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git/strvec.h

91 lines
2.8 KiB

#ifndef STRVEC_H
#define STRVEC_H
/**
* The strvec API allows one to dynamically build and store
* NULL-terminated arrays of strings. A strvec maintains the invariant that the
* `items` member always points to a non-NULL array, and that the array is
* always NULL-terminated at the element pointed to by `items[nr]`. 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 `strvec` manages its own memory. Any strings pushed into the
* array are duplicated, and all memory is freed by strvec_clear().
*/
extern const char *empty_strvec[];
/**
* A single array. This should be initialized by assignment from
* `STRVEC_INIT`, or by calling `strvec_init`. The `items`
* member contains the actual array; the `nr` member contains the
* number of elements in the array, not including the terminating
* NULL.
*/
struct strvec {
const char **v;
size_t nr;
size_t alloc;
};
#define STRVEC_INIT { \
.v = empty_strvec, \
}
/**
* Initialize an array. This is no different than assigning from
* `STRVEC_INIT`.
*/
void strvec_init(struct strvec *);
/* Push a copy of a string onto the end of the array. */
const char *strvec_push(struct strvec *, const char *);
/**
* Format a string and push it onto the end of the array. This is a
* convenience wrapper combining `strbuf_addf` and `strvec_push`.
*/
__attribute__((format (printf,2,3)))
const char *strvec_pushf(struct strvec *, 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 strvec_pushl(struct strvec *, ...);
/* Push a null-terminated array of strings onto the end of the array. */
void strvec_pushv(struct strvec *, const char **);
/**
* Remove the final element from the array. If there are no
* elements in the array, do nothing.
*/
void strvec_pop(struct strvec *);
/* Splits by whitespace; does not handle quoted arguments! */
void strvec_split(struct strvec *, const char *);
/**
* Free all memory associated with the array and return it to the
* initial, empty state.
*/
void strvec_clear(struct strvec *);
/**
* Disconnect the `items` member from the `strvec` 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 `strvec` is in a reinitialized state and can be pushed
* into again.
*/
const char **strvec_detach(struct strvec *);
#endif /* STRVEC_H */