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#include <unistd.h>
#include "buffer.h"
#include "str.h"
#include "byte.h"
#include "error.h"
/**
* @file buffer.c
* @author djb
* @brief input/output routines
*/
void buffer_init(buffer *s,ssize_t (*op)(),int fd,char *buf,size_t len)
{
s->x = buf;
s->fd = fd;
s->op = op;
s->p = 0;
s->n = len;
}
static ssize_t buffer_0_read(int fd,char *buf,size_t len)
{
if (buffer_flush(buffer_1) == -1) return -1;
return read(fd,buf,len);
}
ssize_t buffer_unixread(int fd,char *buf,size_t len)
{
return (ssize_t) read(fd,buf,len);
}
ssize_t buffer_unixwrite(int fd,char *buf,size_t len)
{
return (ssize_t) write(fd,buf,len);
}
char buffer_0_space[BUFFER_INSIZE];
static buffer it0 = BUFFER_INIT(buffer_0_read,0,buffer_0_space,sizeof(buffer_0_space));
buffer *buffer_0 = &it0;
char buffer_1_space[BUFFER_OUTSIZE];
static buffer it1 = BUFFER_INIT(buffer_unixwrite,1,buffer_1_space,sizeof(buffer_1_space));
buffer *buffer_1 = &it1;
char buffer_2_space[BUFFER_OUTSIZE];
static buffer it2 = BUFFER_INIT(buffer_unixwrite,2,buffer_2_space,sizeof(buffer_2_space));
buffer *buffer_2 = &it2;
char buffer_0_small[BUFFER_SMALL];
static buffer is0 = BUFFER_INIT(buffer_0_read,0,buffer_0_small,sizeof(buffer_0_small));
buffer *buffer_0small = &is0;
char buffer_1_small[BUFFER_SMALL];
static buffer is1 = BUFFER_INIT(buffer_unixwrite,1,buffer_1_small,sizeof(buffer_1_small));
buffer *buffer_1small = &is1;
char buffer_2_small[BUFFER_SMALL];
static buffer is2 = BUFFER_INIT(buffer_unixwrite,2,buffer_2_small,sizeof(buffer_2_small));
buffer *buffer_2small = &is2;
int buffer_copy(buffer *bout,buffer *bin)
{
int n;
char *x;
for (;;) {
n = buffer_feed(bin);
if (n < 0) return -2;
if (!n) return 0;
x = buffer_PEEK(bin);
if (buffer_put(bout,x,n) == -1) return -3;
buffer_SEEK(bin,n);
}
}
static int oneread(ssize_t (*op)(),int fd,char *buf,size_t len)
{
int r;
for (;;) {
r = op(fd,buf,len);
if (r == -1) if (errno == EINTR) continue;
return r;
}
}
static int getthis(buffer *s,char *buf,size_t len)
{
if (len > s->p) len = s->p;
s->p -= len;
byte_copy(buf,len,s->x + s->n);
s->n += len;
return len;
}
int buffer_feed(buffer *s)
{
int r;
if (s->p) return s->p;
r = oneread(s->op,s->fd,s->x,s->n);
if (r <= 0) return r;
s->p = r;
s->n -= r;
if (s->n > 0) byte_copyr(s->x + s->n,r,s->x);
return r;
}
int buffer_bget(buffer *s,char *buf,size_t len)
{
int r;
if (s->p > 0) return getthis(s,buf,len);
if (s->n <= len) return oneread(s->op,s->fd,buf,s->n);
r = buffer_feed(s);
if (r <= 0) return r;
return getthis(s,buf,len);
}
int buffer_get(buffer *s,char *buf,size_t len)
{
int r;
if (s->p > 0) return getthis(s,buf,len);
if (s->n <= len) return oneread(s->op,s->fd,buf,len);
r = buffer_feed(s);
if (r <= 0) return r;
return getthis(s,buf,len);
}
char *buffer_peek(buffer *s)
{
return s->x + s->n;
}
void buffer_seek(buffer *s,size_t len)
{
s->n += len;
s->p -= len;
}
static int allwrite(ssize_t (*op)(),int fd,const char *buf,size_t len)
{
int w;
while (len) {
w = op(fd,buf,len);
if (w == -1) {
if (errno == EINTR) continue;
return -1; /* note that some data may have been written */
}
if (w == 0) /* luser's fault */
;
buf += w;
len -= w;
}
return 0;
}
int buffer_flush(buffer *s)
{
int p;
p = s->p;
if (!p) return 0;
s->p = 0;
return allwrite(s->op,s->fd,s->x,p);
}
int buffer_putalign(buffer *s,const char *buf,size_t len)
{
unsigned int n;
while (len > (n = s->n - s->p)) {
byte_copy(s->x + s->p,n,buf); s->p += n; buf += n; len -= n;
if (buffer_flush(s) == -1) return -1;
}
/* now len <= s->n - s->p */
byte_copy(s->x + s->p,len,buf);
s->p += len;
return 0;
}
int buffer_put(buffer *s,const char *buf,size_t len)
{
unsigned int n;
n = s->n;
if (len > n - s->p) {
if (buffer_flush(s) == -1) return -1;
/* now s->p == 0 */
if (n < BUFFER_OUTSIZE) n = BUFFER_OUTSIZE;
while (len > s->n) {
if (n > len) n = len;
if (allwrite(s->op,s->fd,buf,n) == -1) return -1;
buf += n;
len -= n;
}
}
/* now len <= s->n - s->p */
byte_copy(s->x + s->p,len,buf);
s->p += len;
return 0;
}
int buffer_putflush(buffer *s,const char *buf,size_t len)
{
if (buffer_flush(s) == -1) return -1;
return allwrite(s->op,s->fd,buf,len);
}
int buffer_putsalign(buffer *s,const char *buf)
{
return buffer_putalign(s,buf,str_len(buf));
}
int buffer_puts(buffer *s,const char *buf)
{
return buffer_put(s,buf,str_len(buf));
}
int buffer_putsflush(buffer *s,const char *buf)
{
return buffer_putflush(s,buf,str_len(buf));
}
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