strcat(3)
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, 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 3.25 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/.