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Why strcpy_s is safer than strcpy?


Why strcpy_s is safer than strcpy?

By : Jason Baumgardner
Date : September 23 2020, 11:00 PM
seems to work fine Why is strcpy_s() "safer"? Well, it's actually quite involved. (Note that this answer ignores any specific code issues in the posted code.)
First, when MSVC tells you standard functions such as strcpy() are "deprecated", at best Microsoft is being incomplete. At worst, Microsoft is downright lying to you. Ascribe whatever motiviation you want to Microsoft here, but strcpy() and a host of other functions that MSVC calls "deprecated" are standard C functions and they are most certainly NOT deprecated by anyone other than Microsoft. So when MSVC warns you that a function required to be implemented in any conforming C compiler (most of which then flow by requirement into C++...), it omits the "by Microsoft" part.
code :


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Difference between 'strcpy' and 'strcpy_s'?

Difference between 'strcpy' and 'strcpy_s'?


By : Juraj Čiljak
Date : March 29 2020, 07:55 AM
help you fix your problem strcpy is a unsafe funtion. When you try to copy a string using strcpy(), to a buffer which is not large enough to contain it, it will cause a buffer overflow.
strcpy_s() is a security enhanced version of strcpy(). With strcpy_s you can specify the size of the destination buffer to avoid buffer overflows during copies.
code :
char tuna[5];  // a buffer which holds 5 chars incluing the null character.
char salmon[] = "A string which is longer than 5 chars";

strcpy( tuna, salmon ); // This will corrupt your memory because of the buffer overflow.

strcpy_s( tuna, 5, salmon ); // strcpy_s will not write more than 5 chars.
Multiple consecutive strcpy(), display contains bits of every next strcpy()

Multiple consecutive strcpy(), display contains bits of every next strcpy()


By : nutraherlean09
Date : March 29 2020, 07:55 AM
Does that help These 2 lines show what's going wrong:
Following line declares an array of char cP1_Move2_Name initialized with "POUND". The size of this array is exactly 6 bytes, that is the 5 characters from "POUND" plus one for the NUL terminator (strings are terminated by a NUL character, read the chapter dealing with string in your C textbook for more details):
code :
char cP1_Move2_Name[] = "POUND";
strcpy(cP1_Move2_Name,"EARTHQUAKE");
#define MAXSTRINGLENGTH 100
...
char cP1_Pokemon_Name[MAXSTRINGLENGTH] = "POKEMON";
char cP1_Move1_Name[MAXSTRINGLENGTH] = "TACKLE";
char cP1_Move2_Name[MAXSTRINGLENGTH] = "POUND";
...
etc.
How to convert current strcpy to strcpy_s?

How to convert current strcpy to strcpy_s?


By : wassim bellaj
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You really shouldn't do this without inspecting since the point of tightening up buffer management is lost if it's not done intelligently.
Since the nature of the destination buffer (static or heap allocation, for instance) is very important when it comes to the proper arguments for strcpy_s(), and that information of course is not present in the existing strcpy() call, you must add it in any way. This requires a human.
Is strcpy equivalent to strcpy_s

Is strcpy equivalent to strcpy_s


By : Tom Malitz
Date : March 29 2020, 07:55 AM
With these it helps The C11 standard added bounds-checked functions including strcpy_s(). So if you're worried about portability, it's okay as long as you have a C11-compliant compiler. Note that C11-standard "constraint handler" is slightly different than the Microsoft CRT's "invalid parameter handler" so if you're installing a custom handler, it may need some adjustments.
As for replacing it altogether, no, you can't safely replace it with strcpy() for reasons that should be obvious: strcpy() is not bounds-checked. You would either need to do your own bounds checking using strlen(), or use strncpy(), but note that strncpy() behaves differently (specifically, if the source string is too big to fit in the destination, the destination buffer will not be null-terminated).
how can I replace strcpy with strcpy_s?

how can I replace strcpy with strcpy_s?


By : Lunatic Magnet
Date : March 29 2020, 07:55 AM
I hope this helps . strcpy_s ("s" stands for "safe") allows you to specify the size of your destination buffer. std::strcpy doesn't do this, thus allowing you to write past the end of your destination buffer if your source is too long, with bad effects.
In your first case above, try this:
code :
_name = new char[name.length() + 1];
strcpy_s(_name, name.length() + 1, name.c_str());
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