Add explanation of common usage

[p5sagit/p5-mst-13.2.git] / perly.fixer

#!/bin/sh

# Fix up yacc output to allow dynamic allocation.  Since perly.c
# is now provided with the perl source, this should not be necessary.
#  
# However, if the user wishes to use byacc, or wishes to try another 
# compiler compiler (e.g. bison or yacc), this script will get run.
#
# Currently, only byacc version 1.8 is supported.
#
#  Hacks to make it work with Interactive's SysVr3 Version 2.2
#   doughera@lafvax.lafayette.edu (Andy Dougherty)   3/23/91
#
# Additional information to make the BSD section work with SunOS 4.0.2
#   tdinger@East.Sun.COM (Tom Dinger)	4/15/1991

input=$1
output=$2
tmp=/tmp/f$$

if grep 'yaccpar 1.8 (Berkeley)' $input >/dev/null 2>&1; then
    cp $input $output
    if test -f perly.c.diff; then
	patch -F3 $output <perly.c.diff
	rm -rf $input
    fi
    exit
elif grep 'yaccpar	1.9 (Berkeley)' $input >/dev/null 2>&1; then
    if test -f perly.c.dif9; then
	patch -F3 $output <perly.c.dif9
	rm -rf $input
	exit 0
    else
	echo "Diffs from byacc-1.9 are not available."
	echo "If you wish to proceed anyway, do"
	echo "cp $input $output"
	echo "cp y.tab.h perly.h"
	echo "and re-run make. Otherwise, I will use the old perly.c"
	touch perly.c
	# Exit with error status to stop make.
	exit 1
    fi
fi

plan="unknown"

# Below, we check for various yaccpar outputs.

#  Test for BSD 4.3 version.
#  Also tests for the SunOS 4.0.2 version
egrep 'YYSTYPE[ 	]*yyv\[ *YYMAXDEPTH *\];
short[  ]*yys\[ *YYMAXDEPTH *\] *;
yyps *= *&yys\[ *-1 *\];
yypv *= *&yyv\[ *-1 *\];
if *\( *\+\+yyps *>=* *&yys\[ *YYMAXDEPTH *\] *\)' $input >$tmp 2>/dev/null

set `wc -l $tmp`
if test "$1" = "5"; then
      plan="bsd43"
fi

if test "$plan" = "unknown"; then
    #   Test for ISC 2.2 version (probably generic SysVr3).
egrep 'YYSTYPE[ 	]*yyv\[ *YYMAXDEPTH *\];
int[    ]*yys\[ *YYMAXDEPTH *\] *;
yyps *= *&yys\[ *-1 *\];
yypv *= *&yyv\[ *-1 *\];
if *\( *\+\+yy_ps *>= *&yys\[ *YYMAXDEPTH *\] *\)' $input >$tmp 2>/dev/null

    set `wc -l $tmp`
    if test "$1" = "5"; then
	plan="isc"
    fi
fi

case "$plan" in
    ##################################################################
    # The SunOS 4.0.2 version has the comparison fixed already.
    # Also added are out of memory checks (makes porting the generated
    # code easier) For most systems, it can't hurt. -- TD
    "bsd43")
	echo "Patching perly.c to allow dynamic yacc stack allocation"
	echo "Assuming bsd4.3 yaccpar"
	cat >$tmp <<'END'
/YYSTYPE[ 	]*yyv\[ *YYMAXDEPTH *\];/c\
int yymaxdepth = YYMAXDEPTH;\
YYSTYPE *yyv; /* where the values are stored */\
short *yys;\
short *maxyyps;

/short[ 	]*yys\[ *YYMAXDEPTH *\] *;/d

/yyps *= *&yys\[ *-1 *\];/d

/yypv *= *&yyv\[ *-1 *\];/c\
\	if (!yyv) {\
\	    yyv = (YYSTYPE*) safemalloc(yymaxdepth * sizeof(YYSTYPE));\
\	    yys = (short*) safemalloc(yymaxdepth * sizeof(short));\
\	    if ( !yyv || !yys ) {\
\		yyerror( "out of memory" );\
\		return(1);\
\	    }\
\	    maxyyps = &yys[yymaxdepth];\
\	}\
\	yyps = &yys[-1];\
\	yypv = &yyv[-1];


/if *( *\+\+yyps *>=* *&yys\[ *YYMAXDEPTH *\] *)/c\
\		if( ++yyps >= maxyyps ) {\
\		    int tv = yypv - yyv;\
\		    int ts = yyps - yys;\
\
\		    yymaxdepth *= 2;\
\		    yyv = (YYSTYPE*)realloc((char*)yyv,\
\		      yymaxdepth*sizeof(YYSTYPE));\
\		    yys = (short*)realloc((char*)yys,\
\		      yymaxdepth*sizeof(short));\
\		    if ( !yyv || !yys ) {\
\			yyerror( "yacc stack overflow" );\
\			return(1);\
\		    }\
\		    yyps = yys + ts;\
\		    yypv = yyv + tv;\
\		    maxyyps = &yys[yymaxdepth];\
\		}

/yacc stack overflow.*}/d
/yacc stack overflow/,/}/d
END
	sed -f $tmp <$input >$output ;;

    #######################################################
    "isc") # Interactive Systems 2.2  version
	echo "Patching perly.c to allow dynamic yacc stack allocation"
	echo "Assuming Interactive SysVr3 2.2 yaccpar"
	# Easier to simply put whole script here than to modify the
	# bsd script with sed.
	# Main changes:  yaccpar sometimes uses yy_ps and yy_pv
	# which are local register variables.
	#  if(++yyps > YYMAXDEPTH) had opening brace on next line.
	# I've kept that brace in along with a call to yyerror if
	# realloc fails. (Actually, I just don't know how to do
	# multi-line matches in sed.)
	cat > $tmp << 'END'
/YYSTYPE[ 	]*yyv\[ *YYMAXDEPTH *\];/c\
int yymaxdepth = YYMAXDEPTH;\
YYSTYPE *yyv; /* where the values are stored */\
int *yys;\
int *maxyyps;

/int[ 	]*yys\[ *YYMAXDEPTH *\] *;/d

/yyps *= *&yys\[ *-1 *\];/d

/yypv *= *&yyv\[ *-1 *\];/c\
\	if (!yyv) {\
\	    yyv = (YYSTYPE*) safemalloc(yymaxdepth * sizeof(YYSTYPE));\
\	    yys = (int*) safemalloc(yymaxdepth * sizeof(int));\
\	    maxyyps = &yys[yymaxdepth];\
\	}\
\	yyps = &yys[-1];\
\	yypv = &yyv[-1];

/if *( *\+\+yy_ps *>= *&yys\[ *YYMAXDEPTH *\] *)/c\
\		if( ++yy_ps >= maxyyps ) {\
\		    int tv = yy_pv - yyv;\
\		    int ts = yy_ps - yys;\
\
\		    yymaxdepth *= 2;\
\		    yyv = (YYSTYPE*)realloc((char*)yyv,\
\		      yymaxdepth*sizeof(YYSTYPE));\
\		    yys = (int*)realloc((char*)yys,\
\		      yymaxdepth*sizeof(int));\
\		    yy_ps = yyps = yys + ts;\
\		    yy_pv = yypv = yyv + tv;\
\		    maxyyps = &yys[yymaxdepth];\
\		}\
\		if (yyv == NULL || yys == NULL)
END
	sed -f $tmp < $input > $output ;;

    ######################################################
    # Plan still unknown
    *) sed -e 's/Received token/ *** Received token/' $input >$output;
esac

rm -rf $tmp $input