WCSLIB 8.2.2

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Functions
wcsutil.h File Reference

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## Functions
void | wcsdealloc (void *ptr)
| free memory allocated by WCSLIB functions.
void | wcsutil_strcvt (int n, char c, int nt, const char src[], char dst[])
| Copy character string with padding.
void | wcsutil_blank_fill (int n, char c[])
| Fill a character string with blanks.
void | wcsutil_null_fill (int n, char c[])
| Fill a character string with NULLs.
int | wcsutil_all_ival (int nelem, int ival, const int iarr[])
| Test if all elements an int array have a given value.
int | wcsutil_all_dval (int nelem, double dval, const double darr[])
| Test if all elements a double array have a given value.
int | wcsutil_all_sval (int nelem, const char *sval, const char(*sarr)[72])
| Test if all elements a string array have a given value.
int | wcsutil_allEq (int nvec, int nelem, const double *first)
| Test for equality of a particular vector element.
int | wcsutil_dblEq (int nelem, double tol, const double *arr1, const double *arr2)
| Test for equality of two arrays of type double.
int | wcsutil_intEq (int nelem, const int *arr1, const int *arr2)
| Test for equality of two arrays of type int.
int | wcsutil_strEq (int nelem, char(*arr1)[72], char(*arr2)[72])
| Test for equality of two string arrays.
void | wcsutil_setAll (int nvec, int nelem, double *first)
| Set a particular vector element.
void | wcsutil_setAli (int nvec, int nelem, int *first)
| Set a particular vector element.
void | wcsutil_setBit (int nelem, const int *sel, int bits, int *array)
| Set bits in selected elements of an array.
char * | wcsutil_fptr2str (void(*fptr)(void), char hext[19])
| Translate pointer-to-function to string.
void | wcsutil_double2str (char *buf, const char *format, double value)
| Translate double to string ignoring the locale.
int | wcsutil_str2double (const char *buf, double *value)
| Translate string to a double, ignoring the locale.
int | wcsutil_str2double2 (const char *buf, double *value)
| Translate string to doubles, ignoring the locale.

## Detailed Description

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!

## Function Documentation

## ◆ wcsdealloc()

void wcsdealloc | ( | void * | ptr | ) |

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.

Parameters

  [in,out] | ptr | Address of the allocated memory.

Returns

## ◆ wcsutil_strcvt()

void wcsutil_strcvt | ( | int | n,
|  | char | c,
|  | int | nt,
|  | const char | src[],
|  | char | dst[]
| ) |  |

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.

Parameters

  [in] | n | Maximum number of characters to copy.
  [in] | c | Substitute character, either NULL or blank (anything other than NULL).
  [in] | nt | If true, then dst is of length n+1, with the last character always set to NULL.
  [in] | src | Character string to be copied. If null-terminated, then need not be of length n, otherwise it must be.
  [out] | dst | 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.

Returns

## ◆ wcsutil_blank_fill()

void wcsutil_blank_fill | ( | int | n,
|  | char | c[]
| ) |  |

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).

Parameters

  [in] | n | Length of the sub-string.
  [in,out] | c | The character sub-string, which will not be null-terminated on return.

Returns

## ◆ wcsutil_null_fill()

void wcsutil_null_fill | ( | int | n,
|  | char | c[]
| ) |  |

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.

Parameters

  [in] | n | Number of characters.
  [in,out] | c | The character (sub-)string.

Returns

## ◆ 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.

INTERNAL USE ONLY.

wcsutil_all_ival() tests whether all elements of an array of type int all have the specified value.

Parameters

  [in] | nelem | The length of the array.
  [in] | ival | Value to be tested.
  [in] | iarr | Pointer to the first element of the array.

Returns
  Status return value:
  - 0: Not all equal.
  - 1: All equal.

## ◆ 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.

INTERNAL USE ONLY.

wcsutil_all_dval() tests whether all elements of an array of type double all have the specified value.

Parameters

  [in] | nelem | The length of the array.
  [in] | dval | Value to be tested.
  [in] | darr | Pointer to the first element of the array.

Returns
  Status return value:
  - 0: Not all equal.
  - 1: All equal.

## ◆ 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.

INTERNAL USE ONLY.

wcsutil_all_sval() tests whether the elements of an array of type char (*)[72] all have the specified value.

Parameters

  [in] | nelem | The length of the array.
  [in] | sval | String to be tested.
  [in] | sarr | Pointer to the first element of the array.

Returns
  Status return value:
  - 0: Not all equal.
  - 1: All equal.

## ◆ wcsutil_allEq()

int wcsutil_allEq | ( | int | nvec,
|  | int | nelem,
|  | const double * | first
| ) |  |

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.

Parameters

  [in] | nvec | The number of vectors.
  [in] | nelem | The length of each vector.
  [in] | first | 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];

Returns
  Status return value:
  - 0: Not all equal.
  - 1: All equal.

## ◆ wcsutil_dblEq()

int wcsutil_dblEq | ( | int | nelem,
|  | double | tol,
|  | const double * | arr1,
|  | const double * | arr2
| ) |  |

Test for equality of two arrays of type double.

INTERNAL USE ONLY.

wcsutil_dblEq() tests for equality of two double-precision arrays.

Parameters

  [in] | nelem | The number of elements in each array.
  [in] | tol | 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.
  [in] | arr1 | The first array.
  [in] | arr2 | The second array

Returns
  Status return value:
  - 0: Not equal.
  - 1: Equal.

## ◆ wcsutil_intEq()

int wcsutil_intEq | ( | int | nelem,
|  | const int * | arr1,
|  | const int * | arr2
| ) |  |

Test for equality of two arrays of type int.

INTERNAL USE ONLY.

wcsutil_intEq() tests for equality of two int arrays.

Parameters

  [in] | nelem | The number of elements in each array.
  [in] | arr1 | The first array.
  [in] | arr2 | The second array

Returns
  Status return value:
  - 0: Not equal.
  - 1: Equal.

## ◆ wcsutil_strEq()

int wcsutil_strEq | ( | int | nelem,
|  | char(*) | arr1[72],
|  | char(*) | arr2[72]
| ) |  |

Test for equality of two string arrays.

INTERNAL USE ONLY.

wcsutil_strEq() tests for equality of two string arrays.

Parameters

  [in] | nelem | The number of elements in each array.
  [in] | arr1 | The first array.
  [in] | arr2 | The second array

Returns
  Status return value:
  - 0: Not equal.
  - 1: Equal.

## ◆ wcsutil_setAll()

void wcsutil_setAll | ( | int | nvec,
|  | int | nelem,
|  | double * | first
| ) |  |

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.

Parameters

  [in] | nvec | The number of vectors.
  [in] | nelem | The length of each vector.
  [in,out] | first | 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];

Returns

## ◆ wcsutil_setAli()

void wcsutil_setAli | ( | int | nvec,
|  | int | nelem,
|  | int * | first
| ) |  |

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.

Parameters

  [in] | nvec | The number of vectors.
  [in] | nelem | The length of each vector.
  [in,out] | first | 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];

Returns

## ◆ wcsutil_setBit()

void wcsutil_setBit | ( | int | nelem,
|  | const int * | sel,
|  | int | bits,
|  | int * | array
| ) |  |

Set bits in selected elements of an array.

INTERNAL USE ONLY.

wcsutil_setBit() sets bits in selected elements of an array.

Parameters

  [in] | nelem | Number of elements in the array.
  [in] | sel | Address of a selection array of length nelem. May be specified as the null pointer in which case all elements are selected.
  [in] | bits | Bit mask.
  [in,out] | array | Address of the array of length nelem.

Returns

## ◆ wcsutil_fptr2str()

char * wcsutil_fptr2str | ( | void(*)(void) | fptr,
|  | char | hext[19]
| ) |  |

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

Parameters

  [in] | fptr |
  [out] | hext | 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'.

Returns
  The address of hext.

## ◆ wcsutil_double2str()

void wcsutil_double2str | ( | char * | buf,
|  | const char * | format,
|  | double | value
| ) |  |

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.

Parameters

  [out] | buf | The buffer to write the string into.
  [in] | format | 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.
  [in] | value | The value to convert to a string.

## ◆ wcsutil_str2double()

int wcsutil_str2double | ( | const char * | buf,
|  | double * | value
| ) |  |

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.

Parameters

  [in] | buf | The string containing the value
  [out] | value | The double value parsed from the string.

## ◆ wcsutil_str2double2()

int wcsutil_str2double2 | ( | const char * | buf,
|  | double * | value
| ) |  |

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.

Parameters

  [in] | buf | The string containing the value
  [out] | value | parts, parsed from the string.