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)
26
size_t strlcpy(char *dest, const char *src, size_t size)
28
size_t ret = strlen(src);
31
size_t len = (ret >= size) ? size - 1 : ret;
32
memcpy(dest, src, len);
39
static char *get_pathname(void)
41
static char pathname_array[4][PATH_MAX];
44
return pathname_array[3 & ++idx];
47
static char *cleanup_path(char *path)
50
if (!memcmp(path, "./", 2)) {
58
static char *perf_vsnpath(char *buf, size_t n, const char *fmt, va_list args)
60
const char *perf_dir = get_perf_dir();
63
len = strlen(perf_dir);
66
memcpy(buf, perf_dir, len);
67
if (len && !is_dir_sep(perf_dir[len-1]))
69
len += vsnprintf(buf + len, n - len, fmt, args);
72
return cleanup_path(buf);
74
strlcpy(buf, bad_path, n);
78
char *perf_pathdup(const char *fmt, ...)
83
(void)perf_vsnpath(path, sizeof(path), fmt, args);
88
char *mkpath(const char *fmt, ...)
92
char *pathname = get_pathname();
95
len = vsnprintf(pathname, PATH_MAX, fmt, args);
99
return cleanup_path(pathname);
102
char *perf_path(const char *fmt, ...)
104
const char *perf_dir = get_perf_dir();
105
char *pathname = get_pathname();
109
len = strlen(perf_dir);
110
if (len > PATH_MAX-100)
112
memcpy(pathname, perf_dir, len);
113
if (len && perf_dir[len-1] != '/')
114
pathname[len++] = '/';
116
len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
120
return cleanup_path(pathname);
123
/* strip arbitrary amount of directory separators at end of path */
124
static inline int chomp_trailing_dir_sep(const char *path, int len)
126
while (len && is_dir_sep(path[len - 1]))
132
* If path ends with suffix (complete path components), returns the
133
* part before suffix (sans trailing directory separators).
134
* Otherwise returns NULL.
136
char *strip_path_suffix(const char *path, const char *suffix)
138
int path_len = strlen(path), suffix_len = strlen(suffix);
144
if (is_dir_sep(path[path_len - 1])) {
145
if (!is_dir_sep(suffix[suffix_len - 1]))
147
path_len = chomp_trailing_dir_sep(path, path_len);
148
suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
150
else if (path[--path_len] != suffix[--suffix_len])
154
if (path_len && !is_dir_sep(path[path_len - 1]))
156
return strndup(path, chomp_trailing_dir_sep(path, path_len));