patcheck: Allow overiding grep program(s) through environment variables.

patcheck hardcodes the binary names for grep/egrep. This makes overriding the
binary names a pain, e.g. when calling a GNU version of grep on BSD systems.

Signed-off-by: Diego Biurrun <diego@biurrun.de>

tools/patcheck

@@ -8,9 +8,11 @@ if [ $# = 0 ]; then
     exit
 fi
 
+GREP=grep
+EGREP=egrep
 TMP=patcheck.tmp
 OPT="-nH"
-#FILES=`grep '^+++' $* | sed 's/+++ //g'`
+#FILES=`$GREP '^+++' $* | sed 's/+++ //g'`
 
 echo patCHeck 1e10.0
 echo This tool is intended to help a human check/review patches it is very far from
@@ -27,7 +29,7 @@ hiegrep(){
     arg="$1"
     msg="$2"
     shift 2
-    grep $OPT '^+' $* | grep -v ':+++'| egrep --color=always -- "$arg"> $TMP && printf "\n$msg\n"
+    $GREP $OPT '^+' $* | $GREP -v ':+++'| $EGREP --color=always -- "$arg"> $TMP && printf "\n$msg\n"
     cat $TMP
 }
 
@@ -36,7 +38,7 @@ hiegrep2(){
     varg="$2"
     msg="$3"
     shift 3
-    grep $OPT '^+' $* | grep -v ':+++' | egrep -v -- "$varg" | egrep --color=always -- "$arg" > $TMP && printf "\n$msg\n"
+    $GREP $OPT '^+' $* | $GREP -v ':+++' | $EGREP -v -- "$varg" | $EGREP --color=always -- "$arg" > $TMP && printf "\n$msg\n"
     cat $TMP
 }
 
@@ -60,7 +62,7 @@ hiegrep '\+= *1 *;'     'can be simplified to ++' $*
 hiegrep '-= *1 *;'      'can be simplified to --' $*
 hiegrep '((!|=)= *(0|NULL)[^0-9a-z]|[^0-9a-z](0|NULL) *(!|=)=)' 'x==0 / x!=0 can be simplified to !x / x' $*
 
-egrep $OPT '^\+ *(const *|)static' $*| egrep --color=always '[^=]= *(0|NULL)[^0-9a-zA-Z]'> $TMP && printf '\nuseless 0 init\n'
+$EGREP $OPT '^\+ *(const *|)static' $*| $EGREP --color=always '[^=]= *(0|NULL)[^0-9a-zA-Z]'> $TMP && printf '\nuseless 0 init\n'
 cat $TMP
 hiegrep '# *ifdef * (HAVE|CONFIG)_' 'ifdefs that should be #if' $*
 
@@ -89,7 +91,7 @@ hiegrep2 '\.sample_fmts *= *\(' 'const' 'missing const for sample_fmts array' $*
 hiegrep2 '\.supported_framerates *= *\(' 'const' 'missing const for supported_framerates array' $*
 hiegrep2 '\.channel_layouts *= *\(' 'const' 'missing const for channel_layouts array' $*
 
-#egrep $OPT '^\+.*const ' $*| grep -v 'static'> $TMP && printf '\nnon static const\n'
+#$EGREP $OPT '^\+.*const ' $*| $GREP -v 'static'> $TMP && printf '\nnon static const\n'
 #cat $TMP
 
 hiegrep2 "$ERE_TYPES" '(static|av_|ff_|typedef|:\+[^a-zA-Z_])' 'Non static with no ff_/av_ prefix' $*
@@ -104,58 +106,58 @@ hiegrep ':\+  *{ *$' '{ should be on the same line as the related previous state
 
 
 rm $TMP
-for i in `grep -H '^+.*@param' $*| sed 's/^\([^:]*\):.*@param\(\[.*\]\|\) *\([a-zA-Z0-9_]*\) .*$/\1:\3/'` ; do
+for i in `$GREP -H '^+.*@param' $*| sed 's/^\([^:]*\):.*@param\(\[.*\]\|\) *\([a-zA-Z0-9_]*\) .*$/\1:\3/'` ; do
     doxpar=`echo $i | sed 's/^.*:\(.*\)$/\1/'`
     file=`echo $i | sed 's/^\([^:]*\):.*$/\1/'`
-    grep " *$doxpar *[),]" $file | grep -v '@param' >/dev/null || grep --color=always "@param *$doxpar" $file >>$TMP
+    $GREP " *$doxpar *[),]" $file | $GREP -v '@param' >/dev/null || $GREP --color=always "@param *$doxpar" $file >>$TMP
 done
 if test -e $TMP ; then
     printf '\nmismatching doxy params\n'
     cat $TMP
 fi
 
-egrep -B2 $OPT '^(\+|) *('"$ERE_TYPES"'|# *define)' $* | egrep -A2 --color=always '(:|-)\+[^/]*/(\*([^*]|$)|/([^/]|$))' > $TMP && printf "\n Non doxy comments\n"
+$EGREP -B2 $OPT '^(\+|) *('"$ERE_TYPES"'|# *define)' $* | $EGREP -A2 --color=always '(:|-)\+[^/]*/(\*([^*]|$)|/([^/]|$))' > $TMP && printf "\n Non doxy comments\n"
 cat $TMP
 
 rm $TMP
 for i in \
-    `egrep -H '^\+ *'"$ERE_TYPES" $* |\
-    grep -v '(' | egrep -v '\Wgoto\W' |\
+    `$EGREP -H '^\+ *'"$ERE_TYPES" $* |\
+    $GREP -v '(' | $EGREP -v '\Wgoto\W' |\
     xargs -d '\n' -n 1 |\
-    grep -o '[* ][* ]*[a-zA-Z][0-9a-zA-Z_]* *[,;=]' |\
+    $GREP -o '[* ][* ]*[a-zA-Z][0-9a-zA-Z_]* *[,;=]' |\
     sed 's/.[* ]*\([a-zA-Z][0-9a-zA-Z_]*\) *[,;=]/\1/'` \
     ; do
-    echo $i | grep '^NULL$' && continue
-    egrep $i' *(\+|-|\*|/|\||&|%|)=[^=]' $* >/dev/null || echo "possibly never written:"$i >> $TMP
-    egrep '(=|\(|return).*'$i'(==|[^=])*$'    $* >/dev/null || echo "possibly never read   :"$i >> $TMP
-    egrep -o $i' *((\+|-|\*|/|\||&|%|)=[^=]|\+\+|--) *(0x|)[0-9]*(;|)'   $* |\
-           egrep -v $i' *= *(0x|)[0-9]{1,};'>/dev/null || echo "possibly constant     :"$i >> $TMP
+    echo $i | $GREP '^NULL$' && continue
+    $EGREP $i' *(\+|-|\*|/|\||&|%|)=[^=]' $* >/dev/null || echo "possibly never written:"$i >> $TMP
+    $EGREP '(=|\(|return).*'$i'(==|[^=])*$'    $* >/dev/null || echo "possibly never read   :"$i >> $TMP
+    $EGREP -o $i' *((\+|-|\*|/|\||&|%|)=[^=]|\+\+|--) *(0x|)[0-9]*(;|)'   $* |\
+           $EGREP -v $i' *= *(0x|)[0-9]{1,};'>/dev/null || echo "possibly constant     :"$i >> $TMP
 done
 if test -e $TMP ; then
     printf '\npossibly unused variables\n'
     cat $TMP
 fi
 
-grep '^+++ .*Changelog' $* >/dev/null || printf "\nMissing changelog entry (ignore if minor change)\n"
+$GREP '^+++ .*Changelog' $* >/dev/null || printf "\nMissing changelog entry (ignore if minor change)\n"
 
-cat $* | tr '\n' '@' | egrep --color=always -o '(fprintf|av_log|printf)\([^)]*\)[+ ;@]*\1'  >$TMP && printf "\nMergeable calls\n"
+cat $* | tr '\n' '@' | $EGREP --color=always -o '(fprintf|av_log|printf)\([^)]*\)[+ ;@]*\1'  >$TMP && printf "\nMergeable calls\n"
 cat $TMP | tr '@' '\n'
 
-cat $* | tr '\n' '@' | egrep --color=always -o '\+ *if *\( *([A-Za-z0-9_]*) *[<>]=? *[0-9]* *\) * \1 *= *[0-9]* *;[ @\\+]*else *if *\( *\1 *[<>]=? *[0-9]* *\) *\1 *= *[0-9]* *;'  >$TMP && printf "\nav_clip / av_clip_uint8 / av_clip_int16 / ...\n"
+cat $* | tr '\n' '@' | $EGREP --color=always -o '\+ *if *\( *([A-Za-z0-9_]*) *[<>]=? *[0-9]* *\) * \1 *= *[0-9]* *;[ @\\+]*else *if *\( *\1 *[<>]=? *[0-9]* *\) *\1 *= *[0-9]* *;'  >$TMP && printf "\nav_clip / av_clip_uint8 / av_clip_int16 / ...\n"
 cat $TMP | tr '@' '\n'
 
-cat $* | tr '\n' '@' | egrep --color=always -o '\+ *if *\( *([A-Za-z0-9_]*) *[<>]=? *([A-Za-z0-9_]*) *\)[ @\\+]*(\1|\2) *= *(\1|\2) *;'  >$TMP && printf "\nFFMIN/FFMAX\n"
+cat $* | tr '\n' '@' | $EGREP --color=always -o '\+ *if *\( *([A-Za-z0-9_]*) *[<>]=? *([A-Za-z0-9_]*) *\)[ @\\+]*(\1|\2) *= *(\1|\2) *;'  >$TMP && printf "\nFFMIN/FFMAX\n"
 cat $TMP | tr '@' '\n'
 
-cat $* | tr '\n' '@' | egrep --color=always -o '\+ *if *\( *([A-Za-z0-9_]*) *\)[ @\\+]*av_free(p|) *\( *(&|) *\1[^-.]'  >$TMP && printf "\nav_free(NULL) is safe\n"
+cat $* | tr '\n' '@' | $EGREP --color=always -o '\+ *if *\( *([A-Za-z0-9_]*) *\)[ @\\+]*av_free(p|) *\( *(&|) *\1[^-.]'  >$TMP && printf "\nav_free(NULL) is safe\n"
 cat $TMP | tr '@' '\n'
 
-cat $* | tr '\n' '@' | egrep --color=always -o '[^a-zA-Z0-9_]([a-zA-Z0-9_]*) *= *av_malloc *\([^)]*\)[ @;\\+]*memset *\( *\1'  >$TMP && printf "\nav_mallocz()\n"
+cat $* | tr '\n' '@' | $EGREP --color=always -o '[^a-zA-Z0-9_]([a-zA-Z0-9_]*) *= *av_malloc *\([^)]*\)[ @;\\+]*memset *\( *\1'  >$TMP && printf "\nav_mallocz()\n"
 cat $TMP | tr '@' '\n'
 
 
 # doesnt work
-#cat $* | tr '\n' '@' | egrep -o '[^a-zA-Z_0-9]([a-zA-Z][a-zA-Z_0-9]*) *=[^=].*\1' | egrep -o '[^a-zA-Z_0-9]([a-zA-Z][a-zA-Z_0-9]*) *=[^=].*\1 *=[^=]'  >$TMP && printf "\nPossibly written 2x before read\n"
+#cat $* | tr '\n' '@' | $EGREP -o '[^a-zA-Z_0-9]([a-zA-Z][a-zA-Z_0-9]*) *=[^=].*\1' | $EGREP -o '[^a-zA-Z_0-9]([a-zA-Z][a-zA-Z_0-9]*) *=[^=].*\1 *=[^=]'  >$TMP && printf "\nPossibly written 2x before read\n"
 #cat $TMP | tr '@' '\n'
 
 exit
@@ -163,7 +165,7 @@ exit
 TODO/idea list:
 
 for all demuxers & muxers
-    grep for "avctx->priv_data"
+    $EGREP for "avctx->priv_data"
 
 vertical align =
 /* and * align