C 中的 snprintf 与 strcpy(等) [英] snprintf vs. strcpy (etc.) in C

问题描述

为了进行字符串连接，我一直在做 char* 缓冲区的基本 strcpy、strncpy.然后我了解了 snprintf 和朋友.

For doing string concatenation, I've been doing basic strcpy, strncpy of char* buffers. Then I learned about the snprintf and friends.

我是否应该坚持使用 strcpy、strcpy + \0 终止?或者我将来应该只使用 snprintf 吗?

Should I stick with my strcpy, strcpy + \0 termination? Or should I just use snprintf in the future?

推荐答案

在大多数情况下，我怀疑使用 strncpy 和 snprintf 是可衡量的.

For most purposes I doubt the difference between using strncpy and snprintf is measurable.

如果涉及任何格式，我倾向于只使用 snprintf 而不是混合在 strncpy 中.

If there's any formatting involved I tend to stick to only snprintf rather than mixing in strncpy as well.

我发现这有助于代码清晰，这意味着您可以使用以下习语来跟踪您在缓冲区中的位置(从而避免创建 Shlemiel the Painter 算法):

I find this helps code clarity, and means you can use the following idiom to keep track of where you are in the buffer (thus avoiding creating a Shlemiel the Painter algorithm):

char sBuffer[iBufferSize];
char* pCursor = sBuffer;

pCursor += snprintf(pCursor, sizeof(sBuffer) - (pCursor - sBuffer),  "some stuff\n");

for(int i = 0; i < 10; i++)
{
   pCursor += snprintf(pCursor, sizeof(sBuffer) - (pCursor - sBuffer),  " iter %d\n", i);
}

pCursor += snprintf(pCursor, sizeof(sBuffer) - (pCursor - sBuffer),  "into a string\n");

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