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git/Documentation/technical/api-argv-array.txt
Jeff King 530f237500 Merge branch 'fa/remote-svn'
A GSoC project.

* fa/remote-svn:
  Add a test script for remote-svn
  remote-svn: add marks-file regeneration
  Add a svnrdump-simulator replaying a dump file for testing
  remote-svn: add incremental import
  remote-svn: Activate import/export-marks for fast-import
  Create a note for every imported commit containing svn metadata
  vcs-svn: add fast_export_note to create notes
  Allow reading svn dumps from files via file:// urls
  remote-svn, vcs-svn: Enable fetching to private refs
  When debug==1, start fast-import with "--stats" instead of "--quiet"
  Add documentation for the 'bidi-import' capability of remote-helpers
  Connect fast-import to the remote-helper via pipe, adding 'bidi-import' capability
  Add argv_array_detach and argv_array_free_detached
  Add svndump_init_fd to allow reading dumps from arbitrary FDs
  Add git-remote-testsvn to Makefile
  Implement a remote helper for svn in C
2012-10-25 06:42:02 -04:00

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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
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`, transfering
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.