libc: Add close() and stdio functions

Signed-off-by: Kaimakan71 <undefined.foss@gmail.com>
Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 82 insertions, 0 deletions

diff --git a/lib/libc/src/stdio/fdopen.c b/lib/libc/src/stdio/fdopen.c
new file mode 100644
index 0000000..37352e9
--- /dev/null
+++ b/lib/libc/src/stdio/fdopen.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+
+#include <unistd.h>
+
+#define WRITE_BUF_SIZE 128
+
+/* TODO: Allocate these once malloc() is implemented */
+static FILE default_stream;
+static char default_write_buf[WRITE_BUF_SIZE];
+
+FILE*
+fdopen(int fd, const char *mode)
+{
+    FILE *stream;
+    int flags;
+
+    if (mode == NULL)
+        return NULL;
+
+    /* Determine stream flags */
+    flags = 0;
+    switch (mode[0]) {
+    case 'r':
+        flags |= FILE_READ;
+        if (mode[1] == '+') {
+            flags |= FILE_WRITE;
+        }
+        break;
+    case 'w':
+    case 'a':
+        flags |= FILE_WRITE;
+        if (mode[1] == '+') {
+            flags |= FILE_READ;
+        }
+        break;
+    default:
+        return NULL;
+    }
+
+    /* Create stream */
+    stream = &default_stream;
+    stream->fd = fd;
+    stream->flags = flags;
+
+    /* Create write buffer if needed */
+    if (flags & FILE_WRITE) {
+        stream->write_buf = default_write_buf;
+        stream->write_pos = stream->write_buf;
+        stream->write_end = stream->write_buf + WRITE_BUF_SIZE;
+    }
+
+    return stream;
+}