标准c语言读 windows ini 文件-修改

参考：标准c语言读 windows ini 文件

char* getKeyValu(char *filename, char *section, char *key)
{
  char line[512] = {0};
  char sectname[512] = {0};
  char *skey = NULL, *valu = NULL;
  char seps[] = "=";
  bool flag = false, find = false;
  FILE *fp = fopen(filename, "r");
  assert(fp != NULL);
  if( strchr(section, '[') == NULL){
    strcpy(sectname, "[");
    strcat(sectname, section);
    strcat(sectname, "]");
  } else {
    strcpy(sectname, section);
  }
  while( fgets(line, 512, fp) != NULL ){
    if( strcmp(line, "\n") == 0 ) { // 如果为空行直接跳过
      continue;
    }
    valu = strchr(line, '\n');  // 删除换行符
    if( valu != NULL ){
      *valu = '\0';
    } else {
      do {  // 跳过超过长度的行
        fgets(line, 512, fp);
      }while( strchr(line, '\n') != NULL );
      continue;
    }
    if( line[0] == '#' ){ // 处理以 # 开头注释行
      continue;
    }
    if( line[0] == '[' ){ // 以 [ 开头的行默认为“节”
      if( find == false && strcmp(sectname, line) == 0 ){
        find = true;
        flag = true;
      } else {
        flag = false;
      }
    }
    if( flag ){
      skey = strtok(line, seps);
      if( strcmp(skey, key) == 0 ){
        fclose(fp);
        return strtok(NULL, seps);
      }
    }
  }
  fclose(fp);
  return key;
}