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| 2 | <TITLE>Survex Hacker's Guide</TITLE> |
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| 6 | </STYLE> |
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| 7 | </HEAD><BODY BGCOLOR=white TEXT=black> |
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| 8 | <H1>Hacking Survex</H1> |
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| 9 | |
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| 10 | <p>(That's hacking in the "tinkering with code" sense, not in the |
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| 11 | "breaking into other people's computer systems" sense). |
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| 12 | |
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| 13 | <p>This is currently a random collection of notes that need to be written |
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| 14 | down while I remember. With time it should evolve into a more |
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| 15 | coherent document. If you have any questions which this should answer |
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| 16 | but doesn't then ask me and I'll add them. |
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| 17 | |
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| 18 | <H2>Network code debugging</H2> |
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| 19 | |
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| 20 | <P>You can pick which network simplifications are attempted using "-z" |
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| 21 | with an argument listing code letters. So: |
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| 22 | |
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| 23 | <ul> |
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| 24 | <li>-z= no special simplifications (articulation still performed) |
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| 25 | <li>-z=l remove "lollipops" |
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| 26 | <li>-z=p remove parallel legs |
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| 27 | <li>-z=d convert deltas to stars |
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| 28 | </ul> |
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| 29 | |
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| 30 | <P>And you can combine these in any combination: |
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| 31 | |
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| 32 | <ul> |
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| 33 | <li>-z=lp remove "lollipops" and parallel legs |
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| 34 | <li>-z=lpd remove "lollipops" and parallel legs; convert deltas to stars |
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| 35 | </ul> |
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| 36 | |
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| 37 | <P>"-z=lpd" is the default (in 0.99 at least - more transformations may |
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| 38 | conceivably be added in future, although the simple common cases are |
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| 39 | already covered). |
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| 40 | |
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| 41 | <H2>Developing on Unix Platforms</H2> |
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| 42 | |
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| 43 | <P>You'll need automake 1.5 or later (earlier versions don't support |
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| 44 | per-executable CFLAGS) and autoconf 2.50 or later (for AC_ARG_VAR). |
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| 45 | For building the documentation you'll need sgmltools 2 or later, |
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| 46 | docbook-to-man, and w3m. |
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| 47 | |
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| 48 | <H2>Building on Non-Unix Platforms</H2> |
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| 49 | |
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| 50 | <H3>DJGPP (MSDOS for 386 or better)</H3> |
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| 51 | |
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| 52 | <P>Currently I build this with a Linux hosted cross-compiler. I built |
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| 53 | this myself mostly following instructions from: |
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| 54 | |
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| 55 | <P><A |
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| 56 | HREF="http://www.objsw.com/CrossGCC/">http://www.objsw.com/CrossGCC/</A> |
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| 57 | |
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| 58 | <P>I suggest using binutils-2.10 rather than binutils-2.9.1. The newer version |
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| 59 | includes the patch they supply, so the instructions boil down to this |
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| 60 | sequence of commands: |
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| 61 | |
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| 62 | <pre> |
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| 63 | bash |
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| 64 | mkdir ~/djcross |
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| 65 | cd ~/djcross |
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| 66 | wget ftp://ftp.objsw.com/pub/crossgcc/build-djgpp.sh |
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| 67 | mkdir tars |
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| 68 | cd tars |
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| 69 | # can't get it to build with djcrx203 |
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| 70 | wget ftp://ftp.simtel.net/pub/simtelnet/gnu/djgpp/v2/old/djcrx202.zip |
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| 71 | # can't get 2.95.3 to build |
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| 72 | wget http://sunsite.org.uk/gnu/gcc/gcc-2.95.2.tar.gz |
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| 73 | # can't get 2.10.1 to build |
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| 74 | wget http://sunsite.org.uk/gnu/binutils/binutils-2.10.tar.gz |
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| 75 | cd .. |
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| 76 | patch -l build-djgpp.sh <<END |
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| 77 | 26c26 |
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| 78 | < binutils=binutils-2.9.1 |
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| 79 | --- |
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| 80 | > binutils=binutils-2.10 |
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| 81 | 97c97 |
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| 82 | < patch -p1 <\$patches/\$binutilsdiff |
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| 83 | --- |
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| 84 | > #patch -p1 <\$patches/\$binutilsdiff |
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| 85 | END |
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| 86 | sh build-djgpp.sh |
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| 87 | </pre> |
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| 88 | |
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| 89 | <P>Then you need to build and install the allegro graphics library: |
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| 90 | |
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| 91 | <P><A |
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| 92 | HREF="http://prdownloads.sourceforge.net/alleg/allegro-3.9.38.tar.gz" |
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| 93 | >http://prdownloads.sourceforge.net/alleg/allegro-3.9.38.tar.gz</A> |
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| 94 | |
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| 95 | <P>And follow the instructions for building using a cross-compiler is |
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| 96 | readme.dj. In 3.9.38 these boil down to this (the patch turns off use |
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| 97 | of sincos which isn't supported by djgpp 2.02 it seems - you may not |
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| 98 | need it, but it isn't harmful): |
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| 99 | |
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| 100 | <pre> |
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| 101 | cd allegro-3.9.38 |
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| 102 | ./fix.sh djgpp |
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| 103 | patch -p0 <<END |
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| 104 | --- src/rotate.c~ Thu Sep 13 20:33:59 2001 |
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| 105 | +++ src/rotate.c Fri Oct 5 11:29:55 2001 |
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| 106 | @@ -715,7 +715,7 @@ |
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| 107 | if (angle >= 0x800000) |
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| 108 | angle -= 0x1000000; |
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| 109 | |
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| 110 | - #ifdef ALLEGRO_DJGPP |
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| 111 | + #if 0 /*def ALLEGRO_DJGPP*/ |
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| 112 | /* Faster way to obtain both sin and cos with one call under djgpp. |
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| 113 | Todo: Do other platforms support this? (not watcom, mingw or msvc) |
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| 114 | */ |
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| 115 | END |
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| 116 | NATIVEPATH=$PATH |
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| 117 | export NATIVEPATH |
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| 118 | PATH=/opt/crosstools/i386-pc-msdosdjgpp/bin:/opt/crosstools/bin:$PATH |
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| 119 | DJDIR=/opt/crosstools/i386-pc-msdosdjgpp |
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| 120 | export DJDIR |
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| 121 | CROSSCOMPILE=1 |
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| 122 | export CROSSCOMPILE |
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| 123 | make |
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| 124 | make install |
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| 125 | PATH=$NATIVEPATH |
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| 126 | </pre> |
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| 127 | |
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| 128 | <P>Building Survex under DOS in a native djgpp environment will require |
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| 129 | some tinkering. Best bet is either to install bash and use the current |
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| 130 | configure script, or perhaps simpler to modify miniam.pl to generate a |
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| 131 | suitable makefile. I'm happy to help if you want to try this, and |
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| 132 | I'll incorporate patches provided they're fairly clean. |
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| 133 | |
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| 134 | <H3>Mingw (MS Windows)</H3> |
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| 135 | |
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| 136 | <P>Currently I build this with a Linux hosted cross-compiler. I use |
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| 137 | the packaged cross-compiler in the debian testing/unstable distribution. |
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| 138 | You can probably install these on other distributions using alien to |
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| 139 | convert them to RPMs or similar. Alternatively, before that |
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| 140 | I used to use pre-built binaries for gcc 2.95.2 obtained from: |
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| 141 | |
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| 142 | <P><A HREF="http://www.devolution.com/~slouken/SDL/Xmingw32/" |
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| 143 | >http://www.devolution.com/~slouken/SDL/Xmingw32/</A> |
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| 144 | |
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| 145 | <P>Building on Windows in a native mingw environment will probably |
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| 146 | require tinkering. Best bet is probably to install bash and use the |
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| 147 | current configure script. I'm happy to help if you want to try this, |
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| 148 | and I'll incorporate patches provided they're fairly clean. |
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| 149 | |
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| 150 | <P>Building on Windows with MSVC/BorlandC/Watcom/... is likely to be more |
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| 151 | work, but could be a worthwhile project. I'd suggest patching the |
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| 152 | perl script miniam.pl to generate a suitable makefile. Again, send |
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| 153 | patches if you get this to work. |
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| 154 | |
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| 155 | <H3>MSDOS for 286 and earlier (BorlandC)</H3> |
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| 156 | |
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| 157 | <P>Wookey currently builds this with a rather elderly BorlandC++ 3.1. |
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| 158 | BorlandC++ 5.5 can be downloaded for free, but it appears to only compile to |
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| 159 | 32 bit code. You can also download TurboC version 2, which might do the job |
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| 160 | (I've not tried yet). |
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| 161 | |
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| 162 | <P>You can build a suitable source archive for this version using |
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| 163 | `make alien_src_zip' on the source distribution on a Unix box (you need to |
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| 164 | have run `./configure' first). |
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| 165 | |
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| 166 | <H3>RISC OS</H3> |
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| 167 | |
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| 168 | <P>We now build this with Acorn C V5. It will probably still build with |
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| 169 | Acorn C V4. You also need to get and install OSLib from: |
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| 170 | |
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| 171 | <P><A HREF="http://www.arcade.demon.co.uk/oslib/homepage.html" |
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| 172 | >http://www.arcade.demon.co.uk/oslib/homepage.html</A> |
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| 173 | |
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| 174 | <P>You can build a suitable source archive for compiling the RISC OS version by |
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| 175 | running `make alien_src_zip' on the source distribution on a Unix box (you |
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| 176 | need to have run `./configure' first). However for this you'll need a |
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| 177 | specially tweaked version of zip to create the zip file with the correct |
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| 178 | RISC OS file types. I can supply this on request. You need to put it in the |
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| 179 | top level of the source tree and call it `zip-magic'. |
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| 180 | |
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| 181 | <P>You'll probably need to use Acorn's Make Utility (`amu') to build - the GNU |
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| 182 | make 1.02 port doesn't seem up to the job. |
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| 183 | |
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| 184 | <P>To build, create a fresh directory (or empty one) and unpack the contents of |
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| 185 | srcN_NN.zip into it (using !SparkFS or similar). Then double-click on |
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| 186 | `!ObeyMe' in the unpacked directory to rename the source files into c and h |
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| 187 | subdirectories. Then double-click on `!MakeMe' to build survex. |
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| 188 | |
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| 189 | |
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| 190 | <H2>SURVEXHOME environmental variable</H2> |
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| 191 | |
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| 192 | <P>Survex needs various support files. Under UNIX the path to the |
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| 193 | support files needs to be built into the programs, but this causes a |
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| 194 | problem if the support files need to be installed elsewhere for some |
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| 195 | reason and the programs can't be rebuilt. To get around this problem, |
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| 196 | you can define an environmental variable SURVEXHOME to point to a |
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| 197 | directory in which to look for support files. |
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| 198 | |
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| 199 | <P>This mechanism may sometimes useful on other operating systems. |
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| 200 | |
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| 201 | <P>Under UNIX, use "setenv SURVEXHOME /home/user/survex" (csh) |
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| 202 | or "SURVEXHOME=/home/user/survex ; export SURVEXHOME" (sh). |
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| 203 | |
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| 204 | <P>For DOS, put SET SURVEXHOME=C:\SURVEX in your AUTOEXEC.BAT file |
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| 205 | |
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| 206 | <P>For RISC OS put *Set SURVEXHOME ADFS::4.$.Survex.!Survex into your |
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| 207 | Boot !Run or !DeskTop |
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| 208 | |
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| 209 | </BODY></HTML> |
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