All Questions
19 questions
0
votes
2
answers
18
views
Getting segmenatation fault even though i freed memory
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
typedef uint8_t BYTE;
int main(int argc, char *argv[])
{
// Only allow 2 command line arguments
if (argc != 2)
...
0
votes
1
answer
35
views
pset4 speller trie segmentation fault
I am doing the trie version of speller in pset4 and keep getting a segmentation fault.
I have run my code on short dictionaries and short text files and it seems to work just fine but when I try ...
- 3
0
votes
1
answer
154
views
PSET4 (Speller) malloc and calloc usage
After getting my code to work, i looked if there were any memory leaks using valgrind. It found no memory leaks, however it returned these two errors:
==7109== Conditional jump or move depends on ...
- 103
0
votes
1
answer
115
views
PSET4 free on malloc in hash function
I'm trying to improve my hash function in Speller and I'm having trouble freeing allocated memmory.
I'm getting * Error in `./speller': free(): invalid pointer: 0x0000000001a02252 *
Aborted
I know ...
- 1
0
votes
1
answer
77
views
PSET 4: Resize. Does not work with dynamic buffer, only static
I managed to make resize work using a static array to store a row of pixels for the outfile (rewrite method). However, my first attempt with a dynamic array doesn't work, and I don't understand why. ...
- 11
0
votes
1
answer
2k
views
PSET4: free(): invalid next size (fast)
So as the title says, I'm trying to do the pset4 where I get this error when I try to execute the program. I've searched the forum and also Reddit, and I understood that I've some issue with the ...
- 13
0
votes
1
answer
288
views
pset4 recover with malloc having a segmentation fault
I can't seem to find the reason of why I'm getting the segmentation fault in my code. The moment my code starts to write the bytes of buffer, I encounter the fault
Any help is really appreciated.
#...
- 11
0
votes
1
answer
49
views
What will happen if you assign a static value to a pointer in C?
In this example, what will it happen if I assign for example:
pk = 6;
Thanks!
0
votes
1
answer
804
views
pset4 recover.c - working with fread() and malloc()
I'm attempting recover.c and I'm interested in clearing up a few things about fread() and malloc().
I tried to sample the first few bytes of the card.raw file but I keep getting the same two errors: ...
- 15
0
votes
1
answer
240
views
pset 4 recover - segmentation fault with malloc
I seem to be stuck on pset4 recover and would appreciate some help! I think I understand the idea of the problem set by now but I've done approached the problem a bit unconventionally and keep getting ...
0
votes
1
answer
605
views
pset4 resize: how to copy a row
Just spent 2 days for figuring out how fread(), fwrite() and fseek() works.
I tried to use "Rewrite" method from Zamyla's video for vertycal resizing:
- Remember pixels in array (first written row of ...
0
votes
2
answers
246
views
Segmentation fault in recover.c (pset4)
On checking with valgrind, I get main (recover.c:89)
==14182== Address 0x55022c8 is 0 bytes after a block of size 8 alloc'd
There are 2 more problems with malloc again, while doing sprintf and ...
0
votes
0
answers
143
views
pset4/resize | reading and writing a file simultaneously?
I'm trying to use "malloc" approach to the task. My algorithm is:
draw a multiplied scanline into a new file
fread this line, save itto a string, write it to the file factor-1 times
do the same ...
- 3
0
votes
1
answer
212
views
pset 4 Recover creates 50 corrupted or mainly grey images
I wanted to try using malloc and a BUFFER structure of 512BYTES for this exercise with the intention of creating a file if the 4 signatures of a JPG are detected and fwriting the struct of 512B into ...
- 3
0
votes
1
answer
494
views
pset4 malloc() approach. Help with size of buffer
I'm having some trouble with the malloc function.
I want to make a buffer the size of the new row I'm going to write in the resized file, and this is my approach.
I must say that bi.biWidth is ...
0
votes
1
answer
191
views
Want to make sure I understand struct, malloc, and pointers and how they relate to each other
Sort of related to PSET4 resize, but actually want to make sure I understand this in general.
So at first I just declared a struct BITMAPINFOHEADER called "new_bi" and dealt with it while avoiding ...
0
votes
1
answer
76
views
How can I avoid a Segmentation fault in my Recover.c
I have looked thoroughly through other solutions, but they tend to be specific to another person's code. I have also used Valgrind to try and isolate the problem, and considered that I may have to use ...
0
votes
1
answer
64
views
Pset4 Recover fails check, looks right and file sizes are right
struggling with the last piece of the puzzle for Recover. I'm pretty sure It's related to a memory leak of sorts, but I fail to understand how to resolve it. Here is my code: http://pastebin.com/...
0
votes
1
answer
480
views
fread not putting what I expect in buffer
for Pset4, recover, I'm trying to read 4 bytes from card.raw into a buffer. I''m testing the first 4 bytes of card.raw with what my buffer contains using gdb, and I'm not getting the same thing. I ...
- 22