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



 

NAME


       strcat, strncat - concatenate two strings

 

SYNOPSIS


       #include 

       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 3.05 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)