[PATCH 02/17] cache.h: complete set of git_path_submodule helpers

[Jeff King]

The git_path function has "git_pathdup" and
"strbuf_git_path" variants, but git_submodule_path only
comes in the dangerous, static-buffer variant. That makes
refactoring callers to use the safer functions hard (since
they don't exist).

Since we're already using a strbuf behind the scenes, it's
easy to expose all three of these interfaces with thin
wrappers.

Signed-off-by: Jeff King <p...@peff.net>
---
 cache.h |  5 +++++
 path.c  | 35 ++++++++++++++++++++++++++++++-----
 2 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/cache.h b/cache.h
index 8db884e..6f74f33 100644
--- a/cache.h
+++ b/cache.h
@@ -724,10 +724,15 @@ extern char *mksnpath(char *buf, size_t n, const char 
*fmt, ...)
        __attribute__((format (printf, 3, 4)));
 extern void strbuf_git_path(struct strbuf *sb, const char *fmt, ...)
        __attribute__((format (printf, 2, 3)));
+extern void strbuf_git_path_submodule(struct strbuf *sb, const char *path,
+                                     const char *fmt, ...)
+       __attribute__((format (printf, 3, 4)));
 extern char *git_pathdup(const char *fmt, ...)
        __attribute__((format (printf, 1, 2)));
 extern char *mkpathdup(const char *fmt, ...)
        __attribute__((format (printf, 1, 2)));
+extern char *git_pathdup_submodule(const char *path, const char *fmt, ...)
+       __attribute__((format (printf, 2, 3)));
 
 extern void report_linked_checkout_garbage(void);
 
diff --git a/path.c b/path.c
index 10f4cbf..9aad9a1 100644
--- a/path.c
+++ b/path.c
@@ -224,11 +224,10 @@ const char *mkpath(const char *fmt, ...)
        return cleanup_path(pathname->buf);
 }
 
-const char *git_path_submodule(const char *path, const char *fmt, ...)
+static void do_submodule_path(struct strbuf *buf, const char *path,
+                             const char *fmt, va_list args)
 {
-       struct strbuf *buf = get_pathname();
        const char *git_dir;
-       va_list args;
 
        strbuf_addstr(buf, path);
        if (buf->len && buf->buf[buf->len - 1] != '/')
@@ -242,13 +241,39 @@ const char *git_path_submodule(const char *path, const 
char *fmt, ...)
        }
        strbuf_addch(buf, '/');
 
-       va_start(args, fmt);
        strbuf_vaddf(buf, fmt, args);
-       va_end(args);
        strbuf_cleanup_path(buf);
+}
+
+const char *git_path_submodule(const char *path, const char *fmt, ...)
+{
+       va_list args;
+       struct strbuf *buf = get_pathname();
+       va_start(args, fmt);
+       do_submodule_path(buf, path, fmt, args);
+       va_end(args);
        return buf->buf;
 }
 
+char *git_pathdup_submodule(const char *path, const char *fmt, ...)
+{
+       va_list args;
+       struct strbuf buf = STRBUF_INIT;
+       va_start(args, fmt);
+       do_submodule_path(&buf, path, fmt, args);
+       va_end(args);
+       return strbuf_detach(&buf, NULL);
+}
+
+void strbuf_git_path_submodule(struct strbuf *buf, const char *path,
+                              const char *fmt, ...)
+{
+       va_list args;
+       va_start(args, fmt);
+       do_submodule_path(buf, path, fmt, args);
+       va_end(args);
+}
+
 int validate_headref(const char *path)
 {
        struct stat st;
-- 
2.5.0.414.g670f2a4

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