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Annotation of 42BSD/usr.lib/libU77/fseek_.c, revision 1.1.1.1

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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