06-09-2016
I'm glad you got it to work. If you'd like to show us how you changed the code to perform the rounding you wanted, we might be able to offer suggestions for alternative ways to do it. (And, having your completed solution in the thread helps others who may have a similar problem in the future if they can see how you solved the problem.)
If field 8 always 6 characters? Or, can the length of that field vary from file to file too? (Making that field variable length isn't complicated, if the length varies.)
Can the original value in field 8 ever appear as the value of field 2, 3, 4, 5, 6, or 7 in any of your input files? (As long as the 1st field is always left aligned and the aren't any empty fields in your input files, it wouldn't be too hard to be sure that field 8 is modified in the output and not an earlier field with the same contents. But, the code is faster and simpler as provided in RudiC's suggestion if this isn't a concern for your input files.)
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LEARN ABOUT DEBIAN
gd_validate
gd_validate(3) GETDATA gd_validate(3)
NAME
gd_validate -- check a dirfile field code for validity
SYNOPSIS
#include <getdata.h>
int gd_validate(DIRFILE *dirfile, const char *field_code);
DESCRIPTION
The gd_validate() function queries a dirfile(5) database specified by dirfile and checks whether field_code, which may contain a represen-
tation suffix, specifies a valid field.
The dirfile argument must point to a valid DIRFILE object previously created by a call to gd_open(3).
This function checks whether the field and its input fields (if any) are found, whether the representation suffix (if any) is valid, and
also that all non-literal parameters specify valid scalar fields.
RETURN VALUE
If all checks pass, gd_validate() returns zero. On error, it returns -1 and sets the dirfile error to a non-zero error value. Possible
error values are:
GD_E_BAD_CODE
The field specified by field_code or one of the fields it uses as input was not found in the database.
GD_E_BAD_DIRFILE
The supplied dirfile was invalid.
GD_E_BAD_REPR
The representation suffix specified in field_code was not recognised.
GD_E_BAD_SCALAR
A non-literal scalar used in the definition of the field or one of its inputs was not found, or was not a CONST or CARRAY field.
GD_E_DIMENSION
A scalar field was found where a vector field was expected.
GD_E_RECURSE_LEVEL
Too many levels of recursion were encountered while trying to resolve field_code. This usually indicates a circular dependency in
field specification in the dirfile.
The dirfile error may be retrieved by calling gd_error(3). A descriptive error string for the last error encountered can be obtained from
a call to gd_error_string(3).
NOTES
It is not necessary to call this function before passing a field code to another GetData function: all functions which accept field codes
perform these checks themselves.
SEE ALSO
dirfile(5), gd_getdata(3), gd_error(3), gd_error_string(3), gd_open(3)
Version 0.7.0 3 November 2010 gd_validate(3)