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-.TH GETFLAGS 3
-.CT 2 data_man
-.SH NAME
-getflags \(mi process flag arguments in argv
-.SH SYNOPSIS
-.nf
-#include </usr/include/getflags.h>
-.PP
-.B int getflags(argc, argv, flags)
-.B char **argv, *flags;
-.PP
-.B usage(tail)
-.B char *tail;
-.PP
-.B extern char **flag[], cmdline[], *cmdname, *flagset[];
-.fi
-.SH DESCRIPTION
-.I Getflags
-digests an argument vector
-.IR argv ,
-finding flag arguments listed in
-.IR flags .
-.I Flags
-is a string of flag letters.
-A letter followed by a colon and a number
-is expected to have the given number of parameters.
-A flag argument starts with
-.RB ` - '
-and is followed by any number of flag letters.
-A flag with one or more parameters must be the last flag in an argument.
-If any characters follow it, they are the flag's first parameter.  Otherwise
-the following argument is the first parameter.  Subsequent parameters are taken
-from subsequent arguments.
-.PP
-The global array
-.I flag
-is set to point to an array of parameters for each flag found.
-Thus, if flag
-.B -x
-was seen,
-.B flag['x']
-is non-zero, and
-.B flag['x'][i]
-is the flag's
-.IR i th
-parameter.
-If flag
-.B -x
-has no parameters
-.BR flag['x']==flagset .
-Flags not found
-are marked with a zero.
-Flags and their parameters are deleted from
-.I argv.
-.I Getflags
-returns the adjusted argument count.
-.PP
-.I Getflags
-stops scanning for flags upon encountering a non-flag argument,
-or an argument whose only character is
-.RB ` - ',
-which argument is deleted.
-.PP
-.I Getflags
-places a pointer to 
-.I argv[0]
-in the external variable
-.I cmdname.
-It also concatenates the original members of
-.IR argv ,
-separated by spaces, and places the result in the external array
-.IR cmdline .
-.PP
-.I Usage
-constructs a usage message, prints it on the standard error file,
-and exits with status 1.
-The command name printed is
-.IR argv[0] .
-Appropriate flag usage syntax is generated from
-.IR flags .
-As an aid,
-explanatory information about flag parameters may be included in
-.I flags
-in square brackets as in the example.
-.I Tail
-is printed at the end of the message.
-If
-.I getflags
-encountered an error,
-.I usage
-tries to indicate the cause.
-.SH EXAMPLES
-.EX
-	main(argc, argv)
-	char *argv[];
-	{
-		if((argc=getflags(argc, argv, "vinclbhse:1[expr]", 1))==-1)
-			usage("[file ...]");
-	}
-.EE
-might print:
-.EX
-	Illegal flag -u
-	Usage: grep [-vinclbhs] [-e expr] [file ...]
-.EE
-.SH "SEE ALSO"
-.IR getopt (3)
-.SH DIAGNOSTICS
-.I Getflags
-returns \-1 on error:
-a syntax error in
-.I flags,
-setting a flag more than once, setting a flag not mentioned
-in
-.IR flags ,
-or running out of argv while collecting a flag's parameters.