limine/src/lib/config.c

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#include <stddef.h>
#include <lib/config.h>
#include <lib/libc.h>
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#include <lib/blib.h>
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#include <fs/file.h>
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#define SEPARATOR '\n'
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#define MAX_CONFIG_SIZE 4096
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static char *config_addr;
int init_config(int drive, int part) {
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struct file_handle f;
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if (fopen(&f, drive, part, "/qloader2.cfg")) {
if (fopen(&f, drive, part, "/boot/qloader2.cfg")) {
return -1;
}
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}
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if (f.size >= MAX_CONFIG_SIZE) {
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panic("Config file is too big!\n");
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}
config_addr = balloc(MAX_CONFIG_SIZE);
memset(config_addr, 0, MAX_CONFIG_SIZE);
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fread(&f, config_addr, 0, f.size);
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return 0;
}
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int config_get_entry_name(char *ret, size_t index, size_t limit) {
char *p = config_addr;
for (size_t i = 0; i <= index; i++) {
while (*p != ':') {
if (!*p)
return -1;
p++;
}
p++;
if (*(p - 2) != '\n')
i--;
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}
size_t i;
for (i = 0; i < (limit - 1); i++) {
if (p[i] == SEPARATOR)
break;
ret[i] = p[i];
}
ret[i] = 0;
return 0;
}
int config_set_entry(size_t index) {
char *p = config_addr;
for (size_t i = 0; i <= index; i++) {
while (*p != ':') {
if (!*p)
return -1;
p++;
}
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p++;
if (*(p - 2) != '\n')
i--;
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}
config_addr = p;
cont:
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while (*p != ':' && *p)
p++;
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if (*p && *(p - 1) != '\n')
goto cont;
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*p = 0;
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return 0;
}
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char *config_get_value(char *buf, size_t index, size_t limit, const char *key) {
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if (!limit || !buf || !key)
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return NULL;
size_t key_len = strlen(key);
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for (size_t i = 0; config_addr[i]; i++) {
if (!strncmp(&config_addr[i], key, key_len) && config_addr[i + key_len] == '=') {
if (i && config_addr[i - 1] != SEPARATOR)
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continue;
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if (index--)
continue;
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i += key_len + 1;
size_t j;
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for (j = 0; config_addr[i + j] != SEPARATOR && config_addr[i + j]; j++) {
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if (j == limit - 1)
break;
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buf[j] = config_addr[i + j];
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}
buf[j] = 0;
return buf;
}
}
return NULL;
}