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STRCAT
Section: Linux Programmer's Manual (3)
Updated: 2010-09-20
Index
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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 (aq\0aq) 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,
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] != aq\0aq ; i++)
dest[dest_len + i] = src[i];
dest[dest_len + i] = aq\0aq;
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),
string(3),
strncpy(3),
wcscat(3),
wcsncat(3)
COLOPHON
This page is part of release 3.27 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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