[PATCH] apply: replace mksnpath() with a mkpathdup() call

["René Scharfe" <l.s.r@web.de>]

Support paths longer than PATH_MAX in create_one_file() (which is not a
hard limit e.g. on Linux) by calling mkpathdup() instead of mksnpath().
Remove the latter, as it becomes unused by this change.  Resist the
temptation of using the more convenient mkpath() to avoid introducing a
dependency on a static variable deep inside the apply machinery.

Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: René Scharfe <l.s.r@web.de>
---
 apply.c | 13 +++++++++----
 path.c  | 17 -----------------
 path.h  |  6 ------
 3 files changed, 9 insertions(+), 27 deletions(-)

diff --git a/apply.c b/apply.c
index 432837a674..4793b05f3d 100644
--- a/apply.c
+++ b/apply.c
@@ -4502,17 +4502,22 @@ static int create_one_file(struct apply_state *state,
 		unsigned int nr = getpid();

 		for (;;) {
-			char newpath[PATH_MAX];
-			mksnpath(newpath, sizeof(newpath), "%s~%u", path, nr);
+			char *newpath = mkpathdup("%s~%u", path, nr);
 			res = try_create_file(state, newpath, mode, buf, size);
-			if (res < 0)
+			if (res < 0) {
+				free(newpath);
 				return -1;
+			}
 			if (!res) {
-				if (!rename(newpath, path))
+				if (!rename(newpath, path)) {
+					free(newpath);
 					return 0;
+				}
 				unlink_or_warn(newpath);
+				free(newpath);
 				break;
 			}
+			free(newpath);
 			if (errno != EEXIST)
 				break;
 			++nr;
diff --git a/path.c b/path.c
index 8bb223c92c..67229edb9c 100644
--- a/path.c
+++ b/path.c
@@ -28,8 +28,6 @@ static int get_st_mode_bits(const char *path, int *mode)
 	return 0;
 }

-static char bad_path[] = "/bad-path/";
-
 static struct strbuf *get_pathname(void)
 {
 	static struct strbuf pathname_array[4] = {
@@ -59,21 +57,6 @@ static void strbuf_cleanup_path(struct strbuf *sb)
 		strbuf_remove(sb, 0, path - sb->buf);
 }

-char *mksnpath(char *buf, size_t n, const char *fmt, ...)
-{
-	va_list args;
-	unsigned len;
-
-	va_start(args, fmt);
-	len = vsnprintf(buf, n, fmt, args);
-	va_end(args);
-	if (len >= n) {
-		strlcpy(buf, bad_path, n);
-		return buf;
-	}
-	return (char *)cleanup_path(buf);
-}
-
 static int dir_prefix(const char *buf, const char *dir)
 {
 	int len = strlen(dir);
diff --git a/path.h b/path.h
index e053effef2..ea96487b29 100644
--- a/path.h
+++ b/path.h
@@ -23,12 +23,6 @@ const char *mkpath(const char *fmt, ...)
 char *mkpathdup(const char *fmt, ...)
 	__attribute__((format (printf, 1, 2)));

-/*
- * Construct a path and place the result in the provided buffer `buf`.
- */
-char *mksnpath(char *buf, size_t n, const char *fmt, ...)
-	__attribute__((format (printf, 3, 4)));
-
 /*
  * The `git_common_path` family of functions will construct a path into a
  * repository's common git directory, which is shared by all worktrees.
--
2.44.0