Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * I'm tired of doing "vsnprintf()" etc just to open a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * file, so here's a "return static buffer with printf"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * interface for paths.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * It's obviously not thread-safe. Sue me. But it's quite
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * useful for doing things like
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  *   f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * which is what it's designed for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "path.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "cache.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <limits.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <dirent.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static char bad_path[] = "/bad-path/";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)  * One hack:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static char *get_pathname(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	static char pathname_array[4][PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	static int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	return pathname_array[3 & ++idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static char *cleanup_path(char *path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	/* Clean it up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	if (!memcmp(path, "./", 2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		path += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		while (*path == '/')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 			path++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	return path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) char *mkpath(const char *fmt, ...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	va_list args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	unsigned len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	char *pathname = get_pathname();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	va_start(args, fmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	len = vsnprintf(pathname, PATH_MAX, fmt, args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	va_end(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	if (len >= PATH_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		return bad_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	return cleanup_path(pathname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) int path__join(char *bf, size_t size, const char *path1, const char *path2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 			 path2, path2[0] ? "/" : "", path3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) bool is_regular_file(const char *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	struct stat st;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	if (stat(file, &st))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	return S_ISREG(st.st_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) bool is_directory(const char *base_path, const struct dirent *dent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 	char path[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 	struct stat st;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) 	sprintf(path, "%s/%s", base_path, dent->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 	if (stat(path, &st))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) 	return S_ISDIR(st.st_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }