mirror of
https://github.com/pygos/init.git
synced 2024-11-22 19:19:47 +01:00
130 lines
4.2 KiB
C
130 lines
4.2 KiB
C
/* 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;
|
|
|
|
|
|
typedef struct {
|
|
int fd; /* input file descriptor */
|
|
const char *argstr; /* if not NULL, read from this instead */
|
|
|
|
const char *filename; /* input file name */
|
|
size_t lineno; /* current line number */
|
|
|
|
size_t i; /* buffer offset */
|
|
char buffer[256]; /* current line, null-terminated */
|
|
|
|
int argc;
|
|
const char *const *argv;
|
|
|
|
bool string; /* inside a string? */
|
|
bool escape; /* reading an escape sequence? */
|
|
bool comment; /* inside a comment */
|
|
} rdline_t;
|
|
|
|
|
|
/*
|
|
Initialize the config line scanner.
|
|
|
|
The scanner reads from the provided fd. The filename is used for
|
|
error reporting. An argument count and vector can be set for argument
|
|
substitution in rdline.
|
|
*/
|
|
void rdline_init(rdline_t *t, int fd, const char *filename,
|
|
int argc, const char *const *argv);
|
|
|
|
/*
|
|
Read from file until end-of-file or a line feed is encountered.
|
|
|
|
Returns -1 on failure, +1 if end of file was reached,
|
|
0 if data was read successfully.
|
|
|
|
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.
|
|
- 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. 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.
|
|
- If the resulting line is empty, processing is restarted.
|
|
*/
|
|
int rdline(rdline_t *t);
|
|
|
|
/*
|
|
Remove double quotes ('"') from a string and substitute escape
|
|
sequences in between double quotes.
|
|
*/
|
|
int unescape(char *src);
|
|
|
|
/*
|
|
Replace spaces in 'str' with null bytes. Tread strings (started and
|
|
terminated with double-quotes which can be escaped) as a single block.
|
|
Such strings are run through unescap(). All elements are tightly
|
|
packed together and the function returns the number of consecutive
|
|
argument strings that are now inside 'str'.
|
|
|
|
Returns a negative value if unescape() fails, a string is not
|
|
termianted or two such strings touch each other without a white
|
|
space in between.
|
|
*/
|
|
int pack_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 */
|
|
|