diff options
| -rw-r--r-- | miscutils/bc.c | 49 |
1 files changed, 39 insertions, 10 deletions
diff --git a/miscutils/bc.c b/miscutils/bc.c index 7c8edcf..8b44d44 100644 --- a/miscutils/bc.c +++ b/miscutils/bc.c @@ -711,6 +711,7 @@ dc_LEX_to_INST[] = { // starts at XC_LEX_OP_POWER // corresponding XC/DC_L typedef struct BcLex { const char *buf; + const char *lex_next_at; // last lex_next() was called at this string size_t i; size_t line; size_t len; @@ -2990,9 +2991,11 @@ static BC_STATUS zbc_lex_next(BcLex *l) } // here it's guaranteed that l->i is below l->len } + l->lex_next_at = l->buf + l->i; dbg_lex("next string to parse:'%.*s'", - (int)(strchrnul(l->buf + l->i, '\n') - (l->buf + l->i)), - l->buf + l->i); + (int)(strchrnul(l->lex_next_at, '\n') - l->lex_next_at), + l->lex_next_at + ); if (IS_BC) { IF_BC(s = zbc_lex_token(l)); } else { @@ -6756,13 +6759,38 @@ static BC_STATUS zbc_vm_process(const char *text) dbg_lex("%s:%d G.prs.l.lex:%d, parsing...", __func__, __LINE__, G.prs.l.lex); if (IS_BC) { -// 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)); +#if ENABLE_BC + s = zbc_parse_stmt_or_funcdef(&G.prs); + if (s) goto err; + + // Check that next token is not bogus, and skip over + // stmt delimiter(s) - newlines and semicolons + s = 1; // s == 1 on first iteration only + for (;;) { + if (G.prs.l.lex == XC_LEX_EOF) + goto execute; // this goto avoids resetting 's' to zero + if (G.prs.l.lex != BC_LEX_SCOLON + && G.prs.l.lex != XC_LEX_NLINE + ) { + const char *err_at; + // Not newline and not semicolon + if (s == 0) // saw at least one NL/semicolon before it? + break; // yes, good +//TODO: commolalize for other parse errors: + err_at = G.prs.l.lex_next_at ? G.prs.l.lex_next_at : "UNKNOWN"; + bc_error_fmt("bad statement terminator at '%.*s'", + (int)(strchrnul(err_at, '\n') - err_at), + err_at + ); + goto err; + } + // NL or semicolon: skip it, set s = 0, repeat + s = zbc_lex_next(&G.prs.l); + if (s) goto err; + } +#endif } else { +#if ENABLE_DC // Most of dc parsing assumes all whitespace, // including '\n', is eaten. while (G.prs.l.lex == XC_LEX_NLINE) { @@ -6771,14 +6799,15 @@ static BC_STATUS zbc_vm_process(const char *text) if (G.prs.l.lex == XC_LEX_EOF) goto done; } - IF_DC(s = zdc_parse_expr(&G.prs)); + s = zdc_parse_expr(&G.prs); +#endif } if (s || G_interrupt) { err: bc_parse_reset(&G.prs); // includes bc_program_reset() RETURN_STATUS(BC_STATUS_FAILURE); } - + IF_BC(execute:) dbg_lex("%s:%d executing...", __func__, __LINE__); s = zbc_program_exec(); if (s) { |