What does this pointer-heavy C code do?

Posted by justRadojko on Stack Overflow See other posts from Stack Overflow or by justRadojko
Published on 2014-06-07T15:19:01Z Indexed on 2014/06/07 15:24 UTC
Read the original article Hit count: 148

Filed under:

c

|

pointers

Could someone explain to me what should two following lines do:

s.httpheaderline[s.httpheaderlineptr] = *(char *)uip_appdata;
++((char *)uip_appdata);

This is taken from uIP code for microcontrollers.

s - structure
httpheaderline - http packet presented as a string
httpheadrlineptr - integer value
uip_appdata - received ethernet packet (string)

If some more info is needed please let me know.

BTW. Eclipse is reporting an error on the second line with message Invalid lvalue in increment so i'm trying to figure out how to solve this.

Related posts about pointers

C++ smart pointers: sharing pointers vs. sharing data

as seen on Stack Overflow - Search for 'Stack Overflow'
In this insightful article, one of the Qt programmers tries to explain the different kinds of smart pointers Qt implements. In the beginning, he makes a distinction between sharing data and sharing the pointers themselves: First, let’s get one thing straight: there’s a difference between sharing … >>> More
handling refrence to pointers/double pointers using SWIG [C++ to Java]

as seen on Stack Overflow - Search for 'Stack Overflow'
My code has an interface like class IExample { ~IExample(); //pure virtual methods ...}; a class inheriting the interface like class CExample : public IExample { protected: CExample(); //implementation of pure virtual methods ... }; and a global function to create object of this class - createExample(… >>> More
char pointers & integer pointers (++)

as seen on Stack Overflow - Search for 'Stack Overflow'
i have two pointers, char *str1; int *str2; if i look at the size of both the pointers lets assume str1=4 bytes str2=4 bytes str1++ will increment by 1 byte but if str2++ will increment 4 byte could anybody tell e the concept behind this? >>> More
Smart pointers - cases where they cannot replace raw pointers

as seen on Stack Overflow - Search for 'Stack Overflow'
HI, I have this query about smart pointers. I heard from one of my friends that smart pointers can almost always replace raw pointers. but when i asked him what are the other cases where smart pointers cannot replace the raw pointers,i did not get the answer from him. could anybody please tell… >>> More
C++ Pointers: Number of levels of Indirection

as seen on Programmers - Search for 'Programmers'
In a C++ program that doesn't contain legacy C code, is there a guideline regarding the maximum number of levels of indirection that should be used in the source code? I know that in C (as opposed to C++), some programmers have used pointers to pointers for a multiple dimension array, but for the… >>> More

Developer IT

What does this pointer-heavy C code do? - Developer IT

What does this pointer-heavy C code do?

c

pointers

Related posts about c

Related posts about pointers

C++ smart pointers: sharing pointers vs. sharing data

handling refrence to pointers/double pointers using SWIG [C++ to Java]

char pointers & integer pointers (++)

Smart pointers - cases where they cannot replace raw pointers

C++ Pointers: Number of levels of Indirection

Categories cloud