mirror of
https://github.com/moparisthebest/wget
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71 lines
2.6 KiB
C
71 lines
2.6 KiB
C
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/* Declarations for rbuf.c.
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Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of Wget.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifndef RBUF_H
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#define RBUF_H
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/* Retrieval stream */
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struct rbuf
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{
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int fd;
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char buffer[4096]; /* the input buffer */
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char *buffer_pos; /* current position in the buffer */
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size_t buffer_left; /* number of bytes left in the buffer:
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buffer_left = buffer_end - buffer_pos */
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int internal_dont_touch_this; /* used by RBUF_READCHAR macro */
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};
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/* Read a character from RBUF. If there is anything in the buffer,
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the character is returned from the buffer. Otherwise, refill the
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buffer and return the first character.
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The return value is the same as with read(2). On buffered read,
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the function returns 1.
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#### That return value is totally screwed up, and is a direct
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result of historical implementation of header code. The macro
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should return the character or EOF, and in case of error store it
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to rbuf->err or something. */
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#define RBUF_READCHAR(rbuf, store) \
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((rbuf)->buffer_left \
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? (--(rbuf)->buffer_left, \
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*((char *) (store)) = *(rbuf)->buffer_pos++, 1) \
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: ((rbuf)->buffer_pos = (rbuf)->buffer, \
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((((rbuf)->internal_dont_touch_this \
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= iread ((rbuf)->fd, (rbuf)->buffer, \
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sizeof ((rbuf)->buffer))) <= 0) \
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? (rbuf)->internal_dont_touch_this \
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: ((rbuf)->buffer_left = (rbuf)->internal_dont_touch_this - 1, \
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*((char *) (store)) = *(rbuf)->buffer_pos++, \
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1))))
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/* Return the file descriptor of RBUF. */
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#define RBUF_FD(rbuf) ((rbuf)->fd)
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/* Function declarations */
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void rbuf_initialize PARAMS ((struct rbuf *, int));
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int rbuf_initialized_p PARAMS ((struct rbuf *));
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void rbuf_uninitialize PARAMS ((struct rbuf *));
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int rbuf_readchar PARAMS ((struct rbuf *, char *));
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int rbuf_peek PARAMS ((struct rbuf *, char *));
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int rbuf_flush PARAMS ((struct rbuf *, char *, int));
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void rbuf_discard PARAMS ((struct rbuf *));
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#endif /* RBUF_H */
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