Sunday, June 10, 2007

Turn pseudo-enums expressed as #defines into strings.

I have an include file that has 50+ #defines with constants (0,1,2,3,...,etc). I have a dump program to dump the data structure that these #defines are used in into a .csv file. I used this little script to dump case statements out for the #defines, with readable strings instead of arbitrary constant values.

cat $1 | awk '/#define/{
print "\t\tcase " $2 ":";
print "\t\t\tfprintf(out_csv_fp,\"," $2 "\");";
print "\t\t\tbreak;";
}' > out.txt

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Awk script to quote all parameters for a given function name.

I was trying to maintain a program that wrote 200+ lines to a single file, using a single repeated function call--many of which had all NULL parameters. There were also occasional loops involved. The data was position based, so NULL writes counted.

I was just trying to figure out:
  1. How many times a given function was called.
  2. At what position actual data occurred.
I created a stub function of the original offending function that logged to a file what # call this was and the data passed. Then I copied the offending functions' caller and substituted offending function calls using this script, which quotes all passed parameters (note: already quoted parameters would need a little more work):

BEGIN {
OFS=","
}
/repeated_function_name/{

for(i=1; i<=NF; i++)
{
if(i==1)
{
sub("[(]", "(\"", $i);
}
else
{
sub("^[ ]*","\"", $i);
}
if(i==NF)
{
sub("[)]", "\")", $i);
}
else
{
sub("[ ]*$", "\"", $i);
}
}

print $0
next;
}
{ print $0; }

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