
-		*val *= 1024;
+		*factor = 1024;
 		return 1;
 	}
 	else if (!strcasecmp(end, "m")) {
-		*val *= 1024 * 1024;
+		*factor = 1024 * 1024;
 		return 1;
 	}
 	else if (!strcasecmp(end, "g")) {
-		*val *= 1024 * 1024 * 1024;
+		*factor = 1024 * 1024 * 1024;
 		return 1;
 	}
 	return 0;
@@ -859,7 +861,7 @@ static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 		char *end;
 		intmax_t val;
 		uintmax_t uval;
-		uintmax_t factor = 1;
+		uintmax_t factor;
 
 		errno = 0;
 		val = strtoimax(value, &end, 0);
@@ -888,7 +890,7 @@ static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 	if (value && *value) {
 		char *end;
 		uintmax_t val;
-		uintmax_t factor = 1;
+		uintmax_t factor;
 
 		errno = 0;
 		val = strtoumax(value, &end, 0);