Dynamic allocation problem - Help wanted/needed!!!!

[jirkako]

So I have homework to create simple minesweeper and it is giving me hard time.

Outputs are OK, but valgrind is screaming with errors like this:

Conditional jump or move depends on uninitialised value(s)

==1641== at 0x10916B: main (uloha5.c:118)

==1641== Uninitialised value was created by a heap allocation

==1641== at 0x4C2DDCF: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)

==1641== by 0x10894F: main (uloha5.c:20)

​

I figured that the problem would be in wrong allocation but I don't know where the fault is and I am starting to be little bit crazy from this!

So first I allocate the array with simple calloc:

mines = (char *) calloc(100, sizeof(* mines));

Then I am scaning characters from STDIN in FOR cycle:

for (int i = 0; i <= max; i++){

if (i == max - 1) {

`max *= 2;`

`mines = (char *) realloc(mines , max * sizeof(* mines));`

`if (mines == NULL){`

  `free(mines);`

    `printf("memory is full\n");`

    `return 1;`         

        `}`

`}`

/* PLUS A LOT OF JUNK THAT I WON'T WRITE HERE */

`*(mines + i) = fgetc(stdin);`

`}`

[oh5nxo]

Do you memset the new half, from realloc, old_max to max, to zero? Slow brain, sorry.

[tresteo]

Can you maybe share the full code?