xgamma: Changes to 'master'

[Alan Coopersmith]

 configure.ac   |    2 -
 man/xgamma.man |    6 +++-
 xgamma.c       |   77 ++++++++++++++++++++++++++++++++++-----------------------
 3 files changed, 53 insertions(+), 32 deletions(-)

New commits:
commit 4b5048012f1197400c98d58f2234ba674099174b
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Sat May 24 10:34:23 2014 -0700

    Add -version option to print program version
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

commit 5a4e873be460f96629f574c7e127ad3868f7c7e4
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Sat May 24 10:27:44 2014 -0700

    Print which option was in error along with usage message
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

commit 3643c69e12c2294f5eafae06d10ce7f76c5daad9
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Sat May 24 10:16:40 2014 -0700

    Combine usage message fprintfs into a single call
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

commit 3a0e14080f81fbfb7b2df2fc8a775b2dc8506cb3
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Sat May 24 10:10:54 2014 -0700

    Fix const char warnings in calls to isabbreviation()
    
    gcc warned on every call:
    
    xgamma.c: In function ‘main’:
    xgamma.c:107:6: warning: passing argument 1 of ‘isabbreviation’ discards
     ‘const’ qualifier from pointer target type [enabled by default]
          if (isabbreviation ("-display", arg, 1)) {
          ^
    xgamma.c:70:1: note: expected ‘char *’ but argument is of type ‘const char *’
     isabbreviation(char *arg, char *s, size_t minslen)
     ^
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

commit cab5c584f1dcc125a7fd2a014785dc8adcd3c683
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Sat May 24 10:09:22 2014 -0700

    Fix size/sign conversion warnings in isabbreviation()
    
    clang said:
    xgamma.c:85:26: warning: implicit conversion changes signedness: 'int' to
          'size_t' (aka 'unsigned long') [-Wsign-conversion]
        if (strncmp (arg, s, slen) == 0) return (True);
            ~~~~~~~          ^~~~
    xgamma.c:78:14: warning: implicit conversion loses integer precision: 'size_t'
          (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
        arglen = strlen (arg);
               ~ ^~~~~~~~~~~~
    xgamma.c:79:12: warning: implicit conversion loses integer precision: 'size_t'
          (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
        slen = strlen (s);
             ~ ^~~~~~~~~~
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

commit 3d05b29e9e1431f11cb2c2cb960380586c6ba494
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Sat May 24 10:06:37 2014 -0700

    Add noreturn attribute to Syntax function
    
    Suggested by clang:
    xgamma.c:48:1: warning: function 'Syntax' could be declared with attribute
          'noreturn' [-Wmissing-noreturn]
    {
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>