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strcat
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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, overwriting the 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.

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 terminated.

If src contains n or more characters, strcat() 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);
    int 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)


  Copyright 1993 David Metcalfe (david@prism.demon.co.uk)

Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
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Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
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permission notice identical to this one.

Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date.  The author(s) assume no
responsibility for errors or omissions, or for damages resulting from
the use of the information contained herein.  The author(s) may not
have taken the same level of care in the production of this manual,
which is licensed free of charge, as they might when working
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Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.

References consulted:
    Linux libc source code
    Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
    386BSD man pages
Modified Sat Jul 24 18:11:47 1993 by Rik Faith (faith@cs.unc.edu)
2007-06-15, Marc Boyer <marc.boyer@enseeiht.fr> + mtk
    Improve discussion of strncat().
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