[PATCH 1/3] Add is_absolute_path() and make_absolute_path() functions

[Johannes Schindelin <Johannes.Schindelin@gmx.de>]

This patch adds convenience functions to work with absolute paths.
The function is_absolute_path() should help the efforts to integrate
the MinGW fork.

Note that make_absolute_path() returns a pointer to a static buffer.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
	I am in the middle of so many things, otherwise I would have
	tried to find all places that can use these functions.  But
	maybe a helpful soul out there wants to do that?

 cache.h |    5 +++++
 path.c  |   18 ++++++++++++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/cache.h b/cache.h
index 53801b8..98af530 100644
--- a/cache.h
+++ b/cache.h
@@ -358,6 +358,11 @@ int git_config_perm(const char *var, const char *value);
 int adjust_shared_perm(const char *path);
 int safe_create_leading_directories(char *path);
 char *enter_repo(char *path, int strict);
+static inline int is_absolute_path(const char *path)
+{
+	return path[0] == '/';
+}
+const char *make_absolute_path(const char *path);
 
 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 extern int sha1_object_info(const unsigned char *, unsigned long *);
diff --git a/path.c b/path.c
index c4ce962..b5b1959 100644
--- a/path.c
+++ b/path.c
@@ -292,3 +292,21 @@ int adjust_shared_perm(const char *path)
 		return -2;
 	return 0;
 }
+
+const char *make_absolute_path(const char *path)
+{
+	static char buf[PATH_MAX];
+	const int size = sizeof(buf);
+	int len;
+
+	if (is_absolute_path(path))
+		return path;
+
+	if (!getcwd(buf, size))
+		die ("Could not get current working directory");
+	len = strlen(buf);
+	if (snprintf(buf + len, size - len, "/%s", path) > size - 1)
+		die ("Could not make absolute path from '%s'", path);
+	return buf;
+}
+
-- 
1.5.3.rc2.29.gc4640f