Root/tools/perf/util/abspath.c

1#include "cache.h"
2
3/*
4 * Do not use this for inspecting *tracked* content. When path is a
5 * symlink to a directory, we do not want to say it is a directory when
6 * dealing with tracked content in the working tree.
7 */
8static int is_directory(const char *path)
9{
10    struct stat st;
11    return (!stat(path, &st) && S_ISDIR(st.st_mode));
12}
13
14/* We allow "recursive" symbolic links. Only within reason, though. */
15#define MAXDEPTH 5
16
17const char *make_absolute_path(const char *path)
18{
19    static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
20    char cwd[1024] = "";
21    int buf_index = 1, len;
22
23    int depth = MAXDEPTH;
24    char *last_elem = NULL;
25    struct stat st;
26
27    if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
28        die ("Too long path: %.*s", 60, path);
29
30    while (depth--) {
31        if (!is_directory(buf)) {
32            char *last_slash = strrchr(buf, '/');
33            if (last_slash) {
34                *last_slash = '\0';
35                last_elem = xstrdup(last_slash + 1);
36            } else {
37                last_elem = xstrdup(buf);
38                *buf = '\0';
39            }
40        }
41
42        if (*buf) {
43            if (!*cwd && !getcwd(cwd, sizeof(cwd)))
44                die ("Could not get current working directory");
45
46            if (chdir(buf))
47                die ("Could not switch to '%s'", buf);
48        }
49        if (!getcwd(buf, PATH_MAX))
50            die ("Could not get current working directory");
51
52        if (last_elem) {
53            len = strlen(buf);
54
55            if (len + strlen(last_elem) + 2 > PATH_MAX)
56                die ("Too long path name: '%s/%s'",
57                        buf, last_elem);
58            buf[len] = '/';
59            strcpy(buf + len + 1, last_elem);
60            free(last_elem);
61            last_elem = NULL;
62        }
63
64        if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
65            len = readlink(buf, next_buf, PATH_MAX);
66            if (len < 0)
67                die ("Invalid symlink: %s", buf);
68            if (PATH_MAX <= len)
69                die("symbolic link too long: %s", buf);
70            next_buf[len] = '\0';
71            buf = next_buf;
72            buf_index = 1 - buf_index;
73            next_buf = bufs[buf_index];
74        } else
75            break;
76    }
77
78    if (*cwd && chdir(cwd))
79        die ("Could not change back to '%s'", cwd);
80
81    return buf;
82}
83
84static const char *get_pwd_cwd(void)
85{
86    static char cwd[PATH_MAX + 1];
87    char *pwd;
88    struct stat cwd_stat, pwd_stat;
89    if (getcwd(cwd, PATH_MAX) == NULL)
90        return NULL;
91    pwd = getenv("PWD");
92    if (pwd && strcmp(pwd, cwd)) {
93        stat(cwd, &cwd_stat);
94        if (!stat(pwd, &pwd_stat) &&
95            pwd_stat.st_dev == cwd_stat.st_dev &&
96            pwd_stat.st_ino == cwd_stat.st_ino) {
97            strlcpy(cwd, pwd, PATH_MAX);
98        }
99    }
100    return cwd;
101}
102
103const char *make_nonrelative_path(const char *path)
104{
105    static char buf[PATH_MAX + 1];
106
107    if (is_absolute_path(path)) {
108        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
109            die("Too long path: %.*s", 60, path);
110    } else {
111        const char *cwd = get_pwd_cwd();
112        if (!cwd)
113            die("Cannot determine the current working directory");
114        if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX)
115            die("Too long path: %.*s", 60, path);
116    }
117    return buf;
118}
119

Archive Download this file



interactive