// SPDX-License-Identifier: GPL-2.0/* * 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 "path.h"#include "cache.h"#include <linux/kernel.h>#include <limits.h>#include <stdio.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <dirent.h>#include <unistd.h> static char bad_path[] = "/bad-path/";/* * One hack: */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;} 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);} int path__join(char *bf, size_t size, const char *path1, const char *path2){	return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);} int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3){	return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",			 path2, path2[0] ? "/" : "", path3);} bool is_regular_file(const char *file){	struct stat st; 	if (stat(file, &st))		return false; 	return S_ISREG(st.st_mode);} /* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */bool is_directory(const char *base_path, const struct dirent *dent){	char path[PATH_MAX];	struct stat st; 	sprintf(path, "%s/%s", base_path, dent->d_name);	if (stat(path, &st))		return false; 	return S_ISDIR(st.st_mode);}