linux c 配置文件解析

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

int validate_ini_file(const char *filename) {
    FILE *file = fopen(filename, "r");
    if (!file) return 0;

    char line[256];
    while (fgets(line, sizeof(line), file)) {
        // 简单的格式检查
        if (strchr(line, '=') == NULL && strchr(line, '[') == NULL) {
            fclose(file);
            return 0;
        }
    }
    fclose(file);
    return 1;
}

void parse_config(const char *filename) {
    FILE *file = fopen(filename, "r");
    if (!file) {
        perror("Failed to open config file");
        return;
    }

    char line[256];
    int db_host_set = 0;
    while (fgets(line, sizeof(line), file)) {
        // 解析每一行
        if (strncmp(line, "db_host=", 8) == 0) {
            db_host_set = 1;
            // 处理 db_host
        }
        // 其他配置项...
    }
    fclose(file);

    if (!db_host_set) {
        fprintf(stderr, "Error: db_host is not set in the config file.\n");
        // 设置默认值或退出程序
    }
}

#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>

void parse_config_mmap(const char *filename) {
    int fd = open(filename, O_RDONLY);
    if (fd == -1) {
        perror("Failed to open config file");
        return;
    }

    struct stat sb;
    if (fstat(fd, &sb) == -1) {
        perror("Failed to get file size");
        close(fd);
        return;
    }

    char *addr = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
    if (addr == MAP_FAILED) {
        perror("Failed to mmap file");
        close(fd);
        return;
    }

    // 解析内存映射的数据
    // ...

    if (munmap(addr, sb.st_size) == -1) {
        perror("Failed to unmap file");
    }
    close(fd);
}