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Script to insert a function into a C source file

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# 1  
Old 09-17-2012
Script to insert a function into a C source file
Hello,

I think I need sed, but perhaps awk could help.

I am trying to add a function to a C source file based off a struct declaration.

for example:

Code:
struct Rational
{
   int numerator;
   int denominator;
};

becomes

Code:
struct Rational
{
   int numerator;
   int denominator;
};

void init_Rational(struct Rational *ret, int numerator, int denominator)
{
   ret->numerator = numerator;
   ret->denominator = denominator;
}


How would I go about doing this?
# 2  
Old 09-17-2012
Try using awk:

Code:
awk '/^struct/ {s=$2;o=$0;next}
!o
o {o=o"\n"$0}
o && /int/{gsub(/;/,"");L[$2]++}
o && /}/ {
   printf("%s\n\nvoid init_%s(struct %s *ret", o, s, s)
   for(k in L) printf(", int %s", k)
   print ")\n{\n"
       for(k in L) printf("    ret->%s = %s;\n", k, k)
   print "}"
   split("",L);
   s=""
   o=""}' infile.c

# 3  
Old 09-18-2012
Same awk solution but supports formats:

Code:
struct Rational
{
   int numerator;
   int denominator;
};

Code:
struct Rational { int numerator; int denominator; };

Code:
struct Rational
{
   int numerator; int denominator;
};

Code:
struct Rational
{ int numerator; int denominator; };

awk code:

Code:
/^struct/ {r=1;}
r==1 {o=o $0; print $0;}
/}/ {
   ic=0;
   c=split(o,a);
   for (i=1; i<=c; i++) {
     if (a[i] ~ /^struct$/) {s=a[i+1]; sub("[^a-zA-Z_-]*$","",s);};
     if (a[i] ~ /^int$/) {t=a[i+1]; sub("[^a-zA-Z_-]*$","",t); L[t]=t;};
   }
   printf("\nvoid init_%s(struct %s *ret", s, s);
   for(k in L) printf(", int %s", k);
   print ")\n{"
   for(k in L) printf("    ret->%s = %s;\n", k, k)
   print "}\n\n"
   r==0;
   f="";
}

Last edited by rdrtx1; 09-18-2012 at 01:03 AM..
# 4  
Old 09-23-2012
If you're going to ask for help with your homework, there's a homework forum with additional posting requirements. Read the FAQ.
https://www.unix.com/homework-coursew...ons-forum.html

Regards,
Alister
# 5  
Old 09-24-2012
For typedef struct
Hello
Could you do the same for structures defined using typedef?

For example:

Code:
typedef struct {
  int numer;    
  int denom; 
} Rational;

should turn into:

Code:
typedef struct {
  int numer;    
  int denom; 
} Rational;

void init_Rational( Rational *ret, int numer, int denom )  
{   
   ret->numer = numer;    
   ret->denom = denom; 
}

Remember that the name could be anything(not just Rational) and there could be any number of values inside the struct definition(not just numer and denom).

Also ret is just a random name. It is just used to initialize.

Thanks a lot
Last edited by James Denton; 09-24-2012 at 11:58 AM..
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