1 files changed, 73 insertions, 0 deletions
diff --git a/lib/libc/src/stdio/fwrite.c b/lib/libc/src/stdio/fwrite.c
new file mode 100644
index 0000000..ea79009
--- /dev/null
+++ b/lib/libc/src/stdio/fwrite.c
@@ -0,0 +1,73 @@
+/*
+ * 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 <string.h>
+#include <unistd.h>
+
+size_t
+fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
+{
+    const char *pos;
+    size_t n_remaining;
+
+    if (ptr == NULL || stream == NULL)
+        return 0;
+    if (size == 0 || nmemb == 0)
+        return 0;
+    if (!(stream->flags & FILE_WRITE))
+        return 0;
+
+    /* Write data to buffer, flushing as needed */
+    pos = ptr;
+    n_remaining = size * nmemb;
+    while (n_remaining > 0) {
+        size_t n_free = stream->write_end - stream->write_pos;
+
+        /* If enough buffer space is available, finish writing */
+        if (n_remaining < n_free) {
+            memcpy(stream->write_pos, pos, n_remaining);
+            stream->write_pos += n_remaining;
+            break;
+        }
+
+        /* Otherwise, write as much as possible now */
+        memcpy(stream->write_pos, pos, n_free);
+        stream->write_pos += n_free;
+
+        /* Return if flushing fails */
+        if (fflush(stream) == EOF)
+            return nmemb - (n_remaining / size);
+
+        pos += n_free;
+        n_remaining -= n_free;
+    }
+
+    return nmemb;
+}