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sed and awk usage to grep a pattern 1 and with reference to this grep a pattern 2 and pattern 3

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# 1  
Old 06-11-2014
sed and awk usage to grep a pattern 1 and with reference to this grep a pattern 2 and pattern 3
Hi ,

I have a file where i have modifed certain things compared to original file . The difference of the original file and modified file is as follows.

Code:
[root@ossvm24 mir_common]# diff mir_lex.c.modified mir_lex.c.orig
3209c3209
<                       if(yy_current_buffer -> yy_is_our_buffer == 0) {
---
> #ifdef YY_USES_REJECT
3212,3213c3212,3213
<                       }
<                       else {
---
> #else
>
3246,3247c3246,3247
<                       }
<               }
---
> #endif
>                       }

In the above mentioned diff , we can see that
Code:
#ifdef YY_USES_REJECT

is replaced by i
Code:
f(yy_current_buffer -> yy_is_our_buffer == 0) {

,

and the only the next occurence of
Code:
#else

should be replaced to two line i.e
Code:
}
else {


and next occurence of
Code:
#endif

should be replaced by
Code:
}

.

Please let me know how do i achieve this using sed and awk .

Regards,
Vinay
Last edited by Scrutinizer; 06-11-2014 at 05:39 AM.. Reason: code tags
# 2  
Old 06-11-2014
Why would you want to use sed/awk for this? What are you trying to achieve? Did you have a look at the patch command?
# 3  
Old 06-11-2014
@Vinay
Have a look into following link:
https://linuxacademy.com/blog/linux/...iff-and-patch/

It uses both diff and patch. Explains you exactly for what you're looking.
# 4  
Old 06-11-2014
Actually i wont be having modified file , i having shown the diff to explain my requirement . Actually we will be having only original file which gets generated while compiling a make file , so in the make file at the time of generation i wanted to introduce all the modification rather the differences which which i have shown . So to meet this requirement , i need to modify the original file only . So for modification i may need sed and awk , if there is any other way also it is fine.
# 5  
Old 06-11-2014
You could try something like:
Code:
#!/bin/ksh
end_fmt='\t\t\t}\n'
else_fmt='\t\t\t}\n\t\t\telse {\n'
if_fmt='\t\t\tif(yy_current_buffer -> yy_is_our_buffer == 0) {\n'
if_tag='YY_USES_REJECT'
awk -v end_f="$end_fmt" -v else_f="$else_fmt" -v if_f="$if_fmt" -v t="$if_tag" '
$1 == "#ifdef" && $2 == t {
	iff = 1
	printf if_f
	next
}
iff && $1 == "#else" {
	printf else_f
	next
}
iff && $1 == "#endif" {
	iff = 0
	printf end_f
	next
}
1' makefile

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk.
If you have a file named makefile that contains:
Code:
#ifdef YY_USES_REJECT
				some text
#else
				some more text
#endif
			text after endif
#ifdef YY_OTHER_TAG
				nothing should happen here
#else
				or here
#endif
			or here.  Above #ifdef should not have been changed.
#ifdef YY_USES_REJECT
				some text again
#else
				some more text again
#endif
			text after endif again

the script above will produce the output:
Code:
			if(yy_current_buffer -> yy_is_our_buffer == 0) {
				some text
			}
			else {
				some more text
			}
			text after endif
#ifdef YY_OTHER_TAG
				nothing should happen here
#else
				or here
#endif
			or here.  Above #ifdef should not have been changed.
			if(yy_current_buffer -> yy_is_our_buffer == 0) {
				some text again
			}
			else {
				some more text again
			}
			text after endif again

This User Gave Thanks to Don Cragun For This Post:
breezevinay
# 6  
Old 06-12-2014
Thanks a lot Don Cragun . It is working ..
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