As Promised earlier. Here is the code for the text editor I made. It works in linux (ubuntu, fedora, etc.,). Make sure ncurses library is installed before trying to compile it, and don't forget to include lncurses while trying to run compile with gcc.
Following is the code for text editor, Also I have commented the code so it probably will make it easy for you guys to understand
#include <ncurses.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#define size 600000 // total size of text which can be opened roughly around 0.6mb
int x=0, y=0; //x y current coordinates used in menu box portion only
bool search_marks=false; // tells if search marks '[]' should be there or not
char* left(char *string, const int length); //set length of string
void malloc_error(void); // see if memory is successfully allocated or not
//otext editor is the function which takes care of everything which happens in the text editor, all the key presses etc.,
int texteditor(char *text,int maxchars,const int startrow, const int startcol,int maxrows,const int maxcols,const int displayrows, const int returnhandler,const char *permitted, bool ins, const bool allowcr);
/*text stores the text at current instance, maxhars is the maximum number of characters text can store, start row and start col is the number of xy coordinates for editable area
maxrows is the maximum number of rows display area(upper box) will have maxcols is number of max columns display area can have,
ins shows which mode(add or replace) is the writing text is in diplay area
return handler is sued to select the behaviour when we press enter we have selected it to add a new line*/
void remove_search_marks(char* text); //this function looks for search marks if present it'll remove them
int file_exist(char* path); //this function will open a file in read mode at path to see if it exist it returns 1 or 0 based on file existence
void clr_bottom(); // this function clears the areaa below menu so we can have interactive session with user to search, replace or save file etc.,
int save_file(char* text); // this function saves the text in file, it asks the user to give file path In case file at given path already exists it asks user if he want to over write and do so if user want to overwrite
int insert_string(int pos, char* string, char* data); // this function inserts string in data at given pos
int search_string(char *string, char* data); // this function searches for string in the data variable and adds search marks([]) if it finds the text
int delete_string(int pos, int len, char *data); // This functions delets the text of length len from data at given pos
int count_words_chars(char* data); // this funcition counts number of words and characters in the text variable at given time
int replace_string(char* data); // this function searches for a string in variable data and deletes it and then inserts the replacement string in that position
int main(int argc, char* argv[])
{
/* This is the porition we ask user to run program with file path and mode to open*/
FILE* fp; //declare a file pointer to open file
int file_size; //a variable to know file size, but it is useless so you may remove it (I have declared various such variables during program typing)
int maxchars=size/*number of characters allowed to be opened*/,startrow=0/*cursor start row*/,startcol=0/*cursor start column*/;
int maxrows=10000/*maximum number of rows allowed calculated by (maxchars/maxcols)*/,maxcols=60/*maximum number of rows allowed calculated by (maxchars/maxrows)*/;
int displayrows=20/*number of rows displayed in text box(scroll added too)*/,returnhandler=1/*select behaviour for enter key press*/;
char *message=malloc(maxchars*sizeof(char)); //allocate memory for our message string
bool ins=false/*insert mode is initially false means text will be replaced in beginning*/,allowcr=true;
if(argc<3)/*in case program is not given the necessary arguments*/
{
printf("usage: %s filename mode | modes can be \nopen new file with [w] open existing file with [r]\n\n",argv[0]);/* generate an error */
return 0;/*and exit*/
}
if(strcmp(argv[2],"w")==0)/*if user asked toopen a new file*/
{
if(file_exist(argv[1]))/*check if file exist?*/
{
printf("file already exist : \n");/*in case file already exist, tell user about it*/
return 0;/*and exit*/
}
else /*in case file didn't exist already*/
fp=fopen(argv[1],"w+");/*create the file and assign it's address to fp*/
}
else if(strcmp(argv[2],"r")==0)/*in case user want to open an existing file*/
{
if(!file_exist(argv[1]))/*check if file exist*/
{
printf("file does not exist : \n");/*in case file didn't exist display the error*/
return 0;/*and exit*/
}
else/*in case file exist*/
fp=fopen(argv[1],"r+");/*open it*/
}
else/**in case user specified a mode other than r or w to open a file*/
{
printf("wrong mode specified\n");/*dsiplay error*/
return 0;/*exit*/
}
/////////// WE checked above if user has done everythign right while runing the program
////////////////file work above
// if user did everythign right then we read the data from openend file here
int i=0;/*just to count*/
char c;/*just to read a character from file */
if(fp!=NULL)/*if fp is pointing to a file*/
{
while((c=fgetc(fp))!=EOF)/*keep getting a charcetr from file unless it reaches end of file*/
{message[i]=(char)c;i++;}/*add the charcetr to data structure message*/
fclose(fp);/*close file when done traversing*/
}
// read all the text from file in variable message
///////////////////////////////////reading
//// doing our text screen initialization
initscr(); //initialize screen for text box
noecho(); //disable echo so whatever we press shouldn't be randomly displayed on textbox
cbreak(); //get all the key presses in our program except few specific signals
keypad(stdscr,TRUE);//initialize our screen for keypad for example arrow keys and num keys
////////////////////////menu down
move(20,0); // down menu starts from y=20
hline(ACS_CKBOARD,80); // placing a horizontal line to separate menu from text area here
///////////////Now we print menu here
mvaddstr(21,0,"Home = goto first character on current row");
mvaddstr(21,50,"F3 to search and remove Text");
mvaddstr(22,50,"F2 to delete all text");
mvaddstr(22,0,"PgDn = goto last character in text string");
mvaddstr(23,50,"F4 to replace Text");
mvaddstr(23,0,"INS = insert mode on/off");
mvaddstr(24,0,"PgUp = goto first character in text string");
mvaddstr(24,50,"Press ESCAPE to quit");
mvaddstr(25,0,"End = goto last character on current row");
mvaddstr(25,50,"CTRL-Y to Delete Current Line");
mvaddstr(26,0,"F6 to see number of words and characters");
mvaddstr(26,50,"F5 = to save file");
mvaddstr(27,0,"F7 to remove search marks");
///****************MENU above*/
////////////menu printed now call the most important function the text editor
texteditor(message,maxchars,startrow,startcol,maxrows,maxcols,displayrows,returnhandler,NULL,ins,allowcr);
/*with variables as explained above*/
// user exited text editor? clear and restrore original console windwo
clear();//once returned from texteditor clear the screen and buffer
endwin();//end window
// printf("Message\n-------\n\"%s\"",message);
free(message); // free memory allocated for message
return 0;//and exit
}
int texteditor(char *text, int maxchars, const int startrow, const int startcol,int maxrows,const int maxcols,const int displayrows,const int returnhandler,const char *permitted, bool ins, const bool allowcr)
{
int ky,position=0,row,col,scrollstart=0, x=0, y=0; //ky is most of the time the input user gives, position(it stays in sync with cursor) points to text row and col keep track of row or column being managed, scroll start keeps track of position from where scroll starts, x and y are xy coordinates on screen
char *where, *original, *savetext,**display, *last_undo; // where keeps the line of text for a while, original is the text as copied from text file
bool exitflag=false; // save text is used to keep a backup of our text so we may get previous text bac if something unusuall happens
// last undo is useless // display is 2 dimensional array to keep enough text in it to fill the diplay window
if (!maxchars) // if user has not specified maxchars
maxchars=maxrows*maxcols+1;
if (!maxrows || maxrows > maxchars-1) // if maxrows are not specified or maxchars are less then number of rows possible then make sure max rows are less then maxchars
maxrows=maxchars-1;
if (ins) // if ins variable is set
curs_set(2); //then set cursor to high visibility mode
else //else keep it normal
curs_set(1);
/* below we will allocate memory to our above declared arrays and assign data to them*/
if ((display = malloc(maxrows * sizeof(char *))) ==NULL) /*assign memory equal to number of maxrows to display*/
malloc_error(); //call the function to check if memory was successfully allocated
for(ky = 0; ky < maxrows; ky++) //now traverse all rows in display and allocated and assign memory equal to maxcols to each row of display
if ((display[ky] = malloc((maxcols+1) * sizeof(char)))==NULL)
malloc_error();
if ((original=malloc(maxchars*sizeof(char)))==NULL) //allocated memory to original
malloc_error();
strcpy(original,text);//copy text taken from file to original variable
if ((savetext=malloc(maxchars*sizeof(char)))==NULL)// allocate memory to savetext
malloc_error();
strcpy(savetext,text);//copy text to savetext
/*finished assigning**/
while (!exitflag) // our loop to stay in unless user presses a button to turn exit flag true initially it is set false
{
int counter; //counter to count
do //start of do while loop
{
counter=0;
where=text; //temporarily copy all text taken from file to where
for (row=0; row < maxrows; row++) // initialize display vriable making sure every row has a null in the start
{
display[row][0]=127; //assign a backspace character to first column of every row
display[row][1]='\0'; //assign a null character to second column of every row indicating that the row ends here
}
row=0; // set row to zero
while ((strlen(where) > maxcols || strchr(where,'\n') != NULL) && (display[maxrows-1][0]==127 || display[maxrows-1][0]=='\n')) //while loop
//keep traversing if both of following conditions are met successfully
//1. length of text(where) is more than number of columns which means there are more than one rows
// "OR" if a new row exist
//2. if first column of last row has a backspace OR an end of line character(means we haev not reached last row yet)
{
strncpy(display[row],where,maxcols); //copy text from where to current row of display from where specifyint he maximum columns it can have
display[row][maxcols]='\0'; // insert a null at the end of a row indicating that the row ends here
if (strchr(display[row],'\n') != NULL) // if there s a new line character in this row
left(display[row],strchr(display[row],'\n')-display[row]);//end the row where a new line character is found
else //in case there is no newline character in this row
left(display[row],strrchr(display[row],' ')-display[row]);//mark end of row at next white space charcter
if (display[maxrows-1][0]==127 || display[maxrows-1][0]=='\n')//if first column of last row has a backspace OR an end of line character
{
where+=strlen(display[row]); // move where pointer to the address before which text is already dealt with
if (where[0]=='\n' || where[0]==' ' || where[0]=='\0') //in case where points to and of newline characters
where++; //move one step forward
row++; //current is dealt with now we move to next row
}
}// while loop ends here text is assigned to display datas tructure properly
if (row == maxrows-1 && strlen(where) > maxcols) // if we have reached last row and remaining text is more than number of characters last row can have
{
strcpy(text,savetext); //copy the savetext to text
if (ky==127/*KEY_BACKSPACE*/) //if ky is KEY_BACKSPACE
position++; //increase position variable
counter=1; //set counter to be one since there is text remaining to be copied
}
}while (counter);//do while loop ends here
strcpy(display[row],where);//now copy remaining text from where to display row
ky=0; //set ky to be 0
if (strchr(display[maxrows-1],'\n') != NULL) //if first character of last row is a newline character
if (strchr(display[maxrows-1],'\n')[1] != '\0') //and second charcter is a newline character
ky=127/*KEY_BACKSPACE*/; //then set ky to be equal to backspace
col=position; //set current column to be equal to position of cursor we are at
row=0; // set row to pont to fisrt row
counter=0; //set counter to be 0
while (col > strlen(display[row])) //keep traversing if column is greator than number of columsn in current row
{
col-=strlen(display[row]); //set column= column - number of columns of current row
counter+=strlen(display[row]); //set counter to point at the end of current row
if (text[counter] ==' ' || text[counter]=='\n' || text[counter]=='\0') //in case text at current cursor position is a newline character
{
col--; //decrease col by one
counter++; //point to text charcter in text
}
row++; //increase row by one since current row has been properly taken care of
}
if (col > maxcols-1) //in case col is greator than total number of columns a row can hev
{
row++; //move to next row means increment row variable
col=0; //set col = 0 means point to first colunmn in next row
}
if (!ky) // otherwise ky==KEY_BACKSPACE and we're getting rid of the last character we entered to avoid pushing text into the last line +1
{
if (row < scrollstart) // in case current row is lower than scroll start
scrollstart--; // then decrease scroll start
if (row > scrollstart+displayrows-1) //in case current row is greator than scroll start plus number of displayrows
scrollstart++; //then increase scroll start
for (counter=0;counter < displayrows; counter++) //traverse all the display rows
{
mvhline(counter+startrow,startcol,' ',maxcols); //move to position counter+startrow on y coordinate and startcol on x coordinate and print spaces on all columns onwards from counter of this row
if (display[counter+scrollstart][0] != 127) //if current position has a backspace in it then
mvprintw(counter+startrow,startcol,"%s",display[counter+scrollstart]);//move to position counter+startrow on y and startcol on x and display text in display area
}
move(row+startrow-scrollstart,col+startcol); // move to end of text
ky=getch(); // text has been displayed now wait for user to press a key
}
switch(ky) // take actions based on pressed key
{
case 27: //escape
exitflag=true; //set exitflag to be true
break;
case KEY_F(2): //f2 key to delete all file contents
memset(text,'\0',maxchars); //make all the contens of file to be null
position=0; //set postion to be zero
scrollstart=0; //set scroll start to be zero
break;
case KEY_F(3): //f3 key to search for strings
getyx(stdscr,y,x);//get current coordinates of cursor
remove_search_marks(text);//remove searchmarks from text
search_string(NULL,text); //goto search function
clr_bottom(); //clear the interactive area below menu
move(y,x); //move back to textbox
break;
case KEY_F(4): //f4 to replace strings
getyx(stdscr,y,x); //get current coordinates of cursor
replace_string(text);//call the function to replace string
clr_bottom();
move(y,x);
break;
case KEY_F(5): //f5 key to save file
getyx(stdscr,y,x);
save_file(text); //call the function save file
clr_bottom();
move(y,x);
break;
case KEY_F(6): //f6 key to count number of words
clr_bottom();
count_words_chars(text); //call the function to count words and chars in text
case KEY_F(7): //f7 key to remove search marks
remove_search_marks(text); //remove search marks
case KEY_HOME: //move to start of current row
if (col) //if current column is not the first column
{
position=0;//set position to be zero
for (col=0; col < row; col++)//traverse until col is less then row
{
position += strlen(display[col]);//move cursor to end of current row in display array
if ((strchr(display[row],'\n') != NULL) || (strchr(display[row],' ') != NULL))//if there is a escape character ' ' or '\n' in current row
position++; // increment position and move to start of the row
}
}
break;
case KEY_END: //move to end of current row
if (col < strlen(display[row])) //if col is less than number of columns in current row
{
position=-1; //set potiion to -1
for (col=0; col <=row; col++) //traverse until col is less than or equal to row (row is position of current row)
{
position+=strlen(display[col]);//set position to be the end of curent row
if ((strchr(display[row],'\n') != NULL) || (strchr(display[row],' ') != NULL)) //if we haev reached enf of row
position++; //increment position so it may move to end of current row
}
}
break;
case KEY_PPAGE: //move to start of text
position=0; //set position to be zero
scrollstart=0; //set scroll start to be zero
break;
case KEY_NPAGE: //move to end of text
position=strlen(text); //set postion to be end of text
for (counter=0; counter < maxrows; counter++) //traverse until counter is less than total number of rows
if(display[counter][0]==127) //if the row at position counter's first character is backspace
break; //then break from loop
scrollstart=counter-displayrows; //else set scroll start to equal counter-displayrows
if (scrollstart < 0) //in case scroll start has decreased to become negative
scrollstart=0; //set it to be zero again
break;
case KEY_LEFT: //move cursor left
if (position) //if position is not zero
position--; //decrease by one
break;
case KEY_RIGHT: //move cursor right
if (position < strlen(text) && (row != maxrows-1 || col < maxcols-1))//if cursor is not already at end or far from end
position++; //increase position by one
break;
case KEY_UP: //move cursor up
if (row) //in case we are not on first row
{
if (col > strlen(display[row-1]))//if current column is greater then length of previous row
position=strlen(display[row-1]); //then set cursor at the end of above row
else
position=col; //else set position to col
ky=0; //set ky=0
for (col=0; col < row-1; col++) //traverse for col less than row above current row
{
position+=strlen(display[col]); //move cursor to end of column
ky+=strlen(display[col]); //move ky to next row
if ((strlen(display[col]) < maxcols) || (text[ky]==' ' && strlen(display[col])==maxcols))//if we are not already at end of row
{
position++; //increment position
ky++; //move to next row
}
}
}
break;
case KEY_DOWN:// move cursor to below row
if (row < maxrows-1) //if it's not last row
if (display[row+1][0] !=127) //if next row is not empty
{
if (col < strlen(display[row+1])) //if col is less than length of next row
position=col; //set position to be col
else
position=strlen(display[row+1]);//set position to be end of above row
ky=0;//set ky=0;
for (col=0; col <= row; col++)//traverse until we reach the current row
{
position+=strlen(display[col]);//move to next row
ky+=strlen(display[col]);//move to next row
if ((strlen(display[col]) < maxcols) || (text[ky]==' ' && strlen(display[col])==maxcols))//if we are not already at end of row
{
position++;
ky++;
}
}
}
break;
case KEY_IC: // insert key
ins=!ins;//invert the insert mode, turn it on if it's on or vice versa
if (ins)
curs_set(2);
else
curs_set(1);
break;
case 330://KEY_DC: // delete key
if (strlen(text))//if text exist
{
strcpy(savetext,text);//save text
memmove(&text[position],&text[position+1],maxchars-position);//move text to left by one character meanwhile eating the one character, search google for function memove and read about it...
}
break;
case KEY_BACKSPACE:// remove text
if (strlen(text) && position)//if text exist and cursor is already not at begiing of text
{
strcpy(savetext,text);//save text
position--;//decrease poition by one basically making cursor go back
memmove(&text[position],&text[position+1],maxchars-position);//move text to left by one character meanwhile eating the one character
}
break;
case 25: // ctrl-y delete entire line
if (display[1][0] != 127)//if there's text on first row
{
position-=col;//move cursor to start of first row
ky=0;//set ky=0
do
{
memmove(&text[position],&text[position+1],maxchars-position);//move text right by one
ky++;//increase ky
}
while (ky < strlen(display[row]));//keep doing it until ky is less than number of columns in current row
}
else
memset(text,'\0',maxchars);//other wise it's already empty
break;
case 10: // return // insert a line by pressing return button
switch (returnhandler)//see what do we want enter to do
{
case 1:// in case return handler==1
if (display[maxrows-1][0] == 127 || display[maxrows-1][0] == '\n')// if display area is not empty
{
memmove(&text[position+1],&text[position],maxchars-position);//move text to right by one, emptying the space for one charectre at potiions
text[position]='\n'; //insert a new row character at position in text
position++;//increase poition
}
break;
case 2:
ky=' ';//insert a space
ungetch(ky);//
break;
case 3:
exitflag=true;//exit
}
break;
default: //in case of any other characters than specified above
if (((permitted==NULL && ky > 31 && ky < 127) || (permitted != NULL && strchr(permitted,ky))) && strlen(text) < maxchars-1 && (row !=maxrows-1 || (strlen(display[maxrows-1]) < maxcols || (ins && (row!=maxrows-1 && col < maxcols )))))
{
if (ins || text[position+1]=='\n' || text[position]== '\n') //in ase insert mode is on or there is no text after this in current row
memmove(&text[position+1],&text[position],maxchars-position);//move text to right by one and add characters
text[position]=ky;//insert current key in text
if (row != maxrows-1 || col < maxcols-1)//in case insert mode is off and we're not at the end of row
position++;//increment position(move cursor to right)
}
}
if(!allowcr)//if isnert mode is allowed
if (text[0]=='\n') //if first char in text is a newline
{
memmove(&text[0],&text[1],maxchars-1);//movetext to left by one
if (position)//if position is not zero
position--;//decrease position
}
}//switch ends here
/*user decided to exit free all assigned memory */
free(original);//free memory of original
free(savetext);//free memory of savetext
free(last_undo);//free memory of last undo, it's not used at all so no need for it
for(scrollstart = 0; scrollstart < maxrows; scrollstart++)//traverse all rows of siplay and free their memory
free(display[scrollstart]);
free(display);//free dispay
/************************/
return 0;
}
char* left(char *string, const int length)
{
if (strlen(string) > length) // if length of string is more than length then add a null to string to shorten its length to length
string[length]='\0';
return string;
}
void malloc_error(void) // in case of mallox error just exit
{
endwin();//end window
fprintf(stderr, "malloc error:out of memory\n");//print error
exit(EXIT_FAILURE);//generate signal for exit and exit
}
/***/
int file_exist(char* path)
{
FILE *fp = fopen(path,"r"); // open file in read mode
if(fp==NULL) // couldn't open mean file not existing
return 0;
fclose(fp); //close file if opened means file exists
return 1;
}
void clr_bottom() // scroll from 29th row to max number of rows to set it to blank spaces,, it basically used to clear the text
{
int i=0, j=0; //counters
int max_y, max_x; // max coordinates we can haev on scren
getmaxyx(stdscr,max_y, max_x);// get maximum coordinates
for(i=29; i<max_y; i++) //start from 29 and traverse unless we rach end of screen
{
for(j=0; j<max_x; j++) //traverse all columns of each row
{
move(i,j); //move to right
addch(' '); //insert a space
}
}
}
int save_file(char* text) //save file
{
char path[200], ch_over, spath='a'; int sp; //path is the path to file, ch_over is just to input a character spath is a condition variablle
int i=0;
FILE* fps; //pointer for file
move(33, 0);//move cursor to lower area
printw("Enter path to save the text: "); // ask for path
while(spath!='\n') // getting path
{
spath=getch(); //get path
sp=(int) spath; //get code verion of pressed key
if((sp>=65 && sp<=90) || (sp>=48 && sp<=57) || (sp>=97 && sp<=122) || sp==95 || sp==46)
{
addch(spath); //if it is an alphanumeric chaacter
path[i]=spath;i++;//add to path variable
}
if(sp==27 )//escape key) // press escape to abort entering path
{
move(33,0); deleteln(); //delete line fromm below area
return 0;
}
}
path[i]='\0';//add null to end of path variable
if(file_exist(path)) // in case file is already there do this
{
move(33, 0);deleteln(); //deleet line form menu
printw("\nFile with this name already exist, Press 'y' to over write?");
ch_over=getch();
addch(ch_over);
if(ch_over=='y')//if user pressed y
{
fps=fopen(path,"w+");//open file
fprintf(fps,"%s",text);//write text to file
fclose(fps);//close file
move(33, 0);deleteln();//delete line in menu
printw("\nFile saved ");
return 1;
}
move(33, 0);deleteln();
printw("\nFile not saved "); //if did not user press y then tell him it's not saved
return 0;
}
fps=fopen(path,"w+"); // file wasn't there open a new file
fprintf(fps,"%s",text); //save text to file
move(33, 0);deleteln(); //delete line from menu
printw("\nFile saved ");//tell user file saved
fclose(fps);//close file
return 1;
}
///////////////////
int insert_string(int pos, char* string, char* data)
{
int i=pos, j=0;
if(strlen(data)==0) // if data has no charcters thendo this
{
for(i=0; i<strlen(string); i++) //traverse string which has to be inserted in data
{
data[i]=string[i]; //append strng to data
}
}
// if data has some text in it already then make space to insert text
else
{
for(i=strlen(data); i>=pos; i--)//keep moving until given position arrives
{
data[i+strlen(string)]=data[i]; //move text to right making space at the required position for string
}
for(i=pos; i<pos+strlen(string); i++, j++)//above loop has made space no isert string in that position
{
if(string[j]!='\0')
data[i]=string[j];
}
}
return 0;
}
int search_string(char *string, char* data)
{
int i=0, j=0, start[100], end[100], n_o_occur=0, maxchars=size;
char ch='a', s_a='n', st[2]="[", en[2]="]";
move(32,0);
if(string==NULL) // if user has not given any string to search then ask him to enter one
{
s_a='y';
string = malloc(500*sizeof(char));
printw("Enter String to search for: ");
while(ch!='\n')
{
ch=getch();
addch(ch);
string[i]=ch;i++;
if(ch==127) //bakspace
{
getyx(stdscr,y,x);
move(y,x-1);
}
if(ch==27 )//escape key)
{
move(33,0); deleteln();
return 0;
}
}
string[i]='\0';
}
int flag=0, len1, len2;
len1 = strlen(string);
len2 = strlen(data);
if (len1 > len2){ // if seach string is greator than data then it's wrong string so exit
return 0;
}
for (i = 0; i <= len2; ++i){ // start loop and traverse thorough data and match string
if (string[0]==data[i]){ // if first character of string is found in data
flag = 1; //set flag to be one
for (j = 1; j<(len1-1) && (i+j)<strlen(data); ++j){ // see if remaning characters are also there then
if (string[j]!=data[i+j]){
flag=0; // all characters were not matched set flag to 0 and start searching in next part of data
break;
}
}
if((flag==1 || (i+j)>strlen(data)) && s_a=='n') // if user is sarching for a string then just tel positio of first rting
{
break;
}
if((flag==1 || (i+j)>strlen(data)) && s_a=='y') // if searching for a string in all data then keep going and insert the search marks [] in text
{
insert_string(i,st,data); insert_string(i+j+1,en,data);i=i+1;
search_marks=true;
}
}
}
if (flag==1){
return i;
}
return -1;
}
int delete_string(int pos, int len, char *data) // delet a string at pos of length len from data
{
int i;
i=pos;
for(i=pos; i<strlen(data)-len; i++) // taraverse here
{
data[i]=data[i+len]; // keep moving backwards
}
data[i]='\0';
return 0;
}
int count_words_chars(char* data)
{
int i=0, wrd_count=0;
for(i=0; i<strlen(data); i++)
{
if(i==0)
wrd_count++;
if(data[i]==' ' || data[i]=='\n') // saecg for new line or space and mark word++
{
wrd_count++;
}
}
move(34,0);
printw("Characters: %d, Words: %d",strlen(data), wrd_count);
return 0;
}
int replace_string(char* data)
{
int pos, i=0, j=0, start[100], end[100],n_o_occur=0, maxchars=size;
char string[500], *replace_with, ch='a';
replace_with=malloc(500*sizeof(char));
move(32, 0);deleteln();
printw("Enter String to replace: "); // take the string to replace
while(ch!='\n')
{
ch=getch();
addch(ch);
if(ch!='\n'){string[i]=ch;i++;}
if(ch==27 )//escape key)
{
move(33,0); deleteln();
return 0;
}
}
string[i]='\0';
ch='a';
move(33, 0);
i=0;printw("Enter replacement string: "); // take the string to replace with
while(ch!='\n')
{
ch=getch();
addch(ch);
if(ch!='\n')
{replace_with[i]=ch;i++;}
if(ch==27 )//escape key)
{
move(33,0); deleteln();
return 0;
}
}
deleteln();
replace_with[i]='\0';
while((pos=search_string(string, data))!=-1) // now search the string to be replaced and get its position
{
delete_string(pos, strlen(string), data); // delete the searched string dfrom its position
insert_string(pos, replace_with, data); // insert the replacement string at that position
}
free(replace_with);
return 0;
}
void remove_search_marks(char* text) // fnd [] marks and remove them
{
int i;
if(search_marks==true) // if search marks exist then remove them and tell search marks don't exist anymore
{
search_marks=false;
for(i=0; i<strlen(text); i++)
{
if(text[i]=='[' || text[i]==']')
{
delete_string(i,1,text);
}
}
}
}
/*****/
To download the code file, Click here
Following is the code for text editor, Also I have commented the code so it probably will make it easy for you guys to understand
#include <ncurses.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#define size 600000 // total size of text which can be opened roughly around 0.6mb
int x=0, y=0; //x y current coordinates used in menu box portion only
bool search_marks=false; // tells if search marks '[]' should be there or not
char* left(char *string, const int length); //set length of string
void malloc_error(void); // see if memory is successfully allocated or not
//otext editor is the function which takes care of everything which happens in the text editor, all the key presses etc.,
int texteditor(char *text,int maxchars,const int startrow, const int startcol,int maxrows,const int maxcols,const int displayrows, const int returnhandler,const char *permitted, bool ins, const bool allowcr);
/*text stores the text at current instance, maxhars is the maximum number of characters text can store, start row and start col is the number of xy coordinates for editable area
maxrows is the maximum number of rows display area(upper box) will have maxcols is number of max columns display area can have,
ins shows which mode(add or replace) is the writing text is in diplay area
return handler is sued to select the behaviour when we press enter we have selected it to add a new line*/
void remove_search_marks(char* text); //this function looks for search marks if present it'll remove them
int file_exist(char* path); //this function will open a file in read mode at path to see if it exist it returns 1 or 0 based on file existence
void clr_bottom(); // this function clears the areaa below menu so we can have interactive session with user to search, replace or save file etc.,
int save_file(char* text); // this function saves the text in file, it asks the user to give file path In case file at given path already exists it asks user if he want to over write and do so if user want to overwrite
int insert_string(int pos, char* string, char* data); // this function inserts string in data at given pos
int search_string(char *string, char* data); // this function searches for string in the data variable and adds search marks([]) if it finds the text
int delete_string(int pos, int len, char *data); // This functions delets the text of length len from data at given pos
int count_words_chars(char* data); // this funcition counts number of words and characters in the text variable at given time
int replace_string(char* data); // this function searches for a string in variable data and deletes it and then inserts the replacement string in that position
int main(int argc, char* argv[])
{
/* This is the porition we ask user to run program with file path and mode to open*/
FILE* fp; //declare a file pointer to open file
int file_size; //a variable to know file size, but it is useless so you may remove it (I have declared various such variables during program typing)
int maxchars=size/*number of characters allowed to be opened*/,startrow=0/*cursor start row*/,startcol=0/*cursor start column*/;
int maxrows=10000/*maximum number of rows allowed calculated by (maxchars/maxcols)*/,maxcols=60/*maximum number of rows allowed calculated by (maxchars/maxrows)*/;
int displayrows=20/*number of rows displayed in text box(scroll added too)*/,returnhandler=1/*select behaviour for enter key press*/;
char *message=malloc(maxchars*sizeof(char)); //allocate memory for our message string
bool ins=false/*insert mode is initially false means text will be replaced in beginning*/,allowcr=true;
if(argc<3)/*in case program is not given the necessary arguments*/
{
printf("usage: %s filename mode | modes can be \nopen new file with [w] open existing file with [r]\n\n",argv[0]);/* generate an error */
return 0;/*and exit*/
}
if(strcmp(argv[2],"w")==0)/*if user asked toopen a new file*/
{
if(file_exist(argv[1]))/*check if file exist?*/
{
printf("file already exist : \n");/*in case file already exist, tell user about it*/
return 0;/*and exit*/
}
else /*in case file didn't exist already*/
fp=fopen(argv[1],"w+");/*create the file and assign it's address to fp*/
}
else if(strcmp(argv[2],"r")==0)/*in case user want to open an existing file*/
{
if(!file_exist(argv[1]))/*check if file exist*/
{
printf("file does not exist : \n");/*in case file didn't exist display the error*/
return 0;/*and exit*/
}
else/*in case file exist*/
fp=fopen(argv[1],"r+");/*open it*/
}
else/**in case user specified a mode other than r or w to open a file*/
{
printf("wrong mode specified\n");/*dsiplay error*/
return 0;/*exit*/
}
/////////// WE checked above if user has done everythign right while runing the program
////////////////file work above
// if user did everythign right then we read the data from openend file here
int i=0;/*just to count*/
char c;/*just to read a character from file */
if(fp!=NULL)/*if fp is pointing to a file*/
{
while((c=fgetc(fp))!=EOF)/*keep getting a charcetr from file unless it reaches end of file*/
{message[i]=(char)c;i++;}/*add the charcetr to data structure message*/
fclose(fp);/*close file when done traversing*/
}
// read all the text from file in variable message
///////////////////////////////////reading
//// doing our text screen initialization
initscr(); //initialize screen for text box
noecho(); //disable echo so whatever we press shouldn't be randomly displayed on textbox
cbreak(); //get all the key presses in our program except few specific signals
keypad(stdscr,TRUE);//initialize our screen for keypad for example arrow keys and num keys
////////////////////////menu down
move(20,0); // down menu starts from y=20
hline(ACS_CKBOARD,80); // placing a horizontal line to separate menu from text area here
///////////////Now we print menu here
mvaddstr(21,0,"Home = goto first character on current row");
mvaddstr(21,50,"F3 to search and remove Text");
mvaddstr(22,50,"F2 to delete all text");
mvaddstr(22,0,"PgDn = goto last character in text string");
mvaddstr(23,50,"F4 to replace Text");
mvaddstr(23,0,"INS = insert mode on/off");
mvaddstr(24,0,"PgUp = goto first character in text string");
mvaddstr(24,50,"Press ESCAPE to quit");
mvaddstr(25,0,"End = goto last character on current row");
mvaddstr(25,50,"CTRL-Y to Delete Current Line");
mvaddstr(26,0,"F6 to see number of words and characters");
mvaddstr(26,50,"F5 = to save file");
mvaddstr(27,0,"F7 to remove search marks");
///****************MENU above*/
////////////menu printed now call the most important function the text editor
texteditor(message,maxchars,startrow,startcol,maxrows,maxcols,displayrows,returnhandler,NULL,ins,allowcr);
/*with variables as explained above*/
// user exited text editor? clear and restrore original console windwo
clear();//once returned from texteditor clear the screen and buffer
endwin();//end window
// printf("Message\n-------\n\"%s\"",message);
free(message); // free memory allocated for message
return 0;//and exit
}
int texteditor(char *text, int maxchars, const int startrow, const int startcol,int maxrows,const int maxcols,const int displayrows,const int returnhandler,const char *permitted, bool ins, const bool allowcr)
{
int ky,position=0,row,col,scrollstart=0, x=0, y=0; //ky is most of the time the input user gives, position(it stays in sync with cursor) points to text row and col keep track of row or column being managed, scroll start keeps track of position from where scroll starts, x and y are xy coordinates on screen
char *where, *original, *savetext,**display, *last_undo; // where keeps the line of text for a while, original is the text as copied from text file
bool exitflag=false; // save text is used to keep a backup of our text so we may get previous text bac if something unusuall happens
// last undo is useless // display is 2 dimensional array to keep enough text in it to fill the diplay window
if (!maxchars) // if user has not specified maxchars
maxchars=maxrows*maxcols+1;
if (!maxrows || maxrows > maxchars-1) // if maxrows are not specified or maxchars are less then number of rows possible then make sure max rows are less then maxchars
maxrows=maxchars-1;
if (ins) // if ins variable is set
curs_set(2); //then set cursor to high visibility mode
else //else keep it normal
curs_set(1);
/* below we will allocate memory to our above declared arrays and assign data to them*/
if ((display = malloc(maxrows * sizeof(char *))) ==NULL) /*assign memory equal to number of maxrows to display*/
malloc_error(); //call the function to check if memory was successfully allocated
for(ky = 0; ky < maxrows; ky++) //now traverse all rows in display and allocated and assign memory equal to maxcols to each row of display
if ((display[ky] = malloc((maxcols+1) * sizeof(char)))==NULL)
malloc_error();
if ((original=malloc(maxchars*sizeof(char)))==NULL) //allocated memory to original
malloc_error();
strcpy(original,text);//copy text taken from file to original variable
if ((savetext=malloc(maxchars*sizeof(char)))==NULL)// allocate memory to savetext
malloc_error();
strcpy(savetext,text);//copy text to savetext
/*finished assigning**/
while (!exitflag) // our loop to stay in unless user presses a button to turn exit flag true initially it is set false
{
int counter; //counter to count
do //start of do while loop
{
counter=0;
where=text; //temporarily copy all text taken from file to where
for (row=0; row < maxrows; row++) // initialize display vriable making sure every row has a null in the start
{
display[row][0]=127; //assign a backspace character to first column of every row
display[row][1]='\0'; //assign a null character to second column of every row indicating that the row ends here
}
row=0; // set row to zero
while ((strlen(where) > maxcols || strchr(where,'\n') != NULL) && (display[maxrows-1][0]==127 || display[maxrows-1][0]=='\n')) //while loop
//keep traversing if both of following conditions are met successfully
//1. length of text(where) is more than number of columns which means there are more than one rows
// "OR" if a new row exist
//2. if first column of last row has a backspace OR an end of line character(means we haev not reached last row yet)
{
strncpy(display[row],where,maxcols); //copy text from where to current row of display from where specifyint he maximum columns it can have
display[row][maxcols]='\0'; // insert a null at the end of a row indicating that the row ends here
if (strchr(display[row],'\n') != NULL) // if there s a new line character in this row
left(display[row],strchr(display[row],'\n')-display[row]);//end the row where a new line character is found
else //in case there is no newline character in this row
left(display[row],strrchr(display[row],' ')-display[row]);//mark end of row at next white space charcter
if (display[maxrows-1][0]==127 || display[maxrows-1][0]=='\n')//if first column of last row has a backspace OR an end of line character
{
where+=strlen(display[row]); // move where pointer to the address before which text is already dealt with
if (where[0]=='\n' || where[0]==' ' || where[0]=='\0') //in case where points to and of newline characters
where++; //move one step forward
row++; //current is dealt with now we move to next row
}
}// while loop ends here text is assigned to display datas tructure properly
if (row == maxrows-1 && strlen(where) > maxcols) // if we have reached last row and remaining text is more than number of characters last row can have
{
strcpy(text,savetext); //copy the savetext to text
if (ky==127/*KEY_BACKSPACE*/) //if ky is KEY_BACKSPACE
position++; //increase position variable
counter=1; //set counter to be one since there is text remaining to be copied
}
}while (counter);//do while loop ends here
strcpy(display[row],where);//now copy remaining text from where to display row
ky=0; //set ky to be 0
if (strchr(display[maxrows-1],'\n') != NULL) //if first character of last row is a newline character
if (strchr(display[maxrows-1],'\n')[1] != '\0') //and second charcter is a newline character
ky=127/*KEY_BACKSPACE*/; //then set ky to be equal to backspace
col=position; //set current column to be equal to position of cursor we are at
row=0; // set row to pont to fisrt row
counter=0; //set counter to be 0
while (col > strlen(display[row])) //keep traversing if column is greator than number of columsn in current row
{
col-=strlen(display[row]); //set column= column - number of columns of current row
counter+=strlen(display[row]); //set counter to point at the end of current row
if (text[counter] ==' ' || text[counter]=='\n' || text[counter]=='\0') //in case text at current cursor position is a newline character
{
col--; //decrease col by one
counter++; //point to text charcter in text
}
row++; //increase row by one since current row has been properly taken care of
}
if (col > maxcols-1) //in case col is greator than total number of columns a row can hev
{
row++; //move to next row means increment row variable
col=0; //set col = 0 means point to first colunmn in next row
}
if (!ky) // otherwise ky==KEY_BACKSPACE and we're getting rid of the last character we entered to avoid pushing text into the last line +1
{
if (row < scrollstart) // in case current row is lower than scroll start
scrollstart--; // then decrease scroll start
if (row > scrollstart+displayrows-1) //in case current row is greator than scroll start plus number of displayrows
scrollstart++; //then increase scroll start
for (counter=0;counter < displayrows; counter++) //traverse all the display rows
{
mvhline(counter+startrow,startcol,' ',maxcols); //move to position counter+startrow on y coordinate and startcol on x coordinate and print spaces on all columns onwards from counter of this row
if (display[counter+scrollstart][0] != 127) //if current position has a backspace in it then
mvprintw(counter+startrow,startcol,"%s",display[counter+scrollstart]);//move to position counter+startrow on y and startcol on x and display text in display area
}
move(row+startrow-scrollstart,col+startcol); // move to end of text
ky=getch(); // text has been displayed now wait for user to press a key
}
switch(ky) // take actions based on pressed key
{
case 27: //escape
exitflag=true; //set exitflag to be true
break;
case KEY_F(2): //f2 key to delete all file contents
memset(text,'\0',maxchars); //make all the contens of file to be null
position=0; //set postion to be zero
scrollstart=0; //set scroll start to be zero
break;
case KEY_F(3): //f3 key to search for strings
getyx(stdscr,y,x);//get current coordinates of cursor
remove_search_marks(text);//remove searchmarks from text
search_string(NULL,text); //goto search function
clr_bottom(); //clear the interactive area below menu
move(y,x); //move back to textbox
break;
case KEY_F(4): //f4 to replace strings
getyx(stdscr,y,x); //get current coordinates of cursor
replace_string(text);//call the function to replace string
clr_bottom();
move(y,x);
break;
case KEY_F(5): //f5 key to save file
getyx(stdscr,y,x);
save_file(text); //call the function save file
clr_bottom();
move(y,x);
break;
case KEY_F(6): //f6 key to count number of words
clr_bottom();
count_words_chars(text); //call the function to count words and chars in text
case KEY_F(7): //f7 key to remove search marks
remove_search_marks(text); //remove search marks
case KEY_HOME: //move to start of current row
if (col) //if current column is not the first column
{
position=0;//set position to be zero
for (col=0; col < row; col++)//traverse until col is less then row
{
position += strlen(display[col]);//move cursor to end of current row in display array
if ((strchr(display[row],'\n') != NULL) || (strchr(display[row],' ') != NULL))//if there is a escape character ' ' or '\n' in current row
position++; // increment position and move to start of the row
}
}
break;
case KEY_END: //move to end of current row
if (col < strlen(display[row])) //if col is less than number of columns in current row
{
position=-1; //set potiion to -1
for (col=0; col <=row; col++) //traverse until col is less than or equal to row (row is position of current row)
{
position+=strlen(display[col]);//set position to be the end of curent row
if ((strchr(display[row],'\n') != NULL) || (strchr(display[row],' ') != NULL)) //if we haev reached enf of row
position++; //increment position so it may move to end of current row
}
}
break;
case KEY_PPAGE: //move to start of text
position=0; //set position to be zero
scrollstart=0; //set scroll start to be zero
break;
case KEY_NPAGE: //move to end of text
position=strlen(text); //set postion to be end of text
for (counter=0; counter < maxrows; counter++) //traverse until counter is less than total number of rows
if(display[counter][0]==127) //if the row at position counter's first character is backspace
break; //then break from loop
scrollstart=counter-displayrows; //else set scroll start to equal counter-displayrows
if (scrollstart < 0) //in case scroll start has decreased to become negative
scrollstart=0; //set it to be zero again
break;
case KEY_LEFT: //move cursor left
if (position) //if position is not zero
position--; //decrease by one
break;
case KEY_RIGHT: //move cursor right
if (position < strlen(text) && (row != maxrows-1 || col < maxcols-1))//if cursor is not already at end or far from end
position++; //increase position by one
break;
case KEY_UP: //move cursor up
if (row) //in case we are not on first row
{
if (col > strlen(display[row-1]))//if current column is greater then length of previous row
position=strlen(display[row-1]); //then set cursor at the end of above row
else
position=col; //else set position to col
ky=0; //set ky=0
for (col=0; col < row-1; col++) //traverse for col less than row above current row
{
position+=strlen(display[col]); //move cursor to end of column
ky+=strlen(display[col]); //move ky to next row
if ((strlen(display[col]) < maxcols) || (text[ky]==' ' && strlen(display[col])==maxcols))//if we are not already at end of row
{
position++; //increment position
ky++; //move to next row
}
}
}
break;
case KEY_DOWN:// move cursor to below row
if (row < maxrows-1) //if it's not last row
if (display[row+1][0] !=127) //if next row is not empty
{
if (col < strlen(display[row+1])) //if col is less than length of next row
position=col; //set position to be col
else
position=strlen(display[row+1]);//set position to be end of above row
ky=0;//set ky=0;
for (col=0; col <= row; col++)//traverse until we reach the current row
{
position+=strlen(display[col]);//move to next row
ky+=strlen(display[col]);//move to next row
if ((strlen(display[col]) < maxcols) || (text[ky]==' ' && strlen(display[col])==maxcols))//if we are not already at end of row
{
position++;
ky++;
}
}
}
break;
case KEY_IC: // insert key
ins=!ins;//invert the insert mode, turn it on if it's on or vice versa
if (ins)
curs_set(2);
else
curs_set(1);
break;
case 330://KEY_DC: // delete key
if (strlen(text))//if text exist
{
strcpy(savetext,text);//save text
memmove(&text[position],&text[position+1],maxchars-position);//move text to left by one character meanwhile eating the one character, search google for function memove and read about it...
}
break;
case KEY_BACKSPACE:// remove text
if (strlen(text) && position)//if text exist and cursor is already not at begiing of text
{
strcpy(savetext,text);//save text
position--;//decrease poition by one basically making cursor go back
memmove(&text[position],&text[position+1],maxchars-position);//move text to left by one character meanwhile eating the one character
}
break;
case 25: // ctrl-y delete entire line
if (display[1][0] != 127)//if there's text on first row
{
position-=col;//move cursor to start of first row
ky=0;//set ky=0
do
{
memmove(&text[position],&text[position+1],maxchars-position);//move text right by one
ky++;//increase ky
}
while (ky < strlen(display[row]));//keep doing it until ky is less than number of columns in current row
}
else
memset(text,'\0',maxchars);//other wise it's already empty
break;
case 10: // return // insert a line by pressing return button
switch (returnhandler)//see what do we want enter to do
{
case 1:// in case return handler==1
if (display[maxrows-1][0] == 127 || display[maxrows-1][0] == '\n')// if display area is not empty
{
memmove(&text[position+1],&text[position],maxchars-position);//move text to right by one, emptying the space for one charectre at potiions
text[position]='\n'; //insert a new row character at position in text
position++;//increase poition
}
break;
case 2:
ky=' ';//insert a space
ungetch(ky);//
break;
case 3:
exitflag=true;//exit
}
break;
default: //in case of any other characters than specified above
if (((permitted==NULL && ky > 31 && ky < 127) || (permitted != NULL && strchr(permitted,ky))) && strlen(text) < maxchars-1 && (row !=maxrows-1 || (strlen(display[maxrows-1]) < maxcols || (ins && (row!=maxrows-1 && col < maxcols )))))
{
if (ins || text[position+1]=='\n' || text[position]== '\n') //in ase insert mode is on or there is no text after this in current row
memmove(&text[position+1],&text[position],maxchars-position);//move text to right by one and add characters
text[position]=ky;//insert current key in text
if (row != maxrows-1 || col < maxcols-1)//in case insert mode is off and we're not at the end of row
position++;//increment position(move cursor to right)
}
}
if(!allowcr)//if isnert mode is allowed
if (text[0]=='\n') //if first char in text is a newline
{
memmove(&text[0],&text[1],maxchars-1);//movetext to left by one
if (position)//if position is not zero
position--;//decrease position
}
}//switch ends here
/*user decided to exit free all assigned memory */
free(original);//free memory of original
free(savetext);//free memory of savetext
free(last_undo);//free memory of last undo, it's not used at all so no need for it
for(scrollstart = 0; scrollstart < maxrows; scrollstart++)//traverse all rows of siplay and free their memory
free(display[scrollstart]);
free(display);//free dispay
/************************/
return 0;
}
char* left(char *string, const int length)
{
if (strlen(string) > length) // if length of string is more than length then add a null to string to shorten its length to length
string[length]='\0';
return string;
}
void malloc_error(void) // in case of mallox error just exit
{
endwin();//end window
fprintf(stderr, "malloc error:out of memory\n");//print error
exit(EXIT_FAILURE);//generate signal for exit and exit
}
/***/
int file_exist(char* path)
{
FILE *fp = fopen(path,"r"); // open file in read mode
if(fp==NULL) // couldn't open mean file not existing
return 0;
fclose(fp); //close file if opened means file exists
return 1;
}
void clr_bottom() // scroll from 29th row to max number of rows to set it to blank spaces,, it basically used to clear the text
{
int i=0, j=0; //counters
int max_y, max_x; // max coordinates we can haev on scren
getmaxyx(stdscr,max_y, max_x);// get maximum coordinates
for(i=29; i<max_y; i++) //start from 29 and traverse unless we rach end of screen
{
for(j=0; j<max_x; j++) //traverse all columns of each row
{
move(i,j); //move to right
addch(' '); //insert a space
}
}
}
int save_file(char* text) //save file
{
char path[200], ch_over, spath='a'; int sp; //path is the path to file, ch_over is just to input a character spath is a condition variablle
int i=0;
FILE* fps; //pointer for file
move(33, 0);//move cursor to lower area
printw("Enter path to save the text: "); // ask for path
while(spath!='\n') // getting path
{
spath=getch(); //get path
sp=(int) spath; //get code verion of pressed key
if((sp>=65 && sp<=90) || (sp>=48 && sp<=57) || (sp>=97 && sp<=122) || sp==95 || sp==46)
{
addch(spath); //if it is an alphanumeric chaacter
path[i]=spath;i++;//add to path variable
}
if(sp==27 )//escape key) // press escape to abort entering path
{
move(33,0); deleteln(); //delete line fromm below area
return 0;
}
}
path[i]='\0';//add null to end of path variable
if(file_exist(path)) // in case file is already there do this
{
move(33, 0);deleteln(); //deleet line form menu
printw("\nFile with this name already exist, Press 'y' to over write?");
ch_over=getch();
addch(ch_over);
if(ch_over=='y')//if user pressed y
{
fps=fopen(path,"w+");//open file
fprintf(fps,"%s",text);//write text to file
fclose(fps);//close file
move(33, 0);deleteln();//delete line in menu
printw("\nFile saved ");
return 1;
}
move(33, 0);deleteln();
printw("\nFile not saved "); //if did not user press y then tell him it's not saved
return 0;
}
fps=fopen(path,"w+"); // file wasn't there open a new file
fprintf(fps,"%s",text); //save text to file
move(33, 0);deleteln(); //delete line from menu
printw("\nFile saved ");//tell user file saved
fclose(fps);//close file
return 1;
}
///////////////////
int insert_string(int pos, char* string, char* data)
{
int i=pos, j=0;
if(strlen(data)==0) // if data has no charcters thendo this
{
for(i=0; i<strlen(string); i++) //traverse string which has to be inserted in data
{
data[i]=string[i]; //append strng to data
}
}
// if data has some text in it already then make space to insert text
else
{
for(i=strlen(data); i>=pos; i--)//keep moving until given position arrives
{
data[i+strlen(string)]=data[i]; //move text to right making space at the required position for string
}
for(i=pos; i<pos+strlen(string); i++, j++)//above loop has made space no isert string in that position
{
if(string[j]!='\0')
data[i]=string[j];
}
}
return 0;
}
int search_string(char *string, char* data)
{
int i=0, j=0, start[100], end[100], n_o_occur=0, maxchars=size;
char ch='a', s_a='n', st[2]="[", en[2]="]";
move(32,0);
if(string==NULL) // if user has not given any string to search then ask him to enter one
{
s_a='y';
string = malloc(500*sizeof(char));
printw("Enter String to search for: ");
while(ch!='\n')
{
ch=getch();
addch(ch);
string[i]=ch;i++;
if(ch==127) //bakspace
{
getyx(stdscr,y,x);
move(y,x-1);
}
if(ch==27 )//escape key)
{
move(33,0); deleteln();
return 0;
}
}
string[i]='\0';
}
int flag=0, len1, len2;
len1 = strlen(string);
len2 = strlen(data);
if (len1 > len2){ // if seach string is greator than data then it's wrong string so exit
return 0;
}
for (i = 0; i <= len2; ++i){ // start loop and traverse thorough data and match string
if (string[0]==data[i]){ // if first character of string is found in data
flag = 1; //set flag to be one
for (j = 1; j<(len1-1) && (i+j)<strlen(data); ++j){ // see if remaning characters are also there then
if (string[j]!=data[i+j]){
flag=0; // all characters were not matched set flag to 0 and start searching in next part of data
break;
}
}
if((flag==1 || (i+j)>strlen(data)) && s_a=='n') // if user is sarching for a string then just tel positio of first rting
{
break;
}
if((flag==1 || (i+j)>strlen(data)) && s_a=='y') // if searching for a string in all data then keep going and insert the search marks [] in text
{
insert_string(i,st,data); insert_string(i+j+1,en,data);i=i+1;
search_marks=true;
}
}
}
if (flag==1){
return i;
}
return -1;
}
int delete_string(int pos, int len, char *data) // delet a string at pos of length len from data
{
int i;
i=pos;
for(i=pos; i<strlen(data)-len; i++) // taraverse here
{
data[i]=data[i+len]; // keep moving backwards
}
data[i]='\0';
return 0;
}
int count_words_chars(char* data)
{
int i=0, wrd_count=0;
for(i=0; i<strlen(data); i++)
{
if(i==0)
wrd_count++;
if(data[i]==' ' || data[i]=='\n') // saecg for new line or space and mark word++
{
wrd_count++;
}
}
move(34,0);
printw("Characters: %d, Words: %d",strlen(data), wrd_count);
return 0;
}
int replace_string(char* data)
{
int pos, i=0, j=0, start[100], end[100],n_o_occur=0, maxchars=size;
char string[500], *replace_with, ch='a';
replace_with=malloc(500*sizeof(char));
move(32, 0);deleteln();
printw("Enter String to replace: "); // take the string to replace
while(ch!='\n')
{
ch=getch();
addch(ch);
if(ch!='\n'){string[i]=ch;i++;}
if(ch==27 )//escape key)
{
move(33,0); deleteln();
return 0;
}
}
string[i]='\0';
ch='a';
move(33, 0);
i=0;printw("Enter replacement string: "); // take the string to replace with
while(ch!='\n')
{
ch=getch();
addch(ch);
if(ch!='\n')
{replace_with[i]=ch;i++;}
if(ch==27 )//escape key)
{
move(33,0); deleteln();
return 0;
}
}
deleteln();
replace_with[i]='\0';
while((pos=search_string(string, data))!=-1) // now search the string to be replaced and get its position
{
delete_string(pos, strlen(string), data); // delete the searched string dfrom its position
insert_string(pos, replace_with, data); // insert the replacement string at that position
}
free(replace_with);
return 0;
}
void remove_search_marks(char* text) // fnd [] marks and remove them
{
int i;
if(search_marks==true) // if search marks exist then remove them and tell search marks don't exist anymore
{
search_marks=false;
for(i=0; i<strlen(text); i++)
{
if(text[i]=='[' || text[i]==']')
{
delete_string(i,1,text);
}
}
}
}
/*****/
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