Implement "more" and "less" commands in guestfish.

[libguestfs.git] / fish / more.c

diff --git a/fish/more.c b/fish/more.c
new file mode 100644 (file)
index 0000000..8bc9d95
--- /dev/null
+++ b/fish/more.c
@@ -0,0 +1,93 @@
+/* guestfish - the filesystem interactive shell
+ * Copyright (C) 2009 Red Hat Inc. 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <inttypes.h>
+
+#include "fish.h"
+
+int
+do_more (const char *cmd, int argc, char *argv[])
+{
+  char filename[] = "/tmp/guestfishXXXXXX";
+  char buf[256];
+  const char *pager;
+  char *content;
+  int r, fd;
+
+  if (argc != 1) {
+    fprintf (stderr, _("use '%s filename' to page a file\n"), cmd);
+    return -1;
+  }
+
+  /* Choose a pager. */
+  if (strcasecmp (cmd, "less") == 0)
+    pager = "less";
+  else {
+    pager = getenv ("PAGER");
+    if (pager == NULL)
+      pager = "more";
+  }
+
+  /* Download the file and write it to a temporary. */
+  fd = mkstemp (filename);
+  if (fd == -1) {
+    perror ("mkstemp");
+    return -1;
+  }
+
+  if ((content = guestfs_cat (g, argv[0])) == NULL) {
+    close (fd);
+    unlink (filename);
+    return -1;
+  }
+
+  if (xwrite (fd, content, strlen (content)) == -1) {
+    close (fd);
+    unlink (filename);
+    free (content);
+    return -1;
+  }
+
+  free (content);
+
+  if (close (fd) == -1) {
+    perror (filename);
+    unlink (filename);
+    return -1;
+  }
+
+  /* View it. */
+  /* XXX Safe? */
+  snprintf (buf, sizeof buf, "%s %s", pager, filename);
+
+  r = system (buf);
+  unlink (filename);
+  if (r != 0) {
+    perror (buf);
+    return -1;
+  }
+
+  return 0;
+}