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#ifndef INI_H
#define INI_H
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#define MAX_LINE_SIZE 256
#define MAX_VALUE_SIZE 128
typedef struct {
char* key;
char* value;
} pair;
typedef struct {
FILE* file;
} ini_parser;
/* loads the file at the given path into memory */
static bool load_ini_file(ini_parser* p, const char* path) {
p->file = fopen(path, "r");
if (p->file == NULL)
return false;
return true;
}
/* unload file */
void unload_ini_file(ini_parser* p) {
fclose(p->file);
}
static bool parse_line(char* line, pair* c) {
int32_t equal_index = strchr(line, '=')-line;
if (equal_index < 0) return false;
size_t len = strlen(line);
c->key = (char*)malloc(equal_index);
c->value = (char*)malloc(len - equal_index);
uint32_t key_start = 0; uint32_t value_start = 0;
bool start_value = false; bool start_key = false;
uint32_t prev_space = 0;
for (uint32_t i = 0; i < len; i++) {
if (i < (uint32_t)equal_index) {
if (line[i] == ' ' && !prev_space) {
prev_space = key_start;
} else if (line[i] != ' ') {
start_key = true;
prev_space = 0;
}
if (start_key)
c->key[key_start++] = line[i];
} else if (i > (uint32_t)equal_index) {
if (line[i] != ' ')
start_value = true;
if (start_value)
c->value[value_start++] = line[i];
}
}
if (prev_space) key_start = prev_space;
c->key[key_start] = '\0';
c->value[value_start] = '\0';
return true;
}
/* return value of matching pair with the given key and section */
char* get_ini_value(ini_parser* p, const char* sec, const char* key) {
rewind(p->file); // reset file
char* value = (char*)malloc(MAX_VALUE_SIZE);
char* current_section = "root";
bool wait_till_next_section = true;
char* line = (char*)malloc(MAX_LINE_SIZE);
while (fgets(line, MAX_LINE_SIZE, p->file) != NULL) {
size_t len = strcspn(line, "\r\n");
line[len] = '\0';
if (len < 3) continue;
char front = *line; // first character for the line
if (front == ';' || front == '#') continue;
else if (front == '[') {
line++;
current_section = (char*)malloc(len + 1);
strncpy(current_section, line, len);
current_section[len-2] = '\0';
wait_till_next_section = false;
continue;
}
if (wait_till_next_section) continue;
if (strcmp(current_section, sec) == 0) {
pair p;
if (!parse_line(line, &p))
continue;
if (strcmp(p.key, key) == 0) {
strcpy(value, p.value);
free(p.key); free(p.value);
free(current_section);
return value;
}
} else wait_till_next_section = true;
}
free(current_section);
return NULL;
}
#endif /* INI_H */
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