# wcsutil.h File Reference

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## Functions

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_allEq (int nvec, int nelem, const double *first)
| Test for equality of a particular vector element.
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 (int(*func)(void), char hext[])
int | wcsutil_str2double (const char *buf, const char *format, double *value)
| Translate string to a double, ignoring the locale.
void | wcsutil_double2str (char *buf, const char *format, double value)
| Translate double to string ignoring the locale.

## 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

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:

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:

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.

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:

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:

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:

char* wcsutil_fptr2str | ( | int(*)(void) | func,
|  | char | hext[] |
| ) |  |  |

int wcsutil_str2double | ( | const char * | buf,
|  | const char * | format,
|  | 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
  `[in]` | format | The formatting directive, such as "lf". This may be any of the forms accepted by sscanf, but should only include a single formatting directive.
  `[out]` | value | The double value parsed from the string.

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.

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.
  `[in]` | value | The value to convert to a string.