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Many C code freeing pointers calls:
if (p)
free(p);
But why? I thought C standard say the free function doesn’t do anything given a NULL pointer. So why another explicit check?
The construct:
has always been OK in C, back to the original UNIX compiler written by Dennis Ritchie. Pre-standardisation, some poor compilers might not have fielded it correctly, but these days any compiler that does not cannot legitimately call itself a compiler for the C language. Using it typically leads to clearer, more maintainable code.