1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("");
void
initialise_parser_context(struct parser_context *ctx)
{
memset(ctx, 0, sizeof(*ctx));
ctx->preparser_line_number = 1;
ctx->tokeniser_line_number = 1;
ctx->mode_stack = ecalloc(1, sizeof(*ctx->mode_stack));
ctx->mode_stack->mode = NORMAL_MODE;
ctx->mode_stack->she_is_comment = 1;
ctx->parser_state = ecalloc(1, sizeof(*ctx->parser_state));
ctx->here_documents_next = &ctx->here_documents_first;
}
int
main(int argc, char *argv[])
{
struct parser_context ctx;
char *buffer = NULL;
size_t buffer_size = 0;
size_t buffer_head = 0;
size_t buffer_tail = 0;
ssize_t r;
size_t n, nremoved;
ARGBEGIN {
default:
usage();
} ARGEND;
if (argc)
usage();
initialise_parser_context(&ctx);
ctx.tty_input = isatty(STDIN_FILENO);
if (ctx.tty_input)
weprintf("apsh is currently not implemented to be interactive\n");
for (;;) {
if (buffer_size - buffer_head < PARSE_RINGBUFFER_MIN_AVAILABLE) {
if (buffer_tail && buffer_head - buffer_tail <= buffer_tail) {
memcpy(&buffer[0], &buffer[buffer_tail], buffer_head - buffer_tail);
buffer_head -= buffer_tail;
buffer_tail = 0;
}
if (buffer_size - buffer_head < PARSE_RINGBUFFER_MIN_AVAILABLE)
buffer = erealloc(buffer, buffer_size += PARSE_RINGBUFFER_INCREASE_SIZE);
}
r = read(STDIN_FILENO, &buffer[buffer_head], buffer_size - buffer_head);
if (r <= 0) {
if (!r)
break;
eprintf("read <stdin>:");
}
n = (size_t)r;
buffer_head += n;
buffer_tail += n = parse(&ctx, &buffer[buffer_tail], buffer_head - buffer_tail, &nremoved);
buffer_head -= nremoved;
}
ctx.end_of_file_reached = 1;
buffer_tail += parse(&ctx, &buffer[buffer_tail], buffer_head - buffer_tail, &nremoved);
buffer_head -= nremoved;
if (buffer_tail != buffer_head || ctx.premature_end_of_file)
eprintf("premature end of file reached\n");
free(buffer);
return 0;
}
|
