4.3BSD - /usr/src/new/spms/src/lib/libpdb/src/pbaddkey.c

   1: /* $Header$ */
   2: 
   3: /*
   4:  * Author: Peter J. Nicklin
   5:  */
   6: 
   7: /*
   8:  * pbaddkey() inserts a key at the head of the buffer. The buffer is not
   9:  * changed if key already exists. Returns integer NO if buffer exceeded,
  10:  * otherwise YES.
  11:  */
  12: #include "pdbuf.h"
  13: #include "yesno.h"
  14: 
  15: extern char *CURPBUF;           /* current database buffer */
  16: 
  17: pbaddkey(key)
  18:     char *key;          /* key string */
  19: {
  20:     register char *bp;      /* buffer pointer */
  21:     char *pbskipkey();      /* skip to next key */
  22:     char *strncpy();        /* copy n characters */
  23:     int klen;           /* key string length */
  24:     int pbcmpkey();         /* compare keys */
  25:     int pbstretch();        /* stretch buffer */
  26:     int strlen();           /* string length */
  27: 
  28:     bp = CURPBUF;
  29:     while (*bp != _PBFS && *bp != '\0')
  30:         {
  31:         if (pbcmpkey(key, bp) == 0)
  32:             return(YES);    /* key already exists */
  33:         bp = pbskipkey(bp);
  34:         }
  35:     if (bp == CURPBUF && *bp != _PBFS)
  36:         {
  37:         *bp++ = _PBFS;      /* prepare virgin buffer */
  38:         *bp = '\0';
  39:         }
  40:     klen = strlen(key);
  41:     if (pbstretch(CURPBUF, klen+1) == NO)
  42:         return(NO);
  43:     strncpy(CURPBUF, key, klen);    /* insert key */
  44:     CURPBUF[klen] = _PBKS;      /* add key field separator */
  45:     return(YES);
  46: }

Defined functions