1argv-array API 2============== 3 4The argv-array API allows one to dynamically build and store 5NULL-terminated lists. An argv-array maintains the invariant that the 6`argv` member always points to a non-NULL array, and that the array is 7always NULL-terminated at the element pointed to by `argv[argc]`. This 8makes the result suitable for passing to functions expecting to receive 9argv from main(), or the link:api-run-command.html[run-command API]. 10 11The link:api-string-list.html[string-list API] is similar, but cannot be 12used for these purposes; instead of storing a straight string pointer, 13it contains an item structure with a `util` field that is not compatible 14with the traditional argv interface. 15 16Each `argv_array` manages its own memory. Any strings pushed into the 17array are duplicated, and all memory is freed by argv_array_clear(). 18 19Data Structures 20--------------- 21 22`struct argv_array`:: 23 24 A single array. This should be initialized by assignment from 25 `ARGV_ARRAY_INIT`, or by calling `argv_array_init`. The `argv` 26 member contains the actual array; the `argc` member contains the 27 number of elements in the array, not including the terminating 28 NULL. 29 30Functions 31--------- 32 33`argv_array_init`:: 34 Initialize an array. This is no different than assigning from 35 `ARGV_ARRAY_INIT`. 36 37`argv_array_push`:: 38 Push a copy of a string onto the end of the array. 39 40`argv_array_pushl`:: 41 Push a list of strings onto the end of the array. The arguments 42 should be a list of `const char *` strings, terminated by a NULL 43 argument. 44 45`argv_array_pushf`:: 46 Format a string and push it onto the end of the array. This is a 47 convenience wrapper combining `strbuf_addf` and `argv_array_push`. 48 49`argv_array_pushv`:: 50 Push a null-terminated array of strings onto the end of the array. 51 52`argv_array_pop`:: 53 Remove the final element from the array. If there are no 54 elements in the array, do nothing. 55 56`argv_array_clear`:: 57 Free all memory associated with the array and return it to the 58 initial, empty state. 59 60`argv_array_detach`:: 61 Disconnect the `argv` member from the `argv_array` struct and 62 return it. The caller is responsible for freeing the memory used 63 by the array, and by the strings it references. After detaching, 64 the `argv_array` is in a reinitialized state and can be pushed 65 into again.