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From: Jeff King <peff@peff.net>
To: git@vger.kernel.org
Subject: [PATCH 4/6] git_config_parse_key(): return baselen as size_t
Date: Fri, 10 Apr 2020 15:46:07 -0400	[thread overview]
Message-ID: <20200410194607.GD1363756@coredump.intra.peff.net> (raw)
In-Reply-To: <20200410194211.GA1363484@coredump.intra.peff.net>

As with the recent change to parse_config_key(), the best type to return
a string length is a size_t, as it won't cause integer truncation for a
gigantic key. And as with that change, this is mostly a clarity /
hygiene issue for now, as our config parser would choke on such a large
key anyway.

There are a few ripple effects within the config code, as callers switch
to using size_t. I also adjusted a few related variables that iterate
over strings. The most unexpected change is that a call to strbuf_addf()
had to switch to strbuf_add(). We can't use a size_t with "%.*s",
because printf precisions must have type "int" (we could cast, of
course, but that would miss the point of using size_t in the first
place).

Signed-off-by: Jeff King <peff@peff.net>
---
 config.c | 17 ++++++++++-------
 config.h |  2 +-
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/config.c b/config.c
index 7ea588a7e0..c48bb35dc0 100644
--- a/config.c
+++ b/config.c
@@ -358,12 +358,13 @@ static inline int iskeychar(int c)
  *
  * store_key - pointer to char* which will hold a copy of the key with
  *             lowercase section and variable name
- * baselen - pointer to int which will hold the length of the
+ * baselen - pointer to size_t which will hold the length of the
  *           section + subsection part, can be NULL
  */
-static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
+static int git_config_parse_key_1(const char *key, char **store_key, size_t *baselen_, int quiet)
 {
-	int i, dot, baselen;
+	size_t i, baselen;
+	int dot;
 	const char *last_dot = strrchr(key, '.');
 
 	/*
@@ -425,7 +426,7 @@ static int git_config_parse_key_1(const char *key, char **store_key, int *basele
 	return -CONFIG_INVALID_KEY;
 }
 
-int git_config_parse_key(const char *key, char **store_key, int *baselen)
+int git_config_parse_key(const char *key, char **store_key, size_t *baselen)
 {
 	return git_config_parse_key_1(key, store_key, baselen, 0);
 }
@@ -2383,7 +2384,7 @@ void git_die_config(const char *key, const char *err, ...)
  */
 
 struct config_store_data {
-	int baselen;
+	size_t baselen;
 	char *key;
 	int do_not_match;
 	regex_t *value_regex;
@@ -2509,7 +2510,7 @@ static struct strbuf store_create_section(const char *key,
 					  const struct config_store_data *store)
 {
 	const char *dot;
-	int i;
+	size_t i;
 	struct strbuf sb = STRBUF_INIT;
 
 	dot = memchr(key, '.', store->baselen);
@@ -2522,7 +2523,9 @@ static struct strbuf store_create_section(const char *key,
 		}
 		strbuf_addstr(&sb, "\"]\n");
 	} else {
-		strbuf_addf(&sb, "[%.*s]\n", store->baselen, key);
+		strbuf_addch(&sb, '[');
+		strbuf_add(&sb, key, store->baselen);
+		strbuf_addstr(&sb, "]\n");
 	}
 
 	return sb;
diff --git a/config.h b/config.h
index d57df283b3..060874488f 100644
--- a/config.h
+++ b/config.h
@@ -254,7 +254,7 @@ int git_config_set_gently(const char *, const char *);
  */
 void git_config_set(const char *, const char *);
 
-int git_config_parse_key(const char *, char **, int *);
+int git_config_parse_key(const char *, char **, size_t *);
 int git_config_key_is_valid(const char *key);
 int git_config_set_multivar_gently(const char *, const char *, const char *, int);
 void git_config_set_multivar(const char *, const char *, const char *, int);
-- 
2.26.0.414.ge3a6455e3d


  parent reply	other threads:[~2020-04-10 19:46 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-10 19:42 [PATCH 0/6] better handling of gigantic config files Jeff King
2020-04-10 19:43 ` [PATCH 1/6] remote: drop auto-strlen behavior of make_branch() and make_rewrite() Jeff King
2020-04-10 21:44   ` Junio C Hamano
2020-04-10 19:44 ` [PATCH 2/6] parse_config_key(): return subsection len as size_t Jeff King
2020-04-10 19:44 ` [PATCH 3/6] config: drop useless length variable in write_pair() Jeff King
2020-04-10 21:51   ` Junio C Hamano
2020-04-10 19:46 ` Jeff King [this message]
2020-04-10 19:47 ` [PATCH 5/6] config: use size_t to store parsed variable baselen Jeff King
2020-04-10 19:50 ` [PATCH 6/6] config: reject parsing of files over INT_MAX Jeff King
2020-04-10 22:04   ` Junio C Hamano
2020-04-10 22:15     ` Jeff King
2020-04-13  0:47       ` Taylor Blau
2020-04-13 22:14         ` Junio C Hamano
2020-04-13  0:49 ` [PATCH 0/6] better handling of gigantic config files Taylor Blau
2020-04-13 17:20   ` Jeff King
2020-04-13 17:23     ` Taylor Blau

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