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LibGUI: Make TextEditor write a trailing newline to non-empty files

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Fixes #4801.
This commit is contained in:
Andreas Kling 2021-02-15 18:02:33 +01:00
parent a048f46be5
commit 7f616449ec
2 changed files with 23 additions and 14 deletions
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32
Userland/Libraries/LibGUI/TextEditor.cpp
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@ -1060,19 +1060,25 @@ bool TextEditor::write_to_file(const String& path)
ScopeGuard fd_guard = [fd] { close(fd); };
// Compute the final file size and ftruncate() to make writing fast.
// FIXME: Remove this once the kernel is smart enough to do this instead.
off_t file_size = 0;
for (size_t i = 0; i < line_count(); ++i)
file_size += line(i).length();
file_size += line_count() - 1;
if (line_count() == 1 && line(0).is_empty()) {
// Truncate to zero.
} else {
// Compute the final file size and ftruncate() to make writing fast.
// FIXME: Remove this once the kernel is smart enough to do this instead.
for (size_t i = 0; i < line_count(); ++i)
file_size += line(i).length();
file_size += line_count();
}
int rc = ftruncate(fd, file_size);
if (rc < 0) {
if (ftruncate(fd, file_size) < 0) {
perror("ftruncate");
return false;
}
if (file_size == 0)
return true;
for (size_t i = 0; i < line_count(); ++i) {
auto& line = this->line(i);
if (line.length()) {
@ -1083,13 +1089,11 @@ bool TextEditor::write_to_file(const String& path)
return false;
}
}
if (i != line_count() - 1) {
char ch = '\n';
ssize_t nwritten = write(fd, &ch, 1);
if (nwritten != 1) {
perror("write");
return false;
}
char ch = '\n';
ssize_t nwritten = write(fd, &ch, 1);
if (nwritten != 1) {
perror("write");
return false;
}
}