lflread.c File Reference

#include <xinu.h>

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Functions
devcall	lflread (struct dentry *devptr, char *buff, int32 count)

Function Documentation

lflread()

devcall lflread	(	struct dentry *	devptr,
		char *	buff,
		int32	count
	)

Definition at line 9 of file lflread.c.

References EOF, lflgetc(), and SYSERR.

{
    uint32  numread;        /* Number of bytes read     */
    int32   nxtbyte;        /* Character or SYSERR/EOF  */

    if (count < 0) {
        return SYSERR;
    }

    /* Iterate and use lflgetc to read individual bytes */

    for (numread=0 ; numread < count ; numread++) {
        nxtbyte = lflgetc(devptr);
        if (nxtbyte == SYSERR) {
            return SYSERR;
        } else if (nxtbyte == EOF) {    /* EOF before finished */
            if (numread == 0) {
            return EOF;
            } else {
            return numread;
            }
        } else {
            *buff++ = (char) (0xff & nxtbyte);
        }
    }
    return numread;
}

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