Moved stdio and string functions to POSIX platform file

src/platform-posix.cc

Index: src/platform-posix.cc
===================================================================
--- src/platform-posix.cc	(revision 1621)
+++ src/platform-posix.cc	(working copy)
@@ -105,6 +105,77 @@
 
 
 // ----------------------------------------------------------------------------
+// POSIX stdio support.
+//
+
+FILE* OS::FOpen(const char* path, const char* mode) {
+  return fopen(path, mode);
+}
+
+
+void OS::Print(const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  VPrint(format, args);
+  va_end(args);
+}
+
+
+void OS::VPrint(const char* format, va_list args) {
+  vprintf(format, args);
+}
+
+
+void OS::PrintError(const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  VPrintError(format, args);
+  va_end(args);
+}
+
+
+void OS::VPrintError(const char* format, va_list args) {
+  vfprintf(stderr, format, args);
+}
+
+
+int OS::SNPrintF(Vector<char> str, const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  int result = VSNPrintF(str, format, args);
+  va_end(args);
+  return result;
+}
+
+
+int OS::VSNPrintF(Vector<char> str,
+                  const char* format,
+                  va_list args) {
+  int n = vsnprintf(str.start(), str.length(), format, args);
+  if (n < 0 || n >= str.length()) {
+    str[str.length() - 1] = '\0';
+    return -1;
+  } else {
+    return n;
+  }
+}
+
+
+// ----------------------------------------------------------------------------
+// POSIX string support.
+//
+
+char* OS::StrChr(char* str, int c) {
+  return strchr(str, c);
+}
+
+
+void OS::StrNCpy(Vector<char> dest, const char* src, size_t n) {
+  strncpy(dest.start(), src, n);
+}
+
+
+// ----------------------------------------------------------------------------
 // POSIX socket support.
 //