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Re: Parse input string and input file with same buffer state


From: Hans Åberg
Subject: Re: Parse input string and input file with same buffer state
Date: Thu, 7 Dec 2017 22:00:31 +0100


> On 7 Dec 2017, at 21:14, Harsha Sharma <address@hidden> wrote:
> 
> On Fri, Dec 8, 2017 at 1:17 AM, Hans Åberg <address@hidden> wrote:
>> 
>>> On 7 Dec 2017, at 18:59, Harsha Sharma <address@hidden> wrote:
>>> 
>>> I'm looking for a way to parse input string and input file (pushing
>>> buffer state created with yy_scan_string to buffer state created with
>>> yy_create_buffer to parse input file). It either causes segmentation
>>> fault or parses either the string or the input file.
>> 
>> The string pointed to (in a lexer generated by Flex) must be copied before 
>> passed on elsewhere, as it is just a pointer in a buffer, temporarily 
>> null-terminated.
>> 
> This is what I'm exactly trying to do .

In the .l file, the string pointed to by yytext of length yyleng must be 
copied. Does it do that?

> I have a string passed from
> command line which needs to be parsed 'define test="foo"' and input
> file references this variable.
> Same thing can be done by prepending this line in input file 'define
> test="foo"' but I want to have a command line option for the same.

Can you read the input as a stream instead of first putting it into a string?





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