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Can insert, delete, and replace stored lines.

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Lawrence Kesteloot 2018-08-01 15:08:56 -07:00
parent ca49e6e511
commit 38a15160ed
1 changed files with 28 additions and 15 deletions
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43
main.c
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@ -474,17 +474,18 @@ static void process_input_buffer() {
// Return line to replace or delete, or location to insert new line.
uint8_t *line = find_line(line_number);
uint8_t *next_line = get_next_line(line);
uint8_t *end_of_program = get_end_of_program(line);
int16_t adjustment = 0;
if (next_line == 0 || get_line_number(line) != line_number) {
// Didn't find line. Insert it here.
uint8_t *end_of_program = get_end_of_program(line);
// Next pointer, line number, line, and nul.
int buffer_length = strlen(g_input_buffer);
int line_length = 4 + buffer_length + 1;
uint8_t buffer_length = strlen(g_input_buffer);
adjustment = 4 + buffer_length + 1;
// Shift rest of program over.
memmove(line + line_length, line, end_of_program - line);
memmove(line + adjustment, line, end_of_program - line);
// Next line. Point to yourself initially, we'll adjust below.
*((uint8_t **) line) = line;
@ -494,24 +495,36 @@ static void process_input_buffer() {
// Buffer and nul.
memmove(line + 4, g_input_buffer, buffer_length + 1);
// Adjust all the next pointers.
while ((next_line = get_next_line(line)) != 0) {
// Adjust by the amount we inserted.
next_line += line_length;
*((uint8_t **) line) = next_line;
line = next_line;
}
} else {
// Found line.
if (g_input_buffer[0] == '\0') {
// Empty line, delete old one.
print("Deletion not handled\n");
// Adjustment is negative.
adjustment = line - next_line;
memmove(line, next_line, end_of_program - next_line);
} else {
// Replace line.
print("Replacement not handled\n");
// Compute adjustment.
uint8_t buffer_length = strlen(g_input_buffer);
adjustment = line - next_line + 4 + buffer_length + 1;
memmove(next_line + adjustment, next_line, end_of_program - next_line);
// Buffer and nul.
memmove(line + 4, g_input_buffer, buffer_length + 1);
}
}
if (adjustment != 0) {
// Adjust all the next pointers.
while ((next_line = get_next_line(line)) != 0) {
// Adjust by the amount we inserted or deleted.
next_line += adjustment;
*((uint8_t **) line) = next_line;
line = next_line;
}
}
}