libwget-vector(3)

NAME
libwget-vector - Vector functions

SYNOPSIS

  Functions
wget_vector * wget_vector_create (int max, wget_vector_compare_fn *cmp)
void wget_vector_set_resize_factor (wget_vector *v, float factor)
int wget_vector_insert (wget_vector *v, const void *elem, int pos)
int wget_vector_insert_sorted (wget_vector *v, const void *elem)
int wget_vector_add_memdup (wget_vector *v, const void *elem, size_t size)
int wget_vector_add (wget_vector *v, const void *elem)
int wget_vector_add_vprintf (wget_vector *v, const char *fmt, va_list args)
int wget_vector_add_printf (wget_vector *v, const char *fmt,...)
int wget_vector_replace (wget_vector *v, const void *elem, int pos)
int wget_vector_remove (wget_vector *v, int pos)
int wget_vector_remove_nofree (wget_vector *v, int pos)
int wget_vector_move (wget_vector *v, int old_pos, int new_pos)
int wget_vector_swap (wget_vector *v, int pos1, int pos2)
void wget_vector_free (wget_vector **v)
void wget_vector_clear (wget_vector *v)
void wget_vector_clear_nofree (wget_vector *v)
int wget_vector_size (const wget_vector *v)
void * wget_vector_get (const wget_vector *v, int pos)
int wget_vector_browse (const wget_vector *v, wget_vector_browse_fn *browse, void *ctx)
void wget_vector_setcmpfunc (wget_vector *v, wget_vector_compare_fn *cmp)
void wget_vector_set_destructor (wget_vector *v, wget_vector_destructor *destructor)
void wget_vector_sort (wget_vector *v)
int wget_vector_find (const wget_vector *v, const void *elem)
bool wget_vector_contains (const wget_vector *v, const void *elem)
int wget_vector_findext (const wget_vector *v, int start, int direction, wget_vector_find_fn *find)

Detailed Description

Functions to realize vectors (growable arrays).

Function Documentation

  wget_vector * wget_vector_create (int max, wget_vector_compare_fn * cmp)

Parameters
    max Initial number of pre-allocated entries.
    cmp Comparison function for sorting/finding/sorted insertion or NULL.

Returns
    New vector instance

Create a new vector instance, to be free'd after use with wget_vector_free().

  void wget_vector_set_resize_factor (wget_vector * v, float factor)

Parameters
    v Vector
    factor Vector growth factor

Set the factor for resizing the vector when it is full.

The new size is 'factor * oldsize'. If the new size is less or equal the old size, the involved insertion function will return an error and the internal state of the vector will not change.

Default is 2.

  int wget_vector_insert (wget_vector * v, const void * elem, int pos)

Parameters
    v Vector where elem is inserted into
    elem Element to insert into v
    pos Position to insert elem at

Returns
    Index of inserted element (>= 0) or WGET_E_* on error (< 0)

Insert elem of at index pos.

elem is not cloned, the vector takes 'ownership' of the element.

An error is returned if v is NULL or pos is out of range (< 0 or > # of entries).

  int wget_vector_insert_sorted (wget_vector * v, const void * elem)

Parameters
    v Vector where elem is inserted into
    elem Element to insert into v

Returns
    Index of inserted element (>= 0) or WGET_E_* on error (< 0)

Insert elem of at a position that keeps the sort order of the elements. If the vector has no comparison function, elem will be inserted as the last element. If the elements in the vector are not sorted, they will be sorted after returning from this function.

elem is not cloned, the vector takes 'ownership' of the element.

An error is returned if v is NULL.

  int wget_vector_add_memdup (wget_vector * v, const void * elem, size_t size)

Parameters
    v Vector where elem is appended to
    elem Element to append to a v
    size Size of elem

Returns
    Index of inserted element (>= 0) or WGET_E_* on error (< 0)

Append elem of given size to vector v.

elem is cloned / copied (shallow).

An error is returned if v is NULL.

  int wget_vector_add (wget_vector * v, const void * elem)

Parameters
    v Vector where elem is appended to
    elem Element to append to a v

Returns
    Index of inserted element (>= 0) or WGET_E_* on error (< 0)

Append elem to vector v.

elem is not cloned, the vector takes 'ownership' of the element.

An error is returned if v is NULL.

  int wget_vector_add_vprintf (wget_vector * v, const char * fmt, va_list args)

Parameters
    v Vector where s is appended to
    fmt Printf-like format string
    args Arguments for the fmt

Returns
    Index of appended element (>= 0) or WGET_E_* on error (< 0)

Construct string in a printf-like manner and append it as an element to vector v.

An error is returned if v or fmt is NULL.

  int wget_vector_add_printf (wget_vector * v, const char * fmt, ...)

Parameters
    v Vector where s is appended to
    fmt Printf-like format string
    ... Arguments for the fmt

Returns
    Index of appended element (>= 0) or WGET_E_* on error (< 0)

Construct string in a printf-like manner and append it as an element to vector v.

An error is returned if v or fmt is NULL.

  int wget_vector_replace (wget_vector * v, const void * elem, int pos)

Parameters
    v Vector where elem is inserted
    elem Element to insert into v
    pos Position to insert elem at

Returns
    Index of inserted element (same as pos) (>= 0) or WGET_E_* on error (< 0)

Replace the element at position pos with elem. If the vector has an element destructor function, this is called. The old element is free'd.

elem is not cloned, the vector takes 'ownership' of the element.

An error is returned if v is NULL or pos is out of range (< 0 or > # of entries).

  int wget_vector_remove (wget_vector * v, int pos)

Parameters
    v Vector to remove an element from
    pos Position of element to remove

Returns
    Index of appended element (>= 0) or WGET_E_* on error (< 0)

Remove the element at position pos. If the vector has an element destructor function, this is called. The element is free'd.

An error is returned if v is NULL or pos is out of range (< 0 or > # of entries).

  int wget_vector_remove_nofree (wget_vector * v, int pos)

Parameters
    v Vector to remove an element from
    pos Position of element to remove

Returns
    Index of removed element (same as pos) (>= 0) or WGET_E_* on error (< 0)

Remove the element at position pos. No element destructor function is called, the element is not free'd.

An error is returned if v is NULL or pos is out of range (< 0 or > # of entries).

  int wget_vector_move (wget_vector * v, int old_pos, int new_pos)

Parameters
    v Vector to act on
    old_pos Position to move element from
    new_pos Position to move element to

Returns
    Index of new position (same as new_pos) (>= 0) or WGET_E_* on error (< 0)

Move the element at position old_pos to new_pos.

Other elements may change the position.

An error is returned if v is NULL or either old_pos or new_pos is out of range (< 0 or > # of entries).

  int wget_vector_swap (wget_vector * v, int pos1, int pos2)

Parameters
    v Vector to act on
    pos1 Position of element one
    pos2 Position of element two

Returns
    Index of second position (same as pos2) (>= 0) or WGET_E_* on error (< 0)

Swap the two elements at position pos1 and pos2.

An error is returned if v is NULL or either pos1 or pos2 is out of range (< 0 or > # of entries).

  void wget_vector_free (wget_vector ** v)

Parameters
    v Vector to be free'd

Free the vector v and it's contents.

For each element the destructor function is called and the element free'd thereafter. Then the vector itself is free'd and set to NULL.

  void wget_vector_clear (wget_vector * v)

Parameters
    v Vector to be cleared

Free all elements of the vector v but not the vector itself.

For each element the destructor function is called and the element free'd thereafter. The vector is then empty and can be reused.

  void wget_vector_clear_nofree (wget_vector * v)

Parameters
    v Vector to be cleared

Remove all elements of the vector v without free'ing them. The caller is responsible to care for the elements.

The vector is then empty and can be reused.

  int wget_vector_size (const wget_vector * v)

Parameters
    v Vector

Returns
    The number of elements in the vector v

Retrieve the number of elements of the vector v. If v is NULL, 0 is returned.

  void * wget_vector_get (const wget_vector * v, int pos)

Parameters
    v Vector
    pos Position of element to retrieve

Returns
    The element at position pos or NULL on error

Retrieve the element at position pos.

NULL is returned if v is NULL or pos is out of range (< 0 or > # of entries).

  int wget_vector_browse (const wget_vector * v, wget_vector_browse_fn * browse, void * ctx)

Parameters
    v Vector
    browse Function to be called for each element of v
    ctx Context variable use as param to browse

Returns
    Return value of the last call to browse

Call function browse for each element of vector v or until browse returns a value not equal to zero.

browse is called with ctx and the pointer to the current element.

The return value of the last call to browse is returned or 0 if v is NULL.

  void wget_vector_setcmpfunc (wget_vector * v, wget_vector_compare_fn * cmp)

Parameters
    v Vector
    cmp Function to compare elements

Set the compare function used by wget_vector_sort().

  void wget_vector_set_destructor (wget_vector * v, wget_vector_destructor * destructor)

Parameters
    v Vector
    destructor Function to be called for element destruction

Set the destructor function that is called for each element to be removed. It should not free the element (pointer) itself.

  void wget_vector_sort (wget_vector * v)

Parameters
    v Vector

Sort the elements in vector v using the compare function. Do nothing if v is NULL or the compare function is not set.

  int wget_vector_find (const wget_vector * v, const void * elem)

Parameters
    v Vector
    elem Element to search for

Returns
    Index of the found element, WGET_E_UNKNOWN if not found or WGET_E_INVALID if v was NULL or there was no comparison function set

Searches for the given element using the compare function of the vector.

  bool wget_vector_contains (const wget_vector * v, const void * elem)

Parameters
    v Vector
    elem Element to check for

Returns
    True if element exists, else false

Checks whether the element elem exists or not.

  int wget_vector_findext (const wget_vector * v, int start, int direction, wget_vector_find_fn * find)

Parameters
    v Vector
    start Index to start search from
    direction Direction of search
    find Function to be called for each element

Returns
    Index of the found element, WGET_E_UNKNOWN if not found or WGET_E_INVALID if v was NULL or there was no comparison function set

Call find for each element starting at start. If find returns 0 the current index is returned.

Author

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