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/*********************************************************************
Example source code for using the argtable2 library to implement:
echo [-neE] [--help] [--version] [STRING]...
This file is part of the argtable2 library.
Copyright (C) 1998-2001,2003-2011 Stewart Heitmann
sheitmann@users.sourceforge.net
The argtable2 library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This software is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
**********************************************************************/
#include "argtable2.h"
/* Here we only approximate the echo functionality */
void mymain(int n, int e, int E, const char** strings, int nstrings)
{
int j;
printf("option -n = %s\n", ((n)?"YES":"NO"));
printf("option -e = %s\n", ((e)?"YES":"NO"));
printf("option -E = %s\n", ((E)?"YES":"NO"));
for (j=0; j<nstrings; j++)
printf("%s ", strings[j]);
printf("\n");
}
int main(int argc, char **argv)
{
/* Define the allowable command line options, collecting them in argtable[] */
struct arg_lit *n = arg_lit0("n", NULL, "do not output the trailing newline");
struct arg_lit *e = arg_lit0("e", NULL, "enable interpretation of the backslash-escaped characters listed below");
struct arg_lit *E = arg_lit0("E", NULL, "disable interpretation of those sequences in <string>s");
struct arg_lit *help = arg_lit0(NULL,"help", "print this help and exit");
struct arg_lit *vers = arg_lit0(NULL,"version", "print version information and exit");
struct arg_str *strs = arg_strn(NULL,NULL,"STRING",0,argc+2,NULL);
struct arg_end *end = arg_end(20);
void* argtable[] = {n,e,E,help,vers,strs,end};
const char* progname = "echo";
int exitcode=0;
int nerrors;
/* verify the argtable[] entries were allocated sucessfully */
if (arg_nullcheck(argtable) != 0)
{
/* NULL entries were detected, some allocations must have failed */
printf("%s: insufficient memory\n",progname);
exitcode=1;
goto exit;
}
/* Parse the command line as defined by argtable[] */
nerrors = arg_parse(argc,argv,argtable);
/* special case: '--help' takes precedence over error reporting */
if (help->count > 0)
{
printf("Usage: %s", progname);
arg_print_syntax(stdout,argtable,"\n");
printf("Echo the STRINGs to standard output.\n\n");
arg_print_glossary(stdout,argtable," %-10s %s\n");
printf("\nWithout -E, the following sequences are recognized and interpolated:\n\n"
" \\NNN the character whose ASCII code is NNN (octal)\n"
" \\\\ backslash\n"
" \\a alert (BEL)\n"
" \\b backspace\n"
" \\c suppress trailing newline\n"
" \\f form feed\n"
" \\n new line\n"
" \\r carriage return\n"
" \\t horizontal tab\n"
" \\v vertical tab\n\n"
"Report bugs to <foo@bar>.\n");
exitcode=0;
goto exit;
}
/* special case: '--version' takes precedence error reporting */
if (vers->count > 0)
{
printf("'%s' example program for the \"argtable\" command line argument parser.\n",progname);
printf("September 2003, Stewart Heitmann\n");
exitcode=0;
goto exit;
}
/* If the parser returned any errors then display them and exit */
if (nerrors > 0)
{
/* Display the error details contained in the arg_end struct.*/
arg_print_errors(stdout,end,progname);
printf("Try '%s --help' for more information.\n",progname);
exitcode=1;
goto exit;
}
/* Command line parsing is complete, do the main processing */
mymain(n->count, e->count, E->count, strs->sval, strs->count);
exit:
/* deallocate each non-null entry in argtable[] */
arg_freetable(argtable,sizeof(argtable)/sizeof(argtable[0]));
return exitcode;
}
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