table of contents
gd_put_carray, gd_put_carray_slice, gd_put_constant — write CONST or CARRAY data to a dirfile database
int gd_put_carray_slice(DIRFILE *dirfile, const char *field_code, unsigned int start, size_t len, gd_type_t data_type, const void *data_in);
int gd_put_carray(DIRFILE *dirfile, const char *field_code, gd_type_t data_type, const void *data_in);
int gd_put_constant(DIRFILE *dirfile, const char *field_code, gd_type_t data_type, const void *data_in);
The gd_put_carray_slice() function writes data to a dirfile(5) database specified by dirfile into the CARRAY scalar array field_code. The data in the field is converted from the data type specified by data_type, and read from in the user-supplied buffer data_in. The location of the first element of the field into which data is stored is given by start, and the number of elements stored is given by len.
The gd_put_carray() function behaves similarly, except the whole scalar array is written, as if gd_put_carray_slice() were called with start equal zero and len equal to the value returned by gd_array_len(3). The gd_put_constant() function is equivalent to calling gd_put_carray_slice() with start equal to zero and len equal to one. None of these interfaces can write to field representations.
The argument data_in must point to a valid memory location containing all the data to be written. The number of elements which will be stored by gd_put_carray() may be obtained by calling gd_array_len(3). Unlike gd_putdata(3), writing data past the end of the field is not permitted. To add data to a CARRAY, first increase its length by calling gd_alter_carray(3), or another equivalent function.
The data_type argument should be one of the following symbols, which indicates the type of the data pointed to by data_in:
- unsigned 8-bit integer
- signed (two's complement) 8-bit integer
- unsigned 16-bit integer
- signed (two's complement) 16-bit integer
- unsigned 32-bit integer
- signed (two's complement) 32-bit integer
- unsigned 64-bit integer
- signed (two's complement) 64-bit integer
- IEEE-754 standard 32-bit single precision floating point number
- IEEE-754 standard 64-bit double precision floating point number
- C99-conformant 64-bit single precision complex number
- C99-conformant 128-bit double precision complex number
The type of the input data need not be the same as the storage type of the field. Type conversion will be performed as necessary to return the requested type. The dirfile argument must point to a valid DIRFILE object previously created by a call to gd_open(3).
On success, gd_put_carray(), gd_put_carray_slice() and gd_put_constant() return zero. On error, they return a negative-valued error code. Possible error codes are:
- The specified dirfile was opened read-only.
- The library was unable to allocate memory.
- The field specified by field_code was not found in the database.
- The supplied dirfile was invalid.
- The supplied field_code was not a CONST nor a CARRAY.
- An invalid data_type was specified.
- A request for data beyond the end of the field was made.
- An internal error occurred in the library while trying to perform the task. This indicates a bug in the library. Please report the incident to the maintainer.
- The fragment containing the constant was protected from change.
The error code is also stored in the DIRFILE object and may be retrieved after this function returns by calling gd_error(3). A descriptive error string for the error may be obtained by calling gd_error_string(3).
The put_constant() function appeared in GetData-0.4.0.
In GetData-0.7.0, this function was renamed to gd_put_constant(). The functions gd_put_carray() and gd_put_carray_slice() functions also appeared in this release.
In GetData-0.10.0, the error return from this function changed from -1 to a negative-valued error code.
dirfile(5), gd_array_len(3), gd_carrays(3), gd_error(3), gd_error_string(3), gd_get_carray_slice(3), gd_open(3), gd_put_constant(3)
|25 December 2016||Version 0.10.0|