[PATCH v2 3/3] config: simplify parsing of unit factors

[René Scharfe <l.s.r@xxxxxx>]

Just return the value of the factor or zero for unrecognized strings
instead of using an output reference and a separate return value to
indicate success.  This is shorter and simpler.

It basically reverts that function to before c8deb5a146 ("Improve error
messages when int/long cannot be parsed from config", 2007-12-25), while
keeping the better messages, so restore its old name, get_unit_factor(),
as well.

Signed-off-by: Rene Scharfe <l.s.r@xxxxxx>
---
Change from v1: The "else" is kept in each branch, even though it's not
needed, to match the original code from before c8deb5a146.  Other than
that this series arrives at the same end result.  Patch 3 can be
dropped easily if it's not convincing.

 config.c | 30 ++++++++++++------------------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/config.c b/config.c
index a8bd1d821e..26196bdccf 100644
--- a/config.c
+++ b/config.c
@@ -834,24 +834,16 @@ static int git_parse_source(config_fn_t fn, void *data,
 	return error_return;
 }

-static int parse_unit_factor(const char *end, uintmax_t *factor)
+static uintmax_t get_unit_factor(const char *end)
 {
-	if (!*end) {
-		*factor = 1;
+	if (!*end)
 		return 1;
-	}
-	else if (!strcasecmp(end, "k")) {
-		*factor = 1024;
-		return 1;
-	}
-	else if (!strcasecmp(end, "m")) {
-		*factor = 1024 * 1024;
-		return 1;
-	}
-	else if (!strcasecmp(end, "g")) {
-		*factor = 1024 * 1024 * 1024;
-		return 1;
-	}
+	else if (!strcasecmp(end, "k"))
+		return 1024;
+	else if (!strcasecmp(end, "m"))
+		return 1024 * 1024;
+	else if (!strcasecmp(end, "g"))
+		return 1024 * 1024 * 1024;
 	return 0;
 }

@@ -867,7 +859,8 @@ static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 		val = strtoimax(value, &end, 0);
 		if (errno == ERANGE)
 			return 0;
-		if (!parse_unit_factor(end, &factor)) {
+		factor = get_unit_factor(end);
+		if (!factor) {
 			errno = EINVAL;
 			return 0;
 		}
@@ -896,7 +889,8 @@ static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 		val = strtoumax(value, &end, 0);
 		if (errno == ERANGE)
 			return 0;
-		if (!parse_unit_factor(end, &factor)) {
+		factor = get_unit_factor(end);
+		if (!factor) {
 			errno = EINVAL;
 			return 0;
 		}
--
2.22.0