+/* app_dirname section */
+
+/*
+ * This exactly follows what POSIX's
+ * dirname does, but is implemented
+ * in a more platform independent way.
+ *
+ * path dirname
+ * /usr/lib /usr
+ * /usr/ /
+ * usr .
+ * / /
+ * . .
+ * .. .
+ * "" .
+ *
+ * Note: this function also keeps the
+ * possibility of modifying the 'path'
+ * string same as POSIX dirname.
+ */
+static char *posix_dirname(char *path)
+{
+ size_t l;
+ char *ret = ".";
+
+ l = strlen(path);
+ if (l == 0)
+ goto out;
+ if (strcmp(path, ".") == 0)
+ goto out;
+ if (strcmp(path, "..") == 0)
+ goto out;
+ if (strcmp(path, "/") == 0) {
+ ret = "/";
+ goto out;
+ }
+ if (path[l - 1] == '/') {
+ /* /usr/ */
+ path[l - 1] = '\0';
+ }
+ if ((ret = strrchr(path, '/')) == NULL) {
+ /* usr */
+ ret = ".";
+ } else if (ret == path) {
+ /* /usr */
+ *++ret = '\0';
+ ret = path;
+ } else {
+ /* /usr/lib */
+ *ret = '\0';
+ ret = path;
+ }
+ out:
+ return ret;
+}
+
+/*
+ * TODO: implement app_dirname for Windows.
+ */
+#if !defined(_WIN32)
+char *app_dirname(char *path)
+{
+ return posix_dirname(path);
+}
+#elif defined(__VMS)
+/*
+ * sys$filescan fills the given item list with pointers into the original
+ * path string, so all we need to do is to find the file name and simply
+ * put a NUL byte wherever the FSCN$_NAME pointer points. If there is no
+ * file name part and the path string isn't the empty string, we know for
+ * a fact that the whole string is a directory spec and return it as is.
+ * Otherwise or if that pointer is the starting address of the original
+ * path string, we know to return "sys$disk:[]", which corresponds to the
+ * Unixly ".".
+ *
+ * If sys$filescan returns an error status, we know that this is not
+ * parsable as a VMS file spec, and then use the fallback, in case we
+ * have a Unix type path.
+ */
+char *app_dirname(char *path)
+{
+ char *ret = "sys$disk:[]";
+ struct dsc$descriptor_s dsc_path = { 0 };
+ ile2 itemlist[] = {
+ {0, FSCN$_NAME, 0},
+ {0, 0, 0}
+ };
+ int fields;
+ int status;
+
+ dsc_path.dsc$a_pointer = path;
+ dsc_path.dsc$w_length = strlen(path);
+ status = sys$filescan(&dsc_path, itemlist, &fields, 0, 0);
+
+ if (!(status & 1))
+ return posix_dirname(path);
+
+ if ((fields & (1 << FSCN$_NAME)) == 0) {
+ if (dsc_path.dsc$w_length != 0)
+ ret = path;
+ } else if (itemlist[0].ile2$ps_bufaddr != path) {
+ if (itemlist[0].ile2$ps_bufaddr != path) {
+ *itemlist[0].ile2$ps_bufaddr = '\0';
+ ret = path;
+ }
+ }
+ return ret;
+}
+#endif
+
projects / openssl.git / blobdiff