From fbfc078e9f44c1c1e95c9c484f1d5650bcf631b7 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Sat, 27 Jul 2024 16:57:39 -0400
Subject: lots and lots of userspace stuff

---
 euler/source/std/cstdio.cpp | 59 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 euler/source/std/cstdio.cpp

(limited to 'euler/source/std/cstdio.cpp')

diff --git a/euler/source/std/cstdio.cpp b/euler/source/std/cstdio.cpp
new file mode 100644
index 0000000..8c12a7c
--- /dev/null
+++ b/euler/source/std/cstdio.cpp
@@ -0,0 +1,59 @@
+#include <cstdio>
+
+extern "C" FILE *fopen(const char *filename, const char *mode) {
+
+  bool r = false, w = false, a = false, p = false, x = false;
+  for (size_t i = 0; mode[i] != '\0'; ++i)
+         if (mode[i] == 'r') r = true;
+    else if (mode[i] == 'w') w = true;
+    else if (mode[i] == 'a') a = true;
+    else if (mode[i] == 'p') p = true;
+    else if (mode[i] == 'x') x = true;
+
+  euler::syscall::stream_handle handle;
+  if (euler::syscall::open_file(filename, !r, x, handle) !=
+      euler::syscall::stream_result::success)
+    return 0;
+
+  if (w && euler::syscall::set_stream_length(handle, 0) !=
+           euler::syscall::stream_result::success)
+      return 0;
+
+  if (a && euler::syscall::seek_stream(
+             handle, euler::syscall::seek_from::end, 0) !=
+           euler::syscall::stream_result::success) {
+    euler::syscall::close_stream(handle);
+    return 0;
+  }
+
+  uint64_t length;
+  if (euler::syscall::get_stream_length(handle, length) !=
+      euler::syscall::stream_result::success) {
+    euler::syscall::close_stream(handle);
+    return 0;
+  }
+
+  return new euler::file_stream(handle, r || p, length, a ? length : 0);
+
+}
+
+extern "C" void fclose(FILE *stream) {
+  stream->close();
+  delete stream;
+}
+
+extern "C" int fseek(FILE *stream, long offset, int origin) {
+
+  if (origin < 0 || origin > 2)
+    return -1;
+
+  return (int)stream->seek((euler::syscall::seek_from)origin, offset);
+
+}
+
+extern "C" size_t fread(
+  void *buffer, size_t size, size_t count, FILE *stream) {
+
+  return (stream->read(size * count, buffer).first - 1) / size + 1;
+
+}
-- 
cgit v1.2.3