text: /* ISC license. */
  
  #include <skalibs/bytestr.h>
  #include <skalibs/sgetopt.h>
  #include <skalibs/buffer.h>
  #include <skalibs/strerr2.h>
  #include <skalibs/djbunix.h>
  #include <skalibs/uint.h>
  #include <skalibs/netstring.h>
  
  #define USAGE "dollarat [ -n ] [ -0 | -d delimchar ]"
  
  int main (int argc, char const *const *argv, char const *const *envp)
  {
    unsigned int n, i = 0 ;
    char const *x ;
    char delim = '\n' ;
    int zero = 0 ;
    int nl = 1 ;
    PROG = "dollarat" ;
    {
      subgetopt_t l = SUBGETOPT_ZERO ;
      for (;;)
      {
        register int opt = subgetopt_r(argc, argv, "nd:0", &l) ;
        if (opt == -1) break ;
        switch (opt)
        {
          case 'n' : nl = 0 ; break ;
          case 'd' : delim = *l.arg ; break ;
          case '0' : zero = 1 ; break ;
          default : strerr_dieusage(100, USAGE) ;
        }
      }
      argc -= l.ind ; argv += l.ind ;
    }
    if (zero) delim = 0 ;
    x = env_get2(envp, "#") ;
    if (!x) strerr_dienotset(100, "#") ;
    if (!uint0_scan(x, &n)) strerr_dieinvalid(100, "#") ;
    for (; i < n ; i++)
    {
      char fmt[UINT_FMT] ;
      fmt[uint_fmt(fmt, i+1)] = 0 ;
      x = env_get2(envp, fmt) ;
      if (!x) strerr_dienotset(100, fmt) ;
      if (delim || zero)
      {
        if ((buffer_puts(buffer_1, x) < 0)
         || (((i < n-1) || nl) && (buffer_put(buffer_1, &delim, 1) < 0)))
          strerr_diefu1sys(111, "write to stdout") ;
      }
      else
      {
        unsigned int written = 0 ;
        if (!netstring_put(buffer_1, x, str_len(x), &written))
          strerr_diefu1sys(111, "write a netstring to stdout") ;
      }
    }
    if (!buffer_flush(buffer_1))
      strerr_diefu1sys(111, "write to stdout") ;
    return 0 ;
  }
  