int buffer_feed(buffer *s)
{
int r;
if (s->p) return s->p;
r = oneread(s->op,s->fd,s->x,s->n);
if (r <= 0) return r;
s->p = r;
s->n -= r;
if (s->n > 0) byte_copyr(s->x + s->n,r,s->x);
return r;
}
int main() {
memset(buf,0,sizeof(buf));
strcpy(text,"this is a test!\n");
// carp("both aligned");
byte_copy(buf,16,text);
assert(memcmp(buf,"this is a test!\n\0",18)==0);
memset(buf,0,sizeof(buf));
// carp("destination aligned, source unaligned");
byte_copy(buf,15,text+1);
assert(memcmp(buf,"his is a test!\n\0\0",18)==0);
memset(buf,0,sizeof(buf));
// carp("destination unaligned, source aligned");
byte_copy(buf+1,15,text);
assert(memcmp(buf,"\0this is a test!\0\0",18)==0);
memset(buf,0,sizeof(buf));
// carp("both unaligned");
byte_copy(buf+1,10,text+3);
assert(memcmp(buf,"\0s is a tes\0\0",14)==0);
memset(buf,0,sizeof(buf));
byte_copyr(buf,16,text);
assert(memcmp(buf,"this is a test!\n\0",18)==0);
memset(buf,0,sizeof(buf));
byte_copyr(buf,15,text+1);
assert(memcmp(buf,"his is a test!\n\0\0",18)==0);
memset(buf,0,sizeof(buf));
byte_copyr(buf+1,15,text);
assert(memcmp(buf,"\0this is a test!\0\0",18)==0);
memset(buf,0,sizeof(buf));
byte_copyr(buf+1,10,text+3);
assert(memcmp(buf,"\0s is a tes\0\0",14)==0);
memset(buf,0,sizeof(buf));
byte_copy(buf,16,text);
byte_copy(buf,16,buf+1);
assert(memcmp(buf,"his is a test!\n\0\0",18)==0);
memset(buf,0,sizeof(buf));
byte_copy(buf,16,text);
byte_copyr(buf+1,16,buf);
assert(memcmp(buf,"tthis is a test!\n",18)==0);
assert(byte_diff(text,15,"this is a test!")==0);
assert(byte_diff(text,16,"this is a test!")>0);
assert(byte_diff("this is a test!",16,text)<0);
assert(byte_chr("0123456789abcdef",17,'9')==9);
assert(byte_rchr("0123456789abcdef",17,'9')==9);
assert(byte_chr("0123456789abcdef",17,'A')==17);
assert(byte_rchr("0123456789abcdef",17,'A')==17);
byte_zero(buf,16);
assert(byte_equal(buf,16,"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"));
return 0;
}
