tndblookval.c - plan9port - [fork] Plan 9 from user space
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       ---
       tndblookval.c (791B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <bio.h>
            4 #include <ip.h>
            5 #include <ndb.h>
            6 
            7 /*
            8  *  Look for a pair with the given attribute.  look first on the same line,
            9  *  then in the whole entry.
           10  */
           11 Ndbtuple*
           12 ndbfindattr(Ndbtuple *entry, Ndbtuple *line, char *attr)
           13 {
           14         Ndbtuple *nt;
           15 
           16         /* first look on same line (closer binding) */
           17         for(nt = line; nt;){
           18                 if(strcmp(attr, nt->attr) == 0)
           19                         return nt;
           20                 nt = nt->line;
           21                 if(nt == line)
           22                         break;
           23         }
           24 
           25         /* search whole tuple */
           26         for(nt = entry; nt; nt = nt->entry)
           27                 if(strcmp(attr, nt->attr) == 0)
           28                         return nt;
           29 
           30         return nil;
           31 }
           32 
           33 Ndbtuple*
           34 ndblookval(Ndbtuple *entry, Ndbtuple *line, char *attr, char *to)
           35 {
           36         Ndbtuple *t;
           37 
           38         t = ndbfindattr(entry, line, attr);
           39         if(t != nil){
           40                 strncpy(to, t->val, Ndbvlen-1);
           41                 to[Ndbvlen-1] = 0;
           42         }
           43         return t;
           44 }