Vim Usage

/*============================================================================ Name        : Exercise.cpp Author      : Haier Version     : 1.01 Copyright   : Copyright (c) 2014 Description : Vim Usage in C, Ansi-style, Compile by Eclipse ============================================================================*/#include <stdio.h>typedef unsigned char char_u; static void usage(int n){    register int i;    static char_u *(use[]) = {(char_u *)"[file ..]\n",                              (char_u *)"-t tag\n",                              (char_u *)"-e [errorfile]\n"                             };    static char_u *(errors[]) =  {(char_u *)"Unknown option\n",/* 0 */                                  (char_u *)"Too many arguments\n",/* 1 */                                  (char_u *)"Argument missing\n",/* 2 */                                 };    fprintf(stderr, (char *)errors[n]);    fprintf(stderr, "usage:");    for (i = 0; ; ++i)    {        fprintf(stderr, " vim [options] ");        fprintf(stderr, (char *)use[i]);        if (i == (sizeof(use) / sizeof(char_u *)) - 1)            break;        fprintf(stderr, "   or:");    }    fprintf(stderr, "\noptions:\t-v\t\treadonly mode (view)\n");    fprintf(stderr, "\t\t-n\t\tno swap file, use memory only\n");    fprintf(stderr, "\t\t-b\t\tbinary mode\n");    fprintf(stderr, "\t\t-r\t\trecovery mode\n");#ifdef AMIGA  //高分辨率，快速用户响应接口    fprintf(stderr, "\t\t-x\t\tdon't use newcli to open window\n");    fprintf(stderr, "\t\t-d device\tuse device for I/O\n");#endif    fprintf(stderr, "\t\t-T terminal\tset terminal type\n");    fprintf(stderr, "\t\t-o[N]\t\topen N windows (def: one for each file)\n");    fprintf(stderr, "\t\t+\t\tstart at end of file\n");    fprintf(stderr, "\t\t+lnum\t\tstart at line lnum\n");    fprintf(stderr, "\t\t-c command\texecute command first\n");    fprintf(stderr, "\t\t-s scriptin\tread commands from script file\n");    fprintf(stderr, "\t\t-w scriptout\twrite commands in script file\n");}int main(){usage(2);return 0;}