1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "7ed.h"
#include <stdint.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","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[]) {
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[]) { // doin this test again
long new_line_pos; // The "focus" that the newline will be inserted afterwards
long new_line_pos_temp = 0; // temp
char buf[1024];
int success;
do {
fprintf(stdout, "Create a new line after: ");
if (!fgets(buf, 1024, stdin)) { // take input from user
fprintf(stderr, "Too many characters\n");
break;
}
char *endptr;
new_line_pos_temp = strtol(buf, &endptr, 10);
errno = 0;
if (errno == ERANGE) {
fprintf(stderr, "Sorry, this number is too small or too large.\n");
success = 0;
}
else if (endptr == buf) {
// no character was read
success = 0;
}
else if (*endptr && *endptr != '\n') {
success = 0;
}
else {
success = 1;
}
} while (!success);
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) {
FILE *file;
file = fopen(filename, "a");
fputc('\n', file);
fclose(file);
return 0;
}
}
printf("continuing\n");
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 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;
}
|
