What memcpy_s return error 404 mean [closed]

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memcpy_s() is formally defined in the C11 standard (ISO/IEC 9899:2011), section K.3.7.1.1, which simply states:

The memcpy_s function returns zero if there was no runtime-constraint violation. Otherwise, a nonzero value is returned.

There is no mention of the specific values that memcpy_s() return on error, so they are implementation-defined.

You did not say which compiler you are actually using.

For example, Microsoft’s memcpy_s() documentation for MSVC states that memcpy_s() can only return either EINVAL or ERANGE when an error occurs, and that behavior is undefined if the source and destination overlap.

MinGW-w64 exhibits this same behavior.

However, this behavior is formally forbidden by the memcpy_s() definition in ISO/IEC 9899:2011:

Copying shall not take place between objects that overlap.

In some runtime implementations, there is another error code that may be returned:

#define ESOVRLP         ( 404 )       /* overlap undefined           */

This error means the source and destination are overlapping.

Since you are getting a return value that is undocumented by Microsoft for behavior that is undefined in MSVC (and MinGW), it stands to reason that you are probably using some other compiler/runtime that has a more C11-compliant implementation that is returning ESOVRLP if overlap is detected (for example, safeclib does).

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