56 lines
1 KiB
C
56 lines
1 KiB
C
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/* $Source$
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* $State$
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* $Revision$
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*/
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#include <fcntl.h>
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#include "libsys.h"
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/*
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* Set text/binary mode for a particular fd. Assume that the fd is valid,
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* and that the mode is either O_TEXT or O_BINARY.
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*
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* Return the previous mode (either O_TEXT or O_BINARY) on success, -1 (with
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* errno set) on error.
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*/
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int _sys_setmode(int fd, int mode)
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{
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int reqbegfd = fd & ~_FDVECMASK;
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struct _fdmodes *p = &_sys_fdmodes;
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_fdvec_t mask;
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while (p->begfd != reqbegfd)
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{
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p = p->next;
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if (!p)
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{
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if (mode == O_TEXT)
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return O_TEXT;
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if ((p = sbrk(sizeof(struct _fdmodes)))
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== OUT_OF_MEMORY)
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return -1;
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p->next = _sys_fdmodes.next;
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p->begfd = reqbegfd;
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p->modevec = p->eofvec = 0;
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_sys_fdmodes.next = p;
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break;
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}
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}
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mask = (_fdvec_t)1 << (fd & _FDVECMASK);
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if (mode == O_BINARY)
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{
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if (p->modevec & mask)
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return O_BINARY;
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p->modevec |= mask;
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p->eofvec &= ~mask;
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return O_TEXT;
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}
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else
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{
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if (!(p->modevec & mask))
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return O_TEXT;
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p->modevec &= ~mask;
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return O_BINARY;
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}
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}
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