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[smlnj] View of /sml/trunk/src/runtime/c-libs/posix-io/read.c
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View of /sml/trunk/src/runtime/c-libs/posix-io/read.c

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Revision 224 - (download) (as text) (annotate)
Sat Apr 17 16:27:01 1999 UTC (21 years, 3 months ago) by monnier
File size: 1103 byte(s)
This commit was generated by cvs2svn to compensate for changes in r223,
which included commits to RCS files with non-trunk default branches.
/* read.c
 * COPYRIGHT (c) 1995 by AT&T Bell Laboratories.

#include "ml-unixdep.h"
#include <unistd.h>
#include "ml-base.h"
#include "ml-values.h"
#include "ml-objects.h"
#include "ml-c.h"
#include "cfun-proto-list.h"

/* _ml_P_IO_read : (int * int) -> Word8Vector.vector
 *                  fd    nbytes
 * Read the specified number of bytes from the specified file,
 * returning them in a vector.
ml_val_t _ml_P_IO_read (ml_state_t *msp, ml_val_t arg)
    int		    fd = REC_SELINT(arg, 0);
    int		    nbytes = REC_SELINT(arg, 1);
    ml_val_t	    vec, res;
    int		    n;

    if (nbytes == 0)
	return ML_string0;

  /* allocate the vector; note that this might cause a GC */
    vec = ML_AllocRaw32 (msp, BYTES_TO_WORDS(nbytes));
    n = read (fd, PTR_MLtoC(char, vec), nbytes);
    if (n < 0)
	return RAISE_SYSERR(msp, n);
    else if (n == 0)
	return ML_string0;

    if (n < nbytes) {
      /* we need to shrink the vector */
	ML_ShrinkRaw32 (msp, vec, BYTES_TO_WORDS(n));

    SEQHDR_ALLOC (msp, res, DESC_string, vec, n);

    return res;

} /* end of _ml_P_IO_read */

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