1 files changed, 117 insertions, 0 deletions

diff --git a/tools/perf/util/abspath.c b/tools/perf/util/abspath.c
new file mode 100644
index 000000000000..61d33b81fc97
--- /dev/null
+++ b/tools/perf/util/abspath.c
@@ -0,0 +1,117 @@
+#include "cache.h"
+
+/*
+ * Do not use this for inspecting *tracked* content.  When path is a
+ * symlink to a directory, we do not want to say it is a directory when
+ * dealing with tracked content in the working tree.
+ */
+static int is_directory(const char *path)
+{
+        struct stat st;
+        return (!stat(path, &st) && S_ISDIR(st.st_mode));
+}
+
+/* We allow "recursive" symbolic links. Only within reason, though. */
+#define MAXDEPTH 5
+
+const char *make_absolute_path(const char *path)
+{
+        static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
+        char cwd[1024] = "";
+        int buf_index = 1, len;
+
+        int depth = MAXDEPTH;
+        char *last_elem = NULL;
+        struct stat st;
+
+        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
+                die ("Too long path: %.*s", 60, path);
+
+        while (depth--) {
+                if (!is_directory(buf)) {
+                        char *last_slash = strrchr(buf, '/');
+                        if (last_slash) {
+                                *last_slash = '\0';
+                                last_elem = xstrdup(last_slash + 1);
+                        } else {
+                                last_elem = xstrdup(buf);
+                                *buf = '\0';
+                        }
+                }
+
+                if (*buf) {
+                        if (!*cwd && !getcwd(cwd, sizeof(cwd)))
+                                die ("Could not get current working directory");
+
+                        if (chdir(buf))
+                                die ("Could not switch to '%s'", buf);
+                }
+                if (!getcwd(buf, PATH_MAX))
+                        die ("Could not get current working directory");
+
+                if (last_elem) {
+                        int len = strlen(buf);
+                        if (len + strlen(last_elem) + 2 > PATH_MAX)
+                                die ("Too long path name: '%s/%s'",
+                                                buf, last_elem);
+                        buf[len] = '/';
+                        strcpy(buf + len + 1, last_elem);
+                        free(last_elem);
+                        last_elem = NULL;
+                }
+
+                if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
+                        len = readlink(buf, next_buf, PATH_MAX);
+                        if (len < 0)
+                                die ("Invalid symlink: %s", buf);
+                        if (PATH_MAX <= len)
+                                die("symbolic link too long: %s", buf);
+                        next_buf[len] = '\0';
+                        buf = next_buf;
+                        buf_index = 1 - buf_index;
+                        next_buf = bufs[buf_index];
+                } else
+                        break;
+        }
+
+        if (*cwd && chdir(cwd))
+                die ("Could not change back to '%s'", cwd);
+
+        return buf;
+}
+
+static const char *get_pwd_cwd(void)
+{
+        static char cwd[PATH_MAX + 1];
+        char *pwd;
+        struct stat cwd_stat, pwd_stat;
+        if (getcwd(cwd, PATH_MAX) == NULL)
+                return NULL;
+        pwd = getenv("PWD");
+        if (pwd && strcmp(pwd, cwd)) {
+                stat(cwd, &cwd_stat);
+                if (!stat(pwd, &pwd_stat) &&
+                    pwd_stat.st_dev == cwd_stat.st_dev &&
+                    pwd_stat.st_ino == cwd_stat.st_ino) {
+                        strlcpy(cwd, pwd, PATH_MAX);
+                }
+        }
+        return cwd;
+}
+
+const char *make_nonrelative_path(const char *path)
+{
+        static char buf[PATH_MAX + 1];
+
+        if (is_absolute_path(path)) {
+                if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
+                        die("Too long path: %.*s", 60, path);
+        } else {
+                const char *cwd = get_pwd_cwd();
+                if (!cwd)
+                        die("Cannot determine the current working directory");
+                if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX)
+                        die("Too long path: %.*s", 60, path);
+        }
+        return buf;
+}