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wcsutil.h
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/*============================================================================
WCSLIB 8.9 - an implementation of the FITS WCS standard.
Copyright (C) 1995-2026, Mark Calabretta
This file is part of WCSLIB.
WCSLIB is free software: you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with WCSLIB. If not, see http://www.gnu.org/licenses.
Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
http://www.atnf.csiro.au/computing/software/wcs
$Id: wcsutil.h,v 8.9 2026/06/18 13:00:03 mcalabre Exp $
*=============================================================================
*
* WCSLIB 8.9 - C routines that implement the FITS World Coordinate System
* (WCS) standard. Refer to the README file provided with WCSLIB for an
* overview of the library.
*
*
* Summary of the wcsutil routines
* -------------------------------
* Simple utility functions. With the exception of wcsdealloc(), these
* functions are intended for internal use only by WCSLIB.
*
* The internal-use functions are documented here solely as an aid to
* understanding the code. They are not intended for external use - the API
* may change without notice!
*
*
* wcsdealloc() - free memory allocated by WCSLIB functions
* --------------------------------------------------------
* wcsdealloc() invokes the free() system routine to free memory.
* Specifically, it is intended to free memory allocated (using calloc()) by
* certain WCSLIB functions (e.g. wcshdo(), wcsfixi(), fitshdr()), which it is
* the user's responsibility to deallocate.
*
* In certain situations, for example multithreading, it may be important that
* this be done within the WCSLIB sharable library's runtime environment.
*
* PLEASE NOTE: wcsdealloc() must not be used in place of the destructors for
* particular structs, such as wcsfree(), celfree(), etc.
*
* Given and returned:
* ptr void* Address of the allocated memory.
*
* Function return value:
* void
*
*
* wcsutil_strcvt() - Copy character string with padding
* -----------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_strcvt() copies one character string to another up to the specified
* maximum number of characters.
*
* If the given string is null-terminated, then the NULL character copied to
* the returned string, and all characters following it up to the specified
* maximum, are replaced with the specified substitute character, either blank
* or NULL.
*
* If the source string is not null-terminated and the substitute character is
* blank, then copy the maximum number of characters and do nothing further.
* However, if the substitute character is NULL, then the last character and
* all consecutive blank characters preceding it will be replaced with NULLs.
*
* Used by the Fortran wrapper functions in translating C strings into Fortran
* CHARACTER variables and vice versa.
*
* Given:
* n int Maximum number of characters to copy.
*
* c char Substitute character, either NULL or blank (anything
* other than NULL).
*
* nt int If true, then dst is of length n+1, with the last
* character always set to NULL.
*
* src char[] Character string to be copied. If null-terminated,
* then need not be of length n, otherwise it must be.
*
* Returned:
* dst char[] Destination character string, which must be long
* enough to hold n characters. Note that this string
* will not be null-terminated if the substitute
* character is blank.
*
* Function return value:
* void
*
*
* wcsutil_blank_fill() - Fill a character string with blanks
* ----------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_blank_fill() pads a character sub-string with blanks starting with
* the terminating NULL character (if any).
*
* Given:
* n int Length of the sub-string.
*
* Given and returned:
* c char[] The character sub-string, which will not be
* null-terminated on return.
*
* Function return value:
* void
*
*
* wcsutil_null_fill() - Fill a character string with NULLs
* --------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_null_fill() strips trailing blanks from a string (or sub-string) and
* propagates the terminating NULL character (if any) to the end of the string.
*
* If the string is not null-terminated, then the last character and all
* consecutive blank characters preceding it will be replaced with NULLs.
*
* Mainly used in the C library to strip trailing blanks from FITS keyvalues.
* Also used to make character strings intelligible in the GNU debugger, which
* prints the rubbish following the terminating NULL character, thereby
* obscuring the valid part of the string.
*
* Given:
* n int Number of characters.
*
* Given and returned:
* c char[] The character (sub-)string.
*
* Function return value:
* void
*
*
* wcsutil_all_ival() - Test if all elements an int array have a given value
* -------------------------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_all_ival() tests whether all elements of an array of type int all
* have the specified value.
*
* Given:
* nelem int The length of the array.
*
* ival int Value to be tested.
*
* iarr const int[]
* Pointer to the first element of the array.
*
* Function return value:
* int Status return value:
* 0: Not all equal.
* 1: All equal.
*
*
* wcsutil_all_dval() - Test if all elements a double array have a given value
* ---------------------------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_all_dval() tests whether all elements of an array of type double all
* have the specified value.
*
* Given:
* nelem int The length of the array.
*
* dval int Value to be tested.
*
* darr const double[]
* Pointer to the first element of the array.
*
* Function return value:
* int Status return value:
* 0: Not all equal.
* 1: All equal.
*
*
* wcsutil_all_sval() - Test if all elements a string array have a given value
* ---------------------------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_all_sval() tests whether the elements of an array of type
* char (*)[72] all have the specified value.
*
* Given:
* nelem int The length of the array.
*
* sval const char *
* String to be tested.
*
* sarr const char (*)[72]
* Pointer to the first element of the array.
*
* Function return value:
* int Status return value:
* 0: Not all equal.
* 1: All equal.
*
*
* wcsutil_allEq() - Test for equality of a particular vector element
* ------------------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_allEq() tests for equality of a particular element in a set of
* vectors.
*
* Given:
* nvec int The number of vectors.
*
* nelem int The length of each vector.
*
* first const double*
* Pointer to the first element to test in the array.
* The elements tested for equality are
*
= *first == *(first + nelem)
= == *(first + nelem*2)
= :
= == *(first + nelem*(nvec-1));
*
* The array might be dimensioned as
*
= double v[nvec][nelem];
*
* Function return value:
* int Status return value:
* 0: Not all equal.
* 1: All equal.
*
*
* wcsutil_dblEq() - Test for equality of two arrays of type double
* ----------------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_dblEq() tests for equality of two double-precision arrays.
*
* Given:
* nelem int The number of elements in each array.
*
* tol double Tolerance for comparison of the floating-point values.
* For example, for tol == 1e-6, all floating-point
* values in the arrays must be equal to the first 6
* decimal places. A value of 0 implies exact equality.
*
* arr1 const double*
* The first array.
*
* arr2 const double*
* The second array
*
* Function return value:
* int Status return value:
* 0: Not equal.
* 1: Equal.
*
*
* wcsutil_intEq() - Test for equality of two arrays of type int
* -------------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_intEq() tests for equality of two int arrays.
*
* Given:
* nelem int The number of elements in each array.
*
* arr1 const int*
* The first array.
*
* arr2 const int*
* The second array
*
* Function return value:
* int Status return value:
* 0: Not equal.
* 1: Equal.
*
*
* wcsutil_strEq() - Test for equality of two string arrays
* --------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_strEq() tests for equality of two string arrays.
*
* Given:
* nelem int The number of elements in each array.
*
* arr1 const char**
* The first array.
*
* arr2 const char**
* The second array
*
* Function return value:
* int Status return value:
* 0: Not equal.
* 1: Equal.
*
*
* wcsutil_setAll() - Set a particular vector element
* --------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_setAll() sets the value of a particular element in a set of vectors
* of type double.
*
* Given:
* nvec int The number of vectors.
*
* nelem int The length of each vector.
*
* Given and returned:
* first double* Pointer to the first element in the array, the value
* of which is used to set the others
*
= *(first + nelem) = *first;
= *(first + nelem*2) = *first;
= :
= *(first + nelem*(nvec-1)) = *first;
*
* The array might be dimensioned as
*
= double v[nvec][nelem];
*
* Function return value:
* void
*
*
* wcsutil_setAli() - Set a particular vector element
* --------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_setAli() sets the value of a particular element in a set of vectors
* of type int.
*
* Given:
* nvec int The number of vectors.
*
* nelem int The length of each vector.
*
* Given and returned:
* first int* Pointer to the first element in the array, the value
* of which is used to set the others
*
= *(first + nelem) = *first;
= *(first + nelem*2) = *first;
= :
= *(first + nelem*(nvec-1)) = *first;
*
* The array might be dimensioned as
*
= int v[nvec][nelem];
*
* Function return value:
* void
*
*
* wcsutil_setBit() - Set bits in selected elements of an array
* ------------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_setBit() sets bits in selected elements of an array.
*
* Given:
* nelem int Number of elements in the array.
*
* sel const int*
* Address of a selection array of length nelem. May
* be specified as the null pointer in which case all
* elements are selected.
*
* bits int Bit mask.
*
* Given and returned:
* array int* Address of the array of length nelem.
*
* Function return value:
* void
*
*
* wcsutil_fptr2str() - Translate pointer-to-function to string
* ------------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_fptr2str() translates a pointer-to-function to hexadecimal string
* representation for output. It is used by the various routines that print
* the contents of WCSLIB structs, noting that it is not strictly legal to
* type-pun a function pointer to void*. See
* http://stackoverflow.com/questions/2741683/how-to-format-a-function-pointer
*
* Given:
* fptr void(*)() Pointer to function.
*
* Returned:
* hext char[19] Null-terminated string. Should be at least 19 bytes
* in size to accomodate a 64-bit address (16 bytes in
* hex), plus the leading "0x" and trailing '\0'.
*
* Function return value:
* char * The address of hext.
*
*
* wcsutil_double2str() - Translate double to string ignoring the locale
* ---------------------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_double2str() converts a double to a string, but unlike sprintf() it
* ignores the locale and always uses a '.' as the decimal separator. Also,
* unless it includes an exponent, the formatted value will always have a
* fractional part, ".0" being appended if necessary.
*
* Returned:
* buf char * The buffer to write the string into.
*
* Given:
* size size_t Length of buf.
*
* format char * The formatting directive, such as "%f". This
* may be any of the forms accepted by sprintf(), but
* should only include a formatting directive and
* nothing else. For "%g" and "%G" formats, unless it
* includes an exponent, the formatted value will always
* have a fractional part, ".0" being appended if
* necessary.
*
* value double The value to convert to a string.
*
*
* wcsutil_str2double() - Translate string to a double, ignoring the locale
* ------------------------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_str2double() converts a string to a double, but unlike sscanf() it
* ignores the locale and always expects a '.' as the decimal separator.
*
* Given:
* buf char * The string containing the value
*
* Returned:
* value double * The double value parsed from the string.
*
*
* wcsutil_str2double2() - Translate string to doubles, ignoring the locale
* ------------------------------------------------------------------------
* INTERNAL USE ONLY.
*
* wcsutil_str2double2() converts a string to a pair of doubles containing the
* integer and fractional parts. Unlike sscanf() it ignores the locale and
* always expects a '.' as the decimal separator.
*
* Given:
* buf char * The string containing the value
*
* Returned:
* value double[2] The double value, split into integer and fractional
* parts, parsed from the string.
*
*===========================================================================*/
#ifndef WCSLIB_WCSUTIL
#define WCSLIB_WCSUTIL
#ifdef __cplusplus
extern "C" {
#endif
void wcsdealloc(void *ptr);
void wcsutil_strcvt(int n, char c, int nt, const char src[], char dst[]);
void wcsutil_blank_fill(int n, char c[]);
void wcsutil_null_fill (int n, char c[]);
int wcsutil_all_ival(int nelem, int ival, const int iarr[]);
int wcsutil_all_dval(int nelem, double dval, const double darr[]);
int wcsutil_all_sval(int nelem, const char *sval, const char (*sarr)[72]);
int wcsutil_allEq (int nvec, int nelem, const double *first);
int wcsutil_dblEq(int nelem, double tol, const double *arr1,
const double *arr2);
int wcsutil_intEq(int nelem, const int *arr1, const int *arr2);
int wcsutil_strEq(int nelem, char (*arr1)[72], char (*arr2)[72]);
void wcsutil_setAll(int nvec, int nelem, double *first);
void wcsutil_setAli(int nvec, int nelem, int *first);
void wcsutil_setBit(int nelem, const int *sel, int bits, int *array);
char *wcsutil_fptr2str(void (*fptr)(void), char hext[19]);
void wcsutil_double2str(char *buf, size_t bsize, const char *format,
double value);
int wcsutil_str2double(const char *buf, double *value);
int wcsutil_str2double2(const char *buf, double *value);
#ifdef __cplusplus
}
#endif
#endif // WCSLIB_WCSUTIL
wcsutil_setBit
void wcsutil_setBit(int nelem, const int *sel, int bits, int *array)
Set bits in selected elements of an array.
wcsutil_all_sval
int wcsutil_all_sval(int nelem, const char *sval, const char(*sarr)[72])
Test if all elements a string array have a given value.
wcsutil_blank_fill
void wcsutil_blank_fill(int n, char c[])
Fill a character string with blanks.
wcsutil_allEq
int wcsutil_allEq(int nvec, int nelem, const double *first)
Test for equality of a particular vector element.
wcsdealloc
void wcsdealloc(void *ptr)
free memory allocated by WCSLIB functions.
wcsutil_double2str
void wcsutil_double2str(char *buf, size_t bsize, const char *format, double value)
Translate double to string ignoring the locale.
wcsutil_strcvt
void wcsutil_strcvt(int n, char c, int nt, const char src[], char dst[])
Copy character string with padding.
wcsutil_str2double2
int wcsutil_str2double2(const char *buf, double *value)
Translate string to doubles, ignoring the locale.
wcsutil_null_fill
void wcsutil_null_fill(int n, char c[])
Fill a character string with NULLs.
wcsutil_dblEq
int wcsutil_dblEq(int nelem, double tol, const double *arr1, const double *arr2)
Test for equality of two arrays of type double.
wcsutil_intEq
int wcsutil_intEq(int nelem, const int *arr1, const int *arr2)
Test for equality of two arrays of type int.
wcsutil_all_dval
int wcsutil_all_dval(int nelem, double dval, const double darr[])
Test if all elements a double array have a given value.
wcsutil_fptr2str
char * wcsutil_fptr2str(void(*fptr)(void), char hext[19])
Translate pointer-to-function to string.
wcsutil_setAli
void wcsutil_setAli(int nvec, int nelem, int *first)
Set a particular vector element.
wcsutil_strEq
int wcsutil_strEq(int nelem, char(*arr1)[72], char(*arr2)[72])
Test for equality of two string arrays.
wcsutil_str2double
int wcsutil_str2double(const char *buf, double *value)
Translate string to a double, ignoring the locale.
wcsutil_all_ival
int wcsutil_all_ival(int nelem, int ival, const int iarr[])
Test if all elements an int array have a given value.
wcsutil_setAll
void wcsutil_setAll(int nvec, int nelem, double *first)
Set a particular vector element.