#include <sys/stat.h>
#include <unistd.h>

#include "buffer.h"
#include "byte.h"
#include "getln.h"
#include "logmsg.h"
#include "open.h"
#include "stralloc.h"

#define WHO "setmaillist"

int rename(const char *, const char *);  // stdio.h

void usage()
{
  logmsg(WHO, 100, USAGE, "setmaillist list.bin list.tmp");
}

stralloc line = {0};
int match;

char *fnbin;
char *fntmp;
int fd;
char buf[1024];
buffer bo;

void writeerr()
{
  logmsg(WHO, 111, FATAL, B("unable to write to: ", fntmp));
}

static void out(char *s, int len)
{
  if (buffer_put(&bo, s, len) == -1) writeerr();
}

int main(int argc, char **argv)
{
  umask(033);

  fnbin = argv[1];
  if (!fnbin) usage();
  fntmp = argv[2];
  if (!fntmp) usage();

  fd = open_trunc(fntmp);
  if (fd == -1) logmsg(WHO, 111, FATAL, B("unable to create: ", fntmp));

  buffer_init(&bo, write, fd, buf, sizeof(buf));


  do {
    if (getln(buffer_0small, &line, &match, '\n') == -1)
      logmsg(WHO, 111, FATAL, "unable to read input: ");

    while (line.len) {
      if (line.s[line.len - 1] != '\n')
        if (line.s[line.len - 1] != ' ')
          if (line.s[line.len - 1] != '\t') break;
      --line.len;
    }

    if (byte_chr(line.s, line.len, '\0') != line.len) logmsg(WHO, 111, FATAL, "NUL in input");

    if (line.len)
      if (line.s[0] != '#') {
        if ((line.s[0] == '.') || (line.s[0] == '/')) {
          out(line.s, line.len);
          out("", 1);
        } else {
          if (line.len > 800) logmsg(WHO, 111, FATAL, "addresses must be under 800 bytes");
          if (line.s[0] != '&') out("&", 1);
          out(line.s, line.len);
          out("", 1);
        }
      }

  } while (match);

  if (buffer_flush(&bo) == -1) writeerr();
  if (fsync(fd) == -1) writeerr();
  if (close(fd) == -1) writeerr(); /* NFS stupidity */

  if (rename(fntmp, fnbin) == -1) logmsg(WHO, 111, FATAL, B("unable to move ", fntmp, " to: ", fnbin));

  _exit(0);
}