usage.c

来自「CC386 is a general-purpose 32-bit C comp」· C语言 代码 · 共 78 行

/* 
Copyright 2002-2003 Free Software Foundation, Inc.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  

You may contact the author at:

mailto::[e-mail]

or by snail mail at:

David Lindauer
850 Washburn Ave Apt 99
Louisville, KY 40222
 */
/*
 * Display usage information and exit.
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include "cmdline.h"
/*
 * Main program must define the usage text
 */
extern char *usage_text;

/* Program banner */
void banner(char *fmt, ...)
{
    va_list argptr;

    putc('\n', stdout);

    va_start(argptr, fmt);
    vprintf(fmt, argptr);
    va_end(argptr);

    putc('\n', stdout);
}

/* Print usage info */
void usage(char *prog_name)
{
    char *short_name;
    char *extension;

    short_name = strrchr(prog_name, '\\');
    if (short_name == NULL)
        short_name = strrchr(prog_name, '/');
    if (short_name == NULL)
        short_name = strrchr(prog_name, ':');
    if (short_name)
        short_name++;
    else
        short_name = prog_name;

    extension = strrchr(short_name, '.');
    if (extension != NULL)
        *extension = '\0';
    printf("\nUsage: %s %s\n", short_name, usage_text);
    exit(1);
}