嵌入式 C 中的源代码，用于将无符号整数转换为字符串 [英] Source code in embedded C for unsigned integer to string

问题描述

Without resorting to standard library utoa, I'm looking for source code of utoa so I may customise it for specific project. I have unsigned integer (32 bits) with output such as 0xFFFF_FFFF

I also looking for source code for unsigned integer and half word to string in binary format.

解决方案

Try this:

char *dec(unsigned x, char *s)
{
    *--s = 0;
    if (!x) *--s = '0';
    for (; x; x/=10) *--s = '0'+x%10;
    return s;
}

You call it with a pointer to the end of a caller-provided buffer, and the function returns the pointer to the beginning of the string. The buffer should have length at least 3*sizeof(int)+1 to be safe.

Of course this is easily adapted to other bases.

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