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Add argv_array_detach and argv_array_free_detached

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Allow detaching of ownership of the argv_array's contents and add a
function to free those detached argv_arrays later.

This makes it possible to use argv_array efficiently with the exiting
struct child_process which only contains a member char **argv.

Add to documentation.

Signed-off-by: Florian Achleitner <florian.achleitner.2.6.31@gmail.com>
Acked-by: David Michael Barr <b@rr-dav.id.au>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Florian Achleitner 2012-09-19 17:21:18 +02:00 committed by Junio C Hamano
parent fd871b94f6
commit df7428eca4
3 changed files with 30 additions and 0 deletions
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8
Documentation/technical/api-argv-array.txt
View File

@ -49,3 +49,11 @@ Functions
`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.

20
argv-array.c
View File

@ -59,3 +59,23 @@ void argv_array_clear(struct argv_array *array)
}
argv_array_init(array);
}
const char **argv_array_detach(struct argv_array *array, int *argc)
{
const char **argv =
array->argv == empty_argv || array->argc == 0 ? NULL : array->argv;
if (argc)
*argc = array->argc;
argv_array_init(array);
return argv;
}
void argv_array_free_detached(const char **argv)
{
if (argv) {
int i;
for (i = 0; argv[i]; i++)
free((char **)argv[i]);
free(argv);
}
}

2
argv-array.h
View File

@ -17,5 +17,7 @@ __attribute__((format (printf,2,3)))
void argv_array_pushf(struct argv_array *, const char *fmt, ...);
void argv_array_pushl(struct argv_array *, ...);
void argv_array_clear(struct argv_array *);
const char **argv_array_detach(struct argv_array *array, int *argc);
void argv_array_free_detached(const char **argv);
#endif /* ARGV_ARRAY_H */