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path: extract win32_path_prefix function

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Extract code which determines if a path is at a Windows system's root.
This incluses drive prefixes (e.g. "C:\") as well as network computer
names (e.g. "//computername/").
This commit is contained in:
Patrick Steinhardt 2017-02-07 20:21:38 +01:00
parent 887c1931a2
commit d8c06070a8
1 changed files with 33 additions and 23 deletions
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56
src/path.c
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@ -110,6 +110,34 @@ Exit:
return result;
}
/*
* Determine if the path is a Windows prefix and, if so, returns
* its actual lentgh. If it is not a prefix, returns -1.
*/
static int win32_prefix_length(const char *path, int len)
{
#ifndef GIT_WIN32
GIT_UNUSED(path);
GIT_UNUSED(len);
#else
/*
* Mimic unix behavior where '/.git' returns '/': 'C:/.git' will return
* 'C:/' here
*/
if (len == 2 && LOOKS_LIKE_DRIVE_PREFIX(path))
return 3;
/*
* Similarly checks if we're dealing with a network computer name
* '//computername/.git' will return '//computername/'
*/
if (looks_like_network_computer_name(path, len))
return len + 1;
#endif
return -1;
}
/*
* Based on the Android implementation, BSD licensed.
* Check http://android.git.kernel.org/
@ -117,7 +145,7 @@ Exit:
int git_path_dirname_r(git_buf *buffer, const char *path)
{
const char *endp;
int result, len;
int len;
/* Empty or NULL string gets treated as "." */
if (path == NULL || *path == '\0') {
@ -146,35 +174,17 @@ int git_path_dirname_r(git_buf *buffer, const char *path)
endp--;
} while (endp > path && *endp == '/');
if ((len = win32_prefix_length(path, endp - path + 1)) > 0)
goto Exit;
/* Cast is safe because max path < max int */
len = (int)(endp - path + 1);
#ifdef GIT_WIN32
/* Mimic unix behavior where '/.git' returns '/': 'C:/.git' will return
'C:/' here */
if (len == 2 && LOOKS_LIKE_DRIVE_PREFIX(path)) {
len = 3;
goto Exit;
}
/* Similarly checks if we're dealing with a network computer name
'//computername/.git' will return '//computername/' */
if (looks_like_network_computer_name(path, len)) {
len++;
goto Exit;
}
#endif
Exit:
result = len;
if (buffer != NULL && git_buf_set(buffer, path, len) < 0)
return -1;
return result;
return len;
}