Avoid bashisms in arithmetic expansion

1 files changed, 7 insertions, 7 deletions

diff --git a/src/makecolumns.sh b/src/makecolumns.sh
index 1d3fcd1..ab61c29 100755
--- a/src/makecolumns.sh
+++ b/src/makecolumns.sh
@@ -50,12 +50,12 @@ do_decompress_old() {
     printf "done.\n"
 
     printf "Decompressing $2 chunks ... "
-    number_of_files=`find . -name \*.lha | wc -l`
+    numfiles=`find . -name \*.lha | wc -l`
     reported=0; processed=0
     for archive in *.lha; do
         lha x ${archive} > /dev/null
         rm ${archive}
-        [ 1 -eq $(( ( processed++ * 20 ) / number_of_files > reported )) ] && printf "%d%% " $(( ++reported * 5 ))
+        [ 1 -eq $(( ( (processed+=1) * 20 ) / numfiles > reported )) ] && printf "%d%% " $(( (reported+=1) * 5 ))
     done
     [ $reported -lt 10 ] && printf "100% "
     printf "done.\n"
@@ -144,7 +144,7 @@ handle_old_format() {
         vname_file=`printf "%s + 3\n" ${vname_file} | bc`
         vname_file=`printf %0${filename_len}d ${vname_file}`
         table_file=`printf "%s + 3\n" ${table_file} | bc`
-        [ 1 -eq $(( ( table_file * 20 ) / number_of_files > reported )) ] && printf "%d%% " $(( ++reported * 5 ))
+        [ 1 -eq $(( ( table_file * 20 ) / number_of_files > reported )) ] && printf "%d%% " $(( (reported+=1) * 5 ))
         table_file=`printf %0${filename_len}d ${table_file}`
     done
     printf "done.\n"
@@ -206,11 +206,11 @@ handle_new_format() {
     # Do enumerations with builtin shell tools. Unfortunally neither
     # jot nor seq are standards
     printf "Splitting decompressed chunks into their columns (11 total) ... 1, "
-    f=0; while [ $f -lt $rows ]; do printf "file_%05X " $(( f++ * 11)); done | xargs cat | xxd -ps -c1 > column_0
+    f=-1; while [ $f -lt $rows ]; do printf "file_%05X " $(( (f+=1) * 11)); done | xargs cat | xxd -ps -c1 > column_0
 
-    for column in 1 2 3 4 5 6 7 8 9 10; do
-      printf "%d, " $(( column + 1 ))
-      f=0; while [ $f -lt $rows ]; do printf "file_%05X " $(( column + f++ * 11 )); done | xargs cat | tr '\n\0' '\t\n' > column_${column}
+    for col in 1 2 3 4 5 6 7 8 9 10; do
+      printf "%d, " $(( col + 1 ))
+      f=-1; while [ $f -lt $rows ]; do printf "file_%05X " $(( col + (f+=1) * 11 )); done | xargs cat | tr '\n\0' '\t\n' > column_${col}
     done
     printf "done.\n"