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STRCAT(3)		   Linux Programmer's Manual		     STRCAT(3)

NAME
       strcat, strncat - concatenate two strings

SYNOPSIS
       #include <string.h>

       char *strcat(char *dest, const char *src);

       char *strncat(char *dest, const char *src, size_t n);

DESCRIPTION
       The  strcat() function appends the src string to the dest string, over‐
       writing the null byte ('\0') at the end of dest, and then adds a termi‐
       nating  null  byte.   The  strings may not overlap, and the dest string
       must have enough space for the result.

       The strncat() function is similar, except that

       *  it will use at most n characters from src; and

       *  src does not need to be null terminated if it	 contains  n  or  more
	  characters.

       As  with	 strcat(),  the resulting string in dest is always null termi‐
       nated.

       If src contains n or more characters, strncat() writes  n+1  characters
       to  dest	 (n  from src plus the terminating null byte).	Therefore, the
       size of dest must be at least strlen(dest)+n+1.

       A simple implementation of strncat() might be:

	   char*
	   strncat(char *dest, const char *src, size_t n)
	   {
	       size_t dest_len = strlen(dest);
	       size_t i;

	       for (i = 0 ; i < n && src[i] != '\0' ; i++)
		   dest[dest_len + i] = src[i];
	       dest[dest_len + i] = '\0';

	       return dest;
	   }

RETURN VALUE
       The strcat() and strncat() functions return a pointer to the  resulting
       string dest.

CONFORMING TO
       SVr4, 4.3BSD, C89, C99.

SEE ALSO
       bcopy(3),  memccpy(3),  memcpy(3),  strcpy(3),  strncpy(3),  wcscat(3),
       wcsncat(3)

COLOPHON
       This page is part of release 3.22 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU				  2008-06-13			     STRCAT(3)
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