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This project outputs G-code that is used to control a 4-axis hot wire cutter, employed to cut a wing / airfoil from a physical block of foam. Effectively, it is a slicer for a particular arrangement of raw-coordinate data files.

License: GNU General Public License v2.0

C 99.62% CMake 0.38%

airfoil airfoils aerospace aeronautics aerodynamics wings foam gcode cut c

gcode's Introduction

DIY Airfoils you say? Put numbers in, get G-code out!

This project outputs G-code that is used to control a 4-axis hot wire cutter, employed to cut a wing / airfoil from a physical block of foam. Effectively, it is a slicer for a particular arrangement of raw-coordinate data files.

What is G-code?

I wrote this for a family member who was, at the time, working in airfoil design. The code is designed to be cross-platform (Windows, OS X, and Linux).

Quick Rundown

Eight input files are provided to the program; each input file is formatted in the following manner:

   <integer:total_values_to_follow>
   <float:value1>
   <float:value2>
   <...>
   <float:valueN>

So that an input file may look like:

Where "3" is the number of values to follow, with the three following values on separate lines.

Each input file is named to correspond with a technical section of the wing / airfoil (Root & Tip; Upper & Lower halves; X & Y coordinates). The input file names are, at this time, constant and should not be changed. In other words, all of the input files must be present and reasonably formatted for the program to function.

Input files:

"ROOTUPPERX", "ROOTUPPERY", "ROOTLOWERX", "ROOTLOWERY", "TIPUPPERX", "TIPUPPERY", "TIPLOWERX", "TIPLOWERY"

Output file:

"OUTPUT.txt"

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gcode's Issues

"filename" memory should be freed on exit/failure

OpenDataFiles() uses a filename variable to construct filenames, and this variable is initialized with a malloc(...) call. However, it is not freed when the function exits on failure.

Valgrind Errors

$ valgrind --leak-check=yes ./gcode
==16026== Memcheck, a memory error detector
==16026== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==16026== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==16026== Command: ./gcode
==16026==
==16026== Invalid write of size 1
==16026== at 0x4C306EF: strcat (vg_replace_strmem.c:307)
==16026== by 0x4009E0: OpenDataFiles (gcode.c:138)
==16026== by 0x4008BE: main (gcode.c:87)
==16026== Address 0x52042ba is 0 bytes after a block of size 10 alloc'd
==16026== at 0x4C2DBF6: malloc (vg_replace_malloc.c:299)
==16026== by 0x40098E: OpenDataFiles (gcode.c:131)
==16026== by 0x4008BE: main (gcode.c:87)
==16026==
==16026== Syscall param open(filename) points to unaddressable byte(s)
==16026== at 0x4F31010: __open_nocancel (syscall-template.S:84)
==16026== by 0x4EB3ACD: _IO_file_open (fileops.c:221)
==16026== by 0x4EB3D34: _IO_file_fopen@@GLIBC_2.2.5 (fileops.c:328)
==16026== by 0x4EA7D33: __fopen_internal (iofopen.c:86)
==16026== by 0x4009F1: OpenDataFiles (gcode.c:141)
==16026== by 0x4008BE: main (gcode.c:87)
==16026== Address 0x52042ba is 0 bytes after a block of size 10 alloc'd
==16026== at 0x4C2DBF6: malloc (vg_replace_malloc.c:299)
==16026== by 0x40098E: OpenDataFiles (gcode.c:131)
==16026== by 0x4008BE: main (gcode.c:87)
==16026==
==16026==
==16026== HEAP SUMMARY:
==16026== in use at exit: 0 bytes in 0 blocks
==16026== total heap usage: 34 allocs, 34 frees, 43,860 bytes allocated
==16026==
==16026== All heap blocks were freed -- no leaks are possible
==16026==
==16026== For counts of detected and suppressed errors, rerun with: -v
==16026== ERROR SUMMARY: 16 errors from 2 contexts (suppressed: 0 from 0)

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