io.c io.h io0.h

istream_t and ostream_t implementation.

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Library Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include <io0.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+int
+istream_init (istream_t *pis)
+{
+  istream_t is;
+  if (pis == NULL)
+    return EINVAL;
+  is = calloc (1, sizeof (*is));
+  if (is == NULL)
+    return ENOMEM;
+  *pis = is;
+  return 0;
+}
+
+int
+ostream_init (ostream_t *pos)
+{
+  ostream_t os;
+  if (pos == NULL)
+    return EINVAL;
+  os = calloc (1, sizeof (*os));
+  if (os == NULL)
+    return ENOMEM;
+  *pos = os;
+  return 0;
+}
+
+void
+istream_destroy (istream_t *pis)
+{
+  free (pis);
+}
+
+void
+ostream_destroy (ostream_t *pos)
+{
+  free (pos);
+}
+
+int
+istream_set_read (istream_t is, ssize_t (*read)
+		  __P ((istream_t, char *, size_t, off_t)))
+{
+  if (is == NULL)
+    return EINVAL;
+  is->_read = read;
+  return 0;
+}
+
+int
+ostream_set_write (ostream_t os, ssize_t (*write)
+		   __P ((ostream_t, const char *, size_t, off_t)))
+{
+  if (os == NULL)
+    return EINVAL;
+  os->_write = write;
+  return 0;
+}
+
+ssize_t
+istream_read (istream_t is, char *buf, size_t count, off_t offset)
+{
+  if (is == NULL || is->_read == NULL)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+  return is->_read (is, buf, count, offset);
+}
+
+ssize_t
+ostream_write (ostream_t os, const char *buf, size_t count, off_t offset)
+{
+  if (os == NULL || os->_write == NULL)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+  return os->_write (os, buf, count, offset);
+}

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Library Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef _IO_H
+# define _IO_H
+
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef __P
+# ifdef __STDC__
+#  define __P(args) args
+# else
+#  define __P(args) ()
+# endif
+#endif /*__P */
+
+struct _istream;
+typedef struct _istream * istream_t;
+struct _ostream;
+typedef struct _ostream * ostream_t;
+
+extern ssize_t istream_read __P ((istream_t, char *, size_t, off_t));
+
+extern ssize_t ostream_write __P ((ostream_t, const char *, size_t, off_t));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _IO_H */

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Library Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef _IO0_H
+# define _IO0_H
+
+#include <io.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef __P
+# ifdef __STDC__
+#  define __P(args) args
+# else
+#  define __P(args) ()
+# endif
+#endif /*__P */
+
+struct _istream
+{
+  /* owner of the stream can not be a specific type */
+  void *owner;
+  ssize_t (*_read) __P ((istream_t, char *, size_t, off_t));
+};
+
+struct _ostream
+{
+  /* owner of the stream can not be a specific type */
+  void *owner;
+  ssize_t (*_write) __P ((ostream_t, const char *, size_t, off_t));
+};
+
+extern int istream_init __P ((istream_t *));
+extern void istream_destroy __P ((istream_t *));
+extern int ostream_init __P ((ostream_t *));
+extern void ostream_destroy __P ((ostream_t *));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _IO0_H */