2 * I'm tired of doing "vsnprintf()" etc just to open a
3 * file, so here's a "return static buffer with printf"
6 * It's obviously not thread-safe. Sue me. But it's quite
7 * useful for doing things like
9 * f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
11 * which is what it's designed for.
15 static char bad_path
[] = "/bad-path/";
20 static const char *get_perf_dir(void)
25 static char *get_pathname(void)
27 static char pathname_array
[4][PATH_MAX
];
30 return pathname_array
[3 & ++idx
];
33 static char *cleanup_path(char *path
)
36 if (!memcmp(path
, "./", 2)) {
44 char *mkpath(const char *fmt
, ...)
48 char *pathname
= get_pathname();
51 len
= vsnprintf(pathname
, PATH_MAX
, fmt
, args
);
55 return cleanup_path(pathname
);
58 char *perf_path(const char *fmt
, ...)
60 const char *perf_dir
= get_perf_dir();
61 char *pathname
= get_pathname();
65 len
= strlen(perf_dir
);
66 if (len
> PATH_MAX
-100)
68 memcpy(pathname
, perf_dir
, len
);
69 if (len
&& perf_dir
[len
-1] != '/')
70 pathname
[len
++] = '/';
72 len
+= vsnprintf(pathname
+ len
, PATH_MAX
- len
, fmt
, args
);
76 return cleanup_path(pathname
);
79 /* strip arbitrary amount of directory separators at end of path */
80 static inline int chomp_trailing_dir_sep(const char *path
, int len
)
82 while (len
&& is_dir_sep(path
[len
- 1]))
88 * If path ends with suffix (complete path components), returns the
89 * part before suffix (sans trailing directory separators).
90 * Otherwise returns NULL.
92 char *strip_path_suffix(const char *path
, const char *suffix
)
94 int path_len
= strlen(path
), suffix_len
= strlen(suffix
);
100 if (is_dir_sep(path
[path_len
- 1])) {
101 if (!is_dir_sep(suffix
[suffix_len
- 1]))
103 path_len
= chomp_trailing_dir_sep(path
, path_len
);
104 suffix_len
= chomp_trailing_dir_sep(suffix
, suffix_len
);
106 else if (path
[--path_len
] != suffix
[--suffix_len
])
110 if (path_len
&& !is_dir_sep(path
[path_len
- 1]))
112 return strndup(path
, chomp_trailing_dir_sep(path
, path_len
));
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