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/* buf.h
* Copyright (c) 2014, Peter Ohler
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of Peter Ohler nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef OX_BUF_H
#define OX_BUF_H
#include <ruby.h>
#include <stdbool.h>
#include <unistd.h>
typedef struct _buf {
char *head;
char *end;
char *tail;
int fd;
bool err;
char base[16384];
} *Buf;
inline static void buf_init(Buf buf, int fd, long initial_size) {
if (sizeof(buf->base) < (size_t)initial_size) {
buf->head = ALLOC_N(char, initial_size);
buf->end = buf->head + initial_size - 1;
} else {
buf->head = buf->base;
buf->end = buf->base + sizeof(buf->base) - 1;
}
buf->tail = buf->head;
buf->fd = fd;
buf->err = false;
}
inline static void buf_reset(Buf buf) {
buf->head = buf->base;
buf->tail = buf->head;
}
inline static void buf_cleanup(Buf buf) {
if (buf->base != buf->head) {
free(buf->head);
}
}
inline static size_t buf_len(Buf buf) {
return buf->tail - buf->head;
}
inline static void buf_append_string(Buf buf, const char *s, size_t slen) {
if (buf->err) {
return;
}
if (buf->end <= buf->tail + slen) {
if (0 != buf->fd) {
size_t len = buf->tail - buf->head;
if (len != (size_t)write(buf->fd, buf->head, len)) {
buf->err = true;
return;
}
buf->tail = buf->head;
if (sizeof(buf->base) <= slen) {
if (slen != (size_t)write(buf->fd, s, slen)) {
buf->err = true;
return;
}
return;
}
} else {
size_t len = buf->end - buf->head;
size_t toff = buf->tail - buf->head;
size_t new_len = len + slen + len / 2;
if (buf->base == buf->head) {
buf->head = ALLOC_N(char, new_len);
memcpy(buf->head, buf->base, len);
} else {
REALLOC_N(buf->head, char, new_len);
}
buf->tail = buf->head + toff;
buf->end = buf->head + new_len - 2;
}
}
if (0 < slen) {
memcpy(buf->tail, s, slen);
}
buf->tail += slen;
}
inline static void buf_append(Buf buf, char c) {
if (buf->err) {
return;
}
if (buf->end <= buf->tail) {
if (0 != buf->fd) {
size_t len = buf->tail - buf->head;
if (len != (size_t)write(buf->fd, buf->head, len)) {
buf->err = true;
}
buf->tail = buf->head;
} else {
size_t len = buf->end - buf->head;
size_t toff = buf->tail - buf->head;
size_t new_len = len + len / 2;
if (buf->base == buf->head) {
buf->head = ALLOC_N(char, new_len);
memcpy(buf->head, buf->base, len);
} else {
REALLOC_N(buf->head, char, new_len);
}
buf->tail = buf->head + toff;
buf->end = buf->head + new_len - 2;
}
}
*buf->tail++ = c;
//*buf->tail = '\0'; // for debugging
}
inline static void buf_finish(Buf buf) {
if (buf->err) {
return;
}
if (0 != buf->fd) {
size_t len = buf->tail - buf->head;
if (0 < len && len != (size_t)write(buf->fd, buf->head, len)) {
buf->err = true;
}
fsync(buf->fd);
buf->tail = buf->head;
}
}
#endif /* OX_BUF_H */
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