2.9BSD - /usr/src/ucb/csh/getpwent.c

   1: static  char *sccsid = "@(#)getpwent.c 4.1 10/9/80";
   2: 
   3: #include <pwd.h>
   4: 
   5: #undef  BUFSIZ
   6: #define BUFSIZ  160
   7: 
   8: static int pwf = -1;
   9: static char line[BUFSIZ+1];
  10: static struct passwd passwd;
  11: 
  12: setpwent()
  13: {
  14:     if( pwf == -1 )
  15:         pwf = open( "/etc/passwd", 0 );
  16:     else
  17:         lseek(pwf, 0l, 0);
  18: }
  19: 
  20: endpwent()
  21: {
  22:     if( pwf != -1 ){
  23:         close( pwf );
  24:         pwf = -1;
  25:     }
  26: }
  27: 
  28: static char *
  29: pwskip(p)
  30: register char *p;
  31: {
  32:     while( *p && *p != ':' )
  33:         ++p;
  34:     if( *p ) *p++ = 0;
  35:     return(p);
  36: }
  37: 
  38: struct passwd *
  39: getpwent()
  40: {
  41:     register char *p, *q;
  42:     register int i, j;
  43: 
  44:     if (pwf == -1) {
  45:         if( (pwf = open( "/etc/passwd", 0 )) == -1 )
  46:             return(0);
  47:     }
  48:     i = read(pwf, line, BUFSIZ);
  49:     for (j = 0; j < i; j++)
  50:         if (line[j] == '\n')
  51:             break;
  52:     if (j >= i)
  53:         return(0);
  54:     line[++j] = 0;
  55:     lseek(pwf, (long) (j - i), 1);
  56:     p = line;
  57:     passwd.pw_name = p;
  58:     p = pwskip(p);
  59: /*	passwd.pw_passwd = p; */
  60:     p = q = pwskip(p);
  61: /*	passwd.pw_uid = atoi(p); */
  62:     p = pwskip(p);
  63:     p[-1] = 0;
  64:     passwd.pw_uid = atou(q);
  65: /*	passwd.pw_gid = atoi(p); */
  66: /*	passwd.pw_quota = 0; */
  67: /*	passwd.pw_comment = ""; */
  68:     q = p;
  69:     p = pwskip(p);
  70:     p[-1] = 0;
  71:     passwd.pw_gid = atou(q);
  72: /*	passwd.pw_gecos = p; */
  73:     p = pwskip(p);
  74:     passwd.pw_dir = p;
  75:     p = pwskip(p);
  76: /*	passwd.pw_shell = p; */
  77: /* 	while(*p && *p != '\n') p++; */
  78:     *p = '\0';
  79:     return(&passwd);
  80: }
  81: 
  82: atou(p)
  83:     register char *p;
  84: {
  85:     register int i = 0;
  86: 
  87:     if (p != 0)
  88:         while (*p)
  89:             i = i * 10 + *p++ - '0';
  90:     return (i);
  91: }

Defined functions

Defined variables

Defined macros