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98 lines
3.5 KiB
C
98 lines
3.5 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 LIBCONFIG_H
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#define LIBCONFIG_H
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#include <stdbool.h>
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typedef struct {
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int fd; /* input file descriptor */
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const char *argstr; /* if not NULL, read from this instead */
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const char *filename; /* input file name */
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size_t lineno; /* current line number */
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size_t i; /* buffer offset */
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char buffer[256]; /* current line, null-terminated */
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int argc;
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const char *const *argv;
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bool string; /* inside a string? */
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bool escape; /* reading an escape sequence? */
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bool comment; /* inside a comment */
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} rdline_t;
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/*
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Initialize the config line scanner.
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The scanner reads from the provided fd. The filename is used for
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error reporting. An argument count and vector can be set for argument
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substitution in rdline.
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*/
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void rdline_init(rdline_t *t, int fd, const char *filename,
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int argc, const char *const *argv);
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/*
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Read from file until end-of-file or a line feed is encountered.
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Returns -1 on failure, +1 if end of file was reached,
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0 if data was read successfully.
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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.
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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. On success,
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the argv value is inserted and processed 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.
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- If the resulting line is empty, processing is restarted.
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*/
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int rdline(rdline_t *t);
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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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Replace spaces in 'str' with null bytes. Tread strings (started and
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terminated with double-quotes which can be escaped) as a single block.
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Such strings are run through unescap(). All elements are tightly
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packed together and the function returns the number of consecutive
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argument strings that are now inside 'str'.
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Returns a negative value if unescape() fails, a string is not
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termianted or two such strings touch each other without a white
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space in between.
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*/
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int pack_argv(char *str);
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#endif /* LIBCONFIG_H */
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