dte test coverage

Directory: ./
File: src/util/path.c
Date: 2025-10-16 19:09:21
Exec Total Coverage
Lines: 70 70 100.0%
Functions: 7 7 100.0%
Branches: 51 56 91.1%
Line Branch Exec Source
1 #include <errno.h>
2 #include <stdlib.h>
3 #include <unistd.h>
4 #include "path.h"
5 #include "str-util.h"
6
7 63 char *path_absolute(const char *path)
8 {
9
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 63 if (unlikely(path[0] == '\0')) {
10 1 errno = EINVAL;
11 1 return NULL;
12 }
13
14 62 char *abs = realpath(path, NULL);
15
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 62 if (abs || errno != ENOENT) {
16 return abs;
17 }
18
19 28 const char *base = path_basename(path);
20 28 char *dir_relative = path_dirname(path);
21 28 char *dir = realpath(dir_relative, NULL);
22 28 free(dir_relative);
23
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 28 if (!dir) {
24 2 errno = ENOENT;
25 2 return NULL;
26 }
27
28 // If the full path doesn't exist but the directory part does, return
29 // the concatenation of the real directory and the non-existent filename
30 26 abs = path_join(dir, base);
31 26 free(dir);
32 26 return abs;
33 }
34
35 115 static bool path_component(const char *path, size_t pos)
36 {
37
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 115 return path[pos] == '\0' || pos == 0 || path[pos - 1] == '/';
38 }
39
40 // Like path_relative(), but always returning either a "borrowed" pointer
41 // into `abs` or the static string ".", thus avoiding the need to allocate.
42 // This most notably means that "../" path components are never used, even
43 // if doing so would produce a path shorter than `abs`.
44 8 const char *path_slice_relative(const char *abs, const char *cwd)
45 {
46 8 BUG_ON(!path_is_absolute(cwd));
47 8 BUG_ON(!path_is_absolute(abs));
48
49 // Special case
50
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 8 if (cwd[1] == '\0') {
51
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 2 return abs[1] == '\0' ? abs : abs + 1;
52 }
53
54 6 size_t clen = str_common_prefix_length(cwd, abs);
55
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 6 if (cwd[clen] == '\0') {
56
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 4 switch (abs[clen]) {
57 1 case '\0':
58 // Identical strings; abs is current directory
59 1 return ".";
60 2 case '/':
61 2 return abs + clen + 1;
62 }
63 }
64
65 return abs;
66 }
67
68 138 char *path_relative(const char *abs, const char *cwd)
69 {
70 138 BUG_ON(!path_is_absolute(cwd));
71 138 BUG_ON(!path_is_absolute(abs));
72
73 // Special case
74
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 138 if (cwd[1] == '\0') {
75
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 2 return xstrdup(abs[1] == '\0' ? abs : abs + 1);
76 }
77
78 136 size_t clen = str_common_prefix_length(cwd, abs);
79
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 136 if (cwd[clen] == '\0') {
80
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 78 switch (abs[clen]) {
81 2 case '\0':
82 // Identical strings; abs is current directory
83 2 return xstrdup(".");
84 75 case '/':
85 // cwd = /home/user
86 // abs = /home/user/project-a/file.c
87 // common = /home/user
88 75 return xstrdup(abs + clen + 1);
89 }
90 }
91
92 // Common path components
93
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 59 if (!path_component(cwd, clen) || !path_component(abs, clen)) {
94
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 17 while (clen > 0 && abs[clen - 1] != '/') {
95 clen--;
96 }
97 }
98
99 // Number of "../" needed
100 59 size_t dotdot = 1;
101 59 const char *slash = strchr(cwd + clen + 1, '/');
102
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 59 if (slash) {
103 54 dotdot++;
104
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 54 if (strchr(slash + 1, '/')) {
105 // Just use absolute path if `dotdot` would be > 2
106 4 return xstrdup(abs);
107 }
108 }
109
110 55 const char *tail = abs + clen;
111 55 return xmemjoin("../../", 3 * dotdot, tail, strlen(tail) + 1);
112 }
113
114 128 static bool path_has_dir_prefix(StringView path, StringView dir)
115 {
116
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 128 return strview_has_sv_prefix(path, dir) && path.data[dir.length] == '/';
117 }
118
119 128 char *short_filename_cwd(const char *abs, const char *cwd, StringView home)
120 {
121 128 StringView abs_sv = strview(abs);
122 128 char *rel = path_relative(abs, cwd);
123 128 size_t abs_len = abs_sv.length;
124 128 size_t rel_len = strlen(rel);
125 128 size_t suffix_len = (abs_len - home.length) + 1;
126
127
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 128 if (path_has_dir_prefix(abs_sv, home) && suffix_len < rel_len) {
128 // Prefer absolute in tilde notation (e.g. "~/abs/path"), if applicable
129 // and shorter than relative
130 2 rel[0] = '~';
131 2 memcpy(rel + 1, abs + home.length, suffix_len);
132
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 126 } else if (abs_len < rel_len) {
133 // Prefer absolute, if shorter than relative
134 1 memcpy(rel, abs, abs_len + 1);
135 }
136
137 128 return rel;
138 }
139
140 50 char *short_filename(const char *abs, StringView home)
141 {
142 50 char buf[8192];
143 50 const char *cwd = getcwd(buf, sizeof buf);
144
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 50 return likely(cwd) ? short_filename_cwd(abs, cwd, home) : xstrdup(abs);
145 }
146