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

   1: /*	@(#)endopen.c	2.1	SCCS id keyword	*/
   2: #include    <stdio.h>
   3: #include    <errno.h>
   4: 
   5: FILE *
   6: _endopen(file, mode, iop)
   7:     char *file, *mode;
   8:     register FILE *iop;
   9: {
  10:     extern int errno;
  11:     register int rw, f;
  12: 
  13:     if (iop == NULL)
  14:         return(NULL);
  15: 
  16:     rw = mode[1] == '+';
  17: 
  18:     switch (*mode) {
  19: 
  20:     case 'w':
  21:         f = create(file, rw);
  22:         break;
  23: 
  24:     case 'a':
  25:         if ((f = open(file, rw? 2: 1)) < 0) {
  26:             if (errno == ENOENT)
  27:                 f = create(file, rw);
  28:         }
  29:         lseek(f, 0L, 2);
  30:         break;
  31: 
  32:     case 'r':
  33:         f = open(file, rw? 2: 0);
  34:         break;
  35: 
  36:     default:
  37:         return(NULL);
  38:     }
  39: 
  40:     if (f < 0)
  41:         return(NULL);
  42: 
  43:     iop->_cnt = 0;
  44:     iop->_file = f;
  45: 
  46:     if (rw)
  47:         iop->_flag |= _IORW;
  48:     else if(*mode == 'r')
  49:         iop->_flag |= _IOREAD;
  50:     else
  51:         iop->_flag |= _IOWRT;
  52: 
  53:     return(iop);
  54: }
  55: 
  56: static
  57: create(file, rw)
  58:     register char *file;
  59:     int rw;
  60: {
  61:     register int f;
  62: 
  63:     f = creat(file, 0666);
  64:     if (rw && f>=0) {
  65:         close(f);
  66:         f = open(file, 2);
  67:     }
  68:     return(f);
  69: }

Defined functions