diplodocus.org Git - nmh/blob - docs/historical/mh-jun-1982/Extras/libg/getpw.c

   1 #ifdef COMMENT
   2         Proprietary Rand Corporation, 1981.
   3         Further distribution of this software
   4         subject to the terms of the Rand
   5         license agreement.
   6 #endif
   7
   8
   9 struct buf {
  10
  11         int     fildes;
  12         int     nleft;
  13         char    *nextp;
  14         char    buff[512];
  15
  16 };
  17
  18 int pich;
  19
  20
  21 getpw(uid, buf)
  22 char *buf;
  23 {
  24         auto pbuf[259];
  25         register n, c;
  26         register char *bp;
  27
  28         if (pich == 0) pich = open("/etc/passwd",0);
  29         if (pich <  0) return(1);
  30         seek(pich,0,0);
  31         pbuf->fildes = pich;
  32         pbuf->nleft = 0;
  33         uid =& 0377;            /* not for harv unix */
  34
  35         for(;;) {
  36                 bp = buf;
  37                 while((c=pwgetc(&pbuf)) != '\n') {
  38                         if (c <= 0) return(1);
  39                         *bp++ = c;
  40                 }
  41                 *bp++ = '\0';
  42                 bp = buf;
  43                 n = 3;
  44                 while(--n)
  45                         while((c = *bp++) != ':')
  46                                 if (c == '\n') return(1);
  47                 while((c = *bp++) != ':') {
  48                         if (c < '0' || c > '9') continue;
  49                         n = n * 10 + c - '0';
  50                 }
  51                 if (n == uid) return(0);
  52         }
  53         return(1);
  54 }
  55
  56 pwgetc(buf)
  57 struct buf *buf;
  58 {
  59         register struct buf *bp;
  60
  61         bp = buf;
  62         if (--bp->nleft < 0) {
  63                 bp->nleft = read(bp->fildes,bp->buff,512)-1;
  64                 if (bp->nleft < 0) return(-1);
  65                 bp->nextp = bp->buff;
  66         }
  67         return(*bp->nextp++);
  68 }