faux/lub/string/string_catn.c

/*
 * string_cat.c
 */
#include "private.h"

#include <string.h>
#include <stdlib.h>
/*--------------------------------------------------------- */
void
lub_string_catn(char      **string,
                const char *text,
                size_t      len)
{
    if(text)
    {
        char   *q;
        size_t  length,initlen,textlen = strlen(text);

        /* make sure the client cannot give us duff details */
        len = (len < textlen) ? len : textlen;
        
        /* remember the size of the original string */
        initlen = *string ? strlen(*string) : 0;

    
        /* account for '\0' */
        length = initlen + len + 1;

        /* allocate the memory for the result */
        q = realloc(*string,length);
        if(NULL != q)
        {
            *string = q;
            /* move to the end of the initial string */
            q += initlen;

            while(len--)
            {
                *q++ = *text++;
            }
            *q = '\0';
        }
    }
}
/*--------------------------------------------------------- */