GNU Astronomy Utilities

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Some general constructs provided by Gnuastro’s FITS handling functions are discussed here. In particular there are several useful functions about FITS file names.


The maximum number of dimensions a dataset can have in FITS format, according to the FITS standard this is 999.

gal_fits_io_error (int status, char *message)

If status is non-zero, this function will print the CFITSIO error message corresponding to status, print message (optional) in the next line and abort the program. If message==NULL, it will print a default string after the CFITSIO error.

gal_fits_name_is_fits (char *name)

If the name is an acceptable CFITSIO FITS filename return 1 (one), otherwise return 0 (zero). The currently acceptable FITS suffixes are .fits, .fit, .fits.gz, .fits.Z, .imh, .fits.fz. IMH is the IRAF format which is acceptable to CFITSIO.

gal_fits_suffix_is_fits (char *suffix)

Similar to gal_fits_name_is_fits, but only for the suffix. The suffix doesn’t have to start with ‘.’: this function will return 1 (one) for both fits and .fits.

char *
gal_fits_name_save_as_string (char *filename, char *hdu)

If the name is a FITS name, then put a (hdu: ...) after it and return the string. If it isn’t a FITS file, just print the name. Note that the space is allocated. This function is useful when you want to report a random file to the user which may be FITS or not (for a FITS file, simply the filename is not enough, the HDU is also necessary).

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