I was referring a site called "joys of programming" for JSON Parser in C. The site seems down and I am not able to get information regarding JSON parser. It would be great if some one can guide me. I want to know how to create a JSON Array.Thanks in advance.
If you want to make you own json parser, you have to look at the language grammar, which is probably LL. Writing such a LL parser is almost trivial and kind of funny, use a regex library to save a precious time.
If you're looking for a library to deal with Json data, here is the second result Google gave me.
I found several lib could do this work.
Jsoncpp, JsonValue, cppCMS, JsonSpirit and Jansson. The jsonvalue is the easiest one. It just contains a pair of .h file and .cpp file.
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How to read contents from file in ocaml? Specifically how to parse them?
Example :
Suppose file contains (a,b,c);(b,c,d)| (a,b,c,d);(b,c,d,e)|
then after reading this, I want two lists containing l1 = [(a,b,c);(b,c,d)] and l2 = [(a,b,c,d);(b,c,d,e)]
Is there any good tutorial for parsing?
This is a good use case for the menhir parser generator (successor to ocamlyacc). You might want to use ocamllex for lexing. All have good documentation.
You could also use camlp4 or camlp5 stream parsing abilities.
Read also the wikipedia pages on lexing & parsing.
I'd be inclined to use Aurochs, a PEG parser for something like this. There is example code in the repo there.
If you want to specify a grammar and have ocaml generate lexers and parsers for you, check out these ocamllex and ocamlyacc tutorials. I recommend doing it this way. If you really only have one type of token in your file format, then ocamlyacc might be overkill if you can just use the lexer to split the file up into tokens that are considered valid by the grammar.
I would like to know which file format i can use to store(and easily parse and read) certain configuration items and their values. On eoption is INI file. Is there any other option like .opt file?
EDIT:
I am using C language.
Look into XML. It's got implementations in many languages and is pretty easy to parse and create.
But a lot of it has to do with what language you're using.
http://www.w3schools.com/xml/default.asp
Personally, I like to use XML files for configuration options. Most non-power users can understand them relatively easy enough and there are many libraries out there that make them super easy to parse.
I have a c program, that gets its settings from an XML file. Currently I'm using Xerces to traverse the data, but it's getting quite tedious to map each XML-value to a variable.
The same XML is also read by a Java program, which is much more convenient due to JAXB creating all the necessary classes and such in Java. I'm looking for something similar that can create a "structure of structs" or some such. It's important that I get c structs, and not c++ classes, because this code will run on GPUs.
I found "XML Booster", and am currently reading it docs. Do you know of other options? Needs to be usable in linux.
i use the libxml library. You still have to traverse the XML, but you get a linked list with elements, attribues, nodes and children-nodes, which you can follow.
link: http://xmlsoft.org/index.html
Given your XML files have common pattern, you can use Bison+Flex or simply ANTLR (C runtime) to construct grammar and extract the values from the XML files to variables. Those will produce parsers in pure C so you have nothing to worry about.
If you have an xml schema, check out xsd codesynthesis. It generates nice c++ objects for your xsd and you don't need to deal with xerces directly:
http://www.codesynthesis.com/products/xsd/
I need a function to encode base64 and a function to decode base64 string in c. I found http://base64.sourceforge.net/b64.c but the functions work on files, not strings, and add line breaks. I need one that simply encodes/decodes strings. Where can I find such a sourcecode?
Get the functions from libb64.
If you have openssl available to you (which most *nix distros seem to have out-of-the-box these days), it provides robust, well-tested base64 encoding/decoding out of the box. This site has a decent code sample: Howto base64 decode with C/C++ and OpenSSL
When I needed to use Base64 encoding to build an encrypted email server, I decided to build my own implementation.
Currently, it's placed within a C++ class; but I wrote the encoding functions without using any c++ specific code, so you can copy and paste as you please.
This implementation is not approved by any organizations; but it should help you with learning how the algorithm works, while also giving you access to just base64 encoding. IE: no extra libraries get included.
https://github.com/AlexBestoso/Base64
Use as you please. The functions take chars, maps them to an integer via bit-wise operations, and then produces your result.
Currently, there's no newline or carriage return, which specified in the MIME implementation.
If you decide to use the code and find any bugs, let me know through github.
I'm looking for an open-source SGML parser written in plain C. This is to parse bona-fide SGML, not malformed stuff.
Any ideas?
There's OpenSP, which is part of the OpenJade project, but is implemented in C++. Might be close enough for your needs?
This came up on a fast Google search (sgml c parser): http://www.w3.org/Library/src/SGML.html. Does that help?
Or perhaps this one: http://www.math.utah.edu/pub/sgml/sgmls/