ftg strcatall

strcatall.c

/* append num strings, returning heap-allocated string.
   caller must free() returned ptr. */
char *
ftg_strcatall(size_t num, ...)
{
    size_t i, alloc_size = 0;
    va_list va1, va2;
    char *buf, *p_buf;

    va_start(va1, num);
    for (i = 0; i < num; i++)
    {
        alloc_size += strlen(va_arg(va1, char*));
    }
    va_end(va1);
    alloc_size += 1;

    buf = p_buf = (char*)ftg_malloc(sizeof(char)*alloc_size);
    if (!buf) return NULL;
    va_start(va2, num);
    for (i = 0; i < num; i++)
    {
        char *s = va_arg(va2, char*);
        while (*s)
        {
            *p_buf = *s;
            p_buf++, s++;
        }
    }
    va_end(va2);

    buf[alloc_size-1] = '\0';
    return buf;
}