diff options
Diffstat (limited to 'src/bootstrap/main.c')
-rwxr-xr-x | src/bootstrap/main.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/bootstrap/main.c b/src/bootstrap/main.c new file mode 100755 index 0000000..861c206 --- /dev/null +++ b/src/bootstrap/main.c | |||
@@ -0,0 +1,61 @@ | |||
1 | #include <stdio.h> | ||
2 | |||
3 | #include "shorthand.h" | ||
4 | |||
5 | typedef struct StringView { | ||
6 | char *start; | ||
7 | size_t n; | ||
8 | } StringView; | ||
9 | |||
10 | void | ||
11 | sv_write(StringView sv) { | ||
12 | for (size_t i = 0; i < sv.n; i++) { | ||
13 | putchar(sv.start[i]); | ||
14 | } | ||
15 | } | ||
16 | |||
17 | StringView | ||
18 | read_line(void) { | ||
19 | #define RL_BUF_SIZE 1024 | ||
20 | static char readline_buf[RL_BUF_SIZE]; | ||
21 | |||
22 | // Clear buffer. | ||
23 | for (size_t i = 0; i < RL_BUF_SIZE; i++) { | ||
24 | readline_buf[i] = 0; | ||
25 | } | ||
26 | |||
27 | // Barebones readline implementation. | ||
28 | size_t n = 0; | ||
29 | char c; | ||
30 | while ((c = getchar()) != '\n') { | ||
31 | if (c == '\b') { | ||
32 | readline_buf[n] = '\0'; | ||
33 | n--; | ||
34 | } else if (((u8)c >= 0x20 && (u8)c <= 0x7F) && n < RL_BUF_SIZE) { | ||
35 | readline_buf[n] = c; | ||
36 | n++; | ||
37 | } | ||
38 | } | ||
39 | |||
40 | return (StringView){.start = (char *)&readline_buf, .n = n}; | ||
41 | } | ||
42 | |||
43 | void | ||
44 | display(StringView sv) { | ||
45 | if (sv.n != 0) { | ||
46 | sv_write(sv); | ||
47 | printf("\n"); | ||
48 | } | ||
49 | } | ||
50 | |||
51 | #define REPL_PROMPT "bdl> " | ||
52 | |||
53 | int | ||
54 | main(void) { | ||
55 | printf("BDL REPL (Press Ctrl-C to exit)\n"); | ||
56 | while (true) { | ||
57 | printf(REPL_PROMPT); | ||
58 | display(read_line()); | ||
59 | } | ||
60 | return 0; | ||
61 | } | ||