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- /* This is file SETVBUF.C */
- /*
- ** Copyright (C) 1993 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954
- **
- ** This file is distributed under the terms listed in the document
- ** "copying.dj", available from DJ Delorie at the address above.
- ** A copy of "copying.dj" should accompany this file; if not, a copy
- ** should be available from where this file was obtained. This file
- ** may not be distributed without a verbatim copy of "copying.dj".
- **
- ** This file is distributed WITHOUT ANY WARRANTY; without even the implied
- ** warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #include <stdio.h>
-
- int setvbuf(FILE *f, char *buf, int type, int len)
- {
- int mine=0;
- if (!f)
- return -1;
- fflush(f);
- switch (type)
- {
- case _IOFBF:
- case _IOLBF:
- if (len <= 0)
- return -1;
- if (buf == 0)
- {
- buf = (char *)malloc(len);
- if (buf == 0)
- return -1;
- mine = 1;
- }
- setbuffer(f, NULL, 0);
- f->_flag &= ~_IONBF;
- f->_flag |= type;
- if (mine)
- f->_flag |= _IOMYBUF;
- f->_ptr = f->_base = buf;
- f->_bufsiz = len;
- return 0;
- case _IONBF:
- setbuffer(f, NULL, 0);
- return 0;
- default:
- return -1;
- }
- }
-