mp3: Add support for id3 version 2 tags.

[paraslash.git] / stdout.c

diff --git a/stdout.c b/stdout.c
index 83703055c83c54edc9a7e17b050f3ca2d076c61e..87bf711f0d7a3794b7a6539c698a44457e984c28 100644 (file)
--- a/stdout.c
+++ b/stdout.c
@@ -1,3 +1,14 @@
+/*
+ * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+
+/** \file stdout.c Functions that deal with writing to stdout. */
+
+#include <dirent.h> /* readdir() */
+#include <assert.h>
+

 #include "para.h"
 #include "string.h"
 #include "list.h"
 #include "para.h"
 #include "string.h"
 #include "list.h"


@@ -6,35 +17,85 @@
 #include "error.h"
 #include "stdout.h"
 
 #include "error.h"
 #include "stdout.h"
 

-void stdout_pre_select(struct sched *s, struct task *t)
+/**
+ * The pre_select function of the stdout task.
+ *
+ * \param s The scheduler this task was registered to.
+ * \param t The task structure of the stdout task.
+ *
+ * This function is always successful. If there is data available in the input
+ * buffer, it adds \p STDOUT_FILENO to the write fd set of \a s.
+ */
+static void stdout_pre_select(struct sched *s, struct task *t)

 {
 {

-       struct stdout_task *sot = t->private_data;
+       struct stdout_task *sot = container_of(t, struct stdout_task, task);

 
 

-       t->ret = 1;
+       t->error = 0;

        sot->check_fd = 0;
        sot->check_fd = 0;

-       if (!*sot->loaded)
+       if (!*sot->loaded) {
+               if (*sot->input_error < 0) {
+                       t->error = *sot->input_error;
+                       s->timeout.tv_sec = 0;
+                       s->timeout.tv_usec = 1;
+               }

                return;
                return;

+       }

        sot->check_fd = 1;
        para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
 }
 
        sot->check_fd = 1;
        para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
 }
 

-void stdout_post_select(struct sched *s, struct task *t)
+/**
+ * The post select function of the stdout task.
+ *
+ * \param s The scheduler this task was registered to.
+ * \param t The task structure of the stdout task.
+ *
+ * This function checks if \p STDOUT_FILENO was included by in the write fd set
+ * of \a s during the previous pre_select call.  If yes, and \p STDOUT_FILENO
+ * appeears to be writable, the data loaded in the input buffer is written to
+ * stdout.
+ */
+static void stdout_post_select(struct sched *s, struct task *t)

 {
 {

-       struct stdout_task *sot = t->private_data;
+       struct stdout_task *sot = container_of(t, struct stdout_task, task);

        ssize_t ret;
 
        ssize_t ret;
 

-       t->ret = 1;
+       t->error = 0;

        if (!sot->check_fd) {
        if (!sot->check_fd) {

-               if (*sot->eof)
-                       t->ret = -E_STDOUT_EOF;
+               if (!*sot->loaded && *sot->input_error < 0)
+                       t->error = *sot->input_error;

                return;
        }
        if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
                return;
                return;
        }
        if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
                return;

-       t->ret = -E_STDOUT_WRITE;

        ret = write(STDOUT_FILENO, sot->buf, *sot->loaded);
        ret = write(STDOUT_FILENO, sot->buf, *sot->loaded);

-       if (ret <= 0)
+       if (ret < 0) {
+               t->error = -ERRNO_TO_PARA_ERROR(errno);

                return;
                return;

+       }

        *sot->loaded -= ret;
        *sot->loaded -= ret;

-       t->ret = 1;
+       if (*sot->loaded)
+               memmove(sot->buf, sot->buf + ret, *sot->loaded);
+}
+
+/**
+ * Initialize a stdout task structure with default values.
+ *
+ * \param sot The stdout task structure.
+ *
+ * This fills in the pre/post select function poinzters of the task structure
+ * given by \a sot.
+ */
+void stdout_set_defaults(struct stdout_task *sot)
+{
+       int ret;
+
+       sot->task.pre_select = stdout_pre_select;
+       sot->task.post_select = stdout_post_select;
+       sprintf(sot->task.status, "stdout writer");
+       ret = mark_fd_nonblocking(STDOUT_FILENO);
+       if (ret >= 0)
+               return;
+       PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+       exit(EXIT_FAILURE);

 }
 }