void do_more(FILE *fp)
{
char line[LINELEN];
char toPrint[PRINT];
int num_of_lines = 0;
int pagePercent;
int reply;
int linesDisplayed = 0;
FILE *fp_tty;
fp_tty = fopen("/dev/tty", "r");
if(fp_tty == NULL)
ctrl_c();
while(fgets(line, LINELEN, fp))
{
if(num_of_lines == PAGELEN){
pagePercent = (linesDisplayed * PERCENT) / numLines;
if(linesDisplayed == PAGELEN){
sprintf(toPrint, "%s %%%d", fileName, pagePercent);
reply = see_more(fp_tty, toPrint);
}
if(linesDisplayed > PAGELEN){
sprintf(toPrint, "%%%d", pagePercent);
reply = see_more(fp_tty, toPrint);
}
if(reply == 0)
break;
num_of_lines -= reply;
}
if(fputs(line, stdout) == EOF)
ctrl_c();
num_of_lines++;
linesDisplayed++;
}
}
void do_more( FILE *fp )
/*
* read PAGELEN lines, then call see_more() for further instructions
*/
{
char line[LINELEN];
int num_of_lines = 0;
int reply;
FILE *fp_tty;
fp_tty = fopen( "/dev/tty", "r" ); /* NEW: cmd stream */
if ( fp_tty == NULL ) /* if open fails */
exit(1); /* no use in running */
while ( fgets( line, LINELEN, fp ) ){ /* more input */
if ( num_of_lines == PAGELEN ) { /* full screen? */
reply = see_more(fp_tty); /* NEW: pass FILE * */
if ( reply == 0 ) /* n: done */
break;
num_of_lines -= reply; /* reset count */
}
if ( fputs( line, stdout ) == EOF ) /* show line */
exit(1); /* or die */
num_of_lines++; /* count it */
}
}
/*
* read PAGELEN lines, then call see_more() for further instructions
*/
void
do_more(FILE *fp)
{
char line[LINELEN];
int num_of_lines = 0;
int reply;
FILE *fp_tty;
fp_tty = fopen("/dev/tty", "r"); /* cmd stream */
if (fp_tty == NULL) {
perror("fopen() /dev/tty failed:");
exit(EXIT_FAILURE);
}
while (fgets(line, LINELEN, fp)) {
if (num_of_lines == PAGELEN) { /* full screen? */
reply = see_more(fp_tty); /* y: ask user */
if (reply == 0) /* n: done */
break;
num_of_lines -= reply; /* reset count */
}
if (fputs(line, stdout) == EOF) /* show line */
exit(EXIT_FAILURE); /* or die */
num_of_lines++; /* count it */
}
}
void
do_more(FILE *fp){
char line[COL];
int num_of_lines = 0;
int see_more(FILE *),reply;
FILE * fp_tty;
fp_tty = fopen("/dev/tty","r");
if (fp_tty == NULL)
exit(1);
while(fgets(line,COL, fp)){
if (num_of_lines == ROW){
reply = see_more(fp_tty);
if (reply == 0)
{
printf("\n");
break;
}
num_of_lines -= reply;
}//if
MOVE_TO_DOWN_LEFT_CORNER();
CLEAN_LINE();
if (fputs(line, stdout) == EOF)
exit(1);
num_of_lines++;
}//while
}
void do_more(FILE *fp)
/*
* read PAGELEN lines, then call see_more() for further instructions
*/
{
char line[LINELEN];
int num_of_lines = 0;
int see_more(), reply;
while (fgets(line, LINELEN, fp)) { /* more input */
if (num_of_lines == PAGELEN) { /* full screen? 第一次进入时，显然不会执行了。 */
reply = see_more(); /* y: ask user */
if (reply == 0) /* n: done */
break;
num_of_lines -= reply; /* reset count */
// <--- 如果让你设计这个计数量 num_of_lines ，你会怎样做呢？
// 我感觉这里的做法很好，num_of_lines 相当于一个游标，其满盈由 reply 变量
// 进行控制。
}
if (fputs(line, stdout) == EOF) /* show line */
exit(1); /* or die */
num_of_lines++; /* count it */
// <--- 看代码的方法，比如这里 num_of_lines 在 52 行看到时，可能还有些纳闷，因为在此之前没有地方
// 会改变它的值。不要怀疑基本的逻辑，它一定会在后面的某个部位被修改，否则上面的这个条件永远无法
// 进入。
}
}
/* read PAGELEN lines */
void do_more(FILE *fp)
{
char line[LINELEN];
int num_of_lines = 0;
int see_more(FILE *), reply;
FILE *fp_tty;
fp_tty = fopen("/dev/tty","r");
if (fp_tty == NULL)
exit(1);
struct termios org_opts, new_opts;
tcgetattr(STDIN_FILENO, &org_opts);
memcpy(&new_opts, &org_opts, sizeof(new_opts));
new_opts.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &new_opts);
while (fgets(line, LINELEN, fp))
{
if (num_of_lines == PAGELEN)
{
reply = see_more(fp_tty); // user want some more
if (reply == 0)
break;
num_of_lines -= reply;
}
if (fputs(line, stdout) == EOF)
exit(1);
num_of_lines++;
}
tcsetattr(STDIN_FILENO, TCSANOW, &org_opts);
}
void do_more(FILE* fp)
{
char line[ LINELEN ];
int num_of_lines = 0;
int reply;
while ( fgets( line, LINELEN, fp ) )
{
if ( num_of_lines == PAGLINE )
{
reply = see_more();
if ( reply == 0 )
break;
num_of_lines -= reply;
}
if ( fputs( line, stdout ) == EOF )
{
exit( 1 );
}
num_of_lines++;
}
}
void do_more(FILE* fp)
{
char line[MAXLINELEN];
int lineNum, reply;
FILE* fp_tty;
fp_tty = fopen("/dev/tty", "r");
if (fp_tty == NULL)
{
exit(1);
}
lineNum = 0;
while((fgets(line, MAXLINELEN, fp)) != NULL)
{
if (lineNum == PAGELEN - 1)
{
reply = see_more(fp_tty);
if (reply == -1)
{
return;
}
lineNum -= reply;
}
fputs(line, stdout);
++lineNum;
}
}
void do_more(FILE *fp)
/*
读取PAGELEN行的文本，接着调用see_more()函数进行下一步的指令
*/
{
char line[LINELEN];
int num_of_lines = 0;
int see_more(FILE *),reply;
FILE *fp_tty;
fp_tty = fopen("/dev/tty","r"); //NEW：cmd流
if(fp_tty == NULL) //如果打开失败
exit(1);
while(fgets(line,LINELEN,fp)) //more输出
{
if(num_of_lines == PAGELEN)
{
reply = see_more(fp_tty); //NEW:传递FILE*
if(reply == 0) //完成
break;
num_of_lines -= reply; //重新计数
}
if(fputs(line,stdout) == EOF) //显示一行
exit(1); //或退程序
num_of_lines++; //计数
}
}
/*
* read PAGELEN lines, then call see_more() for further instructions
*/
void do_more(FILE *fp)
{
char line[LINELEN];
int num_of_lines = 0;
int see_more(), reply;
while ( fgets( line, LINELEN, fp) ) { /* more input */
if ( num_of_lines == PAGELEN ) { /*full screen? */
reply = see_more(); /*y: ask user */
if (reply == 0 ) /*n: done */
break;
num_of_lines -= reply; /* reset count */
}
if ( fputs( line, stdout ) == EOF ) /* show line */
exit(1); /* or die */
num_of_lines++; /* count it */
}
}
void do_more(FILE * fp)
{
char line[LINELEN];
int reply;
int num_of_lines = 0;
FILE * fp_tty ;
struct winsize size;
struct termios term,save_term;
struct stat buf;
if((fp_tty = fopen("/dev/tty","r")) == NULL)
exit(1);
/*获取终端屏幕大小*/
if(ioctl(fileno(fp_tty),TIOCGWINSZ,&size) == -1)
perror("get term size failed \n");
PAGELEN = size.ws_row;
/*获取文件大小*/
if(fstat(fileno(fp),&buf) < 0)
perror("get file stat failed\n");
file_size = buf.st_size;
/* 改变终端的属性为无回显按下q 或 ' ' 无需再按Enter即可执行*/
if(tcgetattr(fileno(fp_tty),&term) < 0)
perror("tcgetattr failed\n");
save_term = term;
term.c_lflag &= ~( ECHO | ICANON);
if(tcsetattr(fileno(fp_tty),TCSANOW,&term) < 0)
perror("tcsetattr failed\n");
while(fgets(line,LINELEN,fp))
{
file_pos = ftello(fp); //得到当前位置
if(num_of_lines == PAGELEN)
{
reply = see_more(fp_tty);
if(reply == 0)
{
break;
}
num_of_lines -= reply;
}
if(fputs(line,stdout) == EOF)
exit(1);
num_of_lines++;
}
if(tcsetattr(fileno(fp_tty),TCSANOW,&save_term) < 0) //设置终端属性
perror("restore from save_term failed \n");
}
void do_more(FILE *fp){
char line[LINELEN];
int num_of_lines = 0;
int reply;
FILE *fp_tty = fopen("/dev/tty", "r");
if(fp_tty == NULL)
exit(1);
while(fgets(line, LINELEN, fp)){ /* read in one line */
if(num_of_lines == PAGELEN){ /* if the screen is full */
reply = see_more(fp_tty); /* ask user */
if(reply == 0)
break;
num_of_lines -= reply;
}
if(fputs(line, stdout) == EOF) /* show one line */
exit(1);
num_of_lines++;
}
}
// 先打印行数：当行数达到 PAGELEN 时调用 see_more 函数处理命令；当输出到 stdout
// 时发现 EOF, 自然终止。
extern void do_more(FILE *fp, FILE *fp_tty) {
char line[LINELEN];
int num_of_lines = 0;
int reply;
while (fgets(line, LINELEN, fp)) {
if (num_of_lines == PAGELEN) {
reply = see_more(fp_tty);
if (reply == 0) {
exit(EXIT_SUCCESS);
}
num_of_lines -= reply;
}
if (fputs(line, stdout) == EOF) {
printf("No more lines.\n");
exit(EXIT_SUCCESS);
}
++num_of_lines;
}
}
void b_more(
FILE * fp /*The file to print*/
)
{
char line[LINELEN]; /* Text Buffer */
int num_of_lines = 0; /* Count of the lines printed*/
int reply; /* The reply of user*/
while (fgets(line, LINELEN, fp))
{
if (num_of_lines == PAGELEN)
{
reply = see_more();
if (reply == 0)
break;
num_of_lines -= reply;
}
if (fputs(line, stdout) == EOF)
return;
num_of_lines++;
}
}
/*
* read 24 lines, then call see_more() for further instructions
*/
void
do_more(FILE* fp){
char line[512];
int num_of_lines = 0;
//int see_more();
int reply;
FILE* fp_tty = fopen("/dev/tty","r");
if(fp_tty == NULL)
exit(1);
while (fgets(line,512,fp)){ /*more input*/
if(num_of_lines == 24) { /*full screen? 此时才接收用户的输入*/
reply = see_more(fp_tty); /*ask user*/
if (reply == 0) /*done*/
break;
num_of_lines -= reply; /*reset count*/
}
if(fputs(line,stdout) == EOF){ /*show line*/
exit(1);
}
num_of_lines++;
}
}
void do_more(FILE * fp)
{
char line[LINELEN];
int num_of_lines = 0;
int see_more(FILE*), reply;
FILE *fp_tty;
fp_tty = fopen("/dev/tty", "r");
if ( fp_tty == NULL )
exit(EXIT_FAILURE);
while ( fgets(line, LINELEN, fp) ) {
if (num_of_lines == PAGELEN) {
reply = see_more(fp_tty);
if (reply == 0)
break;
num_of_lines -= reply;
}
if (fputs(line, stdout) == EOF)
exit(EXIT_FAILURE);
num_of_lines++;
}
}
void do_more(FILE *fp){
char line[LINELEN];
int num_of_line=0;
int see_more(FILE*),reply;
FILE* tty = fopen("/dev/tty","r");
if(tty==NULL){
exit(1);
}
while(fgets(line,LINELEN,fp)){
if(num_of_line==PAGELEN){
reply=see_more(tty);
if(reply == 0)
break;
num_of_line-=reply;
}
if(fputs(line,stdout)==EOF)
exit(1);
num_of_line++;
}
fclose(tty);
}
