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// MIT License, Copyright (c) 2021 Marvin Borner
#include <config.h>
#include <device.h>
#include <library.h>
#include <log.h>
#include <panic.h>
#include <protocols/all.h>
// Keys
#define TIMEOUT "TIMEOUT"
#define PATH "PATH"
// Config structure
static struct cfg cfg = { 0 };
// Config file contents (if found)
static char file[1024] = { 0 };
// Find config file
static u8 config_find(struct dev *dev)
{
if (!dev->p.disk.fs.read)
return 0; // No fs found or not readable - continue!
s32 res = dev->p.disk.fs.read("/boot/segelboot.cfg", file, 0, sizeof(file), dev);
if (res > 0)
return 1; // Break foreach
// Continue foreach
return 0;
}
// Checks if index is appropriate as some key/value need to be in entry
static void config_in_entry(u8 index)
{
if (index == 0xff)
panic("No entry name given\n");
}
// Add/overwrite value by key and entry index
static void config_add(u8 index, enum config_key key, const char *value)
{
struct config_entry *entry = &cfg.entry[index];
entry->exists = 1;
switch (key) {
case CONFIG_NAME:
config_in_entry(index);
strlcpy(entry->name, value, sizeof(entry->name));
break;
case CONFIG_TIMEOUT:
cfg.timeout = atoi(value);
break;
case CONFIG_PATH:
config_in_entry(index);
strlcpy(entry->full_path, value, sizeof(entry->full_path));
break;
case CONFIG_NONE:
default:
panic("Invalid config\n");
}
}
// TODO: This code is kind of messy
// Structure per line: KEY=VALUE
static void config_parse(void)
{
// Entry index
u8 entry = 0xff;
// Value per key
char value[64] = { 0 };
u8 value_index = 0;
// States
enum config_key current = CONFIG_NONE; // Value key type
u8 state = 0; // 0 is key, 1 is value, 2 is entry
const char *start = file; // Start is at the beginning of the key
for (const char *p = start; *p; p++) {
if (state == 0) {
// We're at key parsing
if (*p == '\n') { // A key can't just end but ok
start = p + 1;
} else if (*p == '#') {
state = 2; // Let's parse the entry name
p++;
continue;
} else if (*p != '=') {
continue;
}
// The key is now at start until p
u8 diff = p - start;
// Timeout key
if (diff == sizeof(TIMEOUT) - 1 && memcmp(start, TIMEOUT, diff) == 0) {
current = CONFIG_TIMEOUT;
state = 1;
continue;
}
// Path key
if (diff == sizeof(PATH) - 1 && memcmp(start, PATH, diff) == 0) {
current = CONFIG_PATH;
state = 1;
continue;
}
} else if (state == 1) {
// We're at value parsing
assert(value_index + 1 < (u8)sizeof(value));
if (*p == '\n') { // Finished
value[value_index] = 0;
config_add(entry, current, value);
value_index = 0;
state = 0;
p--; // Repeat parse normally
} else {
value[value_index++] = *p;
}
} else if (state == 2) {
// We're at entry name parsing
assert(value_index + 1 < (u8)sizeof(value));
if (*p == '\n') { // Finished
entry = entry == 0xff ? 0 : entry + 1;
value[value_index] = 0;
config_add(entry, CONFIG_NAME, value);
value_index = 0;
state = 0;
p--; // Repeat parse normally
} else {
value[value_index++] = *p;
}
}
}
}
// Extract the disk from path by returning index of delimiter or 0xff
// Example: disk:/boot/config.cfg returns 4 (:)
static u8 config_path_disk(const char *path)
{
for (const char *p = path; *p; p++)
if (*p == ':')
return p - path;
return 0xff;
}
// Find matching disk dev for every entry and verify path existence and readability
static void config_verify(void)
{
for (u8 i = 0; i < COUNT(cfg.entry) && cfg.entry[i].exists; i++) {
struct config_entry *entry = &cfg.entry[i];
u8 len = config_path_disk(entry->full_path);
struct dev *dev = device_get_by_name(entry->full_path, len);
if (!dev || dev->type != DEVICE_DISK)
panic("Invalid device in config\n");
entry->dev = dev;
if (!dev->p.disk.fs.read)
panic("Device fs not readable\n");
// This is now the correct path (due to "disk:PATH")
const char *path = &entry->full_path[len + 1];
entry->path = path;
u8 buf[1] = { 0 }; // Just for existence-check
s32 ret = dev->p.disk.fs.read(path, buf, 0, sizeof(buf), dev);
if (ret != 1 || !buf[0])
panic("Path is invalid\n");
if (!impl_detect(entry))
panic("No boot implementation found\n");
}
}
// Call cb for each entry config
void config_foreach(u8 (*cb)(struct config_entry *))
{
for (u8 i = 0; i < COUNT(cfg.entry) && cfg.entry[i].exists; i++) {
if (cb(&cfg.entry[i])) // 1 means break
break;
}
}
// Print all configs and entry values
static void config_print(void)
{
log("[CFG] Global: %d\n", cfg.timeout);
for (u8 i = 0; i < COUNT(cfg.entry) && cfg.entry[i].exists; i++)
log("[CFG] Entry: %s at %s\n", cfg.entry[i].name, cfg.entry[i].full_path);
}
// Execute entry implementation
void config_exec(struct config_entry *entry)
{
impl_exec(entry);
}
void config_read(void)
{
device_foreach(DEVICE_DISK, &config_find);
if (!file[0])
panic("No config found\n");
config_parse();
config_verify();
config_print();
}
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