From b35e9606846636b7505efb078b16f34deb42f961 Mon Sep 17 00:00:00 2001
From: bnewbold <bnewbold@robocracy.org>
Date: Sun, 26 Jun 2011 14:53:31 -0400
Subject: old c notes

---
 software/c.page | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 software/c.page

diff --git a/software/c.page b/software/c.page
new file mode 100644
index 0000000..910a5de
--- /dev/null
+++ b/software/c.page
@@ -0,0 +1,44 @@
+
+C Programming Language
+=======================
+
+K&R Notes (unstructured)
+-----------------------------
+
+With pointer arithmatic, the type of ``foo *p`` is taken into account
+automagically. Eg, ``p+3`` -> ``0xFEFE0000 + 3 * (sizeof foo)``.
+
+Examples of tricky pointer sytax::
+
+  int *ip;  
+  (++*p)
+  (*p++)
+  ++(*p)
+  *(++p)
+
+In the context of references like function declarations, only the size of the
+first dimension of a multi-dimensional array is free; the others must be
+specified explicitly::
+
+  void copy_2d_array(int a[][10], int b[][10]); // Ok
+  void copy_2d_array(int a[][],   int b[][]);   // Invalid
+  void copy_2d_array(int a[10][], int b[10][]); // Invalid
+
+Negative indexing of arrays is "allowed" (reads ahead of the array in memory);
+need to check for that case explicitly.
+
+``_FORTIFY_SOURCE`` does what it says. 
+
+In C99 can ``int* p`` replace ``int *p``? Seems like yes. 
+
+The "update statement" of a for loop gets executed at the /end/ of every loop,
+which means an iteration variable gets updated once more than might be
+expected::
+
+  int i;
+  for(i = 0; i < 10; i++) { 
+    } 
+  printf("%d\n", i); // prints 10, not 9
+
+Any 'inline' should probably be 'static' (local linkage). 
+
-- 
cgit v1.2.3