From 71176a6fc5b54529b3abde1d714f7047a759bc1a Mon Sep 17 00:00:00 2001
From: Philipp Schafft <lion@lion.leolix.org>
Date: Thu, 27 Jun 2019 11:02:18 +0000
Subject: [PATCH] Feature: Added some basic implementation

---
 src/io.c | 218 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 218 insertions(+)

diff --git a/src/io.c b/src/io.c
index 88166fe..2a92261 100644
--- a/src/io.c
+++ b/src/io.c
@@ -11,6 +11,7 @@
 #endif
 
 #include <stdlib.h>
+#include <string.h>
 
 #include <igloo/ro.h>
 #include <igloo/io.h>
@@ -18,8 +19,225 @@
 
 struct igloo_io_tag {
     igloo_interface_base(io)
+    int touched;
+#if defined(IGLOO_CTC_HAVE_SYS_SELECT_H) || defined(IGLOO_CTC_HAVE_POLL)
+    int fd;
+#endif
 };
 
 igloo_RO_PUBLIC_TYPE(igloo_io_t,
         igloo_RO_TYPEDECL_FREE(igloo_interface_base_free)
         );
+
+ssize_t igloo_io_read(igloo_io_t *io, void *buffer, size_t len)
+{
+    if (!io || !buffer)
+        return -1;
+
+    if (!len)
+        return 0;
+
+    io->touched = 1;
+
+    if (io->ifdesc->read)
+        return io->ifdesc->read(igloo_INTERFACE_BASIC_CALL(io), buffer, len);
+
+    return -1;
+}
+
+ssize_t igloo_io_write(igloo_io_t *io, const void *buffer, size_t len)
+{
+    if (!io || !buffer)
+        return -1;
+
+    if (!len)
+        return 0;
+
+    io->touched = 1;
+
+    if (io->ifdesc->write)
+        return io->ifdesc->write(igloo_INTERFACE_BASIC_CALL(io), buffer, len);
+
+    return -1;
+}
+
+int igloo_io_flush(igloo_io_t *io, igloo_io_opflag_t flags)
+{
+    if (!io)
+        return -1;
+
+    io->touched = 1;
+
+    if (io->ifdesc->flush)
+        return io->ifdesc->flush(igloo_INTERFACE_BASIC_CALL(io), flags);
+
+    return -1;
+}
+
+int igloo_io_sync(igloo_io_t *io, igloo_io_opflag_t flags)
+{
+    int ret;
+
+    if (!io)
+        return -1;
+
+    if (io->ifdesc->flush)
+        io->ifdesc->flush(igloo_INTERFACE_BASIC_CALL(io), flags);
+
+    if (io->ifdesc->sync) {
+        ret = io->ifdesc->sync(igloo_INTERFACE_BASIC_CALL(io), flags);
+        if (ret != 0)
+            return ret;
+
+        io->touched = 0;
+
+        return ret;
+    }
+
+    return -1;
+}
+
+int igloo_io_set_blockingmode(igloo_io_t *io, libigloo_io_blockingmode_t mode)
+{
+    if (!io)
+        return -1;
+
+    if (mode != igloo_IO_BLOCKINGMODE_NONE && mode != igloo_IO_BLOCKINGMODE_FULL)
+        return -1;
+
+    io->touched = 1;
+
+    if (io->ifdesc->set_blockingmode)
+        return io->ifdesc->set_blockingmode(igloo_INTERFACE_BASIC_CALL(io), mode);
+
+    return -1;
+}
+libigloo_io_blockingmode_t igloo_io_get_blockingmode(igloo_io_t *io)
+{
+    if (!io)
+        return igloo_IO_BLOCKINGMODE_ERROR;
+
+    if (io->ifdesc->get_blockingmode)
+        return io->ifdesc->get_blockingmode(igloo_INTERFACE_BASIC_CALL(io));
+
+    return igloo_IO_BLOCKINGMODE_ERROR;
+}
+
+#ifdef IGLOO_CTC_HAVE_SYS_SELECT_H
+int igloo_io_select_set(igloo_io_t *io, fd_set *set, int *maxfd, igloo_io_opflag_t flags)
+{
+    int ret;
+
+    if (!io || !set || !maxfd)
+        return -1;
+
+    if (!io->ifdesc->get_fd_for_systemcall)
+        return -1;
+
+    if (io->touched || !(flags & igloo_IO_OPFLAG_NOWRITE)) {
+        ret = igloo_io_sync(io, igloo_IO_OPFLAG_DEFAULTS|(flags & igloo_IO_OPFLAG_NOWRITE));
+        if (ret != 0)
+            return ret;
+        if (io->touched)
+            return -1;
+    }
+
+    io->fd = io->ifdesc->get_fd_for_systemcall(igloo_INTERFACE_BASIC_CALL(io));
+    if (io->fd < 0)
+        return -1;
+
+    FD_SET(io->fd, set);
+    if (*maxfd < io->fd)
+        *maxfd = io->fd;
+
+    return 0;
+}
+
+int igloo_io_select_clear(igloo_io_t *io, fd_set *set)
+{
+    if (!io || !set)
+        return -1;
+
+    if (io->touched || io->fd < 0)
+        return -1;
+
+    FD_CLR(io->fd, set);
+
+    return 0;
+}
+
+int igloo_io_select_isset(igloo_io_t *io, fd_set *set)
+{
+    if (!io || !set)
+        return -1;
+
+    if (io->touched || io->fd < 0)
+        return -1;
+
+    return FD_ISSET(io->fd, set) ? 1 : 0;
+}
+#endif
+
+#ifdef IGLOO_CTC_HAVE_POLL
+int igloo_io_poll_fill(igloo_io_t *io, struct pollfd *fd, short events)
+{
+    static const short safe_events = POLLIN|POLLPRI
+#ifdef POLLRDHUP
+        |POLLRDHUP
+#endif
+#ifdef POLLRDNORM
+        |POLLRDNORM
+#endif
+    ;
+    int is_safe;
+    int ret;
+
+    if (!io || !fd)
+        return -1;
+
+    if (!io->ifdesc->get_fd_for_systemcall)
+        return -1;
+
+    is_safe = !((events|safe_events) - safe_events);
+
+    if (io->touched || !is_safe) {
+        ret = igloo_io_sync(io, igloo_IO_OPFLAG_DEFAULTS|(is_safe ? 0 : igloo_IO_OPFLAG_NOWRITE));
+        if (ret != 0)
+            return ret;
+        if (io->touched)
+            return -1;
+    }
+
+    io->fd = io->ifdesc->get_fd_for_systemcall(igloo_INTERFACE_BASIC_CALL(io));
+    if (io->fd < 0)
+        return -1;
+
+    memset(fd, 0, sizeof(*fd));
+    fd->fd = io->fd;
+    fd->events = events;
+
+    return 0;
+}
+#endif
+
+int igloo_io_control(igloo_io_t *io, igloo_io_opflag_t flags, igloo_io_control_t control, ...)
+{
+#ifdef IGLOO_CTC_STDC_HEADERS
+    int ret;
+    va_list ap;
+
+    if (!io)
+        return -1;
+
+    if (!io->ifdesc->control)
+        return -1;
+
+    va_start(ap, control);
+    ret = io->ifdesc->control(igloo_INTERFACE_BASIC_CALL(io), flags, control, ap);
+    va_end(ap);
+
+    return ret;
+#else
+    return -1;
+#endif
+}