compat/win32/path-utils.c

   1 #include "../../git-compat-util.h"
   2
   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
  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
  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 }