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$ valgrind --track-origins=yes -s ./coder ../sample-2mb-text-file.txt ../res.txt
==18668== Memcheck, a memory error detector
==18668== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==18668== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==18668== Command: ./coder ../sample-2mb-text-file.txt ../res.txt
==18668== 
==18668== Conditional jump or move depends on uninitialised value(s)
==18668==    at 0x483EFB8: __strlen_sse2 (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==18668==    by 0x485548A: get_code (huffman.c:68)
==18668==    by 0x1095DA: main (coder.c:53)
==18668==  Uninitialised value was created by a stack allocation
==18668==    at 0x10933D: main (coder.c:6)
==18668== 
==18668== Conditional jump or move depends on uninitialised value(s)
==18668==    at 0x483EFB8: __strlen_sse2 (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==18668==    by 0x485544E: get_code (huffman.c:70)
==18668==    by 0x1095DA: main (coder.c:53)
==18668==  Uninitialised value was created by a stack allocation
==18668==    at 0x10933D: main (coder.c:6)
==18668== 
==18668== Conditional jump or move depends on uninitialised value(s)
==18668==    at 0x483EFB8: __strlen_sse2 (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==18668==    by 0x1096DA: main (coder.c:59)
==18668==  Uninitialised value was created by a stack allocation
==18668==    at 0x10933D: main (coder.c:6)
==18668== 
==18668== 
==18668== HEAP SUMMARY:
==18668==     in use at exit: 944 bytes in 2 blocks
==18668==   total heap usage: 16 allocs, 14 frees, 15,504 bytes allocated
==18668== 
==18668== LEAK SUMMARY:
==18668==    definitely lost: 0 bytes in 0 blocks
==18668==    indirectly lost: 0 bytes in 0 blocks
==18668==      possibly lost: 0 bytes in 0 blocks
==18668==    still reachable: 944 bytes in 2 blocks
==18668==         suppressed: 0 bytes in 0 blocks
==18668== Rerun with --leak-check=full to see details of leaked memory
==18668== 
==18668== ERROR SUMMARY: 14 errors from 3 contexts (suppressed: 0 from 0)
==18668== 
==18668== 3 errors in context 1 of 3:
==18668== Conditional jump or move depends on uninitialised value(s)
==18668==    at 0x483EFB8: __strlen_sse2 (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==18668==    by 0x485544E: get_code (huffman.c:70)
==18668==    by 0x1095DA: main (coder.c:53)
==18668==  Uninitialised value was created by a stack allocation
==18668==    at 0x10933D: main (coder.c:6)
==18668== 
==18668== 
==18668== 4 errors in context 2 of 3:
==18668== Conditional jump or move depends on uninitialised value(s)
==18668==    at 0x483EFB8: __strlen_sse2 (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==18668==    by 0x485548A: get_code (huffman.c:68)
==18668==    by 0x1095DA: main (coder.c:53)
==18668==  Uninitialised value was created by a stack allocation
==18668==    at 0x10933D: main (coder.c:6)
==18668== 
==18668== 
==18668== 7 errors in context 3 of 3:
==18668== Conditional jump or move depends on uninitialised value(s)
==18668==    at 0x483EFB8: __strlen_sse2 (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==18668==    by 0x1096DA: main (coder.c:59)
==18668==  Uninitialised value was created by a stack allocation
==18668==    at 0x10933D: main (coder.c:6)
==18668== 
==18668== ERROR SUMMARY: 14 errors from 3 contexts (suppressed: 0 from 0)

while((ch = getb(fl)) != EOF) 
{
    /*code*/ 
}