#ifndef ARGV_ARRAY_H
#define ARGV_ARRAY_H
/**
* 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().
*
* The string-list API (documented in string-list.h) 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().
*/
extern const char *empty_argv[];
/**
* 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.
*/
struct argv_array {
const char **argv;
int argc;
int alloc;
};
#define ARGV_ARRAY_INIT { empty_argv, 0, 0 }
/**
* Initialize an array. This is no different than assigning from
* `ARGV_ARRAY_INIT`.
*/
void argv_array_init(struct argv_array *);
/* Push a copy of a string onto the end of the array. */
const char *argv_array_push(struct argv_array *, const char *);
/**
* Format a string and push it onto the end of the array. This is a
* convenience wrapper combining `strbuf_addf` and `argv_array_push`.
*/
__attribute__((format (printf,2,3)))
const char *argv_array_pushf(struct argv_array *, const char *fmt, ...);
/**
* 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.
*/
LAST_ARG_MUST_BE_NULL
void argv_array_pushl(struct argv_array *, ...);
/* Push a null-terminated array of strings onto the end of the array. */
void argv_array_pushv(struct argv_array *, const char **);
/**
* Remove the final element from the array. If there are no
* elements in the array, do nothing.
*/
void argv_array_pop(struct argv_array *);
/* Splits by whitespace; does not handle quoted arguments! */
void argv_array_split(struct argv_array *, const char *);
/**
* Free all memory associated with the array and return it to the
* initial, empty state.
*/
void argv_array_clear(struct argv_array *);
/**
* Disconnect the `argv` member from the `argv_array` struct and
* return it. The caller is responsible for freeing the memory used
* by the array, and by the strings it references. After detaching,
* the `argv_array` is in a reinitialized state and can be pushed
* into again.
*/
const char **argv_array_detach(struct argv_array *);
#endif /* ARGV_ARRAY_H */
