From 55e6ccb23e0b1f954107b4d0284d3d41f7a4e7b8 Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Sat, 13 Nov 2010 14:39:21 +0000
Subject: [PATCH] lib: Add match3 function.

---
 src/guestfs-internal.h |  2 ++
 src/inspect.c          | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/src/guestfs-internal.h b/src/guestfs-internal.h
index 5ac4dcf..299cf74 100644
--- a/src/guestfs-internal.h
+++ b/src/guestfs-internal.h
@@ -257,6 +257,7 @@ extern void guestfs___print_BufferIn (FILE *out, const char *buf, size_t buf_siz
 extern int guestfs___match (guestfs_h *g, const char *str, const pcre *re);
 extern char *guestfs___match1 (guestfs_h *g, const char *str, const pcre *re);
 extern int guestfs___match2 (guestfs_h *g, const char *str, const pcre *re, char **ret1, char **ret2);
+extern int guestfs___match3 (guestfs_h *g, const char *str, const pcre *re, char **ret1, char **ret2, char **ret3);
 #endif
 extern int guestfs___feature_available (guestfs_h *g, const char *feature);
 extern void guestfs___free_string_list (char **);
@@ -276,6 +277,7 @@ extern void guestfs___rollback_cmdline (guestfs_h *g, int pos);
 #define match guestfs___match
 #define match1 guestfs___match1
 #define match2 guestfs___match2
+#define match3 guestfs___match3
 #endif
 
 #endif /* GUESTFS_INTERNAL_H_ */
diff --git a/src/inspect.c b/src/inspect.c
index 3b2720c..f5e4490 100644
--- a/src/inspect.c
+++ b/src/inspect.c
@@ -1526,4 +1526,29 @@ guestfs___match2 (guestfs_h *g, const char *str, const pcre *re,
   return 1;
 }
 
+/* Match a regular expression which contains exactly three captures. */
+int
+guestfs___match3 (guestfs_h *g, const char *str, const pcre *re,
+                  char **ret1, char **ret2, char **ret3)
+{
+  size_t len = strlen (str);
+  int vec[30], r;
+
+  r = pcre_exec (re, NULL, str, len, 0, 0, vec, 30);
+  if (r == PCRE_ERROR_NOMATCH)
+    return 0;
+  if (r != 4) {
+    /* Internal error -- should not happen. */
+    fprintf (stderr, "libguestfs: %s: %s: internal error: pcre_exec returned unexpected error code %d when matching against the string \"%s\"\n",
+             __FILE__, __func__, r, str);
+    return 0;
+  }
+
+  *ret1 = safe_strndup (g, &str[vec[2]], vec[3]-vec[2]);
+  *ret2 = safe_strndup (g, &str[vec[4]], vec[5]-vec[4]);
+  *ret3 = safe_strndup (g, &str[vec[6]], vec[7]-vec[6]);
+
+  return 1;
+}
+
 #endif /* HAVE_PCRE */
-- 
1.8.3.1