Translate common host error codes

Caller may reasonably be expected to query some codes, such as 'not found'

Author: mikee47

src/HostUtil.cpp

@@ -69,6 +69,32 @@ int mapFlags(OpenFlags flags)
 	return ret;
 }
 
+int syserr()
+{
+	switch(errno) {
+	case EPERM:
+	case EACCES:
+		return Error::Denied;
+	case ENOMEM:
+		return Error::NoMem;
+	case ENOENT:
+		return Error::NotFound;
+	case ENFILE:
+	case EMFILE:
+		return Error::OutOfFileDescs;
+	case EFBIG:
+		return Error::TooBig;
+	case ENOSPC:
+		return Error::NoSpace;
+	case EROFS:
+		return Error::ReadOnly;
+	case EINVAL:
+		return Error::BadParam;
+	default:
+		return Error::fromSystem(-errno);
+	}
+}
+
 String getErrorString(int err)
 {
 	if(Error::isSystem(err)) {

src/include/IFS/Host/Util.h

@@ -34,10 +34,7 @@ namespace IFS::Host
 /**
  * @brief Get IFS error code for the current system errno
  */
-inline int syserr()
-{
-	return Error::fromSystem(-errno);
-}
+int syserr();
 
 /**
  * @brief Get corresponding host flags for given IFS flags