libyaml安装说明，请参照

https://github.com/yaml/libyaml 

不过官网的示例，真是不太好找实现的样例，找了大半天，都不知道示例在搞啥，也许我不太深刻吧，果然国外人的思维和中国人不一样。

其次就是解决一个非常简单的事情，读这个配置，把参数取出来就可以了，其余的不要折腾。

直接上代码了。

先搞个db.yaml的文件样子

db_server: "localhost"
db_password: "test"
db_username: "abc"
national_rail_username: test
national_rail_password: wibble
languages:
  - Ruby
  - Perl
  - Python
websites:
  YAML: yaml.org
  Ruby: ruby-lang.org
  Python: python.org
  Perl: use.perl.org

main.c

#include <stdio.h>
#include <yaml.h>

typedef struct Conf {
    char* db_server;
    char* db_pass;
    char* db_user;
    char* rail_user;
    char* rail_pass;
} Conf;

Conf* readConf(char* filename) {
    FILE* fh = fopen(filename, "r");
    yaml_parser_t parser;
    yaml_token_t token;
    Conf* conf = malloc(sizeof(Conf));

    if (!yaml_parser_initialize(&parser))
        fputs("Failed to initialize parser!\n", stderr);
    if (fh == NULL)
        fputs("Failed to open file!\n", stderr);
    yaml_parser_set_input_file(&parser, fh);

    do {
        /* As this is an example, I'll just use:
         *  state = 0 = expect key
         *  state = 1 = expect value
         */
        int state = 0;
        char** datap;
        char* tk;

        yaml_parser_scan(&parser, &token);
        switch(token.type)
        {
            case YAML_KEY_TOKEN:     state = 0; break;
            case YAML_VALUE_TOKEN:   state = 1; break;
            case YAML_SCALAR_TOKEN:
                tk = token.data.scalar.value;
                if (state == 0) {
                    /* It's safe to not use strncmp as one string is a literal */
                    if (!strcmp(tk, "db_server")) {
                        datap = &conf->db_server;
                    } else if (!strcmp(tk, "db_password")) {
                        datap = &conf->db_pass;
                    } else if (!strcmp(tk, "db_username")) {
                        datap = &conf->db_user;
                    } else if (!strcmp(tk, "national_rail_username")) {
                        datap = &conf->rail_user;
                    } else if (!strcmp(tk, "national_rail_password")) {
                        datap = &conf->rail_pass;
                    } else {
                        printf("key: %s\n", tk);
                    }
                } else {
                    *datap = strdup(tk);
                }
                break;
            default: break;
        }
        if (token.type != YAML_STREAM_END_TOKEN)
            yaml_token_delete(&token);
    } while (token.type != YAML_STREAM_END_TOKEN);
    yaml_token_delete(&token);

    yaml_parser_delete(&parser);
    fclose(fh);
    return conf;
}

int main(){

    char *filename = "db.yaml";
    struct Conf *conf = readConf(filename);

    printf("%s,%s\n",conf->db_server,conf->db_user);
    return 0;
}

ok，就这样取出来就可以了。