[Libguestfs] [PATCH 1/4] utils: add a function to validate a GUID string
---
src/guestfs-internal.h | 3 +++
src/test-utils.c | 14 ++++++++++++++
src/utils.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 61 insertions(+)
diff --git a/src/guestfs-internal.h b/src/guestfs-internal.h
index 3752f79..545146f 100644
--- a/src/guestfs-internal.h
+++ b/src/guestfs-internal.h
@@ -833,4 +833,7 @@ extern void guestfs___cleanup_cmd_close (struct command **);
/* launch-direct.c */
extern char *guestfs___drive_source_qemu_param (guestfs_h *g, const struct drive_source
*src);
+/* utils.c */
+extern int guestfs___validate_guid (const char *);
+
#endif /* GUESTFS_INTERNAL_H_ */
diff --git a/src/test-utils.c b/src/test-utils.c
index 8ee2873..089d6b8 100644
--- a/src/test-utils.c
+++ b/src/test-utils.c
@@ -24,6 +24,7 @@
#include <assert.h>
#include "guestfs.h"
+#include "guestfs-internal.h"
#include "guestfs-internal-frontend.h"
/* Test guestfs___split_string. */
@@ -145,12 +146,25 @@ test_join (void)
free (ret);
}
+/* Test guestfs___validate_guid. */
+static void
+test_validate_guid (void)
+{
+ assert (guestfs___validate_guid ("") == 0);
+ assert (guestfs___validate_guid ("1") == 0);
+ assert (guestfs___validate_guid ("21EC20203AEA1069A2DD08002B30309D") == 0);
+
+ assert (guestfs___validate_guid ("{21EC2020-3AEA-1069-A2DD-08002B30309D}") ==
1);
+ assert (guestfs___validate_guid ("21EC2020-3AEA-1069-A2DD-08002B30309D") ==
1);
+}
+
int
main (int argc, char *argv[])
{
test_split ();
test_concat ();
test_join ();
+ test_validate_guid ();
exit (EXIT_SUCCESS);
}
diff --git a/src/utils.c b/src/utils.c
index 5eebdf6..45adc3d 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -28,7 +28,10 @@
#include <sys/wait.h>
#include <libintl.h>
+#include "c-ctype.h"
+
#include "guestfs.h"
+#include "guestfs-internal.h"
#include "guestfs-internal-frontend.h"
/* Note that functions in libutils are used by the tools and language
@@ -268,3 +271,44 @@ guestfs___drive_name (size_t index, char *ret)
*ret = '\0';
return ret;
}
+
+/* Check whether a string supposed to contain a GUID actually contains it.
+ * It can recognize strings either as '{21EC2020-3AEA-1069-A2DD-08002B30309D}'
+ * or '21EC2020-3AEA-1069-A2DD-08002B30309D'.
+ */
+int
+guestfs___validate_guid (const char *str)
+{
+ int len = strlen (str);
+ switch (len) {
+ case 36:
+ break;
+ case 38:
+ if (str[0] == '{' && str[len -1] == '}') {
+ ++str;
+ len -= 2;
+ break;
+ }
+ return 0;
+ default:
+ return 0;
+ }
+
+ for (int i = 0; i < len; ++i) {
+ switch (i) {
+ case 8:
+ case 13:
+ case 18:
+ case 23:
+ if (str[i] != '-')
+ return 0;
+ break;
+ default:
+ if (!c_isalnum (str[i]))
+ return 0;
+ break;
+ }
+ }
+
+ return 1;
+}
--
1.8.3.1