2.9BSD - /usr/src/lib/c/stdio/getpwent.c

   1: /*	@(#)getpwent.c	2.3	SCCS id keyword	*/
   2: #include <whoami.h>
   3: #include <stdio.h>
   4: #include <pwd.h>
   5: 
   6: #ifdef UCB_PWHASH
   7: #include <sys/types.h>
   8: #include <pwtable.h>
   9: #define NAMSIZ  8
  10: #endif
  11: 
  12: static char PASSWD[]    = "/etc/passwd";
  13: static char EMPTY[] = "";
  14: static FILE *pwf = NULL;
  15: static char line[BUFSIZ+1];
  16: static struct passwd passwd;
  17: 
  18: setpwent()
  19: {
  20:     if( pwf == NULL )
  21:         pwf = fopen( PASSWD, "r" );
  22:     else
  23:         rewind( pwf );
  24: }
  25: 
  26: endpwent()
  27: {
  28:     if( pwf != NULL ){
  29:         fclose( pwf );
  30:         pwf = NULL;
  31:     }
  32: #ifdef UCB_PWHASH
  33:     endmapent();
  34: #endif
  35: }
  36: 
  37: static char *
  38: pwskip(p)
  39: register char *p;
  40: {
  41:     while( *p && *p != ':' )
  42:         ++p;
  43:     if( *p ) *p++ = 0;
  44:     return(p);
  45: }
  46: 
  47: struct passwd *
  48: getpwent()
  49: {
  50:     register char *p;
  51: 
  52:     if (pwf == NULL) {
  53:         if( (pwf = fopen( PASSWD, "r" )) == NULL )
  54:             return(0);
  55:     }
  56:     p = fgets(line, BUFSIZ, pwf);
  57:     if (p==NULL)
  58:         return(0);
  59:     passwd.pw_name = p;
  60:     p = pwskip(p);
  61:     passwd.pw_passwd = p;
  62:     p = pwskip(p);
  63:     passwd.pw_uid = atoi(p);
  64:     p = pwskip(p);
  65:     passwd.pw_gid = atoi(p);
  66:     passwd.pw_quota = 0;
  67:     passwd.pw_comment = EMPTY;
  68:     p = pwskip(p);
  69:     passwd.pw_gecos = p;
  70:     p = pwskip(p);
  71:     passwd.pw_dir = p;
  72:     p = pwskip(p);
  73:     passwd.pw_shell = p;
  74:     while(*p && *p != '\n') p++;
  75:     *p = '\0';
  76: #ifdef UCB_SHELL
  77:     if (p==passwd.pw_shell)
  78:         passwd.pw_shell = UCB_SHELL;
  79: #endif
  80:     return(&passwd);
  81: }
  82: 
  83: #ifdef UCB_PWHASH
  84: struct  passwd  *
  85: getpwmap(pwt)
  86: struct  pwtable *pwt;
  87: {
  88:     struct  passwd  *p;
  89: 
  90:     if( pwt == NULL )
  91:         return(NULL);
  92:     if( pwf == NULL )
  93:         if( (pwf = fopen( PASSWD, "r" )) == NULL )
  94:             return(NULL);
  95:     if( pwt->pwt_loc == 0L )
  96:         rewind( pwf );
  97:     else {
  98:         fseek( pwf, pwt->pwt_loc - 1L, 0 );
  99:         if( getc(pwf) != '\n' )
 100:             return(NULL);
 101:     }
 102:     if( (p = getpwent()) == NULL )
 103:         return(NULL);
 104:     if( p->pw_uid != pwt->pwt_uid )
 105:         return(NULL);
 106:     if( strncmp(p->pw_name, pwt->pwt_name, NAMSIZ) )
 107:         return(NULL);
 108:     return(p);
 109: }
 110: #endif

Defined functions

Defined variables

Defined macros