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libconfig.c
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/* ----------------------------------------------------------------------------
libconfig - A library for processing structured configuration files
Copyright (C) 2005-2010 Mark A Lindner
This file is part of libconfig.
This library 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.
This library 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 Library General Public
License along with this library; if not, see
<http://www.gnu.org/licenses/>.
----------------------------------------------------------------------------
*/
#ifdef HAVE_CONFIG_H
#include "ac_config.h"
#endif
#include "libconfig.h"
#include "grammar.h"
#include "scanner.h"
#include "scanctx.h"
#include "parsectx.h"
#include "wincompat.h"
#include <locale.h>
#ifdef HAVE_XLOCALE_H
#include <xlocale.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define PATH_TOKENS ":./"
#define CHUNK_SIZE 16
#define FLOAT_PRECISION 10
#define _new(T) (T *)calloc(sizeof(T), 1) /* zeroed */
#define _delete(P) free((void *)(P))
/* ------------------------------------------------------------------------- */
#ifndef LIBCONFIG_STATIC
#if (defined(WIN32) || defined(_WIN32) || defined(__WIN32__))
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
return(TRUE);
}
#endif /* WIN32 */
#endif /* LIBCONFIG_STATIC */
/* ------------------------------------------------------------------------- */
static const char *__io_error = "file I/O error";
static void __config_list_destroy(config_list_t *list);
static void __config_write_setting(const config_setting_t *setting,
FILE *stream, int depth,
unsigned short tab_width);
extern int libconfig_yyparse(void *scanner, struct parse_context *ctx,
struct scan_context *scan_ctx);
extern int libconfig_yylex_init_extra(struct scan_context *scan_ctx,
yyscan_t *scanner);
/* ------------------------------------------------------------------------- */
static void __config_locale_override(void)
{
#if (defined(WIN32) || defined(_WIN32) || defined(__WIN32__)) \
&& ! defined(__MINGW32__)
_configthreadlocale(_ENABLE_PER_THREAD_LOCALE);
setlocale(LC_NUMERIC, "C");
#elif defined(__APPLE__)
locale_t loc = newlocale(LC_NUMERIC_MASK, "C", NULL);
uselocale(loc);
#elif ((defined HAVE_NEWLOCALE) && (defined HAVE_USELOCALE))
locale_t loc = newlocale(LC_NUMERIC, "C", NULL);
uselocale(loc);
#else
#warning "No way to modify calling thread's locale!"
#endif
}
/* ------------------------------------------------------------------------- */
static void __config_locale_restore(void)
{
#if (defined(WIN32) || defined(_WIN32) || defined(__WIN32__)) \
&& ! defined(__MINGW32__)
_configthreadlocale(_DISABLE_PER_THREAD_LOCALE);
#elif ((defined HAVE_USELOCALE) && (defined HAVE_FREELOCALE))
locale_t loc = uselocale(LC_GLOBAL_LOCALE);
freelocale(loc);
#else
#warning "No way to modify calling thread's locale!"
#endif
}
/* ------------------------------------------------------------------------- */
static int __config_name_compare(const char *a, const char *b)
{
const char *p, *q;
for(p = a, q = b; ; p++, q++)
{
int pd = ((! *p) || strchr(PATH_TOKENS, *p));
int qd = ((! *q) || strchr(PATH_TOKENS, *q));
if(pd && qd)
break;
else if(pd)
return(-1);
else if(qd)
return(1);
else if(*p < *q)
return(-1);
else if(*p > *q)
return(1);
}
return(0);
}
/* ------------------------------------------------------------------------- */
static void __config_indent(FILE *stream, int depth, unsigned short w)
{
if(w)
fprintf(stream, "%*s", (depth - 1) * w, " ");
else
{
int i;
for(i = 0; i < (depth - 1); ++i)
fputc('\t', stream);
}
}
/* ------------------------------------------------------------------------- */
static void __config_write_value(const config_value_t *value, int type,
int format, int depth,
unsigned short tab_width, FILE *stream)
{
char fbuf[64];
switch(type)
{
/* boolean */
case CONFIG_TYPE_BOOL:
fputs(value->ival ? "true" : "false", stream);
break;
/* int */
case CONFIG_TYPE_INT:
switch(format)
{
case CONFIG_FORMAT_HEX:
fprintf(stream, "0x%X", value->ival);
break;
case CONFIG_FORMAT_DEFAULT:
default:
fprintf(stream, "%d", value->ival);
break;
}
break;
/* 64-bit int */
case CONFIG_TYPE_INT64:
switch(format)
{
case CONFIG_FORMAT_HEX:
fprintf(stream, "0x" INT64_HEX_FMT "L", value->llval);
break;
case CONFIG_FORMAT_DEFAULT:
default:
fprintf(stream, INT64_FMT "L", value->llval);
break;
}
break;
/* float */
case CONFIG_TYPE_FLOAT:
{
char *q;
snprintf(fbuf, sizeof(fbuf) - 3, "%.*g", FLOAT_PRECISION, value->fval);
/* check for exponent */
q = strchr(fbuf, 'e');
if(! q)
{
/* no exponent */
if(! strchr(fbuf, '.')) /* no decimal point */
strcat(fbuf, ".0");
else
{
/* has decimal point */
char *p;
for(p = fbuf + strlen(fbuf) - 1; p > fbuf; --p)
{
if(*p != '0')
{
*(++p) = '\0';
break;
}
}
}
}
fputs(fbuf, stream);
break;
}
/* string */
case CONFIG_TYPE_STRING:
{
char *p;
fputc('\"', stream);
if(value->sval)
{
for(p = value->sval; *p; p++)
{
int c = (int)*p & 0xFF;
switch(c)
{
case '\"':
case '\\':
fputc('\\', stream);
fputc(c, stream);
break;
case '\n':
fputs("\\n", stream);
break;
case '\r':
fputs("\\r", stream);
break;
case '\f':
fputs("\\f", stream);
break;
case '\t':
fputs("\\t", stream);
break;
default:
if(c >= ' ')
fputc(c, stream);
else
fprintf(stream, "\\x%02X", c);
}
}
}
fputc('\"', stream);
break;
}
/* list */
case CONFIG_TYPE_LIST:
{
config_list_t *list = value->list;
fprintf(stream, "( ");
if(list)
{
int len = list->length;
config_setting_t **s;
for(s = list->elements; len--; s++)
{
__config_write_value(&((*s)->value), (*s)->type,
config_setting_get_format(*s),
depth + 1, tab_width, stream);
if(len)
fputc(',', stream);
fputc(' ', stream);
}
}
fputc(')', stream);
break;
}
/* array */
case CONFIG_TYPE_ARRAY:
{
config_list_t *list = value->list;
fprintf(stream, "[ ");
if(list)
{
int len = list->length;
config_setting_t **s;
for(s = list->elements; len--; s++)
{
__config_write_value(&((*s)->value), (*s)->type,
config_setting_get_format(*s),
depth + 1, tab_width, stream);
if(len)
fputc(',', stream);
fputc(' ', stream);
}
}
fputc(']', stream);
break;
}
/* group */
case CONFIG_TYPE_GROUP:
{
config_list_t *list = value->list;
if(depth > 0)
{
#ifdef K_AND_R_STYLE /* Horrendous, but many people like it. */
fputc(' ', stream);
#else
fputc('\n', stream);
if(depth > 1)
__config_indent(stream, depth, tab_width);
#endif
fprintf(stream, "{\n");
}
if(list)
{
int len = list->length;
config_setting_t **s;
for(s = list->elements; len--; s++)
__config_write_setting(*s, stream, depth + 1, tab_width);
}
if(depth > 1)
__config_indent(stream, depth, tab_width);
if(depth > 0)
fputc('}', stream);
break;
}
default:
/* this shouldn't happen, but handle it gracefully... */
fputs("???", stream);
break;
}
}
/* ------------------------------------------------------------------------- */
static void __config_list_add(config_list_t *list, config_setting_t *setting)
{
if((list->length % CHUNK_SIZE) == 0)
{
list->elements = (config_setting_t **)realloc(
list->elements,
(list->length + CHUNK_SIZE) * sizeof(config_setting_t *));
}
list->elements[list->length] = setting;
list->length++;
}
/* ------------------------------------------------------------------------- */
static config_setting_t *__config_list_search(config_list_t *list,
const char *name,
unsigned int *idx)
{
config_setting_t **found = NULL;
unsigned int i;
if(! list)
return(NULL);
for(i = 0, found = list->elements; i < list->length; i++, found++)
{
if(! (*found)->name)
continue;
if(! __config_name_compare(name, (*found)->name))
{
if(idx)
*idx = i;
return(*found);
}
}
return(NULL);
}
/* ------------------------------------------------------------------------- */
static config_setting_t *__config_list_remove(config_list_t *list, int idx)
{
config_setting_t *removed = *(list->elements + idx);
int offset = (idx * sizeof(config_setting_t *));
int len = list->length - 1 - idx;
char *base = (char *)list->elements + offset;
memmove(base, base + sizeof(config_setting_t *),
len * sizeof(config_setting_t *));
list->length--;
/* possibly realloc smaller? */
return(removed);
}
/* ------------------------------------------------------------------------- */
static void __config_setting_destroy(config_setting_t *setting)
{
if(setting)
{
if(setting->name)
_delete(setting->name);
if(setting->type == CONFIG_TYPE_STRING)
_delete(setting->value.sval);
else if((setting->type == CONFIG_TYPE_GROUP)
|| (setting->type == CONFIG_TYPE_ARRAY)
|| (setting->type == CONFIG_TYPE_LIST))
{
if(setting->value.list)
__config_list_destroy(setting->value.list);
}
if(setting->hook && setting->config->destructor)
setting->config->destructor(setting->hook);
_delete(setting);
}
}
/* ------------------------------------------------------------------------- */
static void __config_list_destroy(config_list_t *list)
{
config_setting_t **p;
unsigned int i;
if(! list)
return;
if(list->elements)
{
for(p = list->elements, i = 0; i < list->length; p++, i++)
__config_setting_destroy(*p);
_delete(list->elements);
}
_delete(list);
}
/* ------------------------------------------------------------------------- */
static int __config_vector_checktype(const config_setting_t *vector, int type)
{
/* if the array is empty, then it has no type yet */
if(! vector->value.list)
return(CONFIG_TRUE);
if(vector->value.list->length == 0)
return(CONFIG_TRUE);
/* if it's a list, any type is allowed */
if(vector->type == CONFIG_TYPE_LIST)
return(CONFIG_TRUE);
/* otherwise the first element added determines the type of the array */
return((vector->value.list->elements[0]->type == type)
? CONFIG_TRUE : CONFIG_FALSE);
}
/* ------------------------------------------------------------------------- */
static int __config_validate_name(const char *name)
{
const char *p = name;
if(*p == '\0')
return(CONFIG_FALSE);
if(! isalpha((int)*p) && (*p != '*'))
return(CONFIG_FALSE);
for(++p; *p; ++p)
{
if(! (isalpha((int)*p) || isdigit((int)*p) || strchr("*_-", (int)*p)))
return(CONFIG_FALSE);
}
return(CONFIG_TRUE);
}
/* ------------------------------------------------------------------------- */
static int __config_read(config_t *config, FILE *stream, const char *filename,
const char *str)
{
yyscan_t scanner;
struct scan_context scan_ctx;
struct parse_context parse_ctx;
YY_BUFFER_STATE buffer = NULL;
int r;
/* Reinitialize the config */
void (*destructor)(void *) = config->destructor;
const char *include_dir = config->include_dir;
unsigned short tab_width = config->tab_width;
unsigned short flags = config->flags;
config->include_dir = NULL;
config_destroy(config);
config_init(config);
config->destructor = destructor;
config->include_dir = include_dir;
config->tab_width = tab_width;
config->flags = flags;
parsectx_init(&parse_ctx);
parse_ctx.config = config;
parse_ctx.parent = config->root;
parse_ctx.setting = config->root;
__config_locale_override();
scanctx_init(&scan_ctx, filename);
scan_ctx.config = config;
libconfig_yylex_init_extra(&scan_ctx, &scanner);
if(stream)
libconfig_yyrestart(stream, scanner);
else /* read from string */
buffer = libconfig_yy_scan_string(str, scanner);
libconfig_yyset_lineno(1, scanner);
r = libconfig_yyparse(scanner, &parse_ctx, &scan_ctx);
if(r != 0)
{
YY_BUFFER_STATE buf;
config->error_file = scanctx_current_filename(&scan_ctx);
config->error_type = CONFIG_ERR_PARSE;
/* Unwind the include stack, freeing the buffers and closing the files. */
while((buf = (YY_BUFFER_STATE)scanctx_pop_include(&scan_ctx)) != NULL)
libconfig_yy_delete_buffer(buf, scanner);
}
libconfig_yylex_destroy(scanner);
config->filenames = scanctx_cleanup(&scan_ctx, &(config->num_filenames));
parsectx_cleanup(&parse_ctx);
__config_locale_restore();
return(r == 0 ? CONFIG_TRUE : CONFIG_FALSE);
}
/* ------------------------------------------------------------------------- */
int config_read(config_t *config, FILE *stream)
{
return(__config_read(config, stream, NULL, NULL));
}
/* ------------------------------------------------------------------------- */
int config_read_string(config_t *config, const char *str)
{
return(__config_read(config, NULL, NULL, str));
}
/* ------------------------------------------------------------------------- */
static void __config_write_setting(const config_setting_t *setting,
FILE *stream, int depth,
unsigned short tab_width)
{
if(depth > 1)
__config_indent(stream, depth, tab_width);
if(setting->name)
{
fputs(setting->name, stream);
fprintf(stream, " %c ", (setting->type == CONFIG_TYPE_GROUP ? ':' : '='));
}
__config_write_value(&(setting->value), setting->type,
config_setting_get_format(setting),
depth, tab_width, stream);
if(depth > 0)
{
fputc(';', stream);
fputc('\n', stream);
}
}
/* ------------------------------------------------------------------------- */
void config_write(const config_t *config, FILE *stream)
{
__config_locale_override();
__config_write_setting(config->root, stream, 0, config->tab_width);
__config_locale_restore();
}
/* ------------------------------------------------------------------------- */
int config_read_file(config_t *config, const char *filename)
{
int ret;
FILE *stream = fopen(filename, "rt");
if(! stream)
{
config->error_text = __io_error;
config->error_type = CONFIG_ERR_FILE_IO;
return(CONFIG_FALSE);
}
ret = __config_read(config, stream, filename, NULL);
fclose(stream);
return(ret);
}
/* ------------------------------------------------------------------------- */
int config_write_file(config_t *config, const char *filename)
{
FILE *f = fopen(filename, "wt");
if(! f)
{
config->error_text = __io_error;
config->error_type = CONFIG_ERR_FILE_IO;
return(CONFIG_FALSE);
}
config_write(config, f);
fclose(f);
config->error_type = CONFIG_ERR_NONE;
return(CONFIG_TRUE);
}
/* ------------------------------------------------------------------------- */
void config_destroy(config_t *config)
{
unsigned int count = config->num_filenames;
const char **f;
__config_setting_destroy(config->root);
for(f = config->filenames; count > 0; ++f, --count)
_delete(*f);
_delete(config->filenames);
_delete(config->include_dir);
memset((void *)config, 0, sizeof(config_t));
}
/* ------------------------------------------------------------------------- */
void config_init(config_t *config)
{
memset((void *)config, 0, sizeof(config_t));
config->root = _new(config_setting_t);
config->root->type = CONFIG_TYPE_GROUP;
config->root->config = config;
config->tab_width = 2;
}
/* ------------------------------------------------------------------------- */
void config_set_auto_convert(config_t *config, int flag)
{
if(flag)
config->flags |= CONFIG_OPTION_AUTOCONVERT;
else
config->flags &= ~CONFIG_OPTION_AUTOCONVERT;
}
/* ------------------------------------------------------------------------- */
int config_get_auto_convert(const config_t *config)
{
return((config->flags & CONFIG_OPTION_AUTOCONVERT) != 0);
}
/* ------------------------------------------------------------------------- */
static config_setting_t *config_setting_create(config_setting_t *parent,
const char *name, int type)
{
config_setting_t *setting;
config_list_t *list;
if((parent->type != CONFIG_TYPE_GROUP)
&& (parent->type != CONFIG_TYPE_ARRAY)
&& (parent->type != CONFIG_TYPE_LIST))
return(NULL);
setting = _new(config_setting_t);
setting->parent = parent;
setting->name = (name == NULL) ? NULL : strdup(name);
setting->type = type;
setting->config = parent->config;
setting->hook = NULL;
setting->line = 0;
list = parent->value.list;
if(! list)
list = parent->value.list = _new(config_list_t);
__config_list_add(list, setting);
return(setting);
}
/* ------------------------------------------------------------------------- */
static int __config_setting_get_int(const config_setting_t *setting,
int *value)
{
switch(setting->type)
{
case CONFIG_TYPE_INT:
*value = setting->value.ival;
return(CONFIG_TRUE);
case CONFIG_TYPE_INT64:
if((setting->value.llval > INT32_MAX)
|| (setting->value.llval < INT32_MIN))
*value = 0;
else
*value = (int)(setting->value.llval);
return(CONFIG_TRUE);
case CONFIG_TYPE_FLOAT:
if((setting->config->flags & CONFIG_OPTION_AUTOCONVERT) != 0)
{
*value = (int)(setting->value.fval);
return(CONFIG_TRUE);
}
else
{ /* fall through */ }
default:
return(CONFIG_FALSE);
}
}
/* ------------------------------------------------------------------------- */
int config_setting_get_int(const config_setting_t *setting)
{
int value = 0;
__config_setting_get_int(setting, &value);
return(value);
}
/* ------------------------------------------------------------------------- */
static int __config_setting_get_int64(const config_setting_t *setting,
long long *value)
{
switch(setting->type)
{
case CONFIG_TYPE_INT64:
*value = setting->value.llval;
return(CONFIG_TRUE);
case CONFIG_TYPE_INT:
*value = (long long)(setting->value.ival);
return(CONFIG_TRUE);
case CONFIG_TYPE_FLOAT:
if((setting->config->flags & CONFIG_OPTION_AUTOCONVERT) != 0)
{
*value = (long long)(setting->value.fval);
return(CONFIG_TRUE);
}
else
{ /* fall through */ }
default:
return(CONFIG_FALSE);
}
}
/* ------------------------------------------------------------------------- */
long long config_setting_get_int64(const config_setting_t *setting)
{
long long value = 0;
__config_setting_get_int64(setting, &value);
return(value);
}
/* ------------------------------------------------------------------------- */
int config_setting_lookup_int(const config_setting_t *setting,
const char *name, int *value)
{
config_setting_t *member = config_setting_get_member(setting, name);
if(! member)
return(CONFIG_FALSE);
return(__config_setting_get_int(member, value));
}
/* ------------------------------------------------------------------------- */
int config_setting_lookup_int64(const config_setting_t *setting,
const char *name, long long *value)
{
config_setting_t *member = config_setting_get_member(setting, name);
if(! member)
return(CONFIG_FALSE);
return(__config_setting_get_int64(member, value));
}
/* ------------------------------------------------------------------------- */
static int __config_setting_get_float(const config_setting_t *setting,
double *value)
{
switch(setting->type)
{
case CONFIG_TYPE_FLOAT:
*value = setting->value.fval;
return(CONFIG_TRUE);
case CONFIG_TYPE_INT:
if(config_get_auto_convert(setting->config))
{
*value = (double)(setting->value.ival);
return(CONFIG_TRUE);
}
else
return(CONFIG_FALSE);
case CONFIG_TYPE_INT64:
if(config_get_auto_convert(setting->config))
{
*value = (double)(setting->value.llval);
return(CONFIG_TRUE);
}
else
{ /* fall through */ }
default:
return(CONFIG_FALSE);
}
}
/* ------------------------------------------------------------------------- */
double config_setting_get_float(const config_setting_t *setting)
{
double value = 0.0;
__config_setting_get_float(setting, &value);
return(value);
}
/* ------------------------------------------------------------------------- */
int config_setting_lookup_float(const config_setting_t *setting,
const char *name, double *value)
{
config_setting_t *member = config_setting_get_member(setting, name);
if(! member)
return(CONFIG_FALSE);
return(__config_setting_get_float(member, value));
}
/* ------------------------------------------------------------------------- */
int config_setting_lookup_string(const config_setting_t *setting,
const char *name, const char **value)
{
config_setting_t *member = config_setting_get_member(setting, name);
if(! member)
return(CONFIG_FALSE);
if(config_setting_type(member) != CONFIG_TYPE_STRING)
return(CONFIG_FALSE);
*value = config_setting_get_string(member);
return(CONFIG_TRUE);
}
/* ------------------------------------------------------------------------- */
int config_setting_lookup_bool(const config_setting_t *setting,
const char *name, int *value)
{
config_setting_t *member = config_setting_get_member(setting, name);
if(! member)
return(CONFIG_FALSE);
if(config_setting_type(member) != CONFIG_TYPE_BOOL)
return(CONFIG_FALSE);
*value = config_setting_get_bool(member);
return(CONFIG_TRUE);
}
/* ------------------------------------------------------------------------- */
int config_setting_set_int(config_setting_t *setting, int value)
{
switch(setting->type)
{
case CONFIG_TYPE_NONE:
setting->type = CONFIG_TYPE_INT;
/* fall through */
case CONFIG_TYPE_INT:
setting->value.ival = value;
return(CONFIG_TRUE);
case CONFIG_TYPE_FLOAT:
if(config_get_auto_convert(setting->config))
{
setting->value.fval = (float)value;
return(CONFIG_TRUE);
}
else
return(CONFIG_FALSE);
default:
return(CONFIG_FALSE);
}
}
/* ------------------------------------------------------------------------- */