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bc: fix EOF handling in bc_program_read()

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$ bc -q
read()
2^D^D2
     ^ prints the result of read()'ed expression

function                                             old     new   delta
zbc_program_print                                    629     642     +13
bc_program_read                                      322     312     -10
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 13/-10)              Total: 3 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-12-11 22:26:38 +01:00
parent 2c6f563216
commit 4dd3652c2f
1 changed files with 11 additions and 9 deletions
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20
miscutils/bc.c
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@ -1358,6 +1358,8 @@ static int push_input_byte(BcVec *vec, char c)
}
// This is not a "z" function: can also return BC_STATUS_EOF
// Can return success (0) or BC_STATUS_EOF.
// Exits with error message if read error is detected.
static BcStatus bc_read_line(BcVec *vec)
{
BcStatus s;
@ -5523,7 +5525,7 @@ static BcStatus bc_program_read(void)
G.prog.file = NULL;
s = bc_read_line(&buf);
if (s) goto io_err;
//if (s) goto io_err; - wrong, nonzero return means EOF, not error
common_parse_init(&parse, BC_PROG_READ);
bc_lex_file(&parse.l);
@ -5549,9 +5551,9 @@ static BcStatus bc_program_read(void)
bc_vec_push(&G.prog.stack, &ip);
exec_err:
G.prog.file = sv_file;
bc_parse_free(&parse);
io_err:
//io_err:
G.prog.file = sv_file;
bc_vec_free(&buf);
return s;
}
@ -7171,8 +7173,8 @@ static BcStatus bc_vm_stdin(void)
{
BcStatus s;
BcVec buf, buffer;
size_t len, i, str = 0;
bool comment = false;
size_t str;
bool comment;
G.prog.file = NULL;
bc_lex_file(&G.prs.l);
@ -7185,12 +7187,13 @@ static BcStatus bc_vm_stdin(void)
// with a backslash to the parser. The reason for that is because the parser
// treats a backslash+newline combo as whitespace, per the bc spec. In that
// case, and for strings and comments, the parser will expect more stuff.
comment = false;
str = 0;
while ((s = bc_read_line(&buf)) == BC_STATUS_SUCCESS) {
size_t len;
char *string = buf.v;
len = buf.len - 1;
if (len == 1) {
if (str && buf.v[0] == G.send)
str -= 1;
@ -7198,9 +7201,8 @@ static BcStatus bc_vm_stdin(void)
str += 1;
}
else if (len > 1 || comment) {
size_t i;
for (i = 0; i < len; ++i) {
bool notend = len > i + 1;
char c = string[i];