什么是C库函数生成随机字符串？ [英] What's the C library function to generate random string?

问题描述

有没有以同样的方式， mkstemp（）创建一个唯一的文件名创建一个随机字符串的库函数？这是什么？

Is there a library function that creates a random string in the same way that mkstemp() creates a unique file name? What is it?

推荐答案

有没有标准的功​​能，但你的操作系统可能实现的东西。你有没有考虑通过手册搜索？另外，这个任务是很简单的。我会尝试使用类似：

There's no standard function, but your OS might implement something. Have you considered searching through the manuals? Alternatively, this task is simple enough. I'd be tempted to use something like:

void rand_str(char *dest, size_t length) {
    char charset[] = "0123456789"
                     "abcdefghijklmnopqrstuvwxyz"
                     "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    while (length-- > 0) {
        size_t index = (double) rand() / RAND_MAX * (sizeof charset - 1);
        *dest++ = charset[index];
    }
    *dest = '\0';
}

这对EBCDIC系统的正常工作，并能适应几乎任何字符集的整齐的利益。我还没有添加任何下列字符到字符集，因为它似乎很清楚，你想要的字符串，可以是文件名：

This has the neat benefit of working correctly on EBCDIC systems, and being able to accommodate virtually any character set. I haven't added any of the following characters into the character set, because it seems clear that you want strings that could be filenames:

":;?@[\]^_`{|}"

我想通很多这些人物能够在各种操作系统的文件名是无效的。

I figured many of those characters could be invalid in filenames on various OSes.

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