viewfile.c

这是一个在unix/linux下显示文本文件的程序

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curses.h>
void initial();
void echofile();
int line=0,titlenum=0;
int num=0,linenum=0;
int title[1000];
char ch;
char linebuf[1024];
FILE *fp;
main( int argc, char *argv[] )
{
	int j=0;
	char filename[256];
	memset( filename, 0, sizeof(filename) );
	memset( linebuf, 0, sizeof(linebuf) );
	if( argc == 1 )
	{
		printf("您的参数错误,正确用法: viewfile 文件名\n");
		return;
	}
	/*
	sprintf( filename, "%s/lht.txt", getenv("HOME") );
	*/
	sprintf( filename, "%s", argv[1] );

	fp = fopen( filename, "r" );
	if( fp == NULL )
	{
		printf("打开文件错误\n");
		return;
	}
	initial();
	while( !feof(fp) )
	{
		fgets( linebuf, 1024, fp );
		if( memcmp( linebuf, "-----", 5 ) == 0 )
		{
			title[num] = linenum;
			num++;
		}
		linenum ++;
	}
	line = 0;
	system( "clear" );
	fseek( fp, 0, SEEK_SET );
	echofile();
waiter:
	ch = getch();	
	switch( ch )
	{
		case 'U':
		case 'u':
			if( line == 0 )
				goto waiter;	
			else
			{
				if( titlenum != 0 )
					titlenum--;
				line = title[titlenum];
			}
			break;
		case 'D':
		case 'd':
			if( titlenum == num-1 )
			{
				goto waiter;
			}
			else
			{
				titlenum++;
				line = title[titlenum];
			}
			break;
		case 'P':
		case 'p':
			if( line < 20 )
			{
				line = 0;
				titlenum = 0;
			}
			else
			{
				line-=20-1;
				if( line < title[titlenum] )
				{
					if( titlenum > 0 )
						titlenum--;
				}
			}
			break;
		case 'N':
		case 'n':
			if( linenum - line < 20 )
			{
				goto waiter;
			}
			else
			{
				titlenum=0;
				if( line == 0 )
					line = 20;
				else
					line+=20-1;
				if( line > title[titlenum] )
				{
					if( titlenum != num-1 )
					{
						for( int i=0;i<num;i++ )
						{
							if( line >= title[i] )
								titlenum++;
						}
						if( line-title[num-1] < 0 )
						{
							titlenum--;
						}
					}
				}
			}
			break;
		case 'Q':
		case 'q':
			goto end;
		default:
			break;
	}
	echofile();
	goto waiter;
end:
	endwin();
	fclose( fp );
	system("clear");
}
void initial()
{
   initscr();
   cbreak();
   nonl();
   noecho();
   intrflush(stdscr,FALSE);
   keypad(stdscr,TRUE);
   refresh();
}
void echofile()
{
	int i=0;
	rewind( fp );
	for( i=0;i<20;i++ )
	{
		mvprintw( i+1,0,"                                                                                " );
	}
	i = 0;
	if( line!=0 || titlenum != 0 )
	{
		while( !feof(fp) )
		{
			fgets( linebuf, 1024, fp );
			if( i == line-2 )
			{
				break;
			}
			i++;		
		}
	}
	if( line == 0 || titlenum == 0 )
	{
		rewind( fp );
	}
	for( i=0;i<20;i++ )
	{
		memset( linebuf, 0, sizeof(linebuf) );
		fgets( linebuf, 1024, fp );
		mvprintw( i+1,0,"%s",linebuf );
	}
	/* 显示头 */
	attron(A_REVERSE); /* 开启反白模式 */
	memset( linebuf, 0, sizeof(linebuf) );
	mvprintw(0,10,"                                                                               ");
	sprintf( linebuf, "---  移植错误信息查询 [错误信息行数:%d]  ---     "
					  "[当前行数:%d]", linenum, line+1 );
	mvprintw(0,0,"%s",linebuf);
	attroff(A_REVERSE); /* 关闭反白模式 */
	mvprintw(1,0,"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");

	/* 显示尾 */
	mvprintw(22,0,"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
	attron(A_REVERSE); /* 开启反白模式 */
	mvprintw(23,0,"   U - 上一错误种类   D - 下一错误种类   P - 上翻一屏   N - 下翻一屏  Q - 退出");
	attroff(A_REVERSE); /* 关闭反白模式 */
}