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50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
#include <string.h>
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#include <unistd.h>
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#ifndef __MINGW32__
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#include <sys/uio.h>
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#endif
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#include "buffer.h"
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extern ssize_t buffer_stubborn(ssize_t (*op)(),int fd,const char* buf, size_t len,void* cookie);
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#ifndef __unlikely
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#ifdef __GNUC__
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#define __unlikely(x) __builtin_expect((x),0)
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#else
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#define __unlikely(x) (x)
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#endif
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#endif
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int buffer_put(buffer* b,const char* buf,size_t len) {
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if (__unlikely(len>b->a-b->p)) { /* doesn't fit */
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#ifndef __MINGW32__
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if (b->op==write) {
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/* if it's write, we can substitute writev */
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struct iovec v[2];
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ssize_t r;
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v[0].iov_base=b->x; v[0].iov_len=b->p;
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v[1].iov_base=(char*)buf; v[1].iov_len=len;
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r=writev(b->fd,v,2);
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if (r<0) return -1;
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if ((size_t)r>=b->p) {
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r-=b->p;
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b->p=0;
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buf+=r;
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len-=r;
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if (len) goto do_memcpy;
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return 0;
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} /* else fall through */
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}
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#endif
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if (buffer_flush(b)==-1) return -1;
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if (len>b->a) {
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if (buffer_stubborn(b->op,b->fd,buf,len,b)<0) return -1;
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return 0;
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}
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}
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do_memcpy:
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memcpy(b->x+b->p, buf, len);
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b->p+=len;
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return 0;
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}
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