Files
jehanne/sys/src/lib/ndb/ndbgetval.c
Giacomo Tesio e70feee4a3 libc: introduce "jehanne_" namespace
With this commit all functions declared in libc.h have been renamed
with the "jehanne_" prefix. This is done for several reason:

- it removes conflicts during symbol resolution when linking
  standard C libraries like newlib or musl
- it allows programs depending on a standard C library to directly
  link to a library depending on our non standard libc (eg libsec).

To ease transiction two files are provided:

- sys/include/lib9.h that can be included instead of <libc.h> to use
  the old names (via a simple set of macros)
- sys/src/lib/c/lib9.c that can be compiled with a program where the
  macro provided by lib9.h are too dumb (see for example rc or grep).

In the kernel port/lib.h has been modified accordingly and some of
the functions it directly provides has been renamed too (eg malloc
in qmalloc.c and print in devcons.c).
2017-04-19 23:48:21 +02:00

88 lines
1.7 KiB
C

/*
* This file is part of the UCB release of Plan 9. It is subject to the license
* terms in the LICENSE file found in the top-level directory of this
* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
* part of the UCB release of Plan 9, including this file, may be copied,
* modified, propagated, or distributed except according to the terms contained
* in the LICENSE file.
*/
#include <u.h>
#include <lib9.h>
#include <bio.h>
#include "ndb.h"
/*
* search for a tuple that has the given 'attr=val' and also 'rattr=x'.
* copy 'x' into 'buf' and return the whole tuple.
*
* return 0 if not found.
*/
char*
ndbgetvalue(Ndb *db, Ndbs *s, char *attr, char *val, char *rattr,
Ndbtuple **pp)
{
Ndbtuple *t, *nt;
char *rv;
Ndbs temps;
if(s == nil)
s = &temps;
if(pp)
*pp = nil;
t = ndbsearch(db, s, attr, val);
while(t){
/* first look on same line (closer binding) */
nt = s->t;
for(;;){
if(strcmp(rattr, nt->attr) == 0){
rv = strdup(nt->val);
if(pp != nil)
*pp = t;
else
ndbfree(t);
return rv;
}
nt = nt->line;
if(nt == s->t)
break;
}
/* search whole tuple */
for(nt = t; nt; nt = nt->entry){
if(strcmp(rattr, nt->attr) == 0){
rv = strdup(nt->val);
if(pp != nil)
*pp = t;
else
ndbfree(t);
return rv;
}
}
ndbfree(t);
t = ndbsnext(s, attr, val);
}
return nil;
}
Ndbtuple*
ndbgetval(Ndb *db, Ndbs *s, char *attr, char *val, char *rattr,
char *buf)
{
Ndbtuple *t;
char *p;
p = ndbgetvalue(db, s, attr, val, rattr, &t);
if(p == nil){
if(buf != nil)
*buf = 0;
} else {
if(buf != nil){
strncpy(buf, p, Ndbvlen-1);
buf[Ndbvlen-1] = 0;
}
free(p);
}
ndbsetmalloctag(t, getcallerpc());
return t;
}