144 строки
3.0 KiB
C
144 строки
3.0 KiB
C
/*
|
|
* I'm tired of doing "vsnprintf()" etc just to open a
|
|
* file, so here's a "return static buffer with printf"
|
|
* interface for paths.
|
|
*
|
|
* It's obviously not thread-safe. Sue me. But it's quite
|
|
* useful for doing things like
|
|
*
|
|
* f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
|
|
*
|
|
* which is what it's designed for.
|
|
*/
|
|
#include "cache.h"
|
|
|
|
static char bad_path[] = "/bad-path/";
|
|
/*
|
|
* Two hacks:
|
|
*/
|
|
|
|
static const char *get_perf_dir(void)
|
|
{
|
|
return ".";
|
|
}
|
|
|
|
static char *get_pathname(void)
|
|
{
|
|
static char pathname_array[4][PATH_MAX];
|
|
static int idx;
|
|
|
|
return pathname_array[3 & ++idx];
|
|
}
|
|
|
|
static char *cleanup_path(char *path)
|
|
{
|
|
/* Clean it up */
|
|
if (!memcmp(path, "./", 2)) {
|
|
path += 2;
|
|
while (*path == '/')
|
|
path++;
|
|
}
|
|
return path;
|
|
}
|
|
|
|
static char *perf_vsnpath(char *buf, size_t n, const char *fmt, va_list args)
|
|
{
|
|
const char *perf_dir = get_perf_dir();
|
|
size_t len;
|
|
|
|
len = strlen(perf_dir);
|
|
if (n < len + 1)
|
|
goto bad;
|
|
memcpy(buf, perf_dir, len);
|
|
if (len && !is_dir_sep(perf_dir[len-1]))
|
|
buf[len++] = '/';
|
|
len += vsnprintf(buf + len, n - len, fmt, args);
|
|
if (len >= n)
|
|
goto bad;
|
|
return cleanup_path(buf);
|
|
bad:
|
|
strlcpy(buf, bad_path, n);
|
|
return buf;
|
|
}
|
|
|
|
char *perf_pathdup(const char *fmt, ...)
|
|
{
|
|
char path[PATH_MAX];
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
(void)perf_vsnpath(path, sizeof(path), fmt, args);
|
|
va_end(args);
|
|
return xstrdup(path);
|
|
}
|
|
|
|
char *mkpath(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
unsigned len;
|
|
char *pathname = get_pathname();
|
|
|
|
va_start(args, fmt);
|
|
len = vsnprintf(pathname, PATH_MAX, fmt, args);
|
|
va_end(args);
|
|
if (len >= PATH_MAX)
|
|
return bad_path;
|
|
return cleanup_path(pathname);
|
|
}
|
|
|
|
char *perf_path(const char *fmt, ...)
|
|
{
|
|
const char *perf_dir = get_perf_dir();
|
|
char *pathname = get_pathname();
|
|
va_list args;
|
|
unsigned len;
|
|
|
|
len = strlen(perf_dir);
|
|
if (len > PATH_MAX-100)
|
|
return bad_path;
|
|
memcpy(pathname, perf_dir, len);
|
|
if (len && perf_dir[len-1] != '/')
|
|
pathname[len++] = '/';
|
|
va_start(args, fmt);
|
|
len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
|
|
va_end(args);
|
|
if (len >= PATH_MAX)
|
|
return bad_path;
|
|
return cleanup_path(pathname);
|
|
}
|
|
|
|
/* strip arbitrary amount of directory separators at end of path */
|
|
static inline int chomp_trailing_dir_sep(const char *path, int len)
|
|
{
|
|
while (len && is_dir_sep(path[len - 1]))
|
|
len--;
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* If path ends with suffix (complete path components), returns the
|
|
* part before suffix (sans trailing directory separators).
|
|
* Otherwise returns NULL.
|
|
*/
|
|
char *strip_path_suffix(const char *path, const char *suffix)
|
|
{
|
|
int path_len = strlen(path), suffix_len = strlen(suffix);
|
|
|
|
while (suffix_len) {
|
|
if (!path_len)
|
|
return NULL;
|
|
|
|
if (is_dir_sep(path[path_len - 1])) {
|
|
if (!is_dir_sep(suffix[suffix_len - 1]))
|
|
return NULL;
|
|
path_len = chomp_trailing_dir_sep(path, path_len);
|
|
suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
|
|
}
|
|
else if (path[--path_len] != suffix[--suffix_len])
|
|
return NULL;
|
|
}
|
|
|
|
if (path_len && !is_dir_sep(path[path_len - 1]))
|
|
return NULL;
|
|
return strndup(path, chomp_trailing_dir_sep(path, path_len));
|
|
}
|