From: ams AT ludd DOT luth DOT se (Martin Str|mberg)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: reusing string variables
Date: 10 Jan 1999 14:34:57 GMT
Organization: University of Lulea, Sweden
Lines: 93
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Non vital information in ().

vern (vern AT iocc DOT com) wrote:
: here is the finction.  it is the part of a 'scrolling window' that
: displays the messages, and scrolls them.
: the locate(x, y) function moves the cursor on the screen to column x,
: and row y. the clrreset() function resets the text colors.
: 
: 
: void msginput(char *msg) /* NEEDS WORK */
: {
: 
: int x = 0; /* used as a loop counter */
: char msg1[78]; /* always contains line 1 */
: char msg2[78]; /* always contains line 2 */
: char msg3[78]; /* always contains line 3 */
: char msg4[78]; /* always contains line 4 */

Are these msg? supposed to remember things in between calls? The code
later on seems to indicate that. Then you need to make them static.

:    textcolor(3); /* set color to cyan */
: 
:    if(count==0) /* print on the top line */
:    {
:       strcpy(msg1,msg);

(As you know the max length is 78 I'd do this to guard against too
long input strings:

#define MAX_LEN (78)

char msg1[ MAX_LEN ];
...
  strncopy(msg1, msg, MAX_LEN);
  msg1[ MAX_LEN - 1 ] = 0;
)

:       locate(2,19);
:       cprintf("%s",msg1);
:       locate(2,20);
:       count++;
:    }
:    else if(count==1) /* print on the second line */
:    {
:       strcpy(msg2,msg);
:       locate(2,20);
:       cprintf("%s",msg2);
:       locate(2,21);
:       count++;
:    }
:    else if(count==2) /* print on the third line */
:    {
:       strcpy(msg3,msg);
:       locate(2,21);
:       cprintf("%s",msg3);
:       locate(2,22);
:       count++;
:    }
:    else if(count==3) /* print on the fourth line */
:    {
:       strcpy(msg4,msg);
:       locate(2,22);
:       cprintf("%s",msg4);
:       count++;
:    }
:    else if(count==4) /* move everything up a line, and print the newest
: line */

(Perhaps you should consider a switch statement.)

:    {
:       strcpy(msg1,msg2); /* recopy all the strings */
:       strcpy(msg2,msg3);
:       strcpy(msg3,msg4);
:       strcpy(msg4,msg);

Here you copy garbage to msg1, then garbage to msg2, then to
msg3. Then you copy your in param (msg) to msg4.

:       locate(2,19);
:      
: cprintf("                                                                             
: ");

(What's this? Doesn't cprintf() support '\n'?)

[Klippa, klapp, kluppit rest of code.]


Holmboe, Symphony No. 8,

							MartinS