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JR

Sat Nov 22, 2008 1:10 pm


Question about chars

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Hey i'm making a small one line text editor. 
in my code i have insert mode and overstrike mode. 

so lets say i have some text: abcdefX                Y  

String length is 20 chars for example

how do i make it add  characters to it after the X(end of text, but not the length of the whole string, just used as example)
it works perfectly when i try to edit the text itself or enter the characters on the X or before, but when i move to Y for example it doesn't display the characters i enter.

if you need to see the code i'll post it up.


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md

Sat Nov 22, 2008 2:47 pm


RE:Question about chars

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I am unsure of your question. Are you wondering how to insert text into the character array? Or is this a UI issue?

And code would be nice.


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JR

Sat Nov 22, 2008 4:36 pm


Re: Question about chars

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this is not UI, just a simple console 1 line editor.  lets say the Array is 50 chars, but only 30 are used i can insert chars into the 31st position, but if i move over to the 32nd -49th i cant insert anything. 

here is my edit function where all the text is inserted etc.  

se - the string
slen - string length
flen is the field length, i use a field to where i write the text.
*start is where the cursor starts in the field
*offset is the location of the text corresponding to the field
ctype - is for later use, not implemented yet.

int dt_edit(char *se, int slen, int row, int col, int flen,
			int *start, int *offset, int *insert, int ctype){
				int done = 0;
				int ch = 0;
				int OldStart = *start;
				char Oldstring[slen];
				int i =0;
				int ii;
				int len = 0;
				strcpy(Oldstring,se);





				while(!done){
					dt_draw(se + *offset,row, col, flen);
					dt_cursor(row, col + *start);
					ch = dt_getkey();
					switch(ch){
	   case ESC:
		   *start = OldStart;
		   strcpy(se,Oldstring);
		   done = 1;
		   break;
	   case RIGHT:
		   if(*start != flen)
			   (*start)++;

		   else if(*start+*offset < slen)
			   (*offset)++;

		   break;

	   case DEL:
		   for(i=*start+*offset;se[i];i++)
			   se[i]=se[i+1];
		   break;

	   case LEFT:
		   if(*start > 0)
			   (*start)--;
		   else if(*offset > 0)
			   (*offset)--;
		   break;
	   case BS:
		   len = strlen(se) - 1;
		   if(*offset+*start != *offset)
		   {
			   for(i=*start+*offset;se[i]-1;i++)
			   {
				   se[i-1] = se[i];

			   }
			   *start = *start - 1;
		   }
		   else if(*offset+*start == *offset && strlen(se) !=0 && *offset >0)
		   {

			   (*offset)--;
			   for(i=*offset+1;se[i];i++)
			   {
				   se[i-1] = se[i];
			   }

			   se[len] = 0;

			   if(*offset + *start !=0 && *offset >2){
				   (*offset) -= 2;
				   (*start)  +=2;
			   }
			   else if(*offset != 0)
			   { (*offset)--;
			   (*start)++;}
		   }



		   break;
	   case HOME:
		   *offset = *start = 0;
		   break;
	   case INS:
		   *insert = !(*insert);
		   /*if(*insert == 0){
		   *insert = 1;
		   }
		   else{
		   *insert = 0;
		   }*/
		   break;

	   case ENTER:
	   case TAB:
	   case UP:
	   case DOWN:
	   case PGUP:
	   case PGDN:
	   case F1:
	   case F2:
	   case F3:
	   case F4:
	   case F5:
	   case F6:
	   case F7:
	   case F8:
	   case F9:
	   case F10:
		   done = 1;
		   break;

	   default:

		   len = strlen(se) +1;




		   if (*start == flen && strlen(se) != slen && (*start + *offset) < slen)
		   {
			   (*start)--;

			   (*offset)++;
		   }

		   if (ch>=32 && ch=*start+*offset;ii--)
						   {
							   se[ii+1] = se[ii];

						   }
						   se[*start+*offset]=ch;
						   (*start)++;
						   se[len]=0;

					   }

				   }

			   }            


			   else
			   {
				   if(*start == flen && strlen(se)!= slen)
				   {
					   (*start)--;
					   (*offset)++;
				   }
				   if(strlen(se) < slen)
				   {

					   if(se[*offset+*start] == 0){
						   se[*offset+*start+1] = 0;
					   }
					   se[*offset+*start] = ch;
					   (*start)++;
				   }
			   }
		   }
		   break;
					}
				}
				return ch;
}



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md

Sun Nov 23, 2008 2:33 pm


RE:Question about chars

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I'm still not sure I understand the question, if you are asking how to insert characters into a char* based string it's pretty simple


WHILE characters to insert AND space in string DO
    FOR i = position to insert character to end of string DO
        string[i+1] = string[i]
    string[position to insert character] = character to insert


Then you either increase the position that you are inserting a character in for every character, or do it the easy way and reverse the string you are inserting.


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DemonWasp

Tue Nov 25, 2008 11:43 pm


RE:Question about chars

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md, I think you mean:

WHILE characters to insert AND space in string DO
    FOR i = (end of string) to (position to insert character) BACKWARDS DO
        string[i+1] = string[i]
    string[position to insert character] = character to insert