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#include "e.h"
#include "str.h"
#include "byte.h"
#include "buffer.h"
static int allwrite(long long (*op)(int, const char *, long long), int fd, const char *buf, long long len) {
long long w;
if (!buf || len < 0) { errno = EINVAL; return -1; }
while (len > 0) {
w = op(fd, buf, len);
if (w == -1) {
if (errno == EINTR) continue;
if (errno == EAGAIN) continue;
if (errno == EWOULDBLOCK) continue;
return -1;
}
buf += w;
len -= w;
}
return 0;
}
int buffer_flush(buffer *s) {
long long 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, long long len) {
long long n;
if (!buf || len < 0) { errno = EINVAL; return -1; }
while (len > (n = s->n - s->p)) {
byte_copy(s->x + s->p, n, buf); s->p += n; buf += n; len -= n;
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, long long len) {
long long n;
if (!buf || len < 0) { errno = EINVAL; return -1; }
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, long long 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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