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Backspacing at the start of a line.

This commit is contained in:
Saumya Bhatnagar 2018-05-31 05:38:47 +05:30
parent e9954b62a4
commit 846f22ccd7
2 changed files with 37 additions and 4 deletions
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BIN
editor
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41
editor.c
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@ -279,7 +279,7 @@ void editorRowInsertChar(editorrow* erow, int at, char c) {
}
void editorRowDelChar(editorrow* erow, int at) {
if (at < 0 || at > erow->length) {
if (at < 0 || at >= erow->length) {
return;
}
@ -289,6 +289,31 @@ void editorRowDelChar(editorrow* erow, int at) {
E.dirty++;
}
void editorFreeRow(editorrow *row) {
free(row->text);
free(row->render);
}
void editorDelRow(int at) {
if (at < 0 || at >= E.numrows) {
return;
}
editorFreeRow(&E.erow[at]);
memcpy(&E.erow[at], &E.erow[at+1], sizeof(editorrow) * (E.numrows - at - 1));
E.numrows--;
E.dirty++;
}
void editorRowAppendString(editorrow * row, char* s, size_t len) {
row->text = realloc(row->text, row->length + len + 1); // +1 for null char
memcpy(&row->text[row->length], s, len);
row->length += len;
row->text[row->length] = '\0';
editorUpdateRow(row);
E.dirty++;
}
/*** editor operations ***/
void editorInsertChar(int c) {
@ -301,12 +326,20 @@ void editorInsertChar(int c) {
}
void editorDelChar() {
if (E.cursorY == E.screenrows) {
if (E.cursorY == E.screenrows || (E.cursorX == 0 && E.cursorY == 0)) {
return;
}
editorRowDelChar(&E.erow[E.cursorY], E.cursorX-1);
E.cursorX--;
editorrow *row = &E.erow[E.cursorY];
if (E.cursorX > 0) {
editorRowDelChar(row, E.cursorX-1);
E.cursorX--;
} else if (E.cursorX == 0) {
E.cursorX = E.erow[E.cursorY-1].length;
editorRowAppendString(&E.erow[E.cursorY-1], row->text, row->length);
editorDelRow(E.cursorY);
E.cursorY--;
}
}
/*** file I/O ***/