mars_nwe/mars-libowfat
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

use write in buffer_put for a slight perf improvement

Browse Source
This commit is contained in:
leitner
2018-03-12 13:04:30 +00:00
parent d4d9b091ef
commit 94feba3667
14 changed files with 42 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
buffer/buffer_put.c
View File

@@ -1,4 +1,8 @@
#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);
@@ -13,12 +17,32 @@ extern int buffer_stubborn(ssize_t (*op)(),int fd,const char* buf, size_t len,vo
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;