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