1 #include "buffer.h"
2 
3 extern ssize_t buffer_stubborn_read(ssize_t (*op)(),int fd,const char* buf, size_t len,void* cookie);
4 
buffer_feed(buffer * b)5 ssize_t buffer_feed(buffer* b) {
6   if (b->p==b->n) {
7     ssize_t w;
8     if ((w=buffer_stubborn_read(b->op,b->fd,b->x,b->a,b))<0)
9       return -1;
10     b->n=(size_t)w;
11     b->p=0;
12   }
13   return (ssize_t)(b->n-b->p);
14 }
15