1 files changed, 111 insertions, 0 deletions
diff --git a/src/libnm-glib-aux/nm-shared-utils.c b/src/libnm-glib-aux/nm-shared-utils.c
index 7d623bd9..421e4d1b 100644
--- a/src/libnm-glib-aux/nm-shared-utils.c
+++ b/src/libnm-glib-aux/nm-shared-utils.c
@@ -7330,3 +7330,114 @@ nm_utils_poll_finish(GAsyncResult *result, gpointer *probe_user_data, GError **e
 
     return g_task_propagate_boolean(task, error);
 }
+
+/*****************************************************************************/
+
+void
+nm_utils_env_var_encode_name(const char *key, GString *str_buffer)
+{
+    gsize i;
+
+    nm_assert(key);
+    nm_assert(str_buffer);
+
+    for (i = 0; key[i]; i++) {
+        char ch = key[i];
+
+        /* we encode the key in only upper case letters, digits, and underscore.
+         * As we expect lower-case letters to be more common, we encode lower-case
+         * letters as upper case, and upper-case letters with a leading underscore. */
+
+        if (ch >= '0' && ch <= '9') {
+            g_string_append_c(str_buffer, ch);
+            continue;
+        }
+        if (ch >= 'a' && ch <= 'z') {
+            g_string_append_c(str_buffer, ch - 'a' + 'A');
+            continue;
+        }
+        if (ch == '.') {
+            g_string_append(str_buffer, "__");
+            continue;
+        }
+        if (ch >= 'A' && ch <= 'Z') {
+            g_string_append_c(str_buffer, '_');
+            g_string_append_c(str_buffer, ch);
+            continue;
+        }
+        g_string_append_printf(str_buffer, "_%03o", (unsigned) ch);
+    }
+}
+
+gboolean
+nm_utils_env_var_decode_name(const char *name, GString *str_buffer)
+{
+    gsize i;
+
+    nm_assert(name);
+    nm_assert(str_buffer);
+
+    if (!name[0])
+        return FALSE;
+
+    for (i = 0; name[i];) {
+        char ch = name[i];
+
+        if (ch >= '0' && ch <= '9') {
+            g_string_append_c(str_buffer, ch);
+            i++;
+            continue;
+        }
+        if (ch >= 'A' && ch <= 'Z') {
+            g_string_append_c(str_buffer, ch - 'A' + 'a');
+            i++;
+            continue;
+        }
+
+        if (ch == '_') {
+            ch = name[i + 1];
+            if (ch == '_') {
+                g_string_append_c(str_buffer, '.');
+                i += 2;
+                continue;
+            }
+            if (ch >= 'A' && ch <= 'Z') {
+                g_string_append_c(str_buffer, ch);
+                i += 2;
+                continue;
+            }
+            if (ch >= '0' && ch <= '7') {
+                char     ch2, ch3;
+                unsigned v;
+
+                ch2 = name[i + 2];
+                if (!(ch2 >= '0' && ch2 <= '7'))
+                    return FALSE;
+
+                ch3 = name[i + 3];
+                if (!(ch3 >= '0' && ch3 <= '7'))
+                    return FALSE;
+
+#define OCTAL_VALUE(ch) ((unsigned) ((ch) - '0'))
+                v = (OCTAL_VALUE(ch) << 6) + (OCTAL_VALUE(ch2) << 3) + OCTAL_VALUE(ch3);
+                if (v > 0xFF || v == 0)
+                    return FALSE;
+                ch = (char) v;
+                if ((ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9') || (ch == '.')
+                    || (ch >= 'a' && ch <= 'z')) {
+                    /* such characters are not expected to be encoded via
+                     * octal representation. The encoding is invalid. */
+                    return FALSE;
+                }
+                g_string_append_c(str_buffer, ch);
+                i += 4;
+                continue;
+            }
+            return FALSE;
+        }
+
+        return FALSE;
+    }
+
+    return TRUE;
+}