Provided by: libgetdata-doc_0.9.0-2.2_all 
NAME
gd_madd_bit, gd_madd_carray, gd_madd_clincom, gd_madd_const, gd_madd_cpolynom,
gd_madd_crecip, gd_madd_divide, gd_madd_lincom, gd_madd_linterp, gd_madd_multiply,
gd_madd_phase, gd_madd_polynom, gd_madd_recip, gd_madd_sbit, gd_madd_string — add a field
to a dirfile
SYNOPSIS
#include <getdata.h>
int gd_madd_bit(DIRFILE *dirfile, const char *parent, const char *field_name, const char
*in_field, int bitnum, int numbits);
int gd_madd_carray(DIRFILE *dirfile, const char *parent, const char *field_name, gd_type_t
const_type, size_t array_len, gd_type_t data_type, void *value);
int gd_madd_clincom(DIRFILE *dirfile, const char *parent, const char *field_name, int
n_fields, const char **in_fields, const double complex *cm, const double complex
*cb);
int gd_madd_const(DIRFILE *dirfile, const char *parent, const char *field_name, gd_type_t
const_type, gd_type_t data_type, void *value);
int gd_madd_cpolynom(DIRFILE *dirfile, const char *parent, const char *field_name, int
poly_ord, const char *in_field, const double complex *ca);
int gd_madd_crecip(DIRFILE *dirfile, const char *parent, const char *field_name, const
char *in_field, double complex cdividend, int fragment_index);
int gd_madd_divide(DIRFILE *dirfile, const char *parent, const char *field_name, const
char *in_field1, const char *in_field2);
int gd_madd_lincom(DIRFILE *dirfile, const char *parent, const char *field_name, int
n_fields, const char **in_fields, const double *m, const double *b);
int gd_madd_linterp(DIRFILE *dirfile, const char *parent, const char *field_name, const
char *in_field, const char *table);
int gd_madd_mplex(DIRFILE *dirfile, const char *parent, const char *field_name, const char
*in_field, const char *count_field, int count_val, int period);
int gd_madd_multiply(DIRFILE *dirfile, const char *parent, const char *field_name, const
char *in_field1, const char *in_field2);
int gd_madd_polynom(DIRFILE *dirfile, const char *parent, const char *field_name, int
poly_ord, const char *in_field, const double *a);
int gd_madd_phase(DIRFILE *dirfile, const char *parent, const char *field_name, const char
*in_field, gd_shift_t shift);
int gd_madd_recip(DIRFILE *dirfile, const char *parent, const char *field_name, const char
*in_field, double dividend, int fragment_index);
int gd_madd_sbit(DIRFILE *dirfile, const char *parent, const char *field_name, const char
*in_field, int bitnum, int numbits);
int gd_madd_string(DIRFILE *dirfile, const char *parent, const char *field_name, const
char *value);
int gd_madd_window(DIRFILE *dirfile, const char *parent, const char *field_name, const
char *in_field, const char *check_field, gd_windop_t windop, gd_triplet_t
threshold);
DESCRIPTION
These functions add a new metafield of the indicated type under the parent field given by
parent in the dirfile specified by dirfile.
In all of these calls, field_name indicates the name of the field to be added. It should
not be the full <parent-field>/<meta-field> field code. The meaning and valid types of
other arguments may be obtained from the gd_entry(3) and dirfile-format(5) manual pages.
The gd_madd_clincom() and gd_madd_cpolynom() functions are identical to gd_madd_lincom()
and gd_madd_polynom(), except they take complex scalar parameters, instead of purely real
values.
The gd_madd_lincom() and gd_madd_clincom() functions take pointers to three arrays of
length n_fields containing the input field names (in_fields), the gain factors (m or cm),
and the offset terms (b or cb). Similarly, gd_madd_polynom() and gd_madd_cpolynom() take
an array of length poly_ord + 1 containing the polynomial co-efficients (a or ca).
The gd_madd_string(), gd_madd_carray, and gd_madd_const() functions both add the field and
set the value of the field to value. For gd_madd_const() and gd_madd_carray(), the
const_type argument specifies the storage type for the const, while data_type specifies
the data type of the value pointed to by value.
The gd_shift_t type is a signed 64-bit integer type. The gd_triplet_t type is defined as:
typedef union {
gd_int64_t i;
gd_uint64_t u;
double r;
} gd_triplet_t;
Which element of this gd_triplet_t union to set depends on the operator selected for the
WINDOW field. See gd_entry(3) for details.
All fields added with this interface must contain numerical parameters. Fields with
scalar fields as parameters cannot be added with these functions. Those fields must be
added with gd_madd(3) or gd_madd_spec(3). See gd_add_bit(3), &c. for an alternate way of
adding metafields with explicit parameters.
See NOTES below for information on using gd_madd_clincom(), gd_madd_cpolynom(), and
gd_madd_crecip() in the C89 GetData API.
RETURN VALUE
On success, any of these functions returns zero. On error, -1 is returned and the
dirfile error is set to a non-zero error value. Possible error values are:
GD_E_ACCMODE
The specified dirfile was opened read-only.
GD_E_ALLOC
The library was unable to allocate memory.
GD_E_BAD_CODE
The field_name argument contained invalid characters. Alternately, the parent
field code was not found, or was already a metafield.
GD_E_BAD_DIRFILE
The supplied dirfile was invalid.
GD_E_BAD_ENTRY
One or more of the field parameters specified was invalid.
GD_E_BAD_TYPE
The data_type or const_type argument provided to gd_madd_const() or
gd_madd_carray() was invalid.
GD_E_DUPLICATE
The field_name provided duplicated that of an already existing field.
GD_E_PROTECTED
The metadata of the fragment was protected from change.
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
The C89 GetData API provides different prototypes for
gd_madd_clincom(), gd_madd_cpolynom(), and gd_madd_crecip():
#define GD_C89_API
#include <getdata.h>
int gd_madd_clincom(DIRFILE *dirfile, const char *parent, const char *field_name, int
n_fields, const char **in_fields, const double *cm, const double *cb);
int gd_madd_cpolynom(DIRFILE *dirfile, const char *parent, const char *field_name, int
poly_ord, const char *in_field, const double *ca);
int gd_madd_crecip(DIRFILE *dirfile, const char *parent, const char *field_name, const
char *in_field, double cdividend[2], int fragment_index);
In this case, the array pointers passed as cm, cb or ca should have twice as many (purely
real) elements, consisting of alternating real and imaginary parts for the complex data.
That is, for example, ca[0] should be the real part of the first co-efficient, ca[1] the
imaginary part of the first co-efficient, ca[2] the real part of the second co-efficient,
ca[3] the imaginary part of the second co-efficient, and so on. Similarly, the cdividend
parameter becomes a double precision array of length two.
For gd_madd_clincom() and gd_madd_cpolynom(), these are simply different (but equivalent)
declarations of the C99 function entry point. For gd_madd_crecip(), however, a different
entry point is needed (since the cdividend parameter is passed by reference instead of by
value). In the interests of portability, the C89 version of gd_madd_crecip() is always
available, and may be accessed as gd_madd_crecip89(), with the C89 prototype, in both the
C99 and C89 APIs.
SEE ALSO
gd_add_bit(3), gd_add_const(3), gd_add_divide(3), gd_add_lincom(3), gd_add_linterp(3),
gd_add_mplex(3), gd_add_multiply(3), gd_add_phase(3), gd_add_polynom(3), gd_add_recip(3),
gd_add_string(3), gd_add_windop(3), gd_entry(3), gd_error(3), gd_error_string(3),
gd_madd(3), gd_madd_spec(3), gd_metaflush(3), gd_open(3), dirfile-format(5)