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Example:

The dsdef call above could be written in C like that:

if( !dsdef(".CHAR24","C*24",0,1,"C Character*24",&iv,&ierr))
       {
        printf("Error defining .CHAR24: %i\n",ierr);
        exit(-1);
       }

All character strings used as arguments in C calls must be NULL terminated, even if they are used to return data.

DSPACK makes no attempt to align data. The mininum data 'chunk' is a 4 byte word. The proper alignment should be ensured when defining objects. DSPACK will always assumme that objects are exacly as they are defined and once the number of 4 byte words per objects entry is calculated it is used when moving data. In particular if an element of a structure is of type character it must have the correct number of bytes independently of NULL termination.

Many routines have the list of arguments starting from

NAME
- data set name
*IVDSN*
- data set handle

Unless explicitly stated that 'name' may refer to an 'item' - the name must be a full name of a data set.

IVDSN is a data set handle. DSPACK treats it as follows:

Consequently - a separate variable should be used for ivdsn for each call. It should be preset to 0 before the first call and never touched again. Once found the handle is always valid and allows DSPACK to find the data quickly. It should be included in a SAVE statement in fortran and declared static in C.

As a convention here all returned arguments are marked with an asterisk ( arg* ) and all arguments which are both input and output are marked with preceeding and following asterisk ( *arg* )

Fortran and C calls are shown for each routine. Unless explicitly shown otherwise fortran calls are implemented as subroutines. For C calls the return value is usually the same as ierr except if the function returns a pointer.

For succesful return ierr=0.

All arguments containing names are of type character, all others are integer.



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Fri Nov 4 23:36:02 MET 1994