Memory leak when changing size of read input - c

Question

I´m facing really weird issue with my headtail application. When I try to read from file data.txt using Powershell (command: Get-Content data.txt | .\Headtail.exe head 10) I always get proper and expected output. However if I change input from data.txt to fail.txt I won´t get any output from output function (called vypis()).
Does anyone have an idead what is going on here?
GOOD CASE: Output from command (this output is suppose to be same using fail.txt as an input (meaning that content of the given input should be printed)) Get-Content data.txt | .\Headtail.exe head 10 in PowerShell:
aaaaaaaaaaaaaaaaaaaaaaaaaaaa.
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb.
ccccccccccccccccccccc.
dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd.
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee.
ffffffffffffffffffffffffffffffffffffffffffffffffffff.
ggggggggggggggggggggggggggggggggg.
hhhhh.
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii.
jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj.
WRONG CASE: Output from command Get-Content fail.txt | .\Headtail.exe head 10 in PowerShell:
/*NOTHING */
Code for my headtail function is following:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
int const size = 15;
int last_changed = 0;
typedef struct {
char **field;
int *columns;
int rows;
} TMatrix;
void set_size(TMatrix* matrix) {
for (int i = 0; i < matrix->rows; i++) matrix->columns[i] = size;
}
TMatrix* allocate() {
TMatrix* matrix = malloc(sizeof(TMatrix));
if (!matrix) return NULL;
matrix->field = malloc(size * sizeof(char*));
if (!matrix->field) return NULL;
matrix->rows = size;
matrix->columns = malloc(size * sizeof(int));
if (!matrix->field) return NULL;
set_size(matrix);
for (int i = 0; i < matrix->rows; i++) {
matrix->field[i] = malloc(size * sizeof(char));
if (!matrix->field[i]) return NULL;
}
return matrix;
}
void release(TMatrix* matrix) {
for(int i = 0; i < matrix->rows; i++) free(matrix->field[i]);
free(matrix->field);
free(matrix->columns);
free(matrix);
}
bool add_rows(TMatrix* matrix) {
matrix->rows += 10;
char** rebuf = realloc(matrix->field, matrix->rows * sizeof(char*));
if (!rebuf) {
free(rebuf);
return false;
}
matrix->field = rebuf;
int* rebufl = realloc(matrix->columns, matrix->rows * sizeof(int));
if (!rebufl) {
free(rebufl);
return false;
}
matrix->columns = rebufl;
for (int i = 1; i <= 10; i++) {
char* rebuh = realloc(matrix->field[matrix->rows - i], size * sizeof(char));
if (!rebuh) {
free(rebuh);
return false;
}
matrix->field[matrix->rows - i] = rebuh;
matrix->columns[matrix->rows - i] = size;
}
return true;
}
bool add_column(TMatrix* matrix, int row) {
matrix->columns[row] += 15;
char* rebuf = realloc(matrix->field[row], matrix->columns[row] * sizeof(char));
if (!rebuf) {
free(rebuf);
return false;
}
matrix->field[row] = rebuf;
return true;
}
TMatrix* load(FILE* in) {
char c;
int actual_row = 0, actual_column = 0;
TMatrix* matrix;
if (!(matrix = allocate())) return NULL;
while ((fscanf(in, "%c", &c)) != EOF) {
matrix->field[actual_row][actual_column] = c;
if (c != '\n') {
actual_column += 1;
if (((matrix->columns[actual_row]) - 1) == actual_column) {
if (!add_column(matrix, actual_row)) return NULL;
}
}
else if (c == '\n') {
actual_column +=1;
if (((matrix->columns[actual_row]) - 1) == actual_column) {
if (!add_column(matrix, actual_row)) return NULL;
}
matrix->field[actual_row][actual_column] = '\0';
actual_column = 0;
actual_row += 1;
last_changed += 1;
if (((matrix->rows) - 1) == actual_row) {
if (!add_rows(matrix)) return NULL;
}
}
}
return matrix;
}
bool output(FILE* out, TMatrix *matrix, double num_of_output_lines, char method[]) {
if (!matrix) return false;
if (num_of_output_lines <= 0) return false;
if (matrix->rows <= 0) return false;
if (num_of_output_lines > last_changed) return false;
if (strcmp("head", method) == 0) {
for (int i = 0; i < num_of_output_lines; i++) {
for (int j = 0; j < matrix->columns[i]; j++) {
if (matrix->field[i][j] != '\0') fprintf(out, "%c", matrix->field[i][j]);
else break;
}
}
}
else if (strcmp("tail", method) == 0) {
for (int a = (last_changed-1); a >= (last_changed - num_of_output_lines); a--) {
for (int b = 0; b < matrix->columns[a]; b++) {
if (matrix->field[a][b] != '\0') fprintf(out, "%c", matrix->field[a][b]);
else break;
}
}
}
else return false;
return true;
}
void Help() {
fprintf(stdout, "-------------------------------------------------------------------------------------\n");
fprintf(stdout, "* Help function - nothing important *\n");
fprintf(stdout, "-------------------------------------------------------------------------------------\n");
}
int main(int argc, char *argv[])
{
if (argc < 3 || argc > 4) {
printf("!Valid count of arguments entered! \n");
return -1;
}
if (strcmp("-h", argv[1]) == 0) Help();
double num_of_output_lines = atoi(argv[argc - 1]);
TMatrix* matrix = load(stdin);
if (!matrix) {
printf("!Error while loading! \n");
return -1;
}
if (!output(stdout, matrix, num_of_output_lines, argv[argc - 2])) {
printf("!Error while printing! \n");
return -1;
}
release(matrix);
return 0;
}
And content of data.txt (works fine, just an example input):
aaaaaaaaaaaaaaaaaaaaaaaaaaaa.
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb.
ccccccccccccccccccccc.
dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd.
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee.
ffffffffffffffffffffffffffffffffffffffffffffffffffff.
ggggggggggggggggggggggggggggggggg.
hhhhh.
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii.
jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj.
kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk.
lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll.
mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm.
nnnnnnnnnnnnnnnnnnnnnnnnn.
ooooooooooo.
ppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp.
qqqqqqqqqqqqqqqqqqqqqqqqqqqqqq.
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr.
sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss.
ttttttttttttttttttttt.
uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu.
vvvvvvvvvvvvvvvvvvvvvvvvvvv.
wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww.
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.
yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy.
zzzzzzzzzzzzzzzzzzzzzz.
And finally content of fail.txt (didn´t get any output, the difference is just in length of some rows):
aaaaa.
bbbbbbb.
cccc.
ddddddd.
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee.
ffffffffffffffffffffffffffffffffffffffffffffffffffff.
ggggggggggggggggggggggggggggggggg.
hhhhh.
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii.
jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj.
kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk.
lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll.
mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm.
nnnnnnnnnnnnnnnnnnnnnnnnn.
ooooooooooo.
ppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp.
qqqqqqqqqqqqqqqqqqqqqqqqqqqqqq.
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr.
sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss.
ttttttttttttttttttttt.
uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu.
vvvvvvvvvvvvvvvvvvvvvvvvvvv.
wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww.
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.
yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy.
zzzzzzzzzzzzzzzzzzzzzz.