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Add hard-coded print statement.

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This commit is contained in:
Lawrence Kesteloot 2018-07-31 23:19:15 -07:00
parent 655b397d86
commit 3260180fb7
1 changed files with 18 additions and 7 deletions
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25
main.c
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@ -109,6 +109,10 @@ static void print(unsigned char *s) {
}
}
static void print_statement() {
print("Hello world!\n");
}
/**
* If a starts with string b, returns the position in a after b. Else returns null.
*/
@ -175,7 +179,7 @@ static void process_input_buffer() {
char done;
input_buffer[input_buffer_length] = '\0';
s = skip_whitespace(input_buffer);
s = input_buffer;
// Compile the line of BASIC.
binary_length = 0;
@ -186,25 +190,32 @@ static void process_input_buffer() {
// Default to being done after one command.
done = 1;
if (*s == '\0') {
// Nothing.
s = skip_whitespace(s);
if (*s == '\0' || *s == ':') {
// Empty statement.
} else if ((after = skip_over(s, "HOME")) != 0) {
s = after;
add_call(home);
} else if ((after = skip_over(s, "PRINT")) != 0) {
s = after;
// TODO: Parse expression.
add_call(print_statement);
} else {
error = 1;
}
// Now we're at the end of our instruction.
// Now we're at the end of our statement.
if (!error) {
s = skip_whitespace(after);
s = skip_whitespace(s);
if (*s == ':') {
// Skip colon.
s += 1;
// Next instruction.
// Next statement.
done = 0;
} else if (*s != '\0') {
// Junk at the end of the instruction.
// Junk at the end of the statement.
error = 1;
}
}