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1 | #ifndef UTIL_PATH_H | ||
2 | #define UTIL_PATH_H | ||
3 | |||
4 | #include <stdbool.h> | ||
5 | #include <stddef.h> | ||
6 | #include <string.h> | ||
7 | #include "debug.h" | ||
8 | #include "macros.h" | ||
9 | #include "string-view.h" | ||
10 | #include "xmalloc.h" | ||
11 | |||
12 | NONNULL_ARGS | ||
13 | 323 | static inline bool path_is_absolute(const char *path) | |
14 | { | ||
15 | 323 | return path[0] == '/'; | |
16 | } | ||
17 | |||
18 | // filename must not contain trailing slashes (but it can be "/") | ||
19 | NONNULL_ARGS_AND_RETURN | ||
20 | 395 | static inline const char *path_basename(const char *filename) | |
21 | { | ||
22 | 395 | const char *slash = strrchr(filename, '/'); | |
23 |
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395 | return slash ? slash + 1 : filename; |
24 | } | ||
25 | |||
26 | NONNULL_ARGS | ||
27 | 73 | static inline StringView path_slice_dirname(const char *filename) | |
28 | { | ||
29 | 73 | const char *slash = strrchr(filename, '/'); | |
30 |
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73 | if (!slash) { |
31 | 11 | return strview("."); | |
32 | } | ||
33 | 62 | bool slash_is_root_dir = (slash == filename); | |
34 |
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62 | return string_view(filename, slash_is_root_dir ? 1 : slash - filename); |
35 | } | ||
36 | |||
37 | XSTRDUP | ||
38 | 49 | static inline char *path_dirname(const char *filename) | |
39 | { | ||
40 | 49 | const StringView dir = path_slice_dirname(filename); | |
41 | 49 | return xstrcut(dir.data, dir.length); | |
42 | } | ||
43 | |||
44 | 119 | static inline char *path_join_sv(StringView s1, StringView s2, bool trailing_slash) | |
45 | { | ||
46 | 119 | const char slash[2] = "/"; | |
47 | 119 | size_t n1 = s1.length; | |
48 | 119 | size_t n2 = s2.length; | |
49 |
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119 | size_t sep = n1 && n2 && s1.data[n1 - 1] != '/'; // Separating slash length (1 or 0) |
50 |
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119 | size_t ts = trailing_slash && n2 && s2.data[n2 - 1] != '/'; // Trailing slash length (1 or 0) |
51 | 119 | char *path = xmalloc(xadd3(n1, n2, sep + ts + 1)); | |
52 |
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122 | xmempcpy4(path, s1.data, n1, slash, sep, s2.data, n2, slash + !ts, 2 - !ts); |
53 | 119 | return path; | |
54 | } | ||
55 | |||
56 | 59 | static inline char *path_join(const char *s1, const char *s2) | |
57 | { | ||
58 | 59 | return path_join_sv(strview(s1), strview(s2), false); | |
59 | } | ||
60 | |||
61 | // If path is the root directory, return false. Otherwise, mutate the | ||
62 | // path argument to become its parent directory and return true. Note | ||
63 | // that path *must* be canonical (i.e. as returned by path_absolute()). | ||
64 | 11 | static inline bool path_parent(StringView *path) | |
65 | { | ||
66 | 11 | BUG_ON(!strview_has_prefix(*path, "/")); | |
67 |
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11 | if (unlikely(path->length == 1)) { |
68 | return false; // Root dir | ||
69 | } | ||
70 | |||
71 | // Remove up to 1 trailing slash | ||
72 |
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9 | if (unlikely(strview_remove_matching_suffix(path, "/"))) { |
73 | 1 | BUG_ON(strview_has_suffix(*path, "/")); | |
74 | } | ||
75 | |||
76 | // Adjust the length, to exclude the last path component | ||
77 | 9 | ssize_t slash_idx = strview_memrchr_idx(*path, '/'); | |
78 | 9 | BUG_ON(slash_idx < 0); | |
79 | 9 | path->length = MAX(slash_idx, 1); // Shortest valid path is "/" | |
80 | 9 | return true; | |
81 | } | ||
82 | |||
83 | char *path_absolute(const char *path) MALLOC NONNULL_ARGS; | ||
84 | char *path_relative(const char *absolute, const char *cwd) XSTRDUP; | ||
85 | char *short_filename(const char *absolute, StringView home_dir) XSTRDUP; | ||
86 | char *short_filename_cwd(const char *absolute, const char *cwd, StringView home_dir) XSTRDUP; | ||
87 | const char *path_slice_relative(const char *abs, const char *cwd) NONNULL_ARGS RETURNS_NONNULL; | ||
88 | |||
89 | #endif | ||
90 |