1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
#include <string.h>
#include <unistd.h>
#ifndef __MINGW32__
#include <sys/uio.h>
#endif
#include "buffer.h"
extern int buffer_stubborn(ssize_t (*op)(),int fd,const char* buf, size_t len,void* cookie);
#ifndef __unlikely
#ifdef __GNUC__
#define __unlikely(x) __builtin_expect((x),0)
#else
#define __unlikely(x) (x)
#endif
#endif
int buffer_put(buffer* b,const char* buf,size_t len) {
if (__unlikely(len>b->a-b->p)) { /* doesn't fit */
#ifndef __MINGW32__
if (b->op==write) {
/* if it's write, we can substitute writev */
struct iovec v[2];
ssize_t r;
v[0].iov_base=b->x; v[0].iov_len=b->p;
v[1].iov_base=(char*)buf; v[1].iov_len=len;
r=writev(b->fd,v,2);
if (r<0) return -1;
if ((size_t)r>=b->p) {
r-=b->p;
b->p=0;
buf+=r;
len-=r;
if (len) goto do_memcpy;
return 0;
} /* else fall through */
}
#endif
if (buffer_flush(b)==-1) return -1;
if (len>b->a) {
if (buffer_stubborn(b->op,b->fd,buf,len,b)<0) return -1;
return 0;
}
}
do_memcpy:
memcpy(b->x+b->p, buf, len);
b->p+=len;
return 0;
}
|
