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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "7ed.h"
#include <stdint.h>
int delete_specified_newline(char filename[], long focus) { // special version of write_line that does as the name says
char *line;
size_t start;
int ret = get_line(filename, focus, &line, &start); // get start position of focus
if (ret == 1) {
return EXIT_FAILURE;
}
start = start-1; // decrement by 1 to place start position at the newline
FILE *file;
FILE *temp;
file = fopen(filename,"r"); // Open file
temp = fopen("temp.7ed","w+"); // Open temp file
if (file == NULL || temp == NULL) { // Check if you can open file
fprintf(stderr, "Cannot open file. delete_specified_newline\n");
return 1;
}
fseek(file, 0, SEEK_SET); // go to start of file
size_t counter = 0;
char ch;
for (;; counter++) { // for loop that puts contents of file in to temp
// when counter is equal to start, the buffer with the edited content is written to temp
if (start == counter) { // after that it uses fseek to point temp right after the written content
fseek(temp, start, SEEK_SET); // After that the function keeps writing everything else to temp
fseek(file, start+1, SEEK_SET); // +1 to skip over the newline and thus having it be removed
}
ch = fgetc(file);
if (ch == EOF) {
break;
}
fputc(ch, temp);
}
fseek(temp, 0, SEEK_SET); // reset both files to start at 0 so it doesnt mess with fread and fwrite
fclose(file);
file = fopen(filename, "w"); // open file again to write the rest
if (file == NULL) { // Check if you can open file
fprintf(stderr, "Cannot open file for writing.\n");
return 1;
}
char buffer[BUF_SZ_2];
size_t bytes_read;
while ((bytes_read = fread(buffer, 1, BUF_SZ_2, temp)) > 0) { // Write contents of temp to file
fwrite(buffer, 1, bytes_read, file);
}
free(line);
fclose(file);
fclose(temp);
remove("temp.7ed");
return 0;
}
int write_line(char filename[], long focus, char editbuffer[], size_t editbuffer_size) { // writes text at specified line
char *line;
size_t start;
int ret = get_line(filename, focus, &line, &start); // get start position of focus
if (ret == 1) {
return EXIT_FAILURE;
}
FILE *file;
FILE *temp;
file = fopen(filename,"r"); // Open file
temp = fopen("temp.7ed","w+");
if (file == NULL || temp == NULL) { // Check if you can open file
fprintf(stderr, "Cannot open file. write_line\n");
return 1;
}
fseek(file, start, SEEK_SET);
size_t count = 0;
while (1) {
char c = fgetc(file);
if (c == '\n') {
break; // count the length of the specific line to be replaced
} else if (c == EOF) {
break;
} else {
count++;
}
}
fseek(file, 0, SEEK_SET); // go to start of file
size_t counter = 0;
char ch;
for (;; counter++) { // for loop that puts contents of file in to temp
// when counter is equal to start, the buffer with the edited content is written to temp
if (start == counter) { // after that it uses fseek to point temp right after the written content
fprintf(temp, "%s", editbuffer); // and fseek on file will use count variable to skip the content that is supposed to be replaced
fseek(temp, start+editbuffer_size-1, SEEK_SET); // After that the function keeps writing everything else to temp
fseek(file, start+count, SEEK_SET);
}
ch = fgetc(file);
if (ch == EOF) {
break;
}
fputc(ch, temp);
}
fseek(temp, 0, SEEK_SET); // reset both files to start at 0 so it doesnt mess with fread and fwrite
fclose(file);
file = fopen(filename, "w");
if (file == NULL) { // Check if you can open file
fprintf(stderr, "Cannot open file for writing.\n");
return 1;
}
char buffer[BUF_SZ_2];
size_t bytes_read;
while ((bytes_read = fread(buffer, 1, BUF_SZ_2, temp)) > 0) { // Write contents of temp to file
fwrite(buffer, 1, bytes_read, file);
}
free(line);
fclose(file);
fclose(temp);
remove("temp.7ed");
return 0;
}
int check_end_newline(char filename[]) { // function that checks if a file ends with a newline
FILE *file;
file = fopen(filename, "r");
if (file == NULL) {
fprintf(stderr, "Cannot open file. check_end_newline()\n");
return 1;
}
fseek(file, -1, SEEK_END);
if (fgetc(file) != '\n') {
return -1; // returns -1 if there is not newline at the end
}
fclose(file);
return 0; // returns 0 if there is one
}
int new_line(char filename[], long new_line_pos_temp) { // creates a new line within a file after a specified line number
long new_line_pos;
if (new_line_pos_temp < 0) {
fprintf(stderr, "The new line can not be under 0!\n");
return 1;
} else {
new_line_pos = new_line_pos_temp;
int cen = check_end_newline(filename);
if (cen == -1) {
size_t linecount;
int clif = count_lines_in_file(filename, &linecount);
if (clif == 1) {
return 1;
}
if (linecount == (size_t)new_line_pos) { // if the file ends without a newline and the user wants to put a newline at the end, then this code within the if-statement will do that.
FILE *file;
file = fopen(filename, "a");
if (file == NULL) {
fprintf(stderr, "Cannot open file. new_line()\n");
return 1;
}
fputc('\n', file);
fputc('\n', file);
fclose(file);
return 0;
}
}
char *line; // line is the line before the newline
// line2 is the line right after line
size_t start; // start is the position at the start of line
// start2 is the position at the start of line2
int ret = get_line(filename, new_line_pos+1, &line, &start);
if (ret == 1) {
return 1;
}
size_t len = strlen(line);
char to_be_written[len+2];
to_be_written[0] = '\n';
to_be_written[1] = '\0';
strcat(to_be_written, line);
write_line(filename, new_line_pos+1, to_be_written, len+1);
free(line);
}
return 0;
}
int remove_line_contents(char filename[], long focus) { // removes contents of a specified line without removing the newline
char *line;
size_t start;
int ret = get_line(filename, focus, &line, &start);
if (ret == 1) {
return 1;
}
int cen = check_end_newline(filename); // check if file ends without newline
// check_end_newline returns 0 if ther is a newline
// it returns -1 if ther is none
char editbuffer[1] = {'\0'};
write_line(filename, focus, editbuffer, 1); // remove contents in line
if (cen == -1) { // put newline at end if cen == -1
new_line(filename, focus-1);
}
free(line);
return 0;
}
int editmode(char filename[], uint64_t focus) { // the editing interface
char *line;
size_t start;
int ret = get_line(filename, focus, &line, &start);
if (ret == 1) {
return EXIT_FAILURE;
}
fprintf(stdout, "%s", line); // print line to be edited
free(line);
while (1) {
char editbuffer[BUF_SZ_2];
fprintf(stdout, "(%ld EDIT): ", focus);
char *fgs = fgets(editbuffer, BUF_SZ_2, stdin);
if (fgs == NULL) {
return 0;
}
if (editbuffer[0] == '\n') {
fprintf(stdout, "No changes\n");
return 0;
}
fprintf(stdout, "Do you want to write the changes?\n");
int yesno = choice();
if (yesno == 1) {
return 0;
}
size_t editbuffer_size = strlen(editbuffer);
write_line(filename, focus, editbuffer, editbuffer_size);
return 0;
}
return EXIT_SUCCESS;
}
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