File Viewing Utility [by Haddixx]

From: Haddixx <haddixx@megamed.com>
Subject: [Circle] [CODE] File Viewer

The recent post of code snippets that had a function to view the
last 20 lines of the syslog really inspired me.  I created a function
that allows people to view various log files.  Gods can request how
many lines they want look at, etc.  IMHO I think it makes a good code
snippet.

ACMD(do_file)
{
  FILE *req_file;
  int cur_line = 0,
      num_lines = 0,
      req_lines = 0,
      i,
      j;
  int l;
  char field[MAX_INPUT_LENGTH],
       value[MAX_INPUT_LENGTH];

  struct file_struct {
    char *cmd;
    char level;
    char *file;
  } fields[] = {
    { "none",           LVL_IMPL,    "Does Nothing" },
    { "bug",
        LVL_IMPL,    "../lib/misc/bugs"},
    { "typo",

LVL_BUILDER, "../lib/misc/typos"},
    { "ideas",

LVL_IMPL,    "../lib/misc/ideas"},
    { "xnames",

LVL_IMPL,    "../lib/misc/xnames"},
    { "levels",         LVL_MINOR,   "../log/levels" },
    { "rip",            LVL_MINOR,   "../log/rip" },
    { "players",        LVL_MINOR,   "../log/newplayers" },
    { "rentgone",       LVL_MINOR,   "../log/rentgone" },
    { "godcmds",        LVL_IMPL,    "../log/godcmds" },
    { "syslog",         LVL_IMPL,    "../syslog" },
    { "crash",          LVL_IMPL,    "../syslog.CRASH" },
    { "\n", 0, "\n" }
  };

  skip_spaces(&argument);

  if (!*argument)
  {
    strcpy(buf, "USAGE: file <option> <num lines>\r\n\r\nFile options:\r\n");
    for (j = 0, i = 1; fields[i].level; i++)
      if (fields[i].level <= GET_LEVEL(ch))

sprintf(buf, "%s%-15s%s\r\n", buf, fields[i].cmd, fields[i].file);
    send_to_char(buf, ch);
    return;
  }

  strcpy(arg, two_arguments(argument, field, value));

  for (l = 0; *(fields[l].cmd) != '\n'; l++)
    if (!strncmp(field, fields[l].cmd, strlen(field)))
      break;

  if(*(fields[l].cmd) == '\n')
  {
    send_to_char("That is not a valid option!\r\n", ch);
    return;
  }

  if (GET_LEVEL(ch) < fields[l].level)
  {
    send_to_char("You are not godly enough to view that file!\r\n", ch);
    return;
  }

  if(!*value)
     req_lines = 15; /* default is the last 15 lines */
  else
     req_lines = atoi(value);

  /* open the requested file */
  if (!(req_file=fopen(fields[l].file,"r")))
  {
     sprintf(buf2, "SYSERR: Error opening file %s using 'file' command.",
             fields[l].file);
     mudlog(buf2, BRF, LVL_IMPL, TRUE);
     return;
  }

  /* count lines in requested file */
  get_line(req_file,buf);
  while (!feof(req_file))
  {
     num_lines++;
     get_line(req_file,buf);
  }
  fclose(req_file);


  /* Limit # of lines printed to # requested or # of lines in file or
     150 lines */
  if(req_lines > num_lines) req_lines = num_lines;
  if(req_lines > 150) req_lines = 150;


  /* close and re-open */
  if (!(req_file=fopen(fields[l].file,"r")))
  {
     sprintf(buf2, "SYSERR: Error opening file %s using 'file' command.",
             fields[l].file);
     mudlog(buf2, BRF, LVL_IMPL, TRUE);
     return;
  }

  buf2[0] = '\0';

  /* and print the requested lines */
  get_line(req_file,buf);
  while (!feof(req_file))
  {
     cur_line++;
     if(cur_line > (num_lines - req_lines))
     {
        sprintf(buf2,"%s%s\r\n",buf2, buf);
     }
     get_line(req_file,buf);
   }
   page_string(ch->desc, buf2, 1);


   fclose(req_file);
}

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