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config.cpp
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config.cpp
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/*
* config.cpp - part of UniClock, a Clock for the Galactic Unicorn.
*
* UniClock is an enhance clock / calendar display for the beautiful Galactic
* Unicorn.
*
* These functions handle the reading/writing of our configuration file, to make
* it easy for the end user to configure their clock.
*
* Copyright (C) 2023 Pete Favelle <[email protected]>
* Released under the MIT License; see LICENSE for details.
*/
/* System headers. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Local headers. */
#include "uniclock.h"
#include "usbfs.hpp"
/* Functions.*/
/*
* read - attempts to read the configuration file; if it doesn't exist, it
* will be created with some reasonable defaults. Returns a time/size
* stamp that can be used to identify when the file is changed.
*/
uint32_t config_read( uc_config_t *p_config )
{
FIL l_fptr;
FILINFO l_fileinfo;
FRESULT l_result;
char l_buffer[128];
uint32_t l_filestamp;
/* Fill in some defaults for the configuration. */
strcpy( p_config->wifi_ssid, "unknown" );
strcpy( p_config->wifi_password, "unknown" );
strcpy( p_config->ntp_server, "pool.ntp.org" );
p_config->utc_offset_minutes = 0;
strcpy( p_config->date_format, "dmy" );
/* Try to open up the file. */
usb_debug( "Reading configuration file %s", UC_CONFIG_FILENAME );
ufs_mount();
l_result = f_open( &l_fptr, UC_CONFIG_FILENAME, FA_READ );
if ( l_result == FR_OK )
{
/* Should be able to scan one line at a time then. */
while ( f_gets( l_buffer, 127, &l_fptr ) != nullptr )
{
/* Clip off any trailing newline. */
if ( l_buffer[strlen(l_buffer)-1] == '\n' )
{
l_buffer[strlen(l_buffer)-1] = '\0';
}
/* Simple match on the start of the line. */
if ( strncmp( l_buffer, "SSID: ", 6 ) == 0 )
{
strncpy( p_config->wifi_ssid, l_buffer+6, UC_SSID_MAXLEN );
p_config->wifi_ssid[UC_SSID_MAXLEN] = '\0';
usb_debug( "Setting SSID to %s", p_config->wifi_ssid );
}
if ( strncmp( l_buffer, "PASSWORD: ", 10 ) == 0 )
{
strncpy( p_config->wifi_password, l_buffer+10, UC_PASSWORD_MAXLEN );
p_config->wifi_password[UC_PASSWORD_MAXLEN] = '\0';
usb_debug( "Setting PASSWORD to %s", p_config->wifi_password );
}
if ( strncmp( l_buffer, "NTP_SERVER: ", 12 ) == 0 )
{
strncpy( p_config->ntp_server, l_buffer+12, UC_NTPSERVER_MAXLEN );
p_config->ntp_server[UC_NTPSERVER_MAXLEN] = '\0';
usb_debug( "Setting NTP_SERVER to %s", p_config->ntp_server );
}
if ( strncmp( l_buffer, "UTC_OFFSET: ", 12 ) == 0 )
{
p_config->utc_offset_minutes = atoi( l_buffer+12 );
usb_debug( "Setting UTC_OFFSET to %d", p_config->utc_offset_minutes );
}
if ( strncmp( l_buffer, "DATE_FORMAT: ", 13 ) == 0 )
{
strncpy( p_config->date_format, l_buffer+13, UC_DATE_FORMAT_MAXLEN );
p_config->date_format[UC_DATE_FORMAT_MAXLEN] = '\0';
usb_debug( "Setting DATE_FORMAT to %s", p_config->date_format );
}
}
/* All done. */
f_close( &l_fptr );
}
else
{
/* Just write the defaults into the file, then. */
if ( !config_write( p_config ) )
{
ufs_unmount();
return 0;
}
}
/* Lastly, stat the file and return the timestamp on it. */
l_result = f_stat( UC_CONFIG_FILENAME, &l_fileinfo );
if ( l_result != FR_OK )
{
ufs_unmount();
return 0;
}
/* Merge fdate and ftime (both 2 bytes long) into a single DWORD. */
l_filestamp = ( l_fileinfo.fdate << 16 ) | l_fileinfo.ftime;
ufs_unmount();
return l_filestamp;
}
/*
* write - saves the provided configuration, overwriting any config that is
* currently there.
*/
bool config_write( const uc_config_t *p_config )
{
FIL l_fptr;
FRESULT l_result;
char l_buffer[128];
/* So, try to open it for writing, creating as required. */
ufs_mount();
l_result = f_open( &l_fptr, UC_CONFIG_FILENAME, FA_CREATE_ALWAYS | FA_WRITE );
if ( l_result != FR_OK )
{
ufs_unmount();
return false;
}
/* And write our values into the file. */
snprintf( l_buffer, 127, "SSID: %s\n", p_config->wifi_ssid );
f_puts( l_buffer, &l_fptr );
snprintf( l_buffer, 127, "PASSWORD: %s\n", p_config->wifi_password );
f_puts( l_buffer, &l_fptr );
snprintf( l_buffer, 127, "NTP_SERVER: %s\n", p_config->ntp_server );
f_puts( l_buffer, &l_fptr );
snprintf( l_buffer, 127, "UTC_OFFSET: %d\n", p_config->utc_offset_minutes );
f_puts( l_buffer, &l_fptr );
snprintf( l_buffer, 127, "DATE_FORMAT: %s\n", p_config->date_format );
f_puts( l_buffer, &l_fptr );
/* Close it up. */
f_close( &l_fptr );
ufs_unmount();
usb_fs_changed();
/* And we're done! */
return true;
}
/*
* changed - quick test to compare the provided timestamp with the current one,
* to determine if the configuration file has been modified.
*/
bool config_changed( uint32_t p_timestamp )
{
FILINFO l_fileinfo;
FRESULT l_result;
uint32_t l_filestamp;
/* Stat the configuration file. */
ufs_mount();
l_result = f_stat( UC_CONFIG_FILENAME, &l_fileinfo );
ufs_unmount();
if ( l_result != FR_OK )
{
return true;
}
/* Merge fdate and ftime (both 2 bytes long) into a single DWORD. */
l_filestamp = ( l_fileinfo.fdate << 16 ) | l_fileinfo.ftime;
if ( p_timestamp == l_filestamp )
{
/* The timestamps match, so the file hasn't changed. */
return false;
}
return true;
}
/* End of file config.cpp */