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Viewing file:     api-argv-array.txt (2.12 KB)      -rw-r--r--

argv-array API
==============

The argv-array API allows one to dynamically build and store
NULL-terminated lists.  An argv-array maintains the invariant that the
`argv` member always points to a non-NULL array, and that the array is
always NULL-terminated at the element pointed to by `argv[argc]`. This
makes the result suitable for passing to functions expecting to receive
argv from main(), or the link:api-run-command.html[run-command API].

The link:api-string-list.html[string-list API] is similar, but cannot be
used for these purposes; instead of storing a straight string pointer,
it contains an item structure with a `util` field that is not compatible
with the traditional argv interface.

Each `argv_array` manages its own memory. Any strings pushed into the
array are duplicated, and all memory is freed by argv_array_clear().

Data Structures
---------------

`struct argv_array`::

	A single array. This should be initialized by assignment from
	`ARGV_ARRAY_INIT`, or by calling `argv_array_init`. The `argv`
	member contains the actual array; the `argc` member contains the
	number of elements in the array, not including the terminating
	NULL.

Functions
---------

`argv_array_init`::
	Initialize an array. This is no different than assigning from
	`ARGV_ARRAY_INIT`.

`argv_array_push`::
	Push a copy of a string onto the end of the array.

`argv_array_pushl`::
	Push a list of strings onto the end of the array. The arguments
	should be a list of `const char *` strings, terminated by a NULL
	argument.

`argv_array_pushf`::
	Format a string and push it onto the end of the array. This is a
	convenience wrapper combining `strbuf_addf` and `argv_array_push`.

`argv_array_pop`::
	Remove the final element from the array. If there are no
	elements in the array, do nothing.

`argv_array_clear`::
	Free all memory associated with the array and return it to the
	initial, empty state.

`argv_array_detach`::
	Detach the argv array from the `struct argv_array`, transferring
	ownership of the allocated array and strings.

`argv_array_free_detached`::
	Free the memory allocated by a `struct argv_array` that was later
	detached and is now no longer needed.