switching to erroror for internal functions, not complete

Author: uzairnawaz

libc/src/__support/OSUtil/linux/prctl.cpp

@@ -30,7 +30,7 @@ ErrorOr<int> prctl(int option, unsigned long arg2, unsigned long arg3,
   // return value from the syscall is set to 0 on default so we do not need to
   // set the value on success manually.
   if (ret < 0)
-    return Error(-ret);
+    return Error(static_cast<int>(-ret));
 
   return static_cast<int>(ret);
 }

libc/src/__support/OSUtil/prctl.h

@@ -12,6 +12,7 @@
 #include "src/__support/macros/config.h"
 #include "src/__support/error_or.h"
 #include <sys/prctl.h>
+#include "src/__support/libc_errno.h"
 
 namespace LIBC_NAMESPACE_DECL {
 namespace internal {

libc/src/__support/wchar/wcrtomb.cpp

@@ -0,0 +1,37 @@
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+    void utf32to8(char* out, wchar_t src) {
+        char u, v, w, x, y, z;
+        u = (src & (0xf << 20)) >> 20;
+        v = (src & (0xf << 16)) >> 16;
+        w = (src & (0xf << 12)) >> 12;
+        x = (src & (0xf <<  8)) >>  8;
+        y = (src & (0xf <<  4)) >>  4;
+        z = (src & (0xf <<  0)) >>  0;
+
+        if (src <= 0x7f) {
+            // 0yyyzzzz
+            out[0] = src;
+        }
+        else if (src <= 0x7ff) {
+            // 110xxxyy 10yyzzzz
+            out[0] = 0xC0 | (x << 2) | (y >> 2);
+            out[1] = 0x80 | ((y & 0x3) << 4) | z;
+        }
+        else if (src <= 0xffff) {
+            // 1110wwww 10xxxxyy 10yyzzzz
+            out[0] = 0xE0 | w;
+            out[1] = 0x80 | (x << 2) | (y >> 2);
+            out[2] = 0x80 | ((y & 0x3) << 4) | z;
+        }
+        else if (src <= 0x10ffff) {
+            // 11110uvv 10vvwwww 10xxxxyy 10yyzzzz
+            out[0] = 0xF0 | (u << 2) | (v >> 2);
+            out[1] = 0x80 | ((v & 0x3) << 4) | w;
+            out[2] = 0x80 | (x << 2) | (y >> 2);
+            out[3] = 0x80 | ((y & 0x3) << 4) | z;
+        }
+    }
+}
+}

libc/src/sys/auxv/linux/getauxval.cpp

@@ -31,7 +31,7 @@
 #include "src/__support/OSUtil/munmap.h"
 
 // for reading /proc/self/auxv
-#include "src/sys/prctl/prctl.h"
+#include "src/__support/OSUtil/prctl.h"
 #include "src/unistd/read.h"
 
 // getauxval will work either with or without __cxa_atexit support.
@@ -133,9 +133,9 @@ static void initialize_auxv_once(void) {
   // is compiled and run on separate kernels, we also check the return value of
   // prctl.
 #ifdef PR_GET_AUXV
-  int ret = prctl(PR_GET_AUXV, reinterpret_cast<unsigned long>(ptr),
+  auto ret = internal::prctl(PR_GET_AUXV, reinterpret_cast<unsigned long>(ptr),
                   available_size, 0, 0);
-  if (ret >= 0) {
+  if (ret.has_value()) {
     mmap_guard.submit_to_global();
     return;
   }

libc/src/sys/prctl/linux/CMakeLists.txt

@@ -6,7 +6,6 @@ add_entrypoint_object(
     ../prctl.h
   DEPENDS
     libc.include.sys_prctl
-    libc.include.sys_syscall
     libc.src.__support.OSUtil.osutil
     libc.src.errno.errno
 )