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-rw-r--r--miscutils/bc.c96
1 files changed, 66 insertions, 30 deletions
diff --git a/miscutils/bc.c b/miscutils/bc.c
index 5d5449e..d8fbb6e 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -3431,6 +3431,17 @@ static BC_STATUS zdc_lex_token(BcLex *l)
// l->t.t = BC_LEX_EOF;
// break;
case '\n':
+ // '\n' is BC_LEX_NLINE, not BC_LEX_WHITESPACE
+ // (and "case '\n'" is not just empty here)
+ // only to allow interactive dc have a way to exit
+ // "parse" stage of "parse,execute" loop
+ // on '\n', not on _next_ token (which would mean
+ // command are not executed on pressing <enter>).
+ // IOW: typing "1p<enter>" should print "1" _at once_,
+ // not after some more input.
+ l->t.t = BC_LEX_NLINE;
+ l->newline = true;
+ break;
case '\t':
case '\v':
case '\f':
@@ -4861,12 +4872,16 @@ static BC_STATUS zdc_parse_cond(BcParse *p, uint8_t inst)
s = zbc_lex_next(&p->l);
if (s) RETURN_STATUS(s);
+ // Note that 'else' part can not be on the next line:
+ // echo -e '[1p]sa [2p]sb 2 1>a eb' | dc - OK, prints "2"
+ // echo -e '[1p]sa [2p]sb 2 1>a\neb' | dc - parse error
if (p->l.t.t == BC_LEX_ELSE) {
s = zdc_parse_register(p);
if (s) RETURN_STATUS(s);
s = zbc_lex_next(&p->l);
- } else
+ } else {
bc_parse_push(p, BC_PARSE_STREND);
+ }
RETURN_STATUS(s);
}
@@ -4945,33 +4960,32 @@ static BC_STATUS zdc_parse_token(BcParse *p, BcLexType t)
static BC_STATUS zdc_parse_expr(BcParse *p)
{
- BcLexType t;
-
- dbg_lex_enter("%s:%d entered, p->l.t.t:%d", __func__, __LINE__, p->l.t.t);
- for (;;) {
- BcInst inst;
- BcStatus s;
+ BcInst inst;
+ BcStatus s;
- t = p->l.t.t;
- dbg_lex("%s:%d p->l.t.t:%d", __func__, __LINE__, p->l.t.t);
- if (t == BC_LEX_EOF) break;
+ inst = dc_parse_insts[p->l.t.t];
+ if (inst != BC_INST_INVALID) {
+ bc_parse_push(p, inst);
+ s = zbc_lex_next(&p->l);
+ } else {
+ s = zdc_parse_token(p, p->l.t.t);
+ }
+ RETURN_STATUS(s);
+}
+#define zdc_parse_expr(...) (zdc_parse_expr(__VA_ARGS__) COMMA_SUCCESS)
- inst = dc_parse_insts[t];
- if (inst != BC_INST_INVALID) {
- dbg_lex("%s:%d", __func__, __LINE__);
- bc_parse_push(p, inst);
- s = zbc_lex_next(&p->l);
- } else {
- dbg_lex("%s:%d", __func__, __LINE__);
- s = zdc_parse_token(p, t);
- }
+static BC_STATUS zdc_parse_exprs_until_eof(BcParse *p)
+{
+ dbg_lex_enter("%s:%d entered, p->l.t.t:%d", __func__, __LINE__, p->l.t.t);
+ while (p->l.t.t != BC_LEX_EOF) {
+ BcStatus s = zdc_parse_expr(p);
if (s) RETURN_STATUS(s);
}
dbg_lex_done("%s:%d done", __func__, __LINE__);
RETURN_STATUS(BC_STATUS_SUCCESS);
}
-#define zdc_parse_expr(...) (zdc_parse_expr(__VA_ARGS__) COMMA_SUCCESS)
+#define zdc_parse_exprs_until_eof(...) (zdc_parse_exprs_until_eof(__VA_ARGS__) COMMA_SUCCESS)
#endif // ENABLE_DC
@@ -5182,7 +5196,7 @@ static BC_STATUS zbc_program_read(void)
if (IS_BC) {
IF_BC(s = zbc_parse_expr(&parse, 0));
} else {
- IF_DC(s = zdc_parse_expr(&parse));
+ IF_DC(s = zdc_parse_exprs_until_eof(&parse));
}
if (s) goto exec_err;
@@ -6304,6 +6318,7 @@ static BC_STATUS zdc_program_execStr(char *code, size_t *bgn, bool cond)
f = bc_program_func(fidx);
if (f->code.len == 0) {
+ FILE *sv_input_fp;
BcParse prs;
char *str;
@@ -6311,7 +6326,12 @@ static BC_STATUS zdc_program_execStr(char *code, size_t *bgn, bool cond)
str = *bc_program_str(sidx);
s = zbc_parse_text_init(&prs, str);
if (s) goto err;
- s = zdc_parse_expr(&prs);
+
+ sv_input_fp = G.input_fp;
+ G.input_fp = NULL; // "do not read from input file when <EOL> reached"
+ s = zdc_parse_exprs_until_eof(&prs);
+ G.input_fp = sv_input_fp;
+
if (s) goto err;
if (prs.l.t.t != BC_LEX_EOF) {
s = bc_error_bad_expression();
@@ -6439,12 +6459,15 @@ static BC_STATUS zbc_program_exec(void)
s = zbc_program_pushArray(code, &ip->inst_idx, inst);
break;
case BC_INST_LAST:
+//TODO: this can't happen on dc, right?
+ dbg_exec("BC_INST_LAST:");
r.t = BC_RESULT_LAST;
bc_vec_push(&G.prog.results, &r);
break;
case BC_INST_IBASE:
case BC_INST_SCALE:
case BC_INST_OBASE:
+ dbg_exec("BC_INST_internalvar:");
bc_program_pushGlobal(inst);
break;
case BC_INST_SCALE_FUNC:
@@ -6519,17 +6542,21 @@ static BC_STATUS zbc_program_exec(void)
bc_vec_pop(&G.prog.exestack);
goto read_updated_ip;
case BC_INST_MODEXP:
+ dbg_exec("BC_INST_MODEXP:");
s = zdc_program_modexp();
break;
case BC_INST_DIVMOD:
+ dbg_exec("BC_INST_DIVMOD:");
s = zdc_program_divmod();
break;
case BC_INST_EXECUTE:
case BC_INST_EXEC_COND:
+ dbg_exec("BC_INST_EXEC[_COND]:");
s = zdc_program_execStr(code, &ip->inst_idx, inst == BC_INST_EXEC_COND);
goto read_updated_ip;
case BC_INST_PRINT_STACK: {
size_t idx;
+ dbg_exec("BC_INST_PRINT_STACK:");
for (idx = 0; idx < G.prog.results.len; ++idx) {
s = zbc_program_print(BC_INST_PRINT, idx);
if (s) break;
@@ -6537,12 +6564,15 @@ static BC_STATUS zbc_program_exec(void)
break;
}
case BC_INST_CLEAR_STACK:
+ dbg_exec("BC_INST_CLEAR_STACK:");
bc_vec_pop_all(&G.prog.results);
break;
case BC_INST_STACK_LEN:
+ dbg_exec("BC_INST_STACK_LEN:");
dc_program_stackLen();
break;
case BC_INST_DUPLICATE:
+ dbg_exec("BC_INST_DUPLICATE:");
if (!STACK_HAS_MORE_THAN(&G.prog.results, 0))
RETURN_STATUS(bc_error_stack_has_too_few_elements());
ptr = bc_vec_top(&G.prog.results);
@@ -6551,6 +6581,7 @@ static BC_STATUS zbc_program_exec(void)
break;
case BC_INST_SWAP: {
BcResult *ptr2;
+ dbg_exec("BC_INST_SWAP:");
if (!STACK_HAS_MORE_THAN(&G.prog.results, 1))
RETURN_STATUS(bc_error_stack_has_too_few_elements());
ptr = bc_vec_item_rev(&G.prog.results, 0);
@@ -6561,9 +6592,11 @@ static BC_STATUS zbc_program_exec(void)
break;
}
case BC_INST_ASCIIFY:
+ dbg_exec("BC_INST_ASCIIFY:");
s = zdc_program_asciify();
break;
case BC_INST_PRINT_STREAM:
+ dbg_exec("BC_INST_STREAM:");
s = zdc_program_printStream();
break;
case BC_INST_LOAD:
@@ -6585,6 +6618,7 @@ static BC_STATUS zbc_program_exec(void)
bc_vec_npop(&G.prog.exestack, 2);
goto read_updated_ip;
case BC_INST_NQUIT:
+ dbg_exec("BC_INST_NQUIT:");
s = zdc_program_nquit();
//goto read_updated_ip; - just fall through to it
#endif // ENABLE_DC
@@ -6629,25 +6663,20 @@ static BC_STATUS zbc_vm_process(const char *text)
BcStatus s;
dbg_lex_enter("%s:%d entered", __func__, __LINE__);
- s = zbc_parse_text_init(&G.prs, text);
+ s = zbc_parse_text_init(&G.prs, text); // does the first zbc_lex_next()
if (s) RETURN_STATUS(s);
while (G.prs.l.t.t != BC_LEX_EOF) {
dbg_lex("%s:%d G.prs.l.t.t:%d, parsing...", __func__, __LINE__, G.prs.l.t.t);
if (IS_BC) {
-// FIXME: "eating" of stmt delemiters is coded inconsistently
+// FIXME: "eating" of stmt delimiters is coded inconsistently
// (sometimes zbc_parse_stmt() eats the delimiter, sometimes don't),
// which causes bugs such as "print 1 print 2" erroneously accepted,
// or "print 1 else 2" detecting parse error only after executing
// "print 1" part.
IF_BC(s = zbc_parse_stmt_or_funcdef(&G.prs));
} else {
-#if ENABLE_DC
- if (G.prs.l.t.t == BC_LEX_EOF)
- s = bc_error("end of file");
- else
- s = zdc_parse_expr(&G.prs);
-#endif
+ IF_DC(s = zdc_parse_expr(&G.prs));
}
if (s || G_interrupt) {
bc_parse_reset(&G.prs); // includes bc_program_reset()
@@ -6689,6 +6718,13 @@ static BC_STATUS zbc_vm_process(const char *text)
ip->inst_idx = 0;
IF_BC(bc_vec_pop_all(&f->strs);)
IF_BC(bc_vec_pop_all(&f->consts);)
+ } else {
+ // Most of dc parsing assumes all whitespace,
+ // including '\n', is eaten.
+ if (G.prs.l.t.t == BC_LEX_NLINE) {
+ s = zbc_lex_next(&G.prs.l);
+ if (s) RETURN_STATUS(s);
+ }
}
}
generated by cgit v1.1 at 2024-12-25 16:46:49 +0000