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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* Copyright (C) 2018 - David Oberhollenzer
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef UTIL_H
#define UTIL_H
#include <sys/types.h>
#include <stdbool.h>
#include <stddef.h>
#include "config.h"
#ifdef __GNUC__
#define NORETURN __attribute__((noreturn))
#endif
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
typedef struct {
const char *name;
int value;
} enum_map_t;
/*
Read from fd until end-of-file or a line feed is encountered.
Returns NULL with errno set on failure. Returns NULL with errno
cleared if end-of-file is reached.
The line must be deallocated with free().
The following transformations are applied:
- Space characters are replaced with regular white space characters.
- Sequences of space characters are truncated to a single space.
- A '#' sign is interpreted as the start of a comment and removed,
together with everything that follows.
- Padding spaces are removed from the line.
- If a '"' is encounterd, the above rules are disabled, until a
after the matching '"' is read. A '"' can be escaped by preceeding
it with a backslash.
- If a second, coresponding '"' is not found, processing fails with
errno set to EILSEQ.
- If a '%' character is encountered, the next character is expected
to be a single digit index into argv. If it is not a digit or
outside the bounds set by argc, processing fails and sets errno
to EINVAL. On success, the argv value is inserted and processed
as described above.
- A '%' character can be escaped by writing '%%' or, if inside
a double quite string, by writing \%.
- An attempt to use such an indexed argument inside an argument
expansion, results in failure with errno set to ELOOP.
*/
char *rdline(int fd, int argc, const char *const *argv);
/*
Remove double quotes ('"') from a string and substitute escape
sequences in between double quotes.
*/
int unescape(char *src);
/*
Split a space seperated string into a sequence of null-terminated
strings. Return a NULL terminated array of strings pointing to the
start of each sub string.
If a double quote is encountered, the entire string up to to the next,
unescaped double quite is interpreted as a single sub string and
fed through the unescape function.
The returned array must be freed with free().
*/
char **split_argv(char *str);
/*
Search through an array of enum_map_t entries to resolve a string to
a numeric value. The end of the map is indicated by a sentinel entry
with the name set to NULL.
*/
const enum_map_t *enum_by_name(const enum_map_t *map, const char *name);
/*
Search through an array of enum_map_t entries to resolve a numeric
value to a string name. The end of the map is indicated by a sentinel
entry with the name set to NULL.
*/
const char *enum_to_name(const enum_map_t *map, int value);
#endif /* UTIL_H */
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