[Ltrace-devel] [PATCH] arrays, structs, flexible return value sizes, alt config files, et al

[Steve Fink]

Long ago, I submitted the initial piece of this patch and got no
reply, so I'm not going to go to the effort of chopping it up into
reasonable-sized pieces unless there's some interest in including it.

This patch contains my accumulated changes. It's a big pile of related
stuff that enables me to get readable output for things like OpenGL
call tracing. I just rediffed it against 0.4, and the pain of that
incented me to try submitting again (looks like the code has all gone
through 'indent -kr'; that, and some space/tab stuff made sure that
the synchronization was painful.)

I'm attaching two patches, largely because of the space/tab
mismatches: one that applies cleanly to the 0.4 sources, and another
whitespace-ignoring version that should be more human-readable.

The changes are:

Command line
 - -A option for specifying max number of array elements to print
 - -F option for loading in an alternate config file

Configuration
 - ltrace will load ~/.ltrace.conf (if present) in addition to /etc/ltrace.conf

Argument handling
 - 'short' and 'unsigned short' arguments
 - 'float' and 'double' arguments
 - pointers to various data types
 - struct arguments (usually passed as pointers)
 - fixed- and variable-length arrays (usually passed as pointers)
 - any argument can be used for the size of a returned string
   - rather than string3, you can now use string[3] (or any other
argument index)
   - same for array lengths
 - arguments can be ignored with the 'ignore' parameter type
 - enumerated types (example output: glMatrixMode(GL_MODELVIEW))
 - typedefs (necessary for sanity when writing configs using structs and enums)
 - all of this is documented in /etc/ltrace.conf

Nuisance
 - a number of formatting changes slipped in
when I incorporated version 0.4.
 - I'm guessing that the new argument types will cause portability
problems. See align_struct for my simplistic attempt at dealing with
the one issue I thought of. We could always just disable fancy
arguments on all architectures until they pass tests... :-)
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