Fix: utils_expand_path now works for paths that ends with '/.' or '/..'

[lttng-tools.git] / src / common / utils.c

diff --git a/src/common/utils.c b/src/common/utils.c
index 330c04e82916359053981b69025c9f6339ab1a1f..ce25f232d5209b7c08b644ce21a7fa526d70a244 100644 (file)
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -178,6 +178,8 @@ LTTNG_HIDDEN
 char *utils_expand_path(const char *path)
 {
        char *next, *previous, *slash, *start_path, *absolute_path = NULL;
+       char *last_token;
+       int is_dot, is_dotdot;
 
        /* Safety net */
        if (path == NULL) {
@@ -241,6 +243,31 @@ char *utils_expand_path(const char *path)
                                absolute_path, PATH_MAX);
        }
 
+       /* Identify the last token */
+       last_token = strrchr(absolute_path, '/');
+
+       /* Verify that this token is not a relative path */
+       is_dotdot = (strcmp(last_token, "/..") == 0);
+       is_dot = (strcmp(last_token, "/.") == 0);
+
+       /* If it is, take action */
+       if (is_dot || is_dotdot) {
+               /* For both, remove this token */
+               *last_token = '\0';
+
+               /* If it was a reference to parent directory, go back one more time */
+               if (is_dotdot) {
+                       last_token = strrchr(absolute_path, '/');
+
+                       /* If there was only one level left, we keep the first '/' */
+                       if (last_token == absolute_path) {
+                               last_token++;
+                       }
+
+                       *last_token = '\0';
+               }
+       }
+
        return absolute_path;
 
 error: