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Segmentation fault / Incorrect checksum triggered ocasionally when reading lines from a file


Segmentation fault / Incorrect checksum triggered ocasionally when reading lines from a file

By : Joey Powell
Date : September 23 2020, 01:00 PM
wish helps you I'm trying to implement a function that gets every line from a file and prints it. For some reason, when running it I get a segmentation fault sometimes, sometimes it just runs fine, sometimes it exits with a incorrect checksum for freed object. I don't know which pointer is not being freed/modified after freeing it, can I get some clue?
code :
temp = malloc(leng + 1);
strlcat(temp, l, strlen(temp) + (leng - strlen(aux)) + 1);
        while ((ret = get_next_line(0, &buff)) > 0)
            printf("[Return: %d] Line #%d: %s\n", ret, ++line, buff);
        /* ... */
        free(buff);


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Segmentation Fault while reading specificly 13 lines

Segmentation Fault while reading specificly 13 lines


By : user3601270
Date : March 29 2020, 07:55 AM
I wish did fix the issue. In your printLines function, "while(lines[lineI] != NULL)"
What is happening is that lines[lineI] isn't NULL, it just hasn't been allocated at the end. So because lineI is greater than nLines, it segfaults. You have to pass nLines into the function and use that to check boundries. "while (lineI < nLines)"
string segmentation fault when reading lines from text file

string segmentation fault when reading lines from text file


By : Haipeng Wang
Date : March 29 2020, 07:55 AM
To fix this issue You should not be reading the file twice (once for the number of lines and once for the lines themselves). As suggested by others, using a std::vector is well suited. Here is an example:
code :
#include <iostream>
#include <string>
#include <fstream>
#include <vector>
#include <iterator>

int main( int argc, char ** argv )
{
    if( argc != 2 )
        return 1;
    std::vector< std::string > lines;
    std::ifstream infile( argv[1] );
    if( infile.is_open() )
    {
        std::string buffer;
        while( std::getline( infile, buffer ).good() ) 
            lines.push_back( buffer );
        inflie.close();
    }
    size_t numberoflines = lines.size();

    std::ostream_iterator< std::string > out( std::cout, "\n" );
    std::copy( lines.begin(), lines.end(), out );
}
malloc error: incorrect checksum for freed object in struct for reading file

malloc error: incorrect checksum for freed object in struct for reading file


By : Amadou Dia
Date : March 29 2020, 07:55 AM
I wish this help you So I have this function: , This is probably not what you want to do:
code :
source_t * temp = (source_t *) malloc(sizeof(source_t *));
Segmentation fault when reading from a file

Segmentation fault when reading from a file


By : hashemabu
Date : March 29 2020, 07:55 AM
Does that help Probably the if (result != size - 1) test is failing and then you reset *data to NULL (which is a memory leak, BTW), and then you try to write to (*data)[size-1] - oops !
Segmentation fault while reading a file in C

Segmentation fault while reading a file in C


By : MoonLight
Date : March 29 2020, 07:55 AM
I hope this helps . The trouble is that sizeof(inputFile) does not return the size of the file. It returns the size — in bytes — of the FILE* pointer; the size of that pointer is completely unrelated to the size of the underlying file.
What you're looking for is discussed in How do you determine the size of a file in C?
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