Move the string parser with regexp from huawei plugin to generic utility function.

It's useful for other modems too that need to strip unsolicited messages from
responses.

3 files changed, 77 insertions, 1 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 8896e47e..b8fe2894 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -36,7 +36,9 @@ modem_manager_SOURCES = \
 	mm-serial.c \
 	mm-serial.h \
 	mm-serial-parsers.c \
-	mm-serial-parsers.h
+	mm-serial-parsers.h \
+	mm-util.c \
+	mm-util.h
 
 mm-manager-glue.h: $(top_srcdir)/introspection/mm-manager.xml
 	dbus-binding-tool --prefix=mm_manager --mode=glib-server --output=$@ $<
diff --git a/src/mm-util.c b/src/mm-util.c
new file mode 100644
index 00000000..33796ac6
--- /dev/null
+++ b/src/mm-util.c
@@ -0,0 +1,54 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+#include "mm-util.h"
+
+static gboolean
+remove_eval_cb (const GMatchInfo *match_info,
+                GString *result,
+                gpointer user_data)
+{
+    int *result_len = (int *) user_data;
+    int start;
+    int end;
+
+    if (g_match_info_fetch_pos  (match_info, 0, &start, &end))
+        *result_len -= (end - start);
+
+    return FALSE;
+}
+
+void
+mm_util_strip_string (GString *string,
+                      GRegex *regex,
+                      MMUtilStripFn callback,
+                      gpointer user_data)
+{
+    GMatchInfo *match_info;
+    gboolean matches;
+    char *str;
+
+    matches = g_regex_match_full (regex, string->str, string->len, 0, 0, &match_info, NULL);
+    if (callback) {
+        while (g_match_info_matches (match_info)) {
+            str = g_match_info_fetch (match_info, 1);
+            callback (str, user_data);
+            g_free (str);
+
+            g_match_info_next (match_info, NULL);
+        }
+    }
+
+    g_match_info_free (match_info);
+
+    if (matches) {
+        /* Remove matches */
+        int result_len = string->len;
+
+        str = g_regex_replace_eval (regex, string->str, string->len, 0, 0,
+                                    remove_eval_cb, &result_len, NULL);
+
+        g_string_truncate (string, 0);
+        g_string_append_len (string, str, result_len);
+        g_free (str);
+    }
+}
diff --git a/src/mm-util.h b/src/mm-util.h
new file mode 100644
index 00000000..049b5f94
--- /dev/null
+++ b/src/mm-util.h
@@ -0,0 +1,20 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+#ifndef MM_UTIL_H
+#define MM_UTIL_H
+
+#include <glib.h>
+
+typedef void (*MMUtilStripFn) (const char *str,
+                               gpointer user_data);
+
+/* Applies the regexp on string and calls the callback (if provided)
+   with each match and user_data. After that, the matches are removed
+   from the string.
+*/
+void mm_util_strip_string (GString *string,
+                           GRegex *regex,
+                           MMUtilStripFn callback,
+                           gpointer user_data);
+
+#endif /* MM_UTIL_H */