115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/*
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include/proto/buffers.h
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Buffer management definitions, macros and inline functions.
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Copyright (C) 2000-2006 Willy Tarreau - w@1wt.eu
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation, version 2.1
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exclusively.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _PROTO_BUFFERS_H
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#define _PROTO_BUFFERS_H
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#include <stdlib.h>
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#include <common/config.h>
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#include <types/buffers.h>
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/* Initializes all fields in the buffer. The ->rlim field is initialized last
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* so that the compiler can optimize it away if changed immediately after the
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* call to this function.
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*/
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static inline void buffer_init(struct buffer *buf)
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{
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buf->l = buf->total = buf->flags = 0;
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buf->rlim = buf->h = buf->r = buf->lr = buf->w = buf->data;
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}
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/* returns 1 if the buffer is empty, 0 otherwise */
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static inline int buffer_isempty(const struct buffer *buf)
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{
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return buf->l == 0;
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}
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/* returns 1 if the buffer is full, 0 otherwise */
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static inline int buffer_isfull(const struct buffer *buf) {
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return buf->l == BUFSIZE;
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}
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/* flushes any content from buffer <buf> */
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static inline void buffer_flush(struct buffer *buf)
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{
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buf->r = buf->h = buf->lr = buf->w = buf->data;
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buf->l = 0;
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}
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/* returns the maximum number of bytes writable at once in this buffer */
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static inline int buffer_max(const struct buffer *buf)
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{
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if (buf->l == BUFSIZE)
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return 0;
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else if (buf->r >= buf->w)
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return buf->data + BUFSIZE - buf->r;
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else
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return buf->w - buf->r;
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}
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/*
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* Tries to realign the given buffer, and returns how many bytes can be written
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* there at once without overwriting anything.
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*/
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static inline int buffer_realign(struct buffer *buf)
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{
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if (buf->l == 0) {
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/* let's realign the buffer to optimize I/O */
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buf->r = buf->w = buf->h = buf->lr = buf->data;
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}
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return buffer_max(buf);
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}
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int buffer_write(struct buffer *buf, const char *msg, int len);
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int buffer_write_chunk(struct buffer *buf, struct chunk *chunk);
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int buffer_replace(struct buffer *b, char *pos, char *end, char *str);
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int buffer_replace2(struct buffer *b, char *pos, char *end, char *str, int len);
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int chunk_printf(struct chunk *chk, int size, const char *fmt, ...);
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/*
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* frees the destination chunk if already allocated, allocates a new string,
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* and copies the source into it. The pointer to the destination string is
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* returned, or NULL if the allocation fails or if any pointer is NULL..
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*/
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static inline char *chunk_dup(struct chunk *dst, const struct chunk *src) {
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if (!dst || !src || !src->str)
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return NULL;
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if (dst->str)
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free(dst->str);
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dst->len = src->len;
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dst->str = (char *)malloc(dst->len);
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memcpy(dst->str, src->str, dst->len);
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return dst->str;
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}
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#endif /* _PROTO_BUFFERS_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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