git

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#include "../../git-compat-util.h"
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#include "../../environment.h"
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int win32_has_dos_drive_prefix(const char *path)
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{
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	int i;
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	/*
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	 * Does it start with an ASCII letter (i.e. highest bit not set),
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	 * followed by a colon?
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	 */
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	if (!(0x80 & (unsigned char)*path))
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		return *path && path[1] == ':' ? 2 : 0;
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	/*
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	 * While drive letters must be letters of the English alphabet, it is
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	 * possible to assign virtually _any_ Unicode character via `subst` as
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	 * a drive letter to "virtual drives". Even `1`, or `ä`. Or fun stuff
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	 * like this:
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	 *
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	 *      subst ֍: %USERPROFILE%\Desktop
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	 */
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	for (i = 1; i < 4 && (0x80 & (unsigned char)path[i]); i++)
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		; /* skip first UTF-8 character */
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	return path[i] == ':' ? i + 1 : 0;
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}
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int win32_skip_dos_drive_prefix(char **path)
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{
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	int ret = has_dos_drive_prefix(*path);
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	*path += ret;
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	return ret;
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}
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int win32_offset_1st_component(const char *path)
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{
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	char *pos = (char *)path;
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	/* unc paths */
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	if (!skip_dos_drive_prefix(&pos) &&
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			is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
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		/* skip server name */
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		pos = strpbrk(pos + 2, "\\/");
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		if (!pos)
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			return 0; /* Error: malformed unc path */
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		do {
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			pos++;
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		} while (*pos && !is_dir_sep(*pos));
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	}
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	return pos + is_dir_sep(*pos) - path;
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}
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int win32_fspathncmp(const char *a, const char *b, size_t count)
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{
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	int diff;
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	for (;;) {
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		if (!count--)
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			return 0;
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		if (!*a)
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			return *b ? -1 : 0;
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		if (!*b)
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			return +1;
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		if (is_dir_sep(*a)) {
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			if (!is_dir_sep(*b))
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				return -1;
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			a++;
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			b++;
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			continue;
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		} else if (is_dir_sep(*b))
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			return +1;
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		diff = ignore_case ?
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			(unsigned char)tolower(*a) - (int)(unsigned char)tolower(*b) :
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			(unsigned char)*a - (int)(unsigned char)*b;
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		if (diff)
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			return diff;
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		a++;
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		b++;
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	}
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}
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int win32_fspathcmp(const char *a, const char *b)
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{
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	return win32_fspathncmp(a, b, (size_t)-1);
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}
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