The structure in Listing 4 is used by the mimeokay function for one purpose: to set the global string pointer fstr to the appropriate MIME type string matching the file's extension: fext.
清单4中所示的结构由mimeokay函数使用，用来实现以下用途：将全局字符串指针fstr 设置为与文件扩展名 fext 相匹配的合适的MIME类型。
When a long string variable is assigned a string constant, the string pointer is assigned the address of the memory block generated for the string constant.
当一个串变量被赋予一个串常量时，串指针被赋予串常量内存块的地址。
When a long string variable is assigned a string constant, the string pointer is assigned the address of the memory block generated for the string constant.
当一个串变量被赋予一个串常量时，串指针被赋予串常量内存块的地址。
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