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/*
version 20220222
*/
#include <unistd.h>
#include <errno.h>
#include "buffer.h"
void buffer_init(buffer *s, long long (*op)(int, void *, long long), int fd,
void *x, long long xlen) {
s->x = x;
s->fd = fd;
s->op = op;
s->p = 0;
s->n = xlen;
if (s->n < 0) s->n = 0;
}
long long buffer_write(int fd, void *x, long long xlen) {
if (xlen < 0) {
errno = EINVAL;
return -1;
}
return write(fd, x, xlen);
}
static int allwrite(long long (*op)(int, void *, long long), int fd,
const void *xv, long long xlen) {
char *x = (char *) xv;
long long w;
while (xlen > 0) {
w = xlen;
if (w > BUFFER_OUTSIZE) w = BUFFER_OUTSIZE;
w = op(fd, x, w);
if (w == -1) {
if (errno == EINTR) continue;
return -1;
}
x += w;
xlen -= w;
}
return 0;
}
int buffer_flush(buffer *s) {
if (allwrite(s->op, s->fd, s->x, s->p) < 0) return -1;
s->p = 0;
return 0;
}
int buffer_put(buffer *s, const void *xv, long long xlen) {
char *x = (char *) xv;
long long i, n;
if (xlen < 0) {
errno = EINVAL;
return -1;
}
if (xlen > (n = s->n - s->p)) {
for (i = 0; i < n; ++i) s->x[s->p + i] = x[i];
s->p += n;
x += n;
xlen -= n;
if (buffer_flush(s) == -1) return -1;
}
if (xlen >= s->n) return allwrite(s->op, s->fd, x, xlen);
for (i = 0; i < xlen; ++i) s->x[s->p + i] = x[i];
s->p += xlen;
return 0;
}
int buffer_puts(buffer *s, const char *x) {
long long xlen;
for (xlen = 0; x[xlen]; ++xlen)
;
return buffer_put(s, x, xlen);
}
int buffer_putflush(buffer *s, const void *xv, long long xlen) {
if (xlen < 0) {
errno = EINVAL;
return -1;
}
if (buffer_flush(s) == -1) return -1;
return allwrite(s->op, s->fd, xv, xlen);
}
int buffer_putsflush(buffer *s, const char *x) {
long long xlen;
for (xlen = 0; x[xlen]; ++xlen)
;
return buffer_putflush(s, x, xlen);
}
long long buffer_read(int fd, void *x, long long xlen) {
if (xlen < 0) {
errno = EINVAL;
return -1;
}
return read(fd, x, xlen);
}
static long long oneread(long long (*op)(int, void *, long long), int fd,
void *x, long long xlen) {
long long r;
for (;;) {
if (xlen > BUFFER_INSIZE) xlen = BUFFER_INSIZE;
r = op(fd, x, xlen);
if (r == -1 && errno == EINTR) continue;
return r;
}
}
long long buffer_feed(buffer *s) {
long long i, 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)
for (i = r - 1; i >= 0; --i) s->x[s->n + i] = s->x[i];
return r;
}
static long long getthis(buffer *s, char *x, long long xlen) {
long long i;
if (xlen > s->p) xlen = s->p;
s->p -= xlen;
for (i = 0; i < xlen; ++i) x[i] = s->x[s->n + i];
s->n += xlen;
return xlen;
}
long long buffer_get(buffer *s, void *xv, long long xlen) {
long long r;
if (xlen < 0) {
errno = EINVAL;
return -1;
}
if (s->p > 0) return getthis(s, xv, xlen);
if (s->n <= xlen) return oneread(s->op, s->fd, xv, xlen);
r = buffer_feed(s);
if (r <= 0) return r;
return getthis(s, xv, xlen);
}
int buffer_copy(buffer *bout, buffer *bin) {
long long 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);
}
}
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