Revision 8682fc568ae5778f0cfc787a8ae3b1251a487839 authored by hudson@twcdns.fastsearch.net on 28 March 2010, 15:40:41 UTC, committed by hudson@twcdns.fastsearch.net on 28 March 2010, 15:40:41 UTC
1 parent 92fed54
config.c
/** \file
* Key/value parser until we have a proper config
*/
/*
* Copyright (C) 2009 Trammell Hudson <hudson+ml@osresearch.net>
*
* 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 2
* 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, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "dryos.h"
#include "config.h"
#include "version.h"
// Don't use isspace since we don't have it
static inline int
is_space( char c )
{
return c == ' ' || c == '\t' || c == '\r' || c == '\n';
}
struct config *
config_parse_line(
const char * line
)
{
int name_len = 0;
int value_len = 0;
struct config * config = malloc( sizeof(*config) );
if( !config )
goto malloc_error;
config->next = 0;
// Trim any leading whitespace
int i = 0;
while( line[i] && is_space( line[i] ) )
i++;
// Copy the name to the name buffer
while( line[i]
&& !is_space( line[i] )
&& line[i] != '='
&& name_len < MAX_NAME_LEN
)
config->name[ name_len++ ] = line[i++];
if( name_len == MAX_NAME_LEN )
goto parse_error;
// And nul terminate it
config->name[ name_len ] = '\0';
// Skip any white space and = signs
while( line[i] && is_space( line[i] ) )
i++;
if( line[i++] != '=' )
goto parse_error;
while( line[i] && is_space( line[i] ) )
i++;
// Copy the value to the value buffer
while( line[i] && value_len < MAX_VALUE_LEN )
config->value[ value_len++ ] = line[ i++ ];
// Back up to trim any white space
while( value_len > 0 && is_space( config->value[ value_len-1 ] ) )
value_len--;
// And nul terminate it
config->value[ value_len ] = '\0';
DebugMsg( DM_MAGIC, 3,
"%s: '%s' => '%s'",
__func__,
config->name,
config->value
);
return config;
parse_error:
DebugMsg( DM_MAGIC, 3,
"%s: PARSE ERROR: len=%d,%d string='%s'",
__func__,
name_len,
value_len,
line
);
free( config );
malloc_error:
return 0;
}
int
read_line(
FILE * file,
char * buf,
size_t size
)
{
size_t len = 0;
while( len < size )
{
int rc = FIO_ReadFile( file, buf+len, 1 );
if( rc <= 0 )
return -1;
if( buf[len] == '\r' )
continue;
if( buf[len] == '\n' )
{
buf[len] = '\0';
return len;
}
len++;
}
return -1;
}
extern struct config_var _config_vars_start[];
extern struct config_var _config_vars_end[];
static void
config_auto_parse(
struct config * config
)
{
struct config_var * var = _config_vars_start;
for( ; var < _config_vars_end ; var++ )
{
if( !streq( var->name, config->name ) )
continue;
DebugMsg( DM_MAGIC, 3,
"%s: '%s' => '%s'",
__func__,
config->name,
config->value
);
if( var->type == 0 )
{
*(unsigned*) var->value = atoi( config->value );
} else {
*(char **) var->value = config->value;
}
return;
}
DebugMsg( DM_MAGIC, 3,
"%s: '%s' unused?",
__func__,
config->name
);
}
int
config_save_file(
struct config * config,
const char * filename
)
{
FILE * file = FIO_CreateFile( filename );
if( file == INVALID_PTR )
return -1;
struct config_var * var = _config_vars_start;
int count = 0;
DebugMsg( DM_MAGIC, 3, "%s: saving to %s", __func__, filename );
fprintf( file,
"# Magic Lantern %s (%s)\n"
"# Build on %s by %s\n",
build_version,
build_id,
build_date,
build_user
);
struct tm now;
LoadCalendarFromRTC( &now );
fprintf( file,
"# Configuration saved on %04d/%02d/%02d %02d:%02d:%02d\n",
now.tm_year + 1900,
now.tm_mon + 1,
now.tm_mday,
now.tm_hour,
now.tm_min,
now.tm_sec
);
for( ; var < _config_vars_end ; var++ )
{
if( var->type == 0 )
fprintf( file,
"%s = %d\n",
var->name,
*(unsigned*) var->value
);
else
fprintf( file,
"%s = %s\n",
var->name,
*(const char**) var->value
);
count++;
}
FIO_CloseFile( file );
return count;
}
struct config *
config_parse(
FILE * file
) {
char line_buf[ MAX_NAME_LEN + MAX_VALUE_LEN ];
struct config * config = 0;
int count = 0;
while( read_line( file, line_buf, sizeof(line_buf) ) >= 0 )
{
// Ignore any line that begins with # or is empty
if( line_buf[0] == '#'
|| line_buf[0] == '\0' )
continue;
struct config * new_config = config_parse_line( line_buf );
if( !new_config )
goto error;
new_config->next = config;
config = new_config;
count++;
config_auto_parse( config );
}
DebugMsg( DM_MAGIC, 3, "%s: Read %d config values", __func__, count );
return config;
error:
DebugMsg( DM_MAGIC, 3, "%s: ERROR Deleting config", __func__ );
while( config )
{
struct config * next = config->next;
DebugMsg( DM_MAGIC, 3, "%s: Deleting '%s' => '%s'",
__func__,
config->name,
config->value
);
free( config );
config = next;
}
return NULL;
}
char *
config_value(
struct config * config,
const char * name
)
{
while( config )
{
if( streq( config->name, name ) )
return config->value;
config = config->next;
}
return NULL;
}
int
config_int(
struct config * config,
const char * name,
int def
)
{
const char * str = config_value( config, name );
if( !str )
{
DebugMsg( DM_MAGIC, 3,
"Config '%s', using default %d",
name,
def
);
return def;
}
def = atoi( str );
DebugMsg( DM_MAGIC, 3,
"Config '%s', using user value %d ('%s')",
name,
def,
str
);
return def;
}
struct config head = { .name = "config.file", .value = "" };
struct config fail = { .name = "config.failure", .value = "1" };
struct config *
config_parse_file(
const char * filename
)
{
FILE * file = FIO_Open( filename, O_SYNC );
strcpy( head.value, filename );
if( file == INVALID_PTR )
{
head.next = &fail;
return &head;
}
struct config * config = config_parse( file );
FIO_CloseFile( file );
head.next = config;
return &head;
}
int
atoi(
const char * s
)
{
int value = 0;
// Only handles base ten for now
while( 1 )
{
char c = *s++;
if( !c || c < '0' || c > '9' )
break;
value = value * 10 + c - '0';
}
return value;
}
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