iarray_allocate(3) Library Functions Manual iarray_allocate(3)NAME
iarray_allocate - get pointer to nth element in iarray
SYNTAX
#include <iarray.h>
void* iarray_allocate(iarray* x, size_t pos);
iarray x;
size_t pos;
t* p = iarray_allocate(&x,pos);
DESCRIPTION
iarray_allocate is similar to iarray_get, but if the requested element is not in the array, the array will be resized. If the resize
fails, iarray_allocate returns NULL and leaves the array untouched.
This function is safe to use in environments with multiple threads, but it can block for indeterminate time if other threads are reallocat-
ing the array at the same time.
Note that it is safe to use iarray_allocate where you would otherwise use iarray_get. The only reason to use iarray_get over iarray_allo-
cate would be optimization.
RETURN VALUE
Return a pointer to the requested element. If there was a memory allocation failure, returns NULL.
SEE ALSO iarray_init(3), iarray_get(3), iarray_free(3)iarray_allocate(3)
Check Out this Related Man Page
LSEARCH(3) BSD Library Functions Manual LSEARCH(3)NAME
lfind, lsearch -- linear search and append
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <search.h>
void *
lfind(const void *key, const void *base, size_t *nelp, size_t width, int (*compar)(const void *, const void *));
void *
lsearch(const void *key, void *base, size_t *nelp, size_t width, int (*compar)(const void *, const void *));
DESCRIPTION
The lsearch() and lfind() functions walk linearly through an array, comparing each element with the one to be sought, by means of a supplied
comparison function.
The key argument points to an element that matches the one that is searched. The array's address in memory is denoted by the base argument.
The width of one element (i.e., the size as returned by sizeof()) is passed as the width argument. The number of valid elements contained in
the array (not the number of elements the array has space reserved for) is given in the integer pointed to by nelp. The compar argument
points to a function which compares its two arguments and returns zero if they are matching, and non-zero otherwise.
If no matching element was found in the array, lsearch() copies key into the position after the last element and increments the integer
pointed to by nelp.
RETURN VALUES
The lsearch() and lfind() functions return a pointer to the first element found. If no element was found, lsearch() returns a pointer to the
newly added element, whereas lfind() returns NULL. Both functions return NULL if an error occurs.
SEE ALSO bsearch(3), hsearch(3), tsearch(3)STANDARDS
The lsearch() and lfind() functions conform to IEEE Std 1003.1-2001 (``POSIX.1'').
HISTORY
The lsearch() and lfind() functions appeared in 4.2BSD. In FreeBSD 5.0, they reappeared conforming to IEEE Std 1003.1-2001 (``POSIX.1'').
BSD October 11, 2002 BSD
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