WCSLIB 6.2

Functions
wcsutil.h File Reference

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## Functions
void | wcsutil_blank_fill (int n, char c[])
| Fill a character string with blanks. More...
void | wcsutil_null_fill (int n, char c[])
| Fill a character string with NULLs. More...
int | wcsutil_allEq (int nvec, int nelem, const double *first)
| Test for equality of a particular vector element. More...
int | wcsutil_Eq (int nelem, double tol, const double *arr1, const double *arr2)
| Test for equality of two double arrays. More...
int | wcsutil_intEq (int nelem, const int *arr1, const int *arr2)
| Test for equality of two int arrays. More...
int | wcsutil_strEq (int nelem, char(*arr1)[72], char(*arr2)[72])
| Test for equality of two string arrays. More...
void | wcsutil_setAll (int nvec, int nelem, double *first)
| Set a particular vector element. More...
void | wcsutil_setAli (int nvec, int nelem, int *first)
| Set a particular vector element. More...
void | wcsutil_setBit (int nelem, const int *sel, int bits, int *array)
| Set bits in selected elements of an array. More...
char * | wcsutil_fptr2str (void(*fptr)(void), char hext[19])
| Translate pointer-to-function to string. More...
void | wcsutil_double2str (char *buf, const char *format, double value)
| Translate double to string ignoring the locale. More...
int | wcsutil_str2double (const char *buf, double *value)
| Translate string to a double, ignoring the locale. More...
int | wcsutil_str2double2 (const char *buf, double *value)
| Translate string to doubles, ignoring the locale. More...

## Detailed Description

Simple utility functions for internal use only by WCSLIB. They 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

## ◆ wcsutil_blank_fill()

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

INTERNAL USE ONLY.

wcsutil_blank_fill() pads a character string with blanks starting with the terminating NULL character.

Used by the Fortran wrapper functions in translating C character strings into Fortran CHARACTER variables.

Parameters

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

Returns

## ◆ wcsutil_null_fill()

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

INTERNAL USE ONLY.

wcsutil_null_fill() strips off trailing blanks and pads the character array holding the string with NULL characters.

Used mainly to make character strings intelligible in the GNU debugger which prints the rubbish following the terminating NULL, obscuring the valid part of the string.

Parameters

  [in] | n | Number of characters.
  [in,out] | c | The character string.

Returns

## ◆ wcsutil_allEq()

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

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_Eq()

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

INTERNAL USE ONLY.

wcsutil_Eq() 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
| ) |  |

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]
| ) |  |

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
| ) |  |

INTERNAL USE ONLY.

wcsutil_setAll() sets the value of a particular element in a set of vectors.

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
| ) |  |

INTERNAL USE ONLY.

wcsutil_setAli() sets the value of a particular element in a set of vectors.

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
| ) |  |

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]
| ) |  |

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
| ) |  |

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
| ) |  |

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
| ) |  |

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.