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Annotation of 42BSD/usr.lib/libU77/fseek_.c, revision 1.1

1.1     ! root        1: /*
        !             2: char id_fseek[] = "@(#)fseek_.c        1.2";
        !             3:  *
        !             4:  * position a file associated with a fortran logical unit
        !             5:  *
        !             6:  * calling sequence:
        !             7:  *     ierror = fseek(lunit, ioff, ifrom)
        !             8:  * where:
        !             9:  *     lunit is an open logical unit
        !            10:  *     ioff is an offset in bytes relative to the position specified by ifrom
        !            11:  *     ifrom   - 0 means 'beginning of the file'
        !            12:  *             - 1 means 'the current position'
        !            13:  *             - 2 means 'the end of the file'
        !            14:  *     ierror will be 0 if successful, a system error code otherwise.
        !            15:  */
        !            16: 
        !            17: #include       <stdio.h>
        !            18: #include       "../libI77/f_errno.h"
        !            19: #include       "../libI77/fiodefs.h"
        !            20: 
        !            21: extern unit units[];
        !            22: 
        !            23: long fseek_(lu, off, from)
        !            24: long *lu, *off, *from;
        !            25: {
        !            26:        if (*lu < 0 || *lu >= MXUNIT)
        !            27:                return((long)(errno=F_ERUNIT));
        !            28:        if (*from < 0 || *from > 2)
        !            29:                return((long)(errno=F_ERARG));
        !            30:        if (!units[*lu].ufd)
        !            31:                return((long)(errno=F_ERNOPEN));
        !            32:        if (fseek(units[*lu].ufd, *off, (int)*from) < 0)
        !            33:                return((long)errno);
        !            34:        return(0L);
        !            35: }

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