lttng: list valid condition / action names if missing or unknown
[lttng-tools.git] / src / common / argpar-utils / argpar-utils.h
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1/*
2 * Copyright (C) 2021 Simon Marchi <simon.marchi@efficios.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8#ifndef COMMON_ARGPAR_UTILS_H
9#define COMMON_ARGPAR_UTILS_H
10
11#ifdef __cplusplus
12extern "C" {
13#endif
14
15#include <stdarg.h>
16
17#include <common/macros.h>
18#include <common/argpar/argpar.h>
19#include <common/string-utils/format.h>
20
21#define WHILE_PARSING_ARG_N_ARG_FMT "While parsing argument #%d (`%s`): "
22
23enum parse_next_item_status
24{
25 PARSE_NEXT_ITEM_STATUS_OK = 0,
26 PARSE_NEXT_ITEM_STATUS_END = 1,
27 PARSE_NEXT_ITEM_STATUS_ERROR = -1,
28 PARSE_NEXT_ITEM_STATUS_ERROR_MEMORY = -2,
29};
30
31/*
32 * Parse the next argpar item using `iter`.
33 *
34 * The item in `*item` is always freed and cleared on entry.
35 *
36 * If an item is parsed successfully, return the new item in `*item` and return
37 * PARSE_NEXT_ITEM_STATUS_OK.
38 *
39 * If the end of the argument list is reached, return
40 * PARSE_NEXT_ITEM_STATUS_END.
41 *
42 * On error, print a descriptive error message and return
43 * PARSE_NEXT_ITEM_STATUS_ERROR. If `context_fmt` is non-NULL, it is formatted
44 * using the following arguments and prepended to the error message.
45 * Add `argc_offset` to the argument index mentioned in the error message.
46 *
47 * If `unknown_opt_is_error` is true, an unknown option is considered an error.
48 * Otherwise, it is considered as the end of the argument list.
49 *
50 * If `error_out` is given and PARSE_NEXT_ITEM_STATUS_ERROR is returned, set
51 * `*error_out` to the argpar_error object corresponding to the error. The
52 * caller must free the object with `argpar_error_destroy`.
53 */
54ATTR_FORMAT_PRINTF(7, 8)
55enum parse_next_item_status parse_next_item(struct argpar_iter *iter,
56 const struct argpar_item **item, int argc_offset,
57 const char **argv, bool unknown_opt_is_error,
58 const struct argpar_error **error_out,
59 const char *context_fmt, ...);
60
61#ifdef __cplusplus
62}
63#endif
64#endif
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