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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "7ed.h"
int write_line(char filename[], long focus, char editbuffer[], size_t editbuffer_size) {
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","r+");
if (file == NULL || temp == NULL) { // Check if you can open file
fprintf(stderr, "Cannot open file.\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
fseek(file, 0, SEEK_SET);
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);
return 0;
}
int editmode(char filename[], long focus) {
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);
fgets(editbuffer, BUF_SZ_2, stdin);
if (editbuffer[0] == '\n') { continue; }
fprintf(stdout, "Do you want to write the changes?\n");
int yesno = CHOICE();
if (yesno == 1) {
printf("N\n");
return 0;
}
size_t editbuffer_size = strlen(editbuffer);
write_line(filename, focus, editbuffer, editbuffer_size);
return 0;
}
return EXIT_SUCCESS;
}
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