1 files changed, 46 insertions, 0 deletions
diff --git a/libc/src/stdio/gpu/fgets.cpp b/libc/src/stdio/gpu/fgets.cpp
new file mode 100644
index 000000000000..df00451e2a97
--- /dev/null
+++ b/libc/src/stdio/gpu/fgets.cpp
@@ -0,0 +1,46 @@
+//===-- GPU implementation of fgets ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/stdio/fgets.h"
+#include "file.h"
+#include "src/stdio/feof.h"
+#include "src/stdio/ferror.h"
+
+#include <stddef.h>
+#include <stdio.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(char *, fgets,
+                   (char *__restrict str, int count,
+                    ::FILE *__restrict stream)) {
+  if (count < 1)
+    return nullptr;
+
+  // This implementation is very slow as it makes multiple RPC calls.
+  unsigned char c = '\0';
+  int i = 0;
+  for (; i < count - 1 && c != '\n'; ++i) {
+    auto r = file::read(stream, &c, 1);
+    if (r != 1)
+      break;
+
+    str[i] = c;
+  }
+
+  bool has_error = __llvm_libc::ferror(stream);
+  bool has_eof = __llvm_libc::feof(stream);
+
+  if (has_error || (i == 0 && has_eof))
+    return nullptr;
+
+  str[i] = '\0';
+  return str;
+}
+
+} // namespace __llvm_libc