include/vlc_memstream.h

   1 /*****************************************************************************
   2  * vlc_memstream.h:
   3  *****************************************************************************
   4  * Copyright (C) 2016 Rémi Denis-Courmont
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifndef VLC_MEMSTREAM_H
  22 # define VLC_MEMSTREAM_H 1
  23
  24 # include <stdarg.h>
  25 # include <stdio.h>
  26
  27 struct vlc_memstream
  28 {
  29     union
  30     {
  31         FILE *stream;
  32         int error;
  33     };
  34     char *ptr;
  35     size_t length;
  36 };
  37
  38 VLC_API
  39 int vlc_memstream_open(struct vlc_memstream *ms);
  40
  41 VLC_API
  42 int vlc_memstream_flush(struct vlc_memstream *ms) VLC_USED;
  43
  44 VLC_API
  45 int vlc_memstream_close(struct vlc_memstream *ms) VLC_USED;
  46
  47 VLC_API
  48 size_t vlc_memstream_write(struct vlc_memstream *ms,
  49                            const void *ptr, size_t len);
  50
  51 VLC_API
  52 int vlc_memstream_putc(struct vlc_memstream *ms, int c);
  53
  54 VLC_API
  55 int vlc_memstream_puts(struct vlc_memstream *ms, const char *str);
  56
  57 VLC_API
  58 int vlc_memstream_vprintf(struct vlc_memstream *ms, const char *fmt,
  59                           va_list args);
  60
  61 VLC_API
  62 int vlc_memstream_printf(struct vlc_memstream *s, const char *fmt,
  63                          ...) VLC_FORMAT(2,3);
  64
  65 # ifdef __GNUC__
  66 static inline int vlc_memstream_puts_len(struct vlc_memstream *ms,
  67                                          const char *str, size_t len)
  68 {
  69     return (vlc_memstream_write(ms, str, len) == len) ? (int)len : EOF;
  70 }
  71 #  define vlc_memstream_puts(ms,s) \
  72     (__builtin_constant_p(__builtin_strlen(s)) ? \
  73         vlc_memstream_puts_len(ms,s,__builtin_strlen(s)) : \
  74         vlc_memstream_puts(ms,s))
  75 # endif
  76 #endif /* VLC_MEMSTREAM_H */