I put together a C function to add strings to a dynamic array of strings (mostly for educational purpose to explain pointers to my kid). It works, but sometimes one or two strings in the array becomes corrupted. Running example on 64 bit Ubuntu, gcc ver. 4.8.4
Hope my code is self-explanatory:
And here is the culprit, I removed error checking and temp pointer to hold results of the realloc for brevity:
Result:
The length of those strings does not seem to matter. If I have 2 - 3 strings in the array it is OK, but when I add more than 4 then some strings got corrupted.
When I debug I see it happens when indx is 4 and I assign address of duplicated string to the array: arr[0][indx] = strdup(str);
Any help with finding the bug would be appreciated.
Also, I hate the [0][indx] notation, but could not come up with a better one.
I am having a problem with shared memory corruption. I have two 86 servers running Solaris 10 (150400-06). One of the servers is accessed by a Sun Ray thin client Version 11.1.3.0.2.6. I login into server one from the thin client. I then ssh -X to server two. When a process that contains a... (2 Replies)
I am facing a problem of memory corruption. The loop runs for the first time but does not go through the second time. What could be the problem?
for(int z=0;z<2;z++)
{
fp=fopen("poly.dat","r");
/*do something which reads this file into a 2D array*/
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*** glibc detected *** ./a.out: malloc(): memory corruption (fast):
Posted A minute ago
M trying to make multiway tree and dont know what happend when this part of code get executed:
01void ins(NODE *ptr)
02{
03 //working
04 if(ptr!=NULL)
05 {
06 SNODE *var=NULL;
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Hi All,
I have a simple code which does some computation by matching string patterns.
In brief:
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2. .dat files are huge text files and .txt files contain some important words.
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I am developing an utility.
At some part of it I read directory entries to a dynamic array: struct list
It stores pointers to items: list.entries,
which are structures: struct entry
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Hi every body
I have a problem like that "Dynamic linker error" message.
I can't load many of programs in sco unix openserver 5.0.6.
I guess this problem appear after my last effort to install "SCO Development System" package.
How can I fix this problem?
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why it ocurrs and how to deal with it?
in a function:
if( *ver == NULL ) {
*ver = (vertex *) malloc(sizeof(vertex)); //this line
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Hello, everyone.
I got the following error when I am using awk to analysis some text file:
*** glibc detected *** awk: malloc(): memory corruption: 0x080c67f8 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6
/lib/tls/i686/cmov/libc.so.6... (5 Replies)
I am facing a strange error while creating posix threads:
Given below are two snippets of code, the first one works whereas the second one gives a garbage value in the output.
Snippet 1
This works:
--------------
int *threadids;
threadids = (int *) malloc (num_threads * sizeof(int));
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