gcc - C Get function line number from within 2 function calls -


in process of developing small sdk, need create "error handler". make more effective want line number function called , don't know if it's possible in c (using gcc compiling).

when sdk function called, sdk function call error handler function if error occurred.

with i'd know if there way know line number user source code called function.

example :

user.c :

main{ callsdkfunction(); }

sdk.a file :

void callsdkfunction( void ){ if ( error ){ callerrorhandler(); } }

... ... ...

void callerrorhandler( void ){ // here want know in line in user.c callsdkfunction called}

one approach pass __file__ , __line__ sdk function, , have sdk function pass them on error handler function. however, user won't want bothered that, need define macro in sdk's header file hides details. macro this

#define callsdkfunction(a,b) actualsdkfunction( __file__, __line__, a, b )

the user call sdk code this. note user doesn't need know __file__ , __line__ being passed sdk function. macro takes care of that.

int main( void ) {     int = 3;     int b = 4;     int result = callsdkfunction( a, b );       printf( "%d\n", result ); }

and sdk implementation this

int actualsdkfunction( const char *filestr, int linenum, int a, int b ) {     if ( a+b > 5 )         callerrorhandler( filestr, linenum );     return( a+b ); }  void callerrorhandler( const char *filestr, int linenum ) {     printf( "bad values in file %s @ line %d\n", filestr, linenum ); }

Comments

Post a Comment

Popular posts from this blog

How to connect android app to App engine -

i'm trying connect app in android server i've opened on appengine. my server's name : dddd-daniel-2345 , website server : http://dddd-daniel-2345.appspot.com/ this how connect android app server in app engine: app.yaml: application: dddd-daniel-2345 version: 1 runtime: python27 api_version: 1 threadsafe: yes handlers: - url: .* script: main.app libraries: - name: webapp2 version: "2.5.2" main.py: #!/usr/bin/env python # # copyright 2007 google inc. google.appengine.api import users import webapp2 class userhandler(webapp2.requesthandler): def get(self): user = users.get_current_user() if user: greeting = ('%s,%s,%s' % (user.email(),user.user_id(),user.nickname())) else: greeting = ('not logged in') self.response.out.write(greeting) app = webapp2.wsgiapplication([('/', userhandler),], debug=true) my applications code : add manifast main....
Read more

gcc - MinGW's ld cannot perform PE operations on non PE output file -

i know there other similar questions out there, stackoverflow or not. i've researched lot this, , still didn't find single solution. i'm doing operative system side project. i've been doing in assembly, wanna join c code. test, made assembly code file (called test.asm): [bits 32] global _a section .text _a: jmp $ then made c file (called main.c): extern void a(void); int main(void) { a(); } to link, used file (called make.bat): "c:\mingw\bin\gcc.exe" -ffreestanding -c -o c.o main.c nasm -f coff -o asm.o test.asm "c:\mingw\bin\ld.exe" -ttext 0x100000 --oformat binary -o out.bin c.o asm.o pause i've been researching ages, , i'm still struggling find answer. hope won't flagged duplicate. acknowledge existence of similar questions, have different answers, , none work me. question: what doing wrong? old mingw versions had problem "ld" not able create non-pe files @ all. maybe current versions...
Read more

php - display validation error message next to the textbox in codeigniter -

Image
i'm newbie codeigniter.i want display error message next text box.my view file create.php contains following code. <?php echo validation_errors(); //validation echo form_open('news/create'); //create form ?> <div class="boxes"> <div class="common"> <div class="lables"> <label for="name">name</label> </div> <div class="text_boxes"> <input type="text" name="uname" /><div id="infomessage"><?php echo $message;?></br> </div> </div>` and below controller model: public function create() { $this->load->helper('form'); $this->load->library('form_validation'); $data['title'] = 'insert items'; $this->form_validation->set_rules('uname','required|min_length[6]|m...
Read more