[PATCH 3/2] commit: remove find_header_mem()

[René Scharfe <l.s.r@xxxxxx>]

cfc5cf428b (receive-pack.c: consolidate find header logic, 2022-01-06)
introduced find_header_mem() and turned find_commit_header() into a thin
wrapper.  Since then, the latter has become the last remaining caller of
the former.  Remove it to restore find_commit_header() to the state
before cfc5cf428b, get rid of a strlen(3) call and resolve a NEEDSWORK
note in the process.

Signed-off-by: René Scharfe <l.s.r@xxxxxx>
---
 commit.c | 16 ++--------------
 commit.h |  5 -----
 2 files changed, 2 insertions(+), 19 deletions(-)

diff --git a/commit.c b/commit.c
index 1d08951007..aacc401e72 100644
--- a/commit.c
+++ b/commit.c
@@ -1870,20 +1870,12 @@ struct commit_list **commit_list_append(struct commit *commit,
 	return &new_commit->next;
 }

-const char *find_header_mem(const char *msg, size_t len,
-			const char *key, size_t *out_len)
+const char *find_commit_header(const char *msg, const char *key, size_t *out_len)
 {
 	int key_len = strlen(key);
 	const char *line = msg;

-	/*
-	 * NEEDSWORK: It's possible for strchrnul() to scan beyond the range
-	 * given by len. However, current callers are safe because they compute
-	 * len by scanning a NUL-terminated block of memory starting at msg.
-	 * Nonetheless, it would be better to ensure the function does not look
-	 * at msg beyond the len provided by the caller.
-	 */
-	while (line && line < msg + len) {
+	while (line) {
 		const char *eol = strchrnul(line, '\n');

 		if (line == eol)
@@ -1900,10 +1892,6 @@ const char *find_header_mem(const char *msg, size_t len,
 	return NULL;
 }

-const char *find_commit_header(const char *msg, const char *key, size_t *out_len)
-{
-	return find_header_mem(msg, strlen(msg), key, out_len);
-}
 /*
  * Inspect the given string and determine the true "end" of the log message, in
  * order to find where to put a new Signed-off-by trailer.  Ignored are
diff --git a/commit.h b/commit.h
index 62fe0d77a7..3084f591fd 100644
--- a/commit.h
+++ b/commit.h
@@ -280,17 +280,12 @@ void free_commit_extra_headers(struct commit_extra_header *extra);

 /*
  * Search the commit object contents given by "msg" for the header "key".
- * Reads up to "len" bytes of "msg".
  * Returns a pointer to the start of the header contents, or NULL. The length
  * of the header, up to the first newline, is returned via out_len.
  *
  * Note that some headers (like mergetag) may be multi-line. It is the caller's
  * responsibility to parse further in this case!
  */
-const char *find_header_mem(const char *msg, size_t len,
-			const char *key,
-			size_t *out_len);
-
 const char *find_commit_header(const char *msg, const char *key,
 			       size_t *out_len);

--
2.45.2