strncat

Appends not more than maxchar characters from str_ 2 to the end of str_1.

Format 

#include  <string.h>

char *strncat  (char *str_1, const char *str_2,
               size_t maxchar);
Function Variants This function also has variants named _strncat32 and _strncat64 for use with 32-bit and 64-bit pointer sizes, respectively. See Section 1.8 for more information on using pointer-size-specific functions.

Arguments

str_1, str_2
Pointers to null-terminated character strings.
maxchar
The number of characters to concatenate from str_2, unless strncat first encounters a null terminator in str_2. If maxchar is 0, no characters are copied from str_ 2.

Description

A null character is always appended to the result of the strncat function. If strncat reaches the specified maximum, it sets the next byte in str_1 to the null character.

Return Value
x  The address of the first argument, str_1, which is assumed to be large enough to hold the concatenated result. 

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