[thirdparty/systemd.git] / src / basic / string-table.h

/* SPDX-License-Identifier: LGPL-2.1+ */

#pragma once

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>

#include "macro.h"
#include "parse-util.h"
#include "string-util.h"

ssize_t string_table_lookup(const char * const *table, size_t len, const char *key);

/* For basic lookup tables with strictly enumerated entries */
#define _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
        scope const char *name##_to_string(type i) {                    \
                if (i < 0 || i >= (type) ELEMENTSOF(name##_table))      \
                        return NULL;                                    \
                return name##_table[i];                                 \
        }

#define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope)        \
        scope type name##_from_string(const char *s) {                  \
                return (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
        }

#define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(name,type,yes,scope) \
        scope type name##_from_string(const char *s) {                  \
                int b;                                                  \
                if (!s)                                                 \
                        return -1;                                      \
                b = parse_boolean(s);                                   \
                if (b == 0)                                             \
                        return (type) 0;                                \
                else if (b > 0)                                         \
                        return yes;                                     \
                return (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
        }

#define _DEFINE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max,scope) \
        scope int name##_to_string_alloc(type i, char **str) {          \
                char *s;                                                \
                if (i < 0 || i > max)                                   \
                        return -ERANGE;                                 \
                if (i < (type) ELEMENTSOF(name##_table)) {              \
                        s = strdup(name##_table[i]);                    \
                        if (!s)                                         \
                                return -ENOMEM;                         \
                } else {                                                \
                        if (asprintf(&s, "%i", i) < 0)                  \
                                return -ENOMEM;                         \
                }                                                       \
                *str = s;                                               \
                return 0;                                               \
        }

#define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max,scope) \
        type name##_from_string(const char *s) {                        \
                type i;                                                 \
                unsigned u = 0;                                         \
                if (!s)                                                 \
                        return (type) -1;                               \
                for (i = 0; i < (type) ELEMENTSOF(name##_table); i++)   \
                        if (streq_ptr(name##_table[i], s))              \
                                return i;                               \
                if (safe_atou(s, &u) >= 0 && u <= max)                  \
                        return (type) u;                                \
                return (type) -1;                                       \
        }                                                               \


#define _DEFINE_STRING_TABLE_LOOKUP(name,type,scope)                    \
        _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
        _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope)        \
        struct __useless_struct_to_allow_trailing_semicolon__

#define _DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes,scope)   \
        _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope)          \
        _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(name,type,yes,scope) \
        struct __useless_struct_to_allow_trailing_semicolon__

#define DEFINE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,)
#define DEFINE_PRIVATE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,static)
#define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,static)
#define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,static)

#define DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes) _DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes,)

/* For string conversions where numbers are also acceptable */
#define DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(name,type,max)         \
        _DEFINE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max,)  \
        _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max,) \
        struct __useless_struct_to_allow_trailing_semicolon__

#define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max) \
        _DEFINE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max,static)
#define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max) \
        _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max,static)
Commit	Line	Data
	1	/* SPDX-License-Identifier: LGPL-2.1+ */
	2
	3	#pragma once
	4
	5	/***
	6	This file is part of systemd.
	7
	8	Copyright 2010 Lennart Poettering
	9
	10	systemd is free software; you can redistribute it and/or modify it
	11	under the terms of the GNU Lesser General Public License as published by
	12	the Free Software Foundation; either version 2.1 of the License, or
	13	(at your option) any later version.
	14
	15	systemd is distributed in the hope that it will be useful, but
	16	WITHOUT ANY WARRANTY; without even the implied warranty of
	17	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	Lesser General Public License for more details.
	19
	20	You should have received a copy of the GNU Lesser General Public License
	21	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	22	***/
	23
	24	#include <errno.h>
	25	#include <stddef.h>
	26	#include <stdio.h>
	27	#include <string.h>
	28	#include <sys/types.h>
	29
	30	#include "macro.h"
	31	#include "parse-util.h"
	32	#include "string-util.h"
	33
	34	ssize_t string_table_lookup(const char * const table, size_t len, const char key);
	35
	36	/* For basic lookup tables with strictly enumerated entries */
	37	#define _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope) \
	38	scope const char *name##_to_string(type i) { \
	39	if (i < 0 \|\| i >= (type) ELEMENTSOF(name##_table)) \
	40	return NULL; \
	41	return name##_table[i]; \
	42	}
	43
	44	#define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope) \
	45	scope type name##_from_string(const char *s) { \
	46	return (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
	47	}
	48
	49	#define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(name,type,yes,scope) \
	50	scope type name##_from_string(const char *s) { \
	51	int b; \
	52	if (!s) \
	53	return -1; \
	54	b = parse_boolean(s); \
	55	if (b == 0) \
	56	return (type) 0; \
	57	else if (b > 0) \
	58	return yes; \
	59	return (type) string_table_lookup(name##_table, ELEMENTSOF(name##_table), s); \
	60	}
	61
	62	#define _DEFINE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max,scope) \
	63	scope int name##_to_string_alloc(type i, char **str) { \
	64	char *s; \
	65	if (i < 0 \|\| i > max) \
	66	return -ERANGE; \
	67	if (i < (type) ELEMENTSOF(name##_table)) { \
	68	s = strdup(name##_table[i]); \
	69	if (!s) \
	70	return -ENOMEM; \
	71	} else { \
	72	if (asprintf(&s, "%i", i) < 0) \
	73	return -ENOMEM; \
	74	} \
	75	*str = s; \
	76	return 0; \
	77	}
	78
	79	#define _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max,scope) \
	80	type name##_from_string(const char *s) { \
	81	type i; \
	82	unsigned u = 0; \
	83	if (!s) \
	84	return (type) -1; \
	85	for (i = 0; i < (type) ELEMENTSOF(name##_table); i++) \
	86	if (streq_ptr(name##_table[i], s)) \
	87	return i; \
	88	if (safe_atou(s, &u) >= 0 && u <= max) \
	89	return (type) u; \
	90	return (type) -1; \
	91	} \
	92
	93
	94	#define _DEFINE_STRING_TABLE_LOOKUP(name,type,scope) \
	95	_DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope) \
	96	_DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,scope) \
	97	struct __useless_struct_to_allow_trailing_semicolon__
	98
	99	#define _DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes,scope) \
	100	_DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,scope) \
	101	_DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(name,type,yes,scope) \
	102	struct __useless_struct_to_allow_trailing_semicolon__
	103
	104	#define DEFINE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,)
	105	#define DEFINE_PRIVATE_STRING_TABLE_LOOKUP(name,type) _DEFINE_STRING_TABLE_LOOKUP(name,type,static)
	106	#define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(name,type,static)
	107	#define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(name,type) _DEFINE_STRING_TABLE_LOOKUP_FROM_STRING(name,type,static)
	108
	109	#define DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes) _DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(name,type,yes,)
	110
	111	/* For string conversions where numbers are also acceptable */
	112	#define DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(name,type,max) \
	113	_DEFINE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max,) \
	114	_DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max,) \
	115	struct __useless_struct_to_allow_trailing_semicolon__
	116
	117	#define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max) \
	118	_DEFINE_STRING_TABLE_LOOKUP_TO_STRING_FALLBACK(name,type,max,static)
	119	#define DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max) \
	120	_DEFINE_STRING_TABLE_LOOKUP_FROM_STRING_FALLBACK(name,type,max,static)