Re: [PATCH 3/5] Add is_root_path()

[Johannes Sixt <j6t@kdbg.org>]

Nguyễn Thái Ngọc Duy schrieb:
> This function returns the length of the root part of a path, or zero if
> there is no root.

That is, the function primarily doesn't act as a predicate, and in fact 
you never use it as such.

I just noticed that this function is identical to offset_1st_component() 
in sha1_file.c.

> --- a/git-compat-util.h
> +++ b/git-compat-util.h
> @@ -210,6 +210,17 @@ static inline const char *skip_prefix(const char *str, const char *prefix)
>  	return strncmp(str, prefix, len) ? NULL : str + len;
>  }
>  
> +/* path must be canonical */
> +static inline int is_root_path(const char *path)
> +{
> +	int len = 0;
> +	if (has_dos_drive_prefix(path))
> +		len += 2;
> +	if (is_dir_sep(path[len]))
> +		len++;
> +	return len;
> +}
> +
>  #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)

This is not a good location for this function because on Windows we get 
warnings about implicitly defined function isalpha() (which is hidden in 
the macro has_dos_drive_prefix).

I suggest to move offset_1st_component() to path.c, which would not be 
inlined anymore.

-- Hannes