1STRCAT(3)                  Linux Programmer's Manual                 STRCAT(3)
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NAME

6       strcat, strncat - concatenate two strings
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SYNOPSIS

9       #include <string.h>
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11       char *strcat(char *dest, const char *src);
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13       char *strncat(char *dest, const char *src, size_t n);
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DESCRIPTION

16       The  strcat() function appends the src string to the dest string, over‐
17       writing the null byte ('\0') at the end of dest, and then adds a termi‐
18       nating  null  byte.   The  strings may not overlap, and the dest string
19       must have enough space for the result.
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21       The strncat() function is similar, except that
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23       *  it will use at most n characters from src; and
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25       *  src does not need to be null-terminated if it  contains  n  or  more
26          characters.
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28       As  with  strcat(),  the resulting string in dest is always null-termi‐
29       nated.
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31       If src contains n or more characters, strncat() writes  n+1  characters
32       to  dest  (n  from src plus the terminating null byte).  Therefore, the
33       size of dest must be at least strlen(dest)+n+1.
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35       A simple implementation of strncat() might be:
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37           char*
38           strncat(char *dest, const char *src, size_t n)
39           {
40               size_t dest_len = strlen(dest);
41               size_t i;
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43               for (i = 0 ; i < n && src[i] != '\0' ; i++)
44                   dest[dest_len + i] = src[i];
45               dest[dest_len + i] = '\0';
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47               return dest;
48           }
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RETURN VALUE

51       The strcat() and strncat() functions return a pointer to the  resulting
52       string dest.
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CONFORMING TO

55       SVr4, 4.3BSD, C89, C99.
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SEE ALSO

58       bcopy(3),  memccpy(3),  memcpy(3),  strcpy(3),  strncpy(3),  wcscat(3),
59       wcsncat(3)
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COLOPHON

62       This page is part of release 3.25 of the Linux  man-pages  project.   A
63       description  of  the project, and information about reporting bugs, can
64       be found at http://www.kernel.org/doc/man-pages/.
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68GNU                               2008-06-13                         STRCAT(3)