strcat


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 terminating null byte ('\0') at the end of dest,  and  then
       adds  a  terminating  null  byte.  The strings may not overlap, and the
       dest string must have enough space for the  result.   If  dest  is  not
       large  enough, program behavior is unpredictable; buffer overruns are a
       favorite avenue for attacking secure programs.

       The strncat() function is similar, except that

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

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

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

       If src contains n or more bytes, strncat() writes n+1 bytes 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.

NOTES
       Some  systems  (the  BSDs,  Solaris,  and others) provide the following
       ments before the call, or test the function return value.  strlcat() is
       not present in glibc and is not standardized by POSIX, but is available
       on Linux via the libbsd library.

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

COLOPHON
       This  page  is  part of release 3.54 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                               2012-07-19                         STRCAT(3)
Man Pages Copyright Respective Owners. Site Copyright (C) 1994 - 2018 Hurricane Electric. All Rights Reserved.