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    Command:

    strcpy

    
    
    

    SYNOPSIS

           #include <string.h>
    
           char *strcpy(char *dest, const char *src);
    
           char *strncpy(char *dest, const char *src, size_t n);
    
    
    

    DESCRIPTION

           The  strcpy()  function  copies the string pointed to by src, including
           the terminating null byte ('\0'), to the buffer  pointed  to  by  dest.
           The  strings  may  not overlap, and the destination string dest must be
           large enough to receive the copy.  Beware  of  buffer  overruns!   (See
           BUGS.)
    
           The  strncpy()  function is similar, except that at most n bytes of src
           are copied.  Warning: If there is no null byte among the first n  bytes
           of src, the string placed in dest will not be null-terminated.
    
           If  the  length of src is less than n, strncpy() writes additional null
           bytes to dest to ensure that a total of n bytes are written.
    
           A simple implementation of strncpy() might be:
    
               char *
               strncpy(char *dest, const char *src, size_t n)
               {
                   size_t i;
    
                   for (i = 0; i < n && src[i] != '\0'; i++)
                       dest[i] = src[i];
                   for ( ; i < n; i++)
                       dest[i] = '\0';
    
                   return dest;
               }
    
    
    

    RETURN VALUE

           The strcpy() and strncpy() functions return a pointer to  the  destina-
           tion string dest.
    
    
    

    ATTRIBUTES

       Multithreading (see pthreads(7))
           The strcpy() and strncpy() functions are thread-safe.
    
    
    

    CONFORMING TO

           SVr4, 4.3BSD, C89, C99.
    
    
    

    NOTES

           Some  programmers consider strncpy() to be inefficient and error prone.
           If the programmer knows (i.e., includes code to test!)  that  the  size
           of dest is greater than the length of src, then strcpy() can be used.
    
    
           (Of course, the above technique ignores the fact that, if src  contains
           more  than  buflen - 1  bytes,  information  is  lost in the copying to
           dest.)
    
           Some systems (the BSDs, Solaris,  and  others)  provide  the  following
           function:
    
               size_t strlcpy(char *dest, const char *src, size_t size);
    
           This  function  is  similar  to strncpy(), but it copies at most size-1
           bytes to dest, always adds a terminating null byte, and  does  not  pad
           the  target with (further) null bytes.  This function fixes some of the
           problems of strcpy() and strncpy(), but the caller  must  still  handle
           the possibility of data loss if size is too small.  The return value of
           the function is the length of src, which allows truncation to be easily
           detected: if the return value is greater than or equal to size, trunca-
           tion occurred.  If loss of data matters, the caller must  either  check
           the  arguments  before  the  call,  or  test the function return value.
           strlcpy() is not present in glibc and is not standardized by POSIX, but
           is available on Linux via the libbsd library.
    
    
    

    BUGS

           If  the destination string of a strcpy() is not large enough, then any-
           thing might happen.   Overflowing  fixed-length  string  buffers  is  a
           favorite  cracker technique for taking complete control of the machine.
           Any time a program reads or copies data  into  a  buffer,  the  program
           first  needs  to check that there's enough space.  This may be unneces-
           sary if you can show that overflow is impossible, but be careful:  pro-
           grams  can  get changed over time, in ways that may make the impossible
           possible.
    
    
    

    SEE ALSO

           bcopy(3), memccpy(3),  memcpy(3),  memmove(3),  stpcpy(3),  stpncpy(3),
           strdup(3), string(3), wcscpy(3), wcsncpy(3)
    
    
    

    GNU 2014-03-04 STRCPY(3)

    
    
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