[tracker/rss-enclosures] libtracker-sparql: Added uri escape functions from libtracker-client

[Roberto Guido <rguido src gnome org>]

commit 1ca85874cea8fe1a4a785678f4fccb582d76abb7
Author: Martyn Russell <martyn lanedo com>
Date:   Thu Jul 15 11:22:43 2010 +0100

    libtracker-sparql: Added uri escape functions from libtracker-client

 src/libtracker-sparql/Makefile.am        |    3 +-
 src/libtracker-sparql/tracker-uri.c      |  259 ++++++++++++++++++++++++++++++
 src/libtracker-sparql/tracker-utils.vala |    4 +
 3 files changed, 265 insertions(+), 1 deletions(-)
---
diff --git a/src/libtracker-sparql/Makefile.am b/src/libtracker-sparql/Makefile.am
index fdaf172..ee7b504 100644
--- a/src/libtracker-sparql/Makefile.am
+++ b/src/libtracker-sparql/Makefile.am
@@ -23,7 +23,8 @@ libtracker_sparql_la_VALASOURCES = 			\
 
 libtracker_sparql_ TRACKER_API_VERSION@_la_SOURCES = 	\
 	libtracker-sparql.vala.stamp			\
-	$(libtracker_sparql_la_VALASOURCES:.vala=.c)
+	$(libtracker_sparql_la_VALASOURCES:.vala=.c) \
+	tracker-uri.c
 
 libtracker_sparql_ TRACKER_API_VERSION@_la_LDFLAGS = 	\
 	-version-info $(LT_CURRENT):$(LT_REVISION):$(LT_AGE)
diff --git a/src/libtracker-sparql/tracker-uri.c b/src/libtracker-sparql/tracker-uri.c
new file mode 100644
index 0000000..bbd330f
--- /dev/null
+++ b/src/libtracker-sparql/tracker-uri.c
@@ -0,0 +1,259 @@
+/*
+ * Copyright (C) 2008-2010, Nokia <ivan frade nokia com>
+ * Copyright (C) 2010, Codeminded BVBA <abustany gnome org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <glib.h>
+
+static const char *
+find_conversion (const char  *format,
+                 const char **after)
+{
+	const char *start = format;
+	const char *cp;
+
+	while (*start != '\0' && *start != '%')
+		start++;
+
+	if (*start == '\0') {
+		*after = start;
+		return NULL;
+	}
+
+	cp = start + 1;
+
+	if (*cp == '\0') {
+		*after = cp;
+		return NULL;
+	}
+
+	/* Test for positional argument.  */
+	if (*cp >= '0' && *cp <= '9') {
+		const char *np;
+
+		for (np = cp; *np >= '0' && *np <= '9'; np++)
+			;
+		if (*np == '$')
+			cp = np + 1;
+	}
+
+	/* Skip the flags.  */
+	for (;;) {
+		if (*cp == '\'' ||
+		    *cp == '-' ||
+		    *cp == '+' ||
+		    *cp == ' ' ||
+		    *cp == '#' ||
+		    *cp == '0')
+			cp++;
+		else
+			break;
+	}
+
+	/* Skip the field width.  */
+	if (*cp == '*') {
+		cp++;
+
+		/* Test for positional argument.  */
+		if (*cp >= '0' && *cp <= '9') {
+			const char *np;
+
+			for (np = cp; *np >= '0' && *np <= '9'; np++)
+				;
+			if (*np == '$')
+				cp = np + 1;
+		}
+	} else {
+		for (; *cp >= '0' && *cp <= '9'; cp++)
+			;
+	}
+
+	/* Skip the precision.  */
+	if (*cp == '.') {
+		cp++;
+		if (*cp == '*') {
+			/* Test for positional argument.  */
+			if (*cp >= '0' && *cp <= '9') {
+				const char *np;
+
+				for (np = cp; *np >= '0' && *np <= '9'; np++)
+					;
+				if (*np == '$')
+					cp = np + 1;
+			}
+		} else {
+			for (; *cp >= '0' && *cp <= '9'; cp++)
+				;
+		}
+	}
+
+	/* Skip argument type/size specifiers.  */
+	while (*cp == 'h' ||
+	       *cp == 'L' ||
+	       *cp == 'l' ||
+	       *cp == 'j' ||
+	       *cp == 'z' ||
+	       *cp == 'Z' ||
+	       *cp == 't')
+		cp++;
+
+	/* Skip the conversion character.  */
+	cp++;
+
+	*after = cp;
+	return start;
+}
+
+/**
+ * tracker_sparql_escape_uri_vprintf:
+ * @format: a standard printf() format string, but notice
+ *     <link linkend="string-precision">string precision pitfalls</link>
+ * @args: the list of parameters to insert into the format string
+ *
+ * Similar to the standard C vsprintf() function but safer, since it
+ * calculates the maximum space required and allocates memory to hold
+ * the result.
+ *
+ * The result is escaped using g_uri_escape_string().
+ *
+ * Returns: a newly-allocated string holding the result which should
+ * be freed with g_free() when finished with.
+ *
+ * Since: 0.8
+ */
+gchar *
+tracker_sparql_escape_uri_vprintf (const gchar *format,
+                                   va_list      args)
+{
+	GString *format1;
+	GString *format2;
+	GString *result = NULL;
+	gchar *output1 = NULL;
+	gchar *output2 = NULL;
+	const char *p;
+	gchar *op1, *op2;
+	va_list args2;
+
+	format1 = g_string_new (NULL);
+	format2 = g_string_new (NULL);
+	p = format;
+	while (TRUE) {
+		const char *after;
+		const char *conv = find_conversion (p, &after);
+		if (!conv)
+			break;
+
+		g_string_append_len (format1, conv, after - conv);
+		g_string_append_c (format1, 'X');
+		g_string_append_len (format2, conv, after - conv);
+		g_string_append_c (format2, 'Y');
+
+		p = after;
+	}
+
+	/* Use them to format the arguments
+	 */
+	G_VA_COPY (args2, args);
+
+	output1 = g_strdup_vprintf (format1->str, args);
+	va_end (args);
+	if (!output1) {
+		va_end (args2);
+		goto cleanup;
+	}
+
+	output2 = g_strdup_vprintf (format2->str, args2);
+	va_end (args2);
+	if (!output2)
+		goto cleanup;
+
+	result = g_string_new (NULL);
+
+	op1 = output1;
+	op2 = output2;
+	p = format;
+	while (TRUE) {
+		const char *after;
+		const char *output_start;
+		const char *conv = find_conversion (p, &after);
+		char *escaped;
+
+		if (!conv) {
+			g_string_append_len (result, p, after - p);
+			break;
+		}
+
+		g_string_append_len (result, p, conv - p);
+		output_start = op1;
+		while (*op1 == *op2) {
+			op1++;
+			op2++;
+		}
+
+		*op1 = '\0';
+		escaped = g_uri_escape_string (output_start, NULL, FALSE);
+		g_string_append (result, escaped);
+		g_free (escaped);
+
+		p = after;
+		op1++;
+		op2++;
+	}
+
+cleanup:
+	g_string_free (format1, TRUE);
+	g_string_free (format2, TRUE);
+	g_free (output1);
+	g_free (output2);
+
+	if (result)
+		return g_string_free (result, FALSE);
+	else
+		return NULL;
+}
+
+/**
+ * tracker_sparql_escape_uri_printf:
+ * @format: a standard printf() format string, but notice
+ *     <link linkend="string-precision">string precision pitfalls</link>
+ * @Varargs: the parameters to insert into the format string
+ *
+ * Calls tracker_sparql_escpae_uri_vprintf() with the @Varargs supplied.
+
+ * Returns: a newly-allocated string holding the result which should
+ * be freed with g_free() when finished with.
+ *
+ * Since: 0.8
+ **/
+gchar *
+tracker_sparql_escape_uri_printf (const gchar *format, ...)
+{
+	gchar *result;
+	va_list args;
+
+	va_start (args, format);
+	result = tracker_sparql_escape_uri_vprintf (format, args);
+	va_end (args);
+
+	return result;
+}
+
diff --git a/src/libtracker-sparql/tracker-utils.vala b/src/libtracker-sparql/tracker-utils.vala
index 198a3c5..9534fa2 100644
--- a/src/libtracker-sparql/tracker-utils.vala
+++ b/src/libtracker-sparql/tracker-utils.vala
@@ -17,6 +17,10 @@
  * Boston, MA  02110-1301, USA.
  */
 
+// Imported from tracker-uri.c
+public extern unowned string tracker_sparql_escape_uri_vprintf (string format, va_list args);
+public extern unowned string tracker_sparql_escape_uri_printf (string format, ...);
+
 public unowned string tracker_sparql_escape_string (string literal) {
 	StringBuilder str = new StringBuilder ();
 	char *p = literal;