linux c 简单配置文件

[Database]
host=localhost
port=3306
user=admin
password=secret

[Logging]
level=info
file=/var/log/app.log

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct {
    char *section;
    char *key;
    char *value;
} ConfigEntry;

ConfigEntry* read_ini_file(const char *filename, int *num_entries) {
    FILE *file = fopen(filename, "r");
    if (!file) {
        perror("Failed to open file");
        return NULL;
    }

    ConfigEntry *entries = malloc(100 * sizeof(ConfigEntry));
    *num_entries = 0;

    char line[256];
    char current_section[256] = "";
    while (fgets(line, sizeof(line), file)) {
        // Trim leading and trailing whitespace
        line[strcspn(line, "\r\n")] = 0;
        while (*line == ' ' || *line == '\t') line++;

        if (line[0] == '[' && line[strlen(line) - 1] == ']') {
            strcpy(current_section, line + 1);
            current_section[strlen(current_section) - 1] = '\0';
        } else if (*line != ';' && *line != '#') { // Skip comments
            char *equal = strchr(line, '=');
            if (equal) {
                *equal = '\0';
                entries[*num_entries].section = strdup(current_section);
                entries[*num_entries].key = strdup(line);
                entries[*num_entries].value = strdup(equal + 1);
                (*num_entries)++;
            }
        }
    }

    fclose(file);
    return entries;
}

int main() {
    int num_entries;
    ConfigEntry *entries = read_ini_file("config.ini", &num_entries);

    for (int i = 0; i < num_entries; i++) {
        printf("[%s] %s = %s\n", entries[i].section, entries[i].key, entries[i].value);
        free(entries[i].section);
        free(entries[i].key);
        free(entries[i].value);
    }
    free(entries);

    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void write_ini_file(const char *filename, ConfigEntry *entries, int num_entries) {
    FILE *file = fopen(filename, "w");
    if (!file) {
        perror("Failed to open file");
        return;
    }

    for (int i = 0; i < num_entries; i++) {
        fprintf(file, "[%s]\n%s = %s\n\n", entries[i].section, entries[i].key, entries[i].value);
    }

    fclose(file);
}

int main() {
    ConfigEntry entries[] = {
        {"Database", "host", "localhost"},
        {"Database", "port", "3306"},
        {"Logging", "level", "info"},
        {"Logging", "file", "/var/log/app.log"}
    };
    int num_entries = sizeof(entries) / sizeof(entries[0]);

    write_ini_file("config_new.ini", entries, num_entries);

    return 0;
}