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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


Initialize an array. This is no different than assigning from

Push a copy of a string onto the end of the array.

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

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

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

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

Detach the argv array from the `struct argv_array`, transfering
ownership of the allocated array and strings.

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