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