inspect: Move shared PCRE match functions to separate file.

[libguestfs.git] / src / match.c

diff --git a/src/match.c b/src/match.c
new file mode 100644 (file)
index 0000000..c007885
--- /dev/null
+++ b/src/match.c
@@ -0,0 +1,127 @@
+/* libguestfs
+ * Copyright (C) 2010-2011 Red Hat Inc.
+ *
+ * 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 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 <stdio.h>
+#include <stdlib.h>
+
+#ifdef HAVE_PCRE
+#include <pcre.h>
+#endif
+
+#include "guestfs.h"
+#include "guestfs-internal.h"
+
+#ifdef HAVE_PCRE
+
+/* Match a regular expression which contains no captures.  Returns
+ * true if it matches or false if it doesn't.
+ */
+int
+guestfs___match (guestfs_h *g, const char *str, const pcre *re)
+{
+  size_t len = strlen (str);
+  int vec[30], r;
+
+  r = pcre_exec (re, NULL, str, len, 0, 0, vec, sizeof vec / sizeof vec[0]);
+  if (r == PCRE_ERROR_NOMATCH)
+    return 0;
+  if (r != 1) {
+    /* Internal error -- should not happen. */
+    warning (g, "%s: %s: pcre_exec returned unexpected error code %d when matching against the string \"%s\"\n",
+             __FILE__, __func__, r, str);
+    return 0;
+  }
+
+  return 1;
+}
+
+/* Match a regular expression which contains exactly one capture.  If
+ * the string matches, return the capture, otherwise return NULL.  The
+ * caller must free the result.
+ */
+char *
+guestfs___match1 (guestfs_h *g, const char *str, const pcre *re)
+{
+  size_t len = strlen (str);
+  int vec[30], r;
+
+  r = pcre_exec (re, NULL, str, len, 0, 0, vec, sizeof vec / sizeof vec[0]);
+  if (r == PCRE_ERROR_NOMATCH)
+    return NULL;
+  if (r != 2) {
+    /* Internal error -- should not happen. */
+    warning (g, "%s: %s: internal error: pcre_exec returned unexpected error code %d when matching against the string \"%s\"",
+             __FILE__, __func__, r, str);
+    return NULL;
+  }
+
+  return safe_strndup (g, &str[vec[2]], vec[3]-vec[2]);
+}
+
+/* Match a regular expression which contains exactly two captures. */
+int
+guestfs___match2 (guestfs_h *g, const char *str, const pcre *re,
+                  char **ret1, char **ret2)
+{
+  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 != 3) {
+    /* Internal error -- should not happen. */
+    warning (g, "%s: %s: internal error: pcre_exec returned unexpected error code %d when matching against the string \"%s\"",
+             __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]);
+
+  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. */
+    warning (g, "%s: %s: internal error: pcre_exec returned unexpected error code %d when matching against the string \"%s\"",
+             __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 */