VBoot Reference: Output debug information using debug() instead of fprintf().

src/platform/vboot_reference/misclibs/file_keys.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Utility functions for file and key handling.
  */
 
 #include "file_keys.h"
 
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "cryptolib.h"
 #include "signature_digest.h"
 #include "utility.h"
 
 uint8_t* BufferFromFile(const char* input_file, uint64_t* len) {
   int fd;
   struct stat stat_fd;
   uint8_t* buf = NULL;
 
   if ((fd = open(input_file, O_RDONLY)) == -1) {
-    fprintf(stderr, "Couldn't open file.\n");
+    debug("Couldn't open file.\n");
     return NULL;
   }
 
   if (-1 == fstat(fd, &stat_fd)) {
-    fprintf(stderr, "Couldn't stat key file\n");
+    debug("Couldn't stat key file\n");
     return NULL;
   }
   *len = stat_fd.st_size;
 
   /* Read entire key binary blob into a buffer. */
   buf = (uint8_t*) Malloc(*len);
   if (!buf)
     return NULL;
 
   if (*len != read(fd, buf, *len)) {
-    fprintf(stderr, "Couldn't read key into a buffer.\n");
+    debug("Couldn't read key into a buffer.\n");
     return NULL;
   }
 
   close(fd);
   return buf;
 }
 
 RSAPublicKey* RSAPublicKeyFromFile(const char* input_file) {
   uint64_t len;
   RSAPublicKey* key = NULL;
@@ skipping 41 matching lines @@
              2 + 1 + /* For [algorithm]. */
              strlen(key_file) + 1 + /* +1 for space. */
              strlen(input_file) +
              1);  /* For the trailing '\0'. */
   cmd = (char*) Malloc(cmd_len);
   snprintf(cmd, cmd_len, "%s %d %s %s", sign_utility, algorithm, key_file,
            input_file);
   cmd_out = popen(cmd, "r");
   Free(cmd);
   if (!cmd_out) {
-    fprintf(stderr, "Couldn't execute: %s\n", cmd);
+    debug("Couldn't execute: %s\n", cmd);
     return NULL;
   }
 
   signature = (uint8_t*) Malloc(signature_size);
   if (fread(signature, signature_size, 1, cmd_out) != 1) {
-    fprintf(stderr, "Couldn't read signature.\n");
+    debug("Couldn't read signature.\n");
     pclose(cmd_out);
     Free(signature);
     return NULL;
   }
 
   pclose(cmd_out);
   return signature;
 }