so straight downloaded and compiled

remcon@RonniesPC:~/swfotefuss/src$ make
make -s swr
  Compiling o/imc.o....
  Compiling o/11.o....
  Compiling o/act_comm.o....
  Compiling o/act_info.o....
act_info.c: In function ‘void do_who(CHAR_DATA*, const char*)’:
act_info.c:2503:60: warning: ‘%s’ directive output may be truncated writing up to 1023 bytes into a region of size between 2 and 4094 [-Wformat-truncation=]
 2503 |       snprintf( buf, MAX_STRING_LENGTH+2, "%s   %s%s%s%s %s%s\n%s",
      |                                                            ^~
......
 2507 |                char_name, wch->pcdata->title, extra_title, clan_name, ch ? "\r" : "" );
      |                                                            ~~~~~~~~~
act_info.c:2503:15: note: ‘snprintf’ output 6 or more bytes (assuming 5121) into a destination of size 4098
 2503 |       snprintf( buf, MAX_STRING_LENGTH+2, "%s   %s%s%s%s %s%s\n%s",
      |       ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 2504 |                race,
      |                ~~~~~
 2505 |                invis_str,
      |                ~~~~~~~~~~
 2506 |                IS_SET( wch->act, PLR_AFK ) ? "[AFK]" : "",
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 2507 |                char_name, wch->pcdata->title, extra_title, clan_name, ch ? "\r" : "" );
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Compiling o/act_move.o....
  Compiling o/act_obj.o....
  Compiling o/act_wiz.o....
  Compiling o/boards.o....
  Compiling o/bounty.o....
  Compiling o/build.o....
  Compiling o/clans.o....
  Compiling o/color.o....
  Compiling o/comm.o....
  Compiling o/comments.o....
  Compiling o/const.o....
  Compiling o/db.o....
  Compiling o/dns.o....
  Compiling o/editor.o....
  Compiling o/fight.o....
  Compiling o/finfo.o....
  Compiling o/force.o....
  Compiling o/fskills.o....
  Compiling o/functions.o....
  Compiling o/handler.o....
  Compiling o/hashstr.o....
  Compiling o/hotboot.o....
  Compiling o/hunter.o....
  Compiling o/interp.o....
  Compiling o/magic.o....
  Compiling o/makeobjs.o....
  Compiling o/marriage.o....
  Compiling o/mccp.o....
  Compiling o/misc.o....
  Compiling o/mssp.o....
  Compiling o/mud_comm.o....
  Compiling o/mud_prog.o....
  Compiling o/newarena.o....
newarena.c: In function ‘void show_jack_pot()’:
newarena.c:485:12: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf1’ [-Wrestrict]
  485 |    snprintf( buf1 + strlen( buf1 ), ( MAX_INPUT_LENGTH - strlen( buf1 ) ), "%sThe jack pot for this arena is %d credits\r\n", buf1, arena_pot );
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:482:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  482 |    char buf1[MAX_INPUT_LENGTH];
      |         ^~~~
newarena.c:486:12: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf1’ [-Wrestrict]
  486 |    snprintf( buf1 + strlen( buf1 ), ( MAX_INPUT_LENGTH - strlen( buf1 ) ), "%s%d credits have been bet on this arena.\r\r\n\n", buf1, bet_pot );
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:482:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  482 |    char buf1[MAX_INPUT_LENGTH];
      |         ^~~~
newarena.c: In function ‘void do_awho(CHAR_DATA*, const char*)’:
newarena.c:595:12: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf’ [-Wrestrict]
  595 |    snprintf( buf + strlen( buf ), ( MAX_INPUT_LENGTH - strlen( buf ) ), "%s-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-", buf );
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:584:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  584 |    char buf[MAX_INPUT_LENGTH];
      |         ^~~
newarena.c:596:12: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf’ [-Wrestrict]
  596 |    snprintf( buf + strlen( buf ), ( MAX_INPUT_LENGTH - strlen( buf ) ), "%s&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-\r\n", buf );
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:584:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  584 |    char buf[MAX_INPUT_LENGTH];
      |         ^~~
newarena.c:597:12: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf’ [-Wrestrict]
  597 |    snprintf( buf + strlen( buf ), ( MAX_INPUT_LENGTH - strlen( buf ) ), "%sGame Length = &R%-3d   &WTime To Start &R%-3d\r\n", buf, game_length, time_to_start );
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:584:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  584 |    char buf[MAX_INPUT_LENGTH];
      |         ^~~
newarena.c:598:12: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf’ [-Wrestrict]
  598 |    snprintf( buf + strlen( buf ), ( MAX_INPUT_LENGTH - strlen( buf ) ), "%s&Wtop_level Limits &R%d &Wto &R%d\r\n", buf, lo_lim, hi_lim );
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:584:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  584 |    char buf[MAX_INPUT_LENGTH];
      |         ^~~
newarena.c:599:12: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf’ [-Wrestrict]
  599 |    snprintf( buf + strlen( buf ), ( MAX_INPUT_LENGTH - strlen( buf ) ), "%s         &WJackpot = &R%d\r\n", buf, arena_pot );
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:584:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  584 |    char buf[MAX_INPUT_LENGTH];
      |         ^~~
newarena.c:600:12: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf’ [-Wrestrict]
  600 |    snprintf( buf + strlen( buf ), ( MAX_INPUT_LENGTH - strlen( buf ) ), "%s&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B", buf );
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:584:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  584 |    char buf[MAX_INPUT_LENGTH];
      |         ^~~
newarena.c:601:12: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf’ [-Wrestrict]
  601 |    snprintf( buf + strlen( buf ), ( MAX_INPUT_LENGTH - strlen( buf ) ), "%s-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B-&W-&B\r\n", buf );
      |    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:584:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  584 |    char buf[MAX_INPUT_LENGTH];
      |         ^~~
newarena.c: In function ‘void start_arena()’:
newarena.c:320:21: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf1’ [-Wrestrict]
  320 |             snprintf( buf1 + strlen( buf1 ), ( MAX_INPUT_LENGTH - strlen( buf1 ) ), "%s1 &Whour to start\r\n", buf1 );
      |             ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:291:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  291 |    char buf1[MAX_INPUT_LENGTH];
      |         ^~~~
newarena.c:321:21: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf1’ [-Wrestrict]
  321 |             snprintf( buf1 + strlen( buf1 ), ( MAX_INPUT_LENGTH - strlen( buf1 ) ), "%s\r\nType &Rarena &Wto enter.\r\n", buf1 );
      |             ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:291:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  291 |    char buf1[MAX_INPUT_LENGTH];
      |         ^~~~
newarena.c:310:21: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf1’ [-Wrestrict]
  310 |             snprintf( buf1 + strlen( buf1 ), ( MAX_INPUT_LENGTH - strlen( buf1 ) ), "%s%d &Whours to start\r\n", buf1, time_to_start );
      |             ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:291:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  291 |    char buf1[MAX_INPUT_LENGTH];
      |         ^~~~
newarena.c:311:21: warning: ‘snprintf’ argument 4 may overlap destination object ‘buf1’ [-Wrestrict]
  311 |             snprintf( buf1 + strlen( buf1 ), ( MAX_INPUT_LENGTH - strlen( buf1 ) ), "%s\r\nType &Rarena &Wto enter.\r\n", buf1 );
      |             ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
newarena.c:291:9: note: destination object referenced by ‘restrict’-qualified argument 1 was declared here
  291 |    char buf1[MAX_INPUT_LENGTH];
      |         ^~~~
  Compiling o/pfiles.o....
  Compiling o/planets.o....
  Compiling o/player.o....
  Compiling o/reset.o....
  Compiling o/save.o....
  Compiling o/sha256.o....
  Compiling o/ships.o....
  Compiling o/shops.o....
  Compiling o/skills.o....
  Compiling o/slicers.o....
  Compiling o/space.o....
  Compiling o/special.o....
  Compiling o/swskills.o....
  Compiling o/tables.o....
  Compiling o/track.o....
  Compiling o/tech.o....
  Compiling o/update.o....
-e Generating dependency file ...
-e Done compiling mud.
make -s dns
-e Done compiling DNS resolver.

Yep. I ignored all of that because I didn't know how to fix it and those statements have all been working fine.

its because they are putting the string into itself, just remove the %s and the buf its adding since its already doing that when it does the buf1 + strlen( buf1 ), ( MAX_INPUT_LENGTH - strlen( buf1 ) ). its about like its double copying it the way it is looking anyways lol. could also just use mudstrlcat for the strings its copying.

for example i changed

         if( time_to_start > 1 )
         {
            snprintf( buf1, MAX_INPUT_LENGTH, "&WThe Killing Fields are open to top_levels &R%d &Wthru &R%d\r\n", lo_lim, hi_lim );
            snprintf( buf1 + strlen( buf1 ), ( MAX_INPUT_LENGTH - strlen( buf1 ) ), "%s%d &Whours to start\r\n", buf1, time_to_start );
            snprintf( buf1 + strlen( buf1 ), ( MAX_INPUT_LENGTH - strlen( buf1 ) ), "%s\r\nType &Rarena &Wto enter.\r\n", buf1 );
            snprintf( buf, MAX_INPUT_LENGTH, "With just %d hours to go till the start of the arena %d people have accepted the challenge!\r\n",
                     time_to_start, num_in_arena(  ) );
            sportschan( buf );
            sportschan( buf1 );
         }
         else
         {
            snprintf( buf1, MAX_INPUT_LENGTH, "&WThe Killing Fields are open to top_levels &R%d &Wthru &R%d\r\n", lo_lim, hi_lim );
            snprintf( buf1 + strlen( buf1 ), ( MAX_INPUT_LENGTH - strlen( buf1 ) ), "%s1 &Whour to start\r\n", buf1 );
            snprintf( buf1 + strlen( buf1 ), ( MAX_INPUT_LENGTH - strlen( buf1 ) ), "%s\r\nType &Rarena &Wto enter.\r\n", buf1 );
            snprintf( buf, MAX_INPUT_LENGTH, "With just 1 hour to go till the start of the arena %d people have accepted the challenge!\r\n",
                     num_in_arena(  ) );
            sportschan( buf );
            sportschan( buf1 );
         }
         snprintf( buf, MAX_INPUT_LENGTH, "&WThe arena has been opened. &R%d &Whour(s) to start.\r\n", time_to_start );
         sportschan( buf );

to this

         if( time_to_start > 1 )
         {
            snprintf( buf1, sizeof( buf1 ), "&WThe Killing Fields are open to top_levels &R%d &Wthru &R%d\r\n", lo_lim, hi_lim );
            snprintf( buf1 + strlen( buf1 ), ( sizeof( buf1 ) - strlen( buf1 ) ), "%d &Whours to start\r\n", time_to_start );
            snprintf( buf1 + strlen( buf1 ), ( sizeof( buf1 ) - strlen( buf1 ) ), "%s", "\r\nType &Rarena &Wto enter.\r\n" );
            snprintf( buf, sizeof( buf ), "With just %d hours to go till the start of the arena %d people have accepted the challenge!\r\n",
                     time_to_start, num_in_arena(  ) );
            sportschan( buf );
            sportschan( buf1 );
         }
         else
         {
            snprintf( buf1, sizeof( buf1 ), "&WThe Killing Fields are open to top_levels &R%d &Wthru &R%d\r\n", lo_lim, hi_lim );
            snprintf( buf1 + strlen( buf1 ), ( sizeof( buf1 ) - strlen( buf1 ) ), "%s", "1 &Whour to start\r\n" );
            snprintf( buf1 + strlen( buf1 ), ( sizeof( buf1 ) - strlen( buf1 ) ), "%s", "\r\nType &Rarena &Wto enter.\r\n" );
            snprintf( buf, sizeof( buf ), "With just 1 hour to go till the start of the arena %d people have accepted the challenge!\r\n",
                     num_in_arena(  ) );
            sportschan( buf );
            sportschan( buf1 );
         }