1 #include "../../git-compat-util.h"
2 
win32_has_dos_drive_prefix(const char * path)3 int win32_has_dos_drive_prefix(const char *path)
4 {
5 	int i;
6 
7 	/*
8 	 * Does it start with an ASCII letter (i.e. highest bit not set),
9 	 * followed by a colon?
10 	 */
11 	if (!(0x80 & (unsigned char)*path))
12 		return *path && path[1] == ':' ? 2 : 0;
13 
14 	/*
15 	 * While drive letters must be letters of the English alphabet, it is
16 	 * possible to assign virtually _any_ Unicode character via `subst` as
17 	 * a drive letter to "virtual drives". Even `1`, or `ä`. Or fun stuff
18 	 * like this:
19 	 *
20 	 *      subst ֍: %USERPROFILE%\Desktop
21 	 */
22 	for (i = 1; i < 4 && (0x80 & (unsigned char)path[i]); i++)
23 		; /* skip first UTF-8 character */
24 	return path[i] == ':' ? i + 1 : 0;
25 }
26 
win32_skip_dos_drive_prefix(char ** path)27 int win32_skip_dos_drive_prefix(char **path)
28 {
29 	int ret = has_dos_drive_prefix(*path);
30 	*path += ret;
31 	return ret;
32 }
33 
win32_offset_1st_component(const char * path)34 int win32_offset_1st_component(const char *path)
35 {
36 	char *pos = (char *)path;
37 
38 	/* unc paths */
39 	if (!skip_dos_drive_prefix(&pos) &&
40 			is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
41 		/* skip server name */
42 		pos = strpbrk(pos + 2, "\\/");
43 		if (!pos)
44 			return 0; /* Error: malformed unc path */
45 
46 		do {
47 			pos++;
48 		} while (*pos && !is_dir_sep(*pos));
49 	}
50 
51 	return pos + is_dir_sep(*pos) - path;
52 }
53