Fix C89 compile error for cpu detect. Make mips detection assume DSP if cpuinfo…

Fix C89 compile error for cpu detect.  Make mips detection assume DSP if cpuinfo file can not be opened, so that if run in a sandbox, DSP is assumed true, like the arm version.
BUG=303
TESTED=cl /c /TC /Iinclude source/cpu_id.cc
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/10549004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@986 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 985
+Version: 986
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 985
+#define LIBYUV_VERSION 986
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/cpu_id.cc

@@ -120,13 +120,13 @@ void CpuId(uint32 eax, uint32 ecx, uint32* cpu_info) {
 // For Arm, but public to allow testing on any CPU
 LIBYUV_API SAFEBUFFERS
 int ArmCpuCaps(const char* cpuinfo_name) {
+  char cpuinfo_line[512];
   FILE* f = fopen(cpuinfo_name, "r");
   if (!f) {
     // Assume Neon if /proc/cpuinfo is unavailable.
     // This will occur for Chrome sandbox for Pepper or Render process.
     return kCpuHasNEON;
   }
-  char cpuinfo_line[512];
   while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f)) {
     if (memcmp(cpuinfo_line, "Features", 8) == 0) {
       char* p = strstr(cpuinfo_line, " neon");
@@ -142,10 +142,14 @@ int ArmCpuCaps(const char* cpuinfo_name) {
 
 #if defined(__mips__) && defined(__linux__)
 static int MipsCpuCaps(const char* search_string) {
+  char cpuinfo_line[512];
   const char* file_name = "/proc/cpuinfo";
-  char cpuinfo_line[256];
-  FILE* f = NULL;
-  if ((f = fopen(file_name, "r")) != NULL) {
+  FILE* f = fopen(file_name, "r");
+  if (!f) {
+    // Assume DSP if /proc/cpuinfo is unavailable.
+    // This will occur for Chrome sandbox for Pepper or Render process.
+    return kCpuHasMIPS_DSP;
+  }
   while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f) != NULL) {
     if (strstr(cpuinfo_line, search_string) != NULL) {
       fclose(f);
@@ -153,8 +157,6 @@ static int MipsCpuCaps(const char* search_string) {
     }
   }
   fclose(f);
-  }
-  /* Did not find string in the proc file, or not Linux ELF. */
   return 0;
 }
 #endif