strcat2.c

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#include "config.h"
#include "strcat2.h"

#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>

#include "len.h"

char *strcat2(const char *delim, unsigned int n, ...)
{
        va_list ap;
        char *s, *res = NULL;
        size_t delim_len, s_len, res_len = 0;
        unsigned int j, i;
        if(delim != NULL)
                delim_len = str_len(delim);
        else
                delim_len = 0;
        va_start(ap, n);
        for(j = 0; j < n; j++)
        {
                s = va_arg(ap, char *);
                if(s != NULL)
                {
                        s_len = str_len(s);
                        res = realloc(res, res_len + (j > 0 ? delim_len : 0) + s_len + 1);
                        if(j > 0)
                        {
                                for(i = 0; i < delim_len; i++)
                                        res[res_len + i] = delim[i];
                                res_len += delim_len;
                        }
                        for(i = 0; i < s_len; i++)
                                res[res_len + i] = s[i];
                        res_len += s_len;
                }
        }
        va_end(ap);
        res[res_len] = '\0';
        return res;
}