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fs: update + consolidate path normalization logic

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This commit is contained in:
Michael Scire 2020-12-06 19:56:45 -08:00
parent 5ef93778f6
commit 32803d9920
22 changed files with 1007 additions and 463 deletions
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79
libraries/libstratosphere/include/stratosphere/fs/fs_path_utils.hpp
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@ -19,15 +19,59 @@
namespace ams::fs {
namespace StringTraits {
constexpr inline char DirectorySeparator = '/';
constexpr inline char DriveSeparator = ':';
constexpr inline char Dot = '.';
constexpr inline char NullTerminator = '\x00';
constexpr inline char AlternateDirectorySeparator = '\\';
}
/* Windows path utilities. */
constexpr inline bool IsWindowsDrive(const char *path) {
AMS_ASSERT(path != nullptr);
const char c = path[0];
return (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z')) && path[1] == StringTraits::DriveSeparator;
}
constexpr inline bool IsUnc(const char *path) {
return (path[0] == StringTraits::DirectorySeparator && path[1] == StringTraits::DirectorySeparator) ||
(path[0] == StringTraits::AlternateDirectorySeparator && path[1] == StringTraits::AlternateDirectorySeparator);
}
constexpr inline s64 GetWindowsPathSkipLength(const char *path) {
if (IsWindowsDrive(path)) {
return 2;
}
if (IsUnc(path)) {
for (s64 i = 2; path[i] != StringTraits::NullTerminator; ++i) {
if (path[i] == '$' || path[i] == ':') {
return i + 1;
}
}
}
return 0;
}
/* Path utilities. */
inline void Replace(char *dst, size_t dst_size, char old_char, char new_char) {
for (char *cur = dst; cur < dst + dst_size && *cur != '\x00'; cur++) {
AMS_ASSERT(dst != nullptr);
for (char *cur = dst; cur < dst + dst_size && *cur != StringTraits::NullTerminator; ++cur) {
if (*cur == old_char) {
*cur = new_char;
}
}
}
Result FspPathPrintf(fssrv::sf::FspPath *dst, const char *format, ...) __attribute__((format(printf, 2, 3)));
inline Result FspPathPrintf(fssrv::sf::FspPath *dst, const char *format, ...) {
AMS_ASSERT(dst != nullptr);
/* Format the path. */
std::va_list va_list;
va_start(va_list, format);
@ -43,6 +87,37 @@ namespace ams::fs {
return ResultSuccess();
}
Result VerifyPath(const char *path, size_t max_path_len, size_t max_name_len);
Result VerifyPath(const char *path, int max_path_len, int max_name_len);
bool IsSubPath(const char *lhs, const char *rhs);
/* Path normalization. */
class PathNormalizer {
public:
static constexpr const char RootPath[] = "/";
public:
static constexpr inline bool IsSeparator(char c) {
return c == StringTraits::DirectorySeparator;
}
static constexpr inline bool IsAnySeparator(char c) {
return c == StringTraits::DirectorySeparator || c == StringTraits::AlternateDirectorySeparator;
}
static constexpr inline bool IsNullTerminator(char c) {
return c == StringTraits::NullTerminator;
}
static constexpr inline bool IsCurrentDirectory(const char *p) {
return p[0] == StringTraits::Dot && (IsSeparator(p[1]) || IsNullTerminator(p[1]));
}
static constexpr inline bool IsParentDirectory(const char *p) {
return p[0] == StringTraits::Dot && p[1] == StringTraits::Dot && (IsSeparator(p[2]) || IsNullTerminator(p[2]));
}
static Result Normalize(char *out, size_t *out_len, const char *src, size_t max_out_size, bool unc_preserved = false, bool has_mount_name = false);
static Result IsNormalized(bool *out, const char *path, bool unc_preserved = false, bool has_mount_name = false);
};
}