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Easy question - escaping double quotes

mdlittle
mdlittle asked
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Last Modified: 2008-03-17
I would like to know how to escape a double quote containted in a string.

If the string is "Did you say "Hello"?"

I would like it to read:

"Did you say \"Hello\"?"

Thanks
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ozo
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Commented:
Yes, that's correct.
jkr
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Top Expert 2012

Commented:
Indeed - this is absolutely correct...

Author

Commented:
I think you both missed my question. How would I do this in code? What functions would I use?
char text[100];

scanf("%s", text);

will read in text and escape whatever is necessary .. it isnt really escaping though ... just saying put the literal char in the array

escaping is only necessary when creating a string in the c code ... as in

char text[] = "Did u say \"hello\"?";

printf("%s", text);

gives

Did u say "hello"?

Author

Commented:
I need to take a string that has double quotes and change each double quote with \".

How would I do that in code?


The string has double quotes already and I want to change the string so that each double quoute is change from " to \".

Mike

Commented:
Or are you trying to get a string to contain:  "Did you say \"Hello\"?"

so that you can use that for the format argument for a printf? In that case you could initialize it as:

char *fmts = "Did you say \\\"Hello\\\"?";

Author

Commented:
Adjusted points to 200

Author

Commented:
Yes I want the string to have the \ before the double quote but I don't have control over the original string. I get it from a file.

Assume that I have a string that contains double quotes. The string is in a variable. I want to escape the double quotes.

As I stated above I need to change the double quotes to \".

I did not think this would be that difficult. Maybe I have not done a very good job explaining what I need.
ozo
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Commented:
char text[100];
char *p,*q;
for( p="Did you say \"Hello\"?",q=text; *q++=*p++; ){
     if( *p=='"' ){ *q++='\\'; }
}
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Author

Commented:
I suppose I would just replace the "\"Did you say \"Hello\"?" with a variable. Correct?

Like:
for( p=buffer,q=text; *q=*p; *q++=*p++){ if( *p=='"' ){ *q++='\\'; }

The formatted string is now in q?

Author

Commented:
I suppose I would just replace the "\"Did you say \"Hello\"?" with a variable. Correct?

Like:
for( p=buffer,q=text; *q=*p; *q++=*p++){ if( *p=='"' ){ *q++='\\'; }

The formatted string is now in q?

Author

Commented:
I suppose I would just replace the "\"Did you say \"Hello\"?" with a variable. Correct?

Like:
for( p=buffer,q=text; *q=*p; *q++=*p++){ if( *p=='"' ){ *q++='\\'; }

The formatted string is now in q?

Commented:
I'm not sure I understand WHY you are doing this.  It's not necessary to escape quotes except when they appear inside a quoted string in the SOURCE CODE of the program.  If the strings are being read in from a file or are alreay in a variable, then it is not necessary to go through this process...

Of course, your question is very ambiguous....

Author

Commented:
SQL

Author

Commented:
Thanks for not wasting my time and answering my question so quickly. Your code works very nicely.

Mike
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