move getopt_long() example to src repo

Author: Vladimir Kotal

intro.tex

@@ -2243,13 +2243,13 @@
 int \funnm{getopt\_long}(\=int \emph{argc}, char * const \emph{argv}[],\\
 \>const char *\emph{optstring},\\
 \>const struct option *\emph{longopts},\\
-\>int *\emph{longindex}); 
+\>int *\emph{longindex});
 \end{tabbing}}
 ]]])
 \begin{itemize}
 \item \texttt{optstring} contains short options,
 \texttt{longopts} contains the address of an array of structures for long options
-(last record contains all zeroes) 
+(last record contains all zeroes)
 \item if the function hits a long option, it returns the corresponding
 \texttt{val} or zero (if \texttt{flag} was not \texttt{NULL}),
 otherwise the behavior is the same as \texttt{getopt}.
@@ -2259,47 +2259,7 @@
 \end{slide}
 
 \begin{itemize}
-\item This is slightly modified example from the \texttt{getopt\_long}
-FreeBSD man page:
-ifdef([[[NOSPELLCHECK]]], [[[
-{\footnotesize
-\begin{verbatim}
-#include <stdio.h>
-#include <getopt.h>
-#include <fcntl.h>
-
-int ch, fd, daggerset, bflag = 0;
-
-static struct option longopts[] = {
-       { "buffy",      no_argument,            NULL,           'b' },
-       { "fluoride",   required_argument,      NULL,           'f' },
-       { "daggerset",  no_argument,            &daggerset,     1 },
-       { NULL,         0,                      NULL,           0 }};
-
-int main(int argc, char **argv)
-{
-  while ((ch = getopt_long(argc, argv, "bf:", longopts, NULL)) != -1)
-         switch (ch) {
-         case 'b':
-                 bflag = 1; break;
-         case 'f':
-                 if ((fd = open(optarg, O_RDONLY, 0)) == -1)
-                         printf("unable to open %s", optarg);
-                 break;
-         case 0:
-                 if (daggerset) {
-                         printf("Buffy will use her dagger to "
-                             "apply fluoride to dracula's teeth\n");
-                 }
-                 break;
-         default: printf("usage: ...\n");
-  }
-  argc -= optind; argv += optind;
-  return 0;
-}
-\end{verbatim}
-]]])
-}
+\item See \example{getopt/getopt\_long.c}
 \end{itemize}
 
 %%%%%