fopen memory corruption error Peggs Oklahoma

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fopen memory corruption error Peggs, Oklahoma

I notice you have a asize variable, which is initialised to the length of alphabets. evansash View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by evansash 03-21-2011, 12:28 AM #2 smeezekitty Senior Member Registered: Sep 2009 Location: Interestingly, the program crashes during normal execution and GDB, but not Valgrid. I would have thought he would had just wanted to return the pointer value itself as in: Code: return result; [Disclaimer: that was meant to be a hint for the OP

Thanks for the help, gentlemen. I'll look into fixing the other issues. –user974703 Oct 19 '11 at 22:44 add a comment| up vote 2 down vote This (line 93) is suspect: buf[strlen(buf)-1]='\0'; UPDATE This (line 99,100) Can you post some of the code before the fopen? Index Nav: [DateIndex] [SubjectIndex] [AuthorIndex] [ThreadIndex] Message Nav: [DatePrev][DateNext] [ThreadPrev][ThreadNext] Other format: [Raw text] help request: Usage of fopen() leading to heap overflows From: Dragon

a bullet shot into a suspended block Export The $PATH Variable, Line-By-Line Open hemisphere is connected Trouble understanding charging capacitor on bridge rectifier How to know CPU frequency? Think strlen. Search Engine Optimisation provided by DragonByte SEO v2.0.32 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd. User contributions on this site are licensed under the Creative Commons Attribution Share Alike 4.0 International License.

I'm leaving the filename as is, once I have things working, then I'll do the error checking. Click on OK to terminate the program. If you want to make the malloc more portable (for whatever reason), use sizeof(*temp). –Olaf Jul 12 '15 at 12:33 ftell returns a long int. Tango Icons © Tango Desktop Project.

worzel1968 View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by worzel1968 03-21-2011, 04:38 AM #10 posixculprit Member Registered: May 2010 Posts: 136 I would try increasing the size of the arrays drastically and seeing if the problem is reproduced. For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. Remember that in C, arrays starts with index zero, and an array of 10 can only be indexed by index 0 to 9.

The first parameter (original) should probably be const, but I can't be sure, but you probably intend for it to not be trounced by strtok when it tokenizes the string since Please let me know if I am declaring them wrong. I was only calling six small methods when I got it, so I went back and checked and think I found something I had accidently not cleaned up. evansash View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by evansash Thread Tools Show Printable Version Email this Page Search this Thread Advanced

Is it a general memory allocation problem and it just so happens that it rears its ugly head in fopen()? What is the difference between a crosscut sled and a table saw boat? Last edited on Jul 20, 2010 at 6:20am UTC Jul 20, 2010 at 5:57am UTC helios (13230) Is this ALL the code in the program? posixculprit View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by posixculprit 03-21-2011, 03:10 AM #7 evansash LQ Newbie Registered: Mar 2011 Posts:

That might be the same width as int, but you should not rely in it. –Olaf Jul 12 '15 at 12:37 | show 1 more comment 1 Answer 1 active oldest Please let me know if you need more info. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Can Dandelion defeat you?

current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. If Dumbledore is the most powerful wizard (allegedly), why would he work at a glorified boarding school? Password Home Search Forums Register Forum RulesMan PagesUnix Commands Linux Commands FAQ Members Today's Posts Programming Post questions about C, C++, Java, SQL, and other programming languages here. I erased the malloc in favor of creating a static array.

Don't forget about valgrind as a troubleshooting tool. It dies when I "write" a file to the server. The "test.txt" was to check whether or not it was my string that was causing the problem. All rights reserved.

Also, you seem to have a good case of using a: Code: struct point { float x; float y; } And use an array of structs instead of two parallel arrays If you corrupted memory using malloc, then allocate the same amount of space statically and the 'problem goes away', what makes you think you aren't still overwriting the bounds? If the xp[] values are 0, the loop can run more times than the length of xp[]. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

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#4 06-23-2013 alister Registered User Join Date: Dec 2009 Last Activity: sizeof(char*) is not the length of the string it points to. The point that might confuse some, is that I'm implementing packet loss myself, with a number generator. share|improve this answer edited Oct 19 '11 at 16:34 answered Oct 19 '11 at 16:22 wildplasser 24.3k22748 Oops, someone (nos) already saw it. –wildplasser Oct 19 '11 at 16:23

Faq Reply With Quote April 17th, 2008,12:56 AM #3 No Profile Picture HRDirector View Profile View Forum Posts  Contributing User Devshed Newbie (0 - 499 posts)    I no longer wish to be associated with this site. Messy code brings it's own problems. - Harder to write, - Harder to debug, - Easier to add bugs to it - Impossible to get anyone else to give a damn Cheers David 1 members found this post helpful.

Right now it doesn't do anything really, besides make the program use another recvfrom. Not the answer you're looking for? also,does -g mean using gdb to detect errors? I am so sorry for the confusion.

Why is absolute zero unattainable? Somewhere I read this happens with char pointers and copying them to char arrays should make the problem go away and it did. strlen returns size_t. Here is the code for that prog, if it helps: Code: #include #include #include #include "suffixtree.h" char *strip_copy(const char *s) { char *p = malloc(strlen(s) + 1); if(p) { char *p2

pset6 server share|improve this question asked Aug 14 at 17:55 Finn Ashley 32 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote accepted I don't know When it calls malloc, malloc aborts after detecting corruption caused by fseek writing to memory freed by fclose. Click Here to receive this Complete Guide absolutely free. If you need to reset your password, click here.

You can change a few things that are unrelated to the problem and it will simply change the problem. If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut. strcat(fullstring,chunk); // line 124 UPDATE3: UDP is unreliable. For details and our forum data attribution, retention and privacy policy, see here Register Remember Me?

After cleaning it up, the error disappeared. I agree with KBW by the way. Chances are a close inspection of the code will yield many bugs.