Move underscore escaping/unscaping function to strutil.c;

Update decoding of IS-801 Request GPS Acquisition Assistance

svn path=/trunk/; revision=31685

1 files changed, 56 insertions, 0 deletions

diff --git a/epan/strutil.c b/epan/strutil.c
index b2a77f54c7..f6b9b9e4d7 100644
--- a/epan/strutil.c
+++ b/epan/strutil.c
@@ -1077,3 +1077,59 @@ IA5_7BIT_decode(unsigned char * dest, const unsigned char* src, int len)
     return;
 }
 
+/*
+ * This function takes a string and copies it, inserting an underscore before
+ * every underscore in it.
+ */
+gchar*
+ws_strdup_escape_underscore (const gchar *str)
+{
+	gchar *p, *q, *new_str;
+
+	if(!str)
+		return NULL;
+
+	p = (gchar *)str;
+	/* Worst case: A string that is full of underscores */
+	q = new_str = g_malloc (strlen(str) * 2 + 1);
+
+	while(*p != 0)
+	{
+		if(*p == '_')
+			*q++ = '_';
+
+		*q++ = *p++;
+	}
+	*q++ = '\0';
+
+	return new_str;
+}
+
+/*
+ * This function takes a string and copies it, removing any occurences of double
+ * underscores with a single underscore.
+ */
+gchar*
+ws_strdup_unescape_underscore (const gchar *str)
+{
+	gchar *p, *q, *new_str;
+
+	if(!str)
+		return NULL;
+
+	p = (gchar *)str;
+	/* Worst case: A string that contains no underscores */
+	q = new_str = g_malloc (strlen(str) + 1);
+
+	while(*p != 0)
+	{
+		*q++ = *p;
+		if ((*p == '_') && (*(p+1) == '_'))
+			p += 2;
+		else
+			p++;
+	}
+	*q++ = '\0';
+
+	return new_str;
+}