1 files changed, 47 insertions, 0 deletions
diff --git a/lib/libc/stdio/fread_unlocked.c b/lib/libc/stdio/fread_unlocked.c
new file mode 100644
index 00000000..4251a7ed
--- /dev/null
+++ b/lib/libc/stdio/fread_unlocked.c
@@ -0,0 +1,47 @@
+#include "__stdio.h" // for __FILE, _IO_EOF, _IO_ERR
+
+#include <atomic.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+extern void __libc_init_io(void);
+void *__libc_force_io_init = (void *)__libc_init_io;
+
+size_t fread_unlocked(void *restrict ptr, size_t size, size_t nitems, FILE *restrict stream)
+{
+	if (size == 0 || nitems == 0)
+		return 0;
+
+	size_t total = size * nitems;
+	size_t bytes_read = 0;
+	char *p = ptr;
+
+	while (total > 0) {
+		if (stream->buf_pos < stream->buf_len) {
+			size_t available = stream->buf_len - stream->buf_pos;
+			size_t to_copy = total < available ? total : available;
+
+			memcpy(p, stream->buf + stream->buf_pos, to_copy);
+			stream->buf_pos += to_copy;
+			p += to_copy;
+			bytes_read += to_copy;
+			total -= to_copy;
+			continue;
+		}
+
+		ssize_t ret = read(stream->fd, stream->buf, stream->buf_size);
+		if (ret <= 0) {
+			if (ret < 0)
+				stream->flags |= _IO_ERR;
+			else
+				stream->flags |= _IO_EOF;
+			break;
+		}
+
+		stream->buf_len = ret;
+		stream->buf_pos = 0;
+	}
+
+	return bytes_read / size;
+}