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# $Header: /home/jcb/MahJong/newmj/RCS/proto-encode-msg.pl,v 12.0 2009/06/28 20:43:13 jcb Rel $
# proto-encode-msg.pl
# generate the protocol conversion switch for c/pmsgs
# Also, generate in cmsg_union.h a definition of a
# massive union type.
# Also, in cmsg_size.c, a function to return the size of a given
# type of cmsg. If the size is -n, that indicates that the
# last field (last sizeof(char*) bytes) is a char *.
#***************** COPYRIGHT STATEMENT **********************
#* This file is Copyright (c) 2000 by J. C. Bradfield. *
#* Distribution and use is governed by the LICENCE file that *
#* accompanies this file. *
#* The moral rights of the author are asserted. *
#* *
#***************** DISCLAIMER OF WARRANTY ********************
#* This code is not warranted fit for any purpose. See the *
#* LICENCE file for further information. *
#* *
#*************************************************************
# debugging
$debug = $ENV{'DEBUG'};
# are we doing cmsg or pmsg ?
if ( $ARGV[0] eq '-cmsg' ) {
$L = 'C' ; $l = 'c';
$msgtype = "Controller";
$infile = "protocol.h";
} elsif ( $ARGV[0] eq '-pmsg' ) {
$L = 'P' ; $l = 'p' ;
$msgtype = "Player";
$infile = "protocol.h";
} elsif ( $ARGV[0] eq '-mcmsg' ) {
$L = 'MC' ; $l = 'mc' ;
$msgtype = "MController";
$infile = "mprotocol.h";
} elsif ( $ARGV[0] eq '-mpmsg' ) {
$L = 'MP' ; $l = 'mp' ;
$msgtype = "MPlayer";
$infile = "mprotocol.h";
} else {
die("No function argument");
}
open(IN,"<$infile") or die("No infile");
open(STDOUT,">enc_${l}msg.c");
open(UNION,">${l}msg_union.h");
open(SIZE,">${l}msg_size.c");
print UNION
"typedef union _${L}MsgUnion {
/* Note that this type field relies on the fact that all
messages have type as their first field */\n";
print UNION $msgtype, "MsgType type;\n";
print SIZE
"static int ${l}msg_size[] = {\n";
while ( ! eof(IN) ) {
while ( <IN> ) {
# unfortunately, we need to catch the enum values
if ( /^\s*${L}Msg(\S+)\s*=\s*(\d+)/ ) {
$enums[$2] = $1;
}
next if ! /struct _${L}Msg/;
chop;
s/^.*${L}Msg//; s/Msg\s*\{// ;
s,\s*/\*.*$,, ; # strip comment
$type = $_ ;
if ( ! $type ) { # reached the dummy type
$doneall = 1;
last;
}
print " case ${L}Msg$type: \n";
print " { ${L}Msg${type}Msg *m UNUSED = (${L}Msg${type}Msg *) msg;\n";
$format = "$type";
# special hack for the Comment message
if ( $type eq 'Comment' ) { $format = "#"; }
$args = '';
$dofinish = 1;
$_ = <IN> ; # skip type
while ( <IN> ) {
chop;
if ( s/^\s*int\s+// ) {
$format .= " %d";
s/;.*//;
$args .= ", m->$_";
} elsif ( s/^\s*bool\s+// ) {
$format .= " %d";
s/;.*//;
print " badfield = 0;\n";
print " if ( m->$_ < 0 || m->$_ > 1 ) { warn(\"bad boolean in message, assuming TRUE\"); badfield = 1 ; };\n";
$args .= ", (badfield ? 1 : m->$_)";
} elsif ( s/^\s*char \*// ) {
s/;.*//;
# if the argument happens to start with a space or backslash, then
# we need to escape it with a backslash
$format .= " %s%s";
# if the argument is null, don't pass it to printf,
# but pass the empty string instead
$args .= ",(m->$_ && (m->$_\[0] == ' ' || m->$_\[0] == '\\\\')) ? \"\\\\\" : \"\", m->$_ ? m->$_ : \"\" ";
# and flag this type:
$charstar{$type} = $_; # see below ...
} elsif ( s/^\s*word\d+\s+// ) {
$format .= " %s";
s/;.*//;
$args .= ", m->$_ ";
} elsif ( s/^\s*TileWind\s+// ) {
$format .= " %c";
s/;.*//;
$args .= ", windletter(m->$_)";
} elsif ( s/^\s*PlayerOption\s+// ) {
$format .= " %s";
s/;.*//;
$args .= ", player_print_PlayerOption(m->$_)";
} elsif ( s/^\s*Tile\s+// ) {
$format .= " %s";
s/;.*//;
$args .= ", tile_code(m->$_)";
} elsif ( s/^\s*ChowPosition\s+// ) {
$format .= " %s";
s/;.*//;
$args .= ", cpos_string(m->$_)";
} elsif ( s/^\s*GameOptionEntry\s+// ) {
$format .= " %s";
s/;.*//;
$args .= ", protocol_print_GameOptionEntry(&m->$_)";
} elsif ( /^\}/ ) { last ; }
else { print STDERR "hope this is a comment: $_\n" if $debug; }
}
next if ! $dofinish;
$format .= '\r\n';
print " while (1) {\n";
print " int size = snprintf(buf,buf_size,\"$format\"$args);\n";
print " if ((size >= 0)&&(size < (int)buf_size))\n";
print " break;\n";
print " buf_size = (size >= 0)?((size_t)size+1):(buf_size > 0)?(buf_size*2):1024;\n";
print " buf = realloc(buf, buf_size);\n";
print " if (!buf) {\n";
print " perror(\"encode_" . $l . "msg\");\n";
print " exit(-1);\n";
print " }\n";
print " }\n";
print " }\n";
print " break;\n";
}
last if $doneall;
}
for ( $i = 0; $i <= $#enums; $i++ ) {
$t = $enums[$i];
if ( $t ) {
$s = $t;
$s =~ tr/A-Z/a-z/;
print UNION "${L}Msg${t}Msg $s;\n";
}
if ( defined($charstar{$t}) ) { $neg = '-' ; } else { $neg = '' ; }
print SIZE +($t ? "${neg}sizeof(${L}Msg${t}Msg)" : 0), ",\n";
}
print UNION "} ${L}MsgUnion;\n";
print SIZE
"};
int ${l}msg_size_of(",$msgtype,"MsgType t) { return ${l}msg_size[t]; }\n\n";
# While we're at it, we'll also generate functions to do
# a deep copy (malloc'ing all space), and to deep free
# the structures.
print SIZE
"${L}MsgMsg *${l}msg_deepcopy(${L}MsgMsg *m) {
${L}MsgMsg *n;
int size;
char *mc,*nc;
size = ${l}msg_size_of(m->type);
if ( size < 0 ) size *= -1;
n = (${L}MsgMsg *)malloc(size);
if ( ! n ) return n;
memcpy((void *)n,(const void *)m,size);
switch ( m->type ) {
";
foreach $k ( keys %charstar ) {
$c = $charstar{$k};
print SIZE
" case ${L}Msg$k:
mc = ((${L}Msg${k}Msg *)m)->$c;
if ( mc ) {
nc = (char *)malloc(strlen(mc)+1);
if ( ! nc ) return NULL;
strcpy(nc,mc);
} else {
nc = NULL;
}
((${L}Msg${k}Msg *)n)->$c = nc;
break;
";
}
print SIZE
" default:
;
}
return n;
}\n\n";
print SIZE
"void ${l}msg_deepfree(${L}MsgMsg *m) {
switch ( m->type ) {
";
foreach $k ( keys %charstar ) {
$c = $charstar{$k};
print SIZE
" case ${L}Msg$k:
if ( ((${L}Msg${k}Msg *)m)->$c )
free((void *)((${L}Msg${k}Msg *)m)->$c);
break;
";
}
print SIZE
" default:
;
}
free((void *)m);
}\n\n";
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