1 d957951b 2005-02-11 devnull #include <u.h>
  2 d957951b 2005-02-11 devnull #include <libc.h>
  3 d957951b 2005-02-11 devnull #include <bio.h>
  4 d957951b 2005-02-11 devnull #include <ndb.h>
  5 d957951b 2005-02-11 devnull #include <ndbhf.h>
  6 d957951b 2005-02-11 devnull 
  7 d957951b 2005-02-11 devnull /*
  8 d957951b 2005-02-11 devnull  *  search for a tuple that has the given 'attr=val' and also 'rattr=x'.
  9 d957951b 2005-02-11 devnull  *  copy 'x' into 'buf' and return the whole tuple.
 10 d957951b 2005-02-11 devnull  *
 11 d957951b 2005-02-11 devnull  *  return 0 if not found.
 12 d957951b 2005-02-11 devnull  */
 13 d957951b 2005-02-11 devnull char*
 14 d957951b 2005-02-11 devnull csgetvalue(char *netroot, char *attr, char *val, char *rattr, Ndbtuple **pp)
 15 d957951b 2005-02-11 devnull {
 16 d957951b 2005-02-11 devnull 	Ndbtuple *t, *first, *last;
 17 d957951b 2005-02-11 devnull 	int n, linefound;
 18 d957951b 2005-02-11 devnull 	char line[1024];
 19 d957951b 2005-02-11 devnull 	int fd;
 20 d957951b 2005-02-11 devnull 	int oops = 0;
 21 d957951b 2005-02-11 devnull 	char *rv;
 22 d957951b 2005-02-11 devnull 
 23 d957951b 2005-02-11 devnull 	if(pp)
 24 d957951b 2005-02-11 devnull 		*pp = nil;
 25 d957951b 2005-02-11 devnull 	rv = nil;
 26 d957951b 2005-02-11 devnull 
 27 d957951b 2005-02-11 devnull 	if(netroot)
 28 d957951b 2005-02-11 devnull 		snprint(line, sizeof(line), "%s/cs", netroot);
 29 d957951b 2005-02-11 devnull 	else
 30 d957951b 2005-02-11 devnull 		strcpy(line, "/net/cs");
 31 d957951b 2005-02-11 devnull 	fd = open(line, ORDWR);
 32 d957951b 2005-02-11 devnull 	if(fd < 0)
 33 d957951b 2005-02-11 devnull 		return 0;
 34 d957951b 2005-02-11 devnull 	seek(fd, 0, 0);
 35 d957951b 2005-02-11 devnull 	snprint(line, sizeof(line), "!%s=%s %s=*", attr, val, rattr);
 36 d957951b 2005-02-11 devnull 	if(write(fd, line, strlen(line)) < 0){
 37 d957951b 2005-02-11 devnull 		close(fd);
 38 d957951b 2005-02-11 devnull 		return 0;
 39 d957951b 2005-02-11 devnull 	}
 40 d957951b 2005-02-11 devnull 	seek(fd, 0, 0);
 41 d957951b 2005-02-11 devnull 
 42 d957951b 2005-02-11 devnull 	first = last = 0;
 43 d957951b 2005-02-11 devnull 	linefound = 0;
 44 d957951b 2005-02-11 devnull 	for(;;){
 45 d957951b 2005-02-11 devnull 		n = read(fd, line, sizeof(line)-2);
 46 d957951b 2005-02-11 devnull 		if(n <= 0)
 47 d957951b 2005-02-11 devnull 			break;
 48 d957951b 2005-02-11 devnull 		line[n] = '\n';
 49 d957951b 2005-02-11 devnull 		line[n+1] = 0;
 50 d957951b 2005-02-11 devnull 
 51 d957951b 2005-02-11 devnull 		t = _ndbparseline(line);
 52 d957951b 2005-02-11 devnull 		if(t == 0)
 53 d957951b 2005-02-11 devnull 			continue;
 54 d957951b 2005-02-11 devnull 		if(first)
 55 d957951b 2005-02-11 devnull 			last->entry = t;
 56 d957951b 2005-02-11 devnull 		else
 57 d957951b 2005-02-11 devnull 			first = t;
 58 d957951b 2005-02-11 devnull 		last = t;
 59 d957951b 2005-02-11 devnull 
 60 d957951b 2005-02-11 devnull 		while(last->entry)
 61 d957951b 2005-02-11 devnull 			last = last->entry;
 62 d957951b 2005-02-11 devnull 
 63 d957951b 2005-02-11 devnull 		for(; t; t = t->entry){
 64 d957951b 2005-02-11 devnull 			if(linefound == 0){
 65 d957951b 2005-02-11 devnull 				if(strcmp(rattr, t->attr) == 0){
 66 d957951b 2005-02-11 devnull 					linefound = 1;
 67 d957951b 2005-02-11 devnull 					rv = strdup(t->val);
 68 d957951b 2005-02-11 devnull 				}
 69 d957951b 2005-02-11 devnull 			}
 70 d957951b 2005-02-11 devnull 		}
 71 d957951b 2005-02-11 devnull 	}
 72 d957951b 2005-02-11 devnull 	close(fd);
 73 d957951b 2005-02-11 devnull 
 74 d957951b 2005-02-11 devnull 	if(oops){
 75 d957951b 2005-02-11 devnull 		werrstr("buffer too short");
 76 d957951b 2005-02-11 devnull 		ndbfree(first);
 77 d957951b 2005-02-11 devnull 		return nil;
 78 d957951b 2005-02-11 devnull 	}
 79 d957951b 2005-02-11 devnull 
 80 d957951b 2005-02-11 devnull 	if(pp){
 81 d957951b 2005-02-11 devnull 		setmalloctag(first, getcallerpc(&netroot));
 82 d957951b 2005-02-11 devnull 		*pp = first;
 83 d957951b 2005-02-11 devnull 	} else
 84 d957951b 2005-02-11 devnull 		ndbfree(first);
 85 d957951b 2005-02-11 devnull 
 86 d957951b 2005-02-11 devnull 	return rv;
 87 d957951b 2005-02-11 devnull }
 88 d957951b 2005-02-11 devnull 
 89 d957951b 2005-02-11 devnull Ndbtuple*
 90 d957951b 2005-02-11 devnull csgetval(char *netroot, char *attr, char *val, char *rattr, char *buf)
 91 d957951b 2005-02-11 devnull {
 92 d957951b 2005-02-11 devnull 	Ndbtuple *t;
 93 d957951b 2005-02-11 devnull 	char *p;
 94 d957951b 2005-02-11 devnull 
 95 d957951b 2005-02-11 devnull 	p = csgetvalue(netroot, attr, val, rattr, &t);
 96 d957951b 2005-02-11 devnull 	if(p == nil){
 97 d957951b 2005-02-11 devnull 		if(buf != nil)
 98 d957951b 2005-02-11 devnull 			*buf = 0;
 99 d957951b 2005-02-11 devnull 	} else {
100 d957951b 2005-02-11 devnull 		if(buf != nil){
101 d957951b 2005-02-11 devnull 			strncpy(buf, p, Ndbvlen-1);
102 d957951b 2005-02-11 devnull 			buf[Ndbvlen-1] = 0;
103 d957951b 2005-02-11 devnull 		}
104 d957951b 2005-02-11 devnull 		free(p);
105 d957951b 2005-02-11 devnull 	}
106 d957951b 2005-02-11 devnull 	return t;
107 d957951b 2005-02-11 devnull }