[FFmpeg-devel] [PATCH] [RFC] tools/patcheck: portability fixes.

[Reimar.Doeffinger at gmx.de]

From: Reimar Döffinger <Reimar.Doeffinger at gmx.de>

Enough to make it run on macOS.
In particular:
- fix "empty subexpression" errors caused by constructs like (smth|),
  use ? instead to make them optional
- no -d option for xargs, use the more standard -0 and use tr to
  replace newlines with 0.

Not sure if these cause issues somewhere else, not even completely
sure they all work, but quick testing suggests they work.
On the other hand I remember issues with '?' where I resorted to {0,1}
instead, but I do not remember details.
Ignore if fixing these seems not worth the risk.
---
 tools/patcheck | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/tools/patcheck b/tools/patcheck
index fe52938f29..ee993c60fc 100755
--- a/tools/patcheck
+++ b/tools/patcheck
@@ -21,7 +21,7 @@ echo may or may not be bad. When you use it and it misses something or detects
 echo something wrong, fix it and send a patch to the ffmpeg-devel mailing list.
 echo License: GPL, Author: Michael Niedermayer
 
-ERE_PRITYP='(unsigned *|)(char|short|long|int|long *int|short *int|void|float|double|(u|)int(8|16|32|64)_t)'
+ERE_PRITYP='(unsigned *)?(char|short|long|int|long *int|short *int|void|float|double|u?int(8|16|32|64)_t)'
 ERE_TYPES='(const|static|av_cold|inline| *)*('$ERE_PRITYP'|[a-zA-Z][a-zA-Z0-9_]*)[* ]{1,}[a-zA-Z][a-zA-Z0-9_]*'
 ERE_FUNCS="$ERE_TYPES"' *\('
 
@@ -63,7 +63,7 @@ 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' $*
 
@@ -77,7 +77,7 @@ hiegrep ':\+ *'"$ERE_PRITYP"' *inline' 'non static inline or strangely ordered i
 hiegrep "$ERE_FUNCS"' *\)' 'missing void' $*
 hiegrep '(sprintf|strcat|strcpy)' 'Possible security issue, make sure this is safe or use snprintf/av_strl*' $*
 hiegrep '/ *(2|4|8|16|32|64|128|256|512|1024|2048|4096|8192|16384|32768|65536)[^0-9]' 'divide by 2^x could use >> maybe' $*
-hiegrep '#(el|)if *(0|1)' 'useless #if' $*
+hiegrep '#(el)?if *(0|1)' 'useless #if' $*
 hiegrep 'if *\( *(0|1) *\)' 'useless if()' $*
 hiegrep '& *[a-zA-Z0-9_]* *\[ *0 *\]' 'useless & [0]' $*
 hiegrep '(\( *[0-9] *(&&|\|\|)|(&&|\|\|) *[0-9] *\))' 'overriding condition' $*
@@ -118,22 +118,22 @@ if test -e $TMP ; then
     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' |\
-    xargs -d '\n' -n 1 |\
+    tr '\n' '\0' | xargs -0 -n 1 |\
     $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 $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
+    $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'
@@ -151,7 +151,7 @@ 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 $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_freep? *\( *&? *\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"
-- 
2.37.1 (Apple Git-137.1)