df: Add --uuid option to print guest UUIDs instead of names (RHBZ#646821).

[libguestfs.git] / daemon / strings.c

diff --git a/daemon/strings.c b/daemon/strings.c
index 5e9c3a8..f08401b 100644 (file)
--- a/daemon/strings.c
+++ b/daemon/strings.c
@@ -1,5 +1,5 @@
 /* libguestfs - the guestfsd daemon
- * Copyright (C) 2009 Red Hat Inc. 
+ * 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
@@ -21,6 +21,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
 
 #include "daemon.h"
 #include "actions.h"
@@ -28,30 +30,29 @@
 char **
 do_strings_e (const char *encoding, const char *path)
 {
-  int len;
-  char *buf;
-  int r;
+  int fd, flags, r;
   char *out, *err;
-  char **lines = NULL;
-  int size = 0, alloc = 0;
-  char *p, *pend;
+  char **lines;
 
-  NEED_ROOT (NULL);
-  ABS_PATH (path, NULL);
-
-  len = strlen (path) + 9;
-  buf = malloc (len);
-  if (!buf) {
-    reply_with_perror ("malloc");
+  if (strlen (encoding) != 1 ||
+      strchr ("sSblBL", encoding[0]) == NULL) {
+    reply_with_error ("%s: invalid encoding", encoding);
     return NULL;
   }
 
-  snprintf (buf, len, "/sysroot%s", path);
+  CHROOT_IN;
+  fd = open (path, O_RDONLY);
+  CHROOT_OUT;
+
+  if (fd == -1) {
+    reply_with_perror ("%s", path);
+    return NULL;
+  }
 
-  r = command (&out, &err, "strings", "-e", encoding, buf, NULL);
-  free (buf);
+  flags = COMMAND_FLAG_CHROOT_COPY_FILE_TO_STDIN | fd;
+  r = commandf (&out, &err, flags, "strings", "-e", encoding, NULL);
   if (r == -1) {
-    reply_with_error ("strings: %s: %s", path, err);
+    reply_with_error ("%s: %s", path, err);
     free (err);
     free (out);
     return NULL;
@@ -60,25 +61,10 @@ do_strings_e (const char *encoding, const char *path)
   free (err);
 
   /* Now convert the output to a list of lines. */
-  p = out;
-  while (p && *p) {
-    pend = strchr (p, '\n');
-    if (pend) {
-      *pend = '\0';
-      pend++;
-    }
-
-    if (add_string (&lines, &size, &alloc, p) == -1) {
-      free (out);
-      return NULL;
-    }
-
-    p = pend;
-  }
-
+  lines = split_lines (out);
   free (out);
 
-  if (add_string (&lines, &size, &alloc, NULL) == -1)
+  if (lines == NULL)
     return NULL;
 
   return lines;                        /* Caller frees. */