/*
 * montauk-paths.h -- teach git what an absolute path looks like on MontaukOS.
 *
 * FORCE-INCLUDED into every translation unit (-include, see the port
 * Makefile), because it has to win the #ifndef guards in git-compat-util.h.
 *
 * MontaukOS paths are drive-prefixed: "0:/users/dan/repo". getcwd() returns
 * one of those, and the kernel's path resolver (kernel/src/Api/Path.hpp)
 * accepts three forms -- "N:/abs", "/abs" (the current drive's root) and
 * "rel/ative" against the process cwd.
 *
 * Without this header git's is_absolute_path() is just is_dir_sep(path[0]),
 * so every MontaukOS absolute path reads as RELATIVE and git helpfully
 * prepends the cwd to it: "0:/users/dan/repo/0:/users/dan/repo". That breaks
 * setup_git_directory(), real_path() and every worktree path it stores.
 *
 * The fix reuses git's existing Windows abstraction rather than inventing
 * one: has_dos_drive_prefix / skip_dos_drive_prefix / offset_1st_component
 * are exactly the hooks the DOS "C:/" case goes through, and a MontaukOS
 * drive differs only in being a digit run rather than a letter. The bodies
 * below mirror compat/win32/path-utils.c, minus the UNC handling, which has
 * no MontaukOS equivalent.
 */
#ifndef _MONTAUK_GIT_PATHS_H_
#define _MONTAUK_GIT_PATHS_H_

/*
 * "12:" as well as "0:" -- ParseDrivePrefix() accepts a multi-digit drive
 * number, so this must too, or a two-digit drive would silently be treated
 * as a relative path.
 */
static inline int montauk_has_drive_prefix(const char *path)
{
	int i = 0;

	if (!path)
		return 0;
	while (path[i] >= '0' && path[i] <= '9')
		i++;
	return i > 0 && path[i] == ':';
}
#define has_dos_drive_prefix montauk_has_drive_prefix

static inline int montauk_skip_drive_prefix(char **path)
{
	int i = 0;

	if (!montauk_has_drive_prefix(*path))
		return 0;

	while ((*path)[i] >= '0' && (*path)[i] <= '9')
		i++;
	*path += i + 1;   /* the digits and the ':' */
	return 1;
}
#define skip_dos_drive_prefix montauk_skip_drive_prefix

/*
 * Length of the leading "root" of the path: the drive prefix plus one
 * separator if present. Mirrors win32_offset_1st_component().
 */
static inline int montauk_offset_1st_component(const char *path)
{
	char *pos = (char *)path;

	montauk_skip_drive_prefix(&pos);
	return (int)(pos - path) + (*pos == '/');
}
#define offset_1st_component montauk_offset_1st_component

#endif /* _MONTAUK_GIT_PATHS_H_ */