// This is same as inputc except it honors the ontimeout handler
// and calls it when needed. For the callee, there is no difference
// as this will not return unless a key has been pressed.
char getch(char *scan)
{
unsigned long i;
TIMEOUTCODE c;
// Wait until keypress if no handler specified
if (ms->ontimeout==NULL) return inputc(scan);
while (1) // Forever do
{
for (i=0; i < ms->tm_numsteps; i++)
{
if (checkkbdbuf()) return inputc(scan);
sleep(ms->tm_stepsize);
}
c = ms->ontimeout();
switch(c)
{
case CODE_ENTER: // Pretend user hit enter
*scan = ENTERA;
return '\015'; // \015 octal = 13
case CODE_ESCAPE: // Pretend user hit escape
*scan = ESCAPE;
return '\033'; // \033 octal = 27
default:
break;
}
}
return 0;
}
int
inputline(void)
{
int i, c, start;
/*
* Could set linep = line and i = 0 here and just
* error(Etoolong) below, but this way we keep
* old input buffer history around for a while.
* This is useful only for debugging.
*/
i = linep - line;
do{
if((c = inputc())<=0)
return -1;
if(i == nelem(line)-1){
if(linep == line)
error(Etoolong);
start = linep - line;
runemove(line, linep, i-start);
i -= start;
linep = line;
}
}while((line[i++]=c) != '\n');
line[i] = 0;
return 1;
}
int
inputline(void)
{
int i, c;
linep = line;
i = 0;
do{
if((c = inputc())<=0)
return -1;
if(i == (sizeof line)/RUNESIZE-1)
error(Etoolong);
}while((line[i++]=c) != '\n');
line[i] = 0;
return 1;
}
int main()//主函数
{
int i;
start:
printf("\n\t\t\t欢迎使用学生选课系统!\n");
printf("菜单:\n");
printf("1.录入课程信息\n");
printf("2.课程管理\n");
printf("3.录入学生信息\n");
printf("4.学生信息管理\n");
printf("5.学生选课\n");
printf("6.退出系统\n");
printf("\n请输入菜单选项(1~6):\n");
scanf("%d",&i);
if(i<1 || i>6)
{
printf("输入错误,请重输:\n");
goto start;
}
switch(i)
{
case(1):
{
system("cls");
inputc();
goto start;
break;
}
case(2):
{
system("cls");
managementc();
goto start;
break;
}
case(3):
{
system("cls");
inputs();
goto start;
break;
}
case(4):
{
system("cls");
managements();
goto start;
break;
}
case(5):
{
system("cls");
elective();
goto start;
break;
}
case(6):
{
system("cls");
printf("感谢使用本系统!\n\n再见!\n");
}
}
return(0);
}
void showhelp(const char *filename)
{
char nc,nr,ph;
char *title,*text;
union { char *buffer; void *vbuf; } buf; // This is to avoild type-punning issues
char line[512];
size_t size;
char scan;
int rv,numlines,curr_line;
nc = getnumcols();
nr = getnumrows();
ph = nr - HELP_BOTTOM_MARGIN - HELP_BODY_ROW - 1;
cls();
drawbox(0,0,nr,nc-1,HELPPAGE,0x07,HELPBOX);
drawhorizline(2,0,nc-1,HELPPAGE,0x07,HELPBOX,0); // dumb==0
if (filename == NULL) { // print file contents
gotoxy(HELP_BODY_ROW,HELP_LEFT_MARGIN,HELPPAGE);
cswprint("Filename not given",0x07,HELP_LEFT_MARGIN);
while (1) {
inputc(&scan);
if (scan == ESCAPE) break;
}
cls();
return;
}
rv = loadfile(filename,(void **)&buf.vbuf, &size); // load entire file into memory
if (rv < 0) { // Error reading file or no such file
sprintf(line, "Error reading file or file not found\n file=%s",filename);
gotoxy(HELP_BODY_ROW,HELP_LEFT_MARGIN,HELPPAGE);
cswprint(line,0x07,HELP_LEFT_MARGIN);
while (1) {
inputc(&scan);
if (scan == ESCAPE) break;
}
cls();
return;
}
title = buf.buffer;
text = findline(title,1); // end of first line
*text++='\0'; // end the title string and increment text
// Now we have a file just print it.
gotoxy(1,(nc-strlen(title))/2,HELPPAGE);
csprint(title,0x07);
numlines = countlines(text);
curr_line = 0;
scan = ESCAPE+1; // anything except ESCAPE
while(scan != ESCAPE) {
printtext(text,curr_line);
gotoxy(HELP_BODY_ROW-1,nc-HELP_RIGHT_MARGIN,HELPPAGE);
if (curr_line > 0)
putch(HELP_MORE_ABOVE,0x07,HELPPAGE);
else putch(' ',0x07,HELPPAGE);
gotoxy(nr-HELP_BOTTOM_MARGIN+1,nc-HELP_RIGHT_MARGIN,HELPPAGE);
if (curr_line < numlines - ph)
putch(HELP_MORE_BELOW,0x07,HELPPAGE);
else putch(' ',0x07,HELPPAGE);
inputc(&scan); // wait for user keypress
switch(scan) {
case HOMEKEY:
curr_line = 0;
break;
case ENDKEY:
curr_line = numlines;
break;
case UPARROW:
curr_line--;
break;
case DNARROW:
curr_line++;
break;
case PAGEUP:
curr_line -= ph;
break;
case PAGEDN:
curr_line += ph;
break;
default:
break;
}
if (curr_line > numlines - ph) curr_line = numlines-ph;
if (curr_line < 0) curr_line = 0;
}
cls();
return;
}
// Reads a line of input from stdin. Replace CR with NUL byte
// password <> 0 implies not echoed on screen
// showoldvalue <> 0 implies currentvalue displayed first
// If showoldvalue <> 0 then caller responsibility to ensure that
// str is NULL terminated.
void getuserinput(char *stra, unsigned int size, unsigned int password,
unsigned int showoldvalue)
{
unsigned char c, scan;
char *p, *q; // p = current char of string, q = tmp
char *last; // The current last char of string
char *str; // pointer to string which is going to be allocated
char page;
char row, col;
char start, end; // Cursor shape
char fudge; // How many chars should be removed from output
char insmode; // Are we in insert or overwrite
page = getdisppage();
getpos(&row, &col, page); // Get current position
getcursorshape(&start, &end);
insmode = 1;
str = (char *)malloc(size + 1); // Allocate memory to store user input
memset(str, 0, size + 1); // Zero it out
if (password != 0)
showoldvalue = 0; // Password's never displayed
if (showoldvalue != 0)
strcpy(str, stra); // If show old value copy current value
last = str;
while (*last) {
last++;
} // Find the terminating null byte
p = str + strlen(str);
if (insmode == 0)
setcursorshape(1, 7); // Block cursor
else
setcursorshape(6, 7); // Normal cursor
// Invariants: p is the current char
// col is the corresponding column on the screen
if (password == 0) // Not a password, print initial value
{
gotoxy(row, col, page);
csprint(str, GETSTRATTR);
}
while (1) { // Do forever
c = inputc(&scan);
if (c == '\r')
break; // User hit Enter getout of loop
if (scan == ESCAPE) // User hit escape getout and nullify string
{
*str = 0;
break;
}
fudge = 0;
// if scan code is regognized do something
// else if char code is recognized do something
// else ignore
switch (scan) {
case HOMEKEY:
p = str;
break;
case ENDKEY:
p = last;
break;
case LTARROW:
if (p > str)
p--;
break;
case CTRLLT:
if (p == str)
break;
if (*p == ' ')
while ((p > str) && (*p == ' '))
p--;
else {
if (*(p - 1) == ' ') {
p--;
while ((p > str) && (*p == ' '))
p--;
}
}
while ((p > str) && ((*p == ' ') || (*(p - 1) != ' ')))
p--;
break;
case RTARROW:
if (p < last)
p++;
break;
case CTRLRT:
if (*p == 0)
break; // At end of string
if (*p != ' ')
while ((*p != 0) && (*p != ' '))
p++;
while ((*p != 0) && ((*p == ' ') && (*(p + 1) != ' ')))
p++;
if (*p == ' ')
p++;
break;
case DELETE:
q = p;
while (*(q + 1)) {
*q = *(q + 1);
q++;
}
if (last > str)
last--;
fudge = 1;
break;
case INSERT:
insmode = 1 - insmode; // Switch mode
if (insmode == 0)
setcursorshape(1, 7); // Block cursor
else
setcursorshape(6, 7); // Normal cursor
break;
default: // Unrecognized scan code, look at the ascii value
switch (c) {
case '\b': // Move over by one
q = p;
while (q <= last) {
*(q - 1) = *q;
q++;
}
if (last > str)
last--;
if (p > str)
p--;
fudge = 1;
break;
case '\x15': /* Ctrl-U: kill input */
fudge = last - str;
while (p > str)
*p-- = 0;
p = str;
*p = 0;
last = str;
break;
default: // Handle insert and overwrite mode
if ((c >= ' ') && (c < 128) &&
((unsigned int)(p - str) < size - 1)) {
if (insmode == 0) { // Overwrite mode
if (p == last)
last++;
*last = 0;
*p++ = c;
} else { // Insert mode
if (p == last) { // last char
last++;
*last = 0;
*p++ = c;
} else { // Non-last char
q = last++;
while (q >= p) {
*q = *(q - 1);
q--;
}
*p++ = c;
}
}
} else
beep();
}
break;
}
// Now the string has been modified, print it
if (password == 0) {
gotoxy(row, col, page);
csprint(str, GETSTRATTR);
if (fudge > 0)
cprint(' ', GETSTRATTR, fudge, page);
gotoxy(row, col + (p - str), page);
}
}
*p = '\0';
if (password == 0)
csprint("\r\n", GETSTRATTR);
setcursorshape(start, end); // Block cursor
// If user hit ESCAPE so return without any changes
if (scan != ESCAPE)
strcpy(stra, str);
free(str);
}
