StrNCat function

Appends a specified number of characters from the beginning of one string to the end of another.

Syntax

PTSTR StrNCat(
  _Inout_ PTSTR  psz1,
          PCTSTR psz2,
          int    cchMax
);

Parameters

psz1 [in, out]

Type: PTSTR

A pointer to a null-terminated string to which the function appends the characters from psz2. It must be large enough to hold the combined strings plus the terminating null character.

psz2

Type: PCTSTR

A pointer to the null-terminated string to be appended.

cchMax

Type: int

The number of characters to be appended to psz1 from the beginning of psz2.

Return value

Type: PTSTR

Returns a pointer to psz1, which holds the combined string.

Remarks

Security Warning:  Using this function incorrectly can compromise the security of your application. The first argument, psz1, must be large enough to hold psz2 and the closing '\0', otherwise a buffer overrun may occur. Buffer overruns may lead to a denial of service attack against the application if an access violation occurs. In the worst case, a buffer overrun may allow an attacker to inject executable code into your process, especially if psz1 is a stack-based buffer. Be aware that the last argument, cchMax, is the number of characters to copy into psz1, not necessarily the size of the psz1 in bytes. Consider using one of the following alternatives. StringCbCat, StringCbCatEx, StringCbCatN, StringCbCatNEx, StringCchCat, StringCchCatEx, StringCchCatN, or StringCchCatNEx. You should review Security Considerations: Microsoft Windows Shell before continuing.

Requirements