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#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include "buffer.h"
#include "error.h"
static int do_read(int sock, void *buf, int len) {
int err;
err = read(sock, buf, len);
if(err == -1) {
switch(errno) {
case EAGAIN:
return 0;
break;
default:
rl_warn("read(%d, %p, %d): %d (%s)", sock, buf, len,
errno, strerror(errno));
return -1;
}
}
return err;
}
int rlbuf_read(int sock, struct rl_buffer *buf) {
int done, err, size;
if(!buf) {
rl_warn("rlbuf_read called with NULL buf");
return 0;
}
done = 0;
err = 0;
if(buf->head >= buf->tail) {
size = buf->size - buf->head - !buf->tail;
if(size) {
if((err = do_read(sock, buf->data + buf->head, size)) < 0)
return err;
buf->head += err;
done += err;
if(err < size)
return err;
if(buf->tail)
buf->head = 0;
}
}
if(buf->tail && (buf->head < buf->tail)) {
size = buf->tail - 1;
if(size) {
err = do_read(sock, buf->data, size);
if(err < 0)
err = 0;
buf->head += err;
done += err;
}
}
return done;
}
static int do_write(int sock, void *buf, int len) {
int err;
err = write(sock, buf, len);
if(err == -1) {
switch(errno) {
case EAGAIN:
return 0;
break;
default:
rl_warn("write(%d, %p, %d): %d (%s)", sock, buf, len,
errno, strerror(errno));
case EPIPE:
return -1;
}
}
return err;
}
int rlbuf_write(int sock, struct rl_buffer *buf) {
int done, err, size;
if(!buf) {
rl_warn("rlbuf_write called with NULL buf");
return 0;
}
done = 0;
err = 0;
if(buf->head == buf->tail)
return 0;
if(buf->head > buf->tail)
size = buf->head - buf->tail;
else
size = buf->size - buf->tail;
if(size) {
if((err = do_write(sock, buf->data + buf->tail, size)) < 0)
return err;
buf->tail += err;
done += err;
if(err < size)
return err;
if(buf->tail == buf->size)
buf->tail = 0;
}
if(buf->tail < buf->head) {
size = buf->head - buf->tail;
err = do_write(sock, buf->data + buf->tail, size);
if(err < 0)
err = 0;
buf->tail += err;
done += err;
}
return done;
}
int rlbuf_copy(int sock, struct rl_buffer *buf, int offset) {
int done, err, size;
if(!buf) {
rl_warn("rlbuf_write called with NULL buf");
return 0;
}
done = 0;
err = 0;
if(buf->head == buf->tail)
return 0;
if(buf->head > buf->tail)
size = buf->head - buf->tail;
else
size = buf->size - buf->tail;
if(size <= offset) {
offset -= size;
size = 0;
}
if(size) {
if((err = do_write(sock, buf->data + buf->tail + offset, size)) < 0)
return err;
done += err;
if(err < size)
return err;
}
offset -= done;
if(offset < 0)
offset = 0;
if(buf->tail > buf->head) {
size = buf->head - offset;
if(size <= 0)
return 0;
err = do_write(sock, buf->data + offset, size);
if(err < 0)
err = 0;
done += err;
}
return done;
}
void rlbuf_init(struct rl_buffer **buf, int size) {
if(!*buf) {
*buf = malloc(sizeof(**buf));
if (!(*buf))
rl_fatal(EX_SOFTWARE, "ABORT - Can't allocate memory");
memset(*buf, 0, sizeof(**buf));
} else {
(*buf)->head = (*buf)->tail = 0;
}
if((*buf)->data) {
free((*buf)->data);
(*buf)->data = NULL;
}
if(size) {
(*buf)->size = size;
(*buf)->data = malloc(size);
if (!(*buf)->data)
rl_fatal(EX_SOFTWARE, "ABORT - Can't allocate memory");
}
}
/* vim: set ts=2: */
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