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proj1.c
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proj1.c
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/*
* Soubor: proj1.c
* Predmet: Zaklady programovani (IZP) -- FIT VUT
* Projekt: Jednoduchý textový editor
* Autor: Tomas Beranek (xberan46)
* Email: xberan46@stud.fit.vutbr.cz
* Datum: 25.10.2018
*
* Popis: Jednoduchy textovy editor, ktery nacita vstupni text ze stdin a prikazy pro upravu
* textu ze souboru, ktery je predan jako 1. argument programu
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define CHARS_ON_LINE 1010
enum err
{
SUCCESS = 0,
ERR_FILE_NOT_OPENED = -1,
ERR_FILE_NOT_CLOSED = -2,
ERR_WRONG_FORMAT_OF_COMMAND = 1,
ERR_UNKNOWN_COMMAND = 2,
};
void command_b(char input[CHARS_ON_LINE], char command[CHARS_ON_LINE]);
void command_i(char command[CHARS_ON_LINE]);
void command_r(char input[CHARS_ON_LINE]);
int command_q(char input[CHARS_ON_LINE], FILE* f_command, unsigned int change);
void command_a(char input[CHARS_ON_LINE], char command[CHARS_ON_LINE]);
int command_g(FILE* f_command, char file_name[100], char command[CHARS_ON_LINE]);
void print_all(char input[CHARS_ON_LINE]);
int command_n(char input[CHARS_ON_LINE], char command[CHARS_ON_LINE], FILE* f_command);
int command_d(char input[CHARS_ON_LINE], char command[CHARS_ON_LINE], FILE* f_command);
int main(int argc, char *argv[])
{
//pokud je pocet argumentu mene nebo vice nez 2, program vypise svuj popis a ukonci se
if (argc !=2 )
{
printf("Zadejte prave 1 argument s adresou souboru s prikazy!\n");
return SUCCESS;
}
//otevreni souboru s prikazy a kontrola otevreni
FILE *f_command = fopen(argv[1], "r");
if (f_command == NULL)
{
fprintf(stderr, "ERR_FILE_NOT_OPENED\n");
return ERR_FILE_NOT_OPENED;
}
char input[CHARS_ON_LINE]; //aktualni radek
char command[CHARS_ON_LINE]; //aktualni prikaz
int result; //informace o zpusobu ukonceni funkce
unsigned int change = 0; //informace o zmene aktualniho radku
//vymazani retezcu command a input
memcpy(command, "", 2);
memcpy(input, "", 2);
//nacteni prvniho radku ze vstupu, pokud neni zadan, ukonci program
if ((fgets(input, CHARS_ON_LINE, stdin)) == NULL)
{
//zavreni souboru s prikazy a overeni zavreni
if (fclose(f_command) == EOF)
{
fprintf(stderr, "ERR_FILE_NOT_CLOSED\n");
return ERR_FILE_NOT_CLOSED;
}
return SUCCESS;
}
//nacita radky s prikazy dokud nedojde na konec
while ((fgets(command, CHARS_ON_LINE, f_command)) != NULL)
{
//pokud neni po prikazu odrakovani, prida jej
if (command[strlen(command) - 1] != '\n')
command[strlen(command)] = '\n';
//podle 0. znaku z command rozlisuje jednotlive prikazy
switch (command[0])
{
//prikaz "bCONTENT", pred aktualni radek prida CONTENT
case 'b':
command_b(input, command);
change++;
break;
//prikaz "iCONTENT", pred aktualni radek vlozi radek s obsahem CONTENT
case 'i':
command_i(command);
change++;
break;
// prikaz "dN" vymaze N aktualnich radku
case 'd':
result = command_d(input, command, f_command);
if (result != 10)
switch (result)
{
case SUCCESS:
return SUCCESS;
break;
case ERR_WRONG_FORMAT_OF_COMMAND:
fprintf(stderr, "ERR_WRONG_FORMAT_OF_COMMAND\n");
return ERR_WRONG_FORMAT_OF_COMMAND;
break;
case ERR_FILE_NOT_CLOSED:
fprintf(stderr, "ERR_FILE_NOT_CLOSED\n");
return ERR_FILE_NOT_CLOSED;
break;
}
change = 0;
break;
//prikaz "r" odstrani znak konce radku
case 'r':
command_r(input);
change++;
break;
//prikaz "nN" vytiskne N aktualnich radku
case 'n':
result = command_n(input, command, f_command);
if (result != 10)
switch (result)
{
case SUCCESS:
return SUCCESS;
break;
case ERR_WRONG_FORMAT_OF_COMMAND:
fprintf(stderr, "ERR_WRONG_FORMAT_OF_COMMAND\n");
return ERR_WRONG_FORMAT_OF_COMMAND;
break;
case ERR_FILE_NOT_CLOSED:
fprintf(stderr, "ERR_FILE_NOT_CLOSED\n");
return ERR_FILE_NOT_CLOSED;
break;
}
change = 0;
break;
//prikaz "q" ukonci editaci (program)
case 'q':
return command_q(input, f_command, change);
break;
//prikaz "aCONTENT" za aktualni radek prida CONTENT
case 'a':
command_a(input, command);
change++;
break;
//prikaz "gX" preskoci s aktualnim prikazem pro editaci na Xty prikaz
case 'g':
{
//pokud command_q vrati neco jineho nez 0, program se ukonci s prislusnou chybovou hlaskou a jejim kodem
result = command_g(f_command, argv[1], command);
if (result != 0)
switch (result)
{
case ERR_WRONG_FORMAT_OF_COMMAND:
fprintf(stderr, "ERR_WRONG_FORMAT_OF_COMMAND\n");
return ERR_WRONG_FORMAT_OF_COMMAND;
break;
case ERR_FILE_NOT_CLOSED:
fprintf(stderr, "ERR_FILE_NOT_CLOSED\n");
return ERR_FILE_NOT_CLOSED;
break;
case ERR_FILE_NOT_OPENED:
fprintf(stderr, "ERR_FILE_NOT_OPENED\n");
return ERR_FILE_NOT_OPENED;
break;
}
}
break;
//prikaz "e" prida na konec aktualniho radku '\n'
case 'e':
input[strlen(input)] = '\n';
change++;
break;
//pri nacteni neznameho prikazu vypise chybovou hlasku s prislusnym kodem
default:
fprintf(stderr, "ERR_UNKNOWN_COMMAND\n");
return ERR_UNKNOWN_COMMAND;
break;
}
//pred novym nactenim retezce command jej vymaze
memcpy(command, "", 2);
}
//vytiskne zbyvajici radky ze vstupu
print_all(input);
//zavreni souboru s prikazy a overeni zavreni
if (fclose(f_command) == EOF)
{
fprintf(stderr, "ERR_FILE_NOT_CLOSED\n");
return ERR_FILE_NOT_CLOSED;
}
return SUCCESS;
}
void print_all(char input[CHARS_ON_LINE])
{
//vytiskne aktualni radek
printf("%s", input);
//tiskne zbyvajici radky
while(fgets(input, CHARS_ON_LINE, stdin) != NULL)
{
printf("%s", input);
}
//pokud neni input ukoncen znakem '\n', prida jej
if (input[strlen(input) - 1] != '\n')
printf("\n");
}
void command_b(char input[CHARS_ON_LINE], char command[CHARS_ON_LINE])
{
char content[CHARS_ON_LINE];
char copy[CHARS_ON_LINE];
//vymazani retezcu input a copy
memcpy(content, "", 2);
memcpy(copy, "", 2);
//nacte command bez prvniho posledniho znaku do retezce content
unsigned int i = 1;
while (command[i] != '\n')
{
content[i-1] = command[i];
i++;
}
//do content nacita znaky z command od druheho do predposledniho, zbyle nastavi na '\0'
for (i = 1; i < CHARS_ON_LINE; i++)
{
if (i <= (strlen(command) - 3))
content[i - 1] = command[i];
else
content[i] = '\0';
}
//pocet znaku v retezci input po ukonceni prikazu "bCONTENT"
unsigned count = strlen(content) + strlen(input);
//zkopiruje nejdrive content a potom input do copy
for (i = 0; i < count; i++)
{
if (i < strlen(content))
{
copy[i] = content[i];
}
else
{
copy[i] = input[i - strlen(content)];
}
}
//vymazani retezce input
memcpy(input, "", 2);
//zkopiruje copy do input
for (i = 0; i < CHARS_ON_LINE; i++)
{
if (i < count)
{
input[i] = copy[i];
}
else
{
input[i] = '\0';
}
}
return;
}
void command_i(char command[CHARS_ON_LINE])
{
//vypise command bez prvniho znaku na standartni vystup
unsigned int i = 1;
while (command[i] != '\0')
{
printf("%c", command[i]);
i++;
}
return;
}
void command_r(char input[CHARS_ON_LINE])
{
if (input[strlen(input) - 1] == '\n') //pokud je posledni znak '\n'
input[strlen(input) - 1] = '\0'; //posledni znak nastavi na '\0'
return;
}
int command_q(char input[CHARS_ON_LINE], FILE* f_command, unsigned int change)
{
if (input[strlen(input) - 1] != '\n')
input[strlen(input)] = '\n';
//pokud byla provedena zmena retezce input, tak jej vytiskne
if (change != 0)
printf("%s", input);
//zavreni souboru s prikazy, pri chybnem zavreni vraci chybovou hlasku s prislusnym kodem, jinak se uspesne ukonci
if (fclose(f_command) == EOF)
{
fprintf(stderr, "ERR_FILE_NOT_CLOSED\n");
return ERR_FILE_NOT_CLOSED;
}
return SUCCESS;
}
void command_a(char input[CHARS_ON_LINE], char command[CHARS_ON_LINE])
{
char content[CHARS_ON_LINE];
char copy[CHARS_ON_LINE];
//vymazani retezcu content a copy
memcpy(content, "", 2);
memcpy(copy, "", 2);
//nacte command bez prvniho a posledniho znaku do content
unsigned int i = 1;
while (command[i] != '\n')
{
content[i-1] = command[i];
i++;
}
//znaky ktere nepatri do content nastavi na '\0'
for (i = 0; i < CHARS_ON_LINE; i++)
{
if (i > (strlen(command) - 3))
content[i] = '\0';
}
//pokud aktualni radek obsahuje konec radku c=0, jinak c=1
int c;
if (input[strlen(input) - 1] == '\n')
c = 0;
else
c = 1;
//pocet znaku v obou retezcich i s odrakovanim
unsigned int count = strlen(content) + strlen(input) + c;
//zkopiruje nejdrive input a potom content do copy
for (i = 0; i < (count - 1); i++)
{
if (i < (strlen(input) - 1 + c))
{
copy[i] = input[i];
}
else
{
copy[i] = content[i - (strlen(input) - 1 + c)];
}
}
//vymazani input
memcpy(input, "", 2);
//zkopiruje copy do input
for (i = 0; i < CHARS_ON_LINE; i++)
{
//kopiruje copy do input
if (i < count - 1)
{
input[i] = copy[i];
}
else
{
//na konec prida znak '\n'
if (i == (count -1))
{
input[i] = '\n';
}
//zbytek nastavi na '\0'
else
{
input[i] = '\0';
}
}
}
return;
}
int command_g(FILE* f_command, char file_name[100], char command[CHARS_ON_LINE])
{
unsigned int count = 0;
unsigned int i;
//pokud command neobsahuje cislo nebo cislo zacina '0' vypise chybovou hlasku s prislusnym kodem
if ((strlen(command) <= 2) || (command[1] == '0'))
return ERR_WRONG_FORMAT_OF_COMMAND;
//prevede cislo z retezce na int a ulozi jej do count
for ( i = 1; command[i] != '\n'; i++)
{
if (((command[i] - 48) < 0) && ((command[i] - 48) > 9)) //pokud N neni tvoreno z cislic, vypise chybovou hlasku a prislusny kod
{
return ERR_WRONG_FORMAT_OF_COMMAND;
}
count = 10*count + (command[i] - 48); //prevod cislic z retezce na cislo
}
//zavreni souboru s prikazy a overeni zavreni
if (fclose(f_command) == EOF)
return ERR_FILE_NOT_CLOSED;
//otevreni souboru s prikazy a kontrola otevreni
if ((f_command = fopen(file_name, "r")) == NULL)
return ERR_FILE_NOT_OPENED;
//nacita (count - 1)krat prikaz a tim jej premaze
if (count != 1)
for (i = 0; i < (count - 1); i++)
{
memcpy(command, "", 2);
if (fgets(command, CHARS_ON_LINE, f_command) == NULL)
return ERR_WRONG_FORMAT_OF_COMMAND;
}
return 0;
}
int command_n(char input[CHARS_ON_LINE], char command[CHARS_ON_LINE], FILE* f_command)
{
unsigned int count = 0;
unsigned int i;
//pokud N zacina '0' program se ukonci
if (command[1] == '0')
return ERR_WRONG_FORMAT_OF_COMMAND;
//pokud prikaz neobsahuje N tak count = 1
if (strlen(command) <= 2)
{
count = 1;
}
//pokud prikaz obsahuje N, prevede jej na cislo a ulozi do count
else
{
for (i = 1; command[i] != '\n'; i++)
{
if (((command[i] - 48) < 0) && ((command[i] - 48) > 9)) //testovani zda je N je tvoreno z cislic
return ERR_WRONG_FORMAT_OF_COMMAND;
count = 10*count + (command[i] - 48); //prevod cislic z retezce na cislo
}
}
//Nkrat opakuje vypsani a nacteni aktualniho radku
for (i = 0; i < count; i++)
{
printf("%s", input);
//pred nactenim retezce input jej vymaze
memcpy(input, "", 1);
if (fgets(input, CHARS_ON_LINE, stdin) == NULL) //pokud je soubor prazdny ukonci editaci
{
//zavreni souboru s prikazy a overeni zavreni
if (fclose(f_command) == EOF)
return ERR_FILE_NOT_CLOSED;
return SUCCESS;
}
}
//vraci jinou hodnotu nez jsou chybove kody
return 10;
}
int command_d(char input[CHARS_ON_LINE], char command[CHARS_ON_LINE], FILE* f_command)
{
//pocet preskocenych radku - count
unsigned int count = 0;
unsigned int i;
//pokud N zacina '0' program se ukonci
if (command[1] == '0')
return ERR_WRONG_FORMAT_OF_COMMAND;
//pokud prikaz neobsahuje N tak count = 1
if (strlen(command) <= 2)
{
count = 1;
}
//pokud prikaz obsahuje N, prevede jej na cislo a ulozi do count
else
{
for (i = 1; command[i] != '\n'; i++)
{
if (((command[i] - 48) < 0) && ((command[i] - 48) > 9)) //testovani zda je N je tvoreno z cislic
return ERR_WRONG_FORMAT_OF_COMMAND;
count = 10*count + (command[i] - 48); //prevod cislic z retezce na cislo
}
}
//Nkrat opakuje nacteni aktualniho radku
for (i = 0; i < count; i++)
{
memcpy(input, "", 1);
if (fgets(input, CHARS_ON_LINE, stdin) == NULL) //pokud je soubor prazdny ukonci editaci
{
//zavreni souboru s prikazy a overeni zavreni
if (fclose(f_command) == EOF)
return ERR_FILE_NOT_CLOSED;
return SUCCESS;
}
}
return 10;
}