Move everything into a new repo.

1 files changed, 54 insertions, 0 deletions

diff --git a/userland/libc/stdio/stdin.c b/userland/libc/stdio/stdin.c
new file mode 100644
index 0000000..ae3ab8d
--- /dev/null
+++ b/userland/libc/stdio/stdin.c
@@ -0,0 +1,54 @@
+#include <assert.h>
+#include <stdio.h>
+#include <unistd.h>
+
+size_t write_fd(FILE *f, const unsigned char *s, size_t l) {
+  int rc = pwrite(f->fd, s, l, f->offset_in_file);
+  if (rc == -1) {
+    f->has_error = 1;
+    return 0;
+  }
+  f->offset_in_file += rc;
+  return rc;
+}
+
+size_t read_fd(FILE *f, unsigned char *s, size_t l) {
+  int rc = pread(f->fd, s, l, f->offset_in_file);
+  if (rc == 0)
+    f->is_eof = 1;
+  if (rc == -1) {
+    f->has_error = 1;
+    return 0;
+  }
+  f->offset_in_file += rc;
+  return rc;
+}
+
+int seek_fd(FILE *stream, long offset, int whence) {
+  switch (whence) {
+  case SEEK_SET:
+    stream->offset_in_file = offset;
+    break;
+  case SEEK_CUR:
+    stream->offset_in_file += offset;
+    break;
+  case SEEK_END:
+    stream->offset_in_file = stream->file_size + offset;
+    break;
+  default:
+    assert(0);
+    break;
+  }
+  // FIXME: Error checking
+  return 0;
+}
+
+FILE __stdin_FILE = {
+    .write = write_fd,
+    .read = read_fd,
+    .seek = NULL,
+    .is_eof = 0,
+    .has_error = 0,
+    .cookie = NULL,
+    .fd = 0,
+};