diff options
| -rw-r--r-- | miscutils/bc.c | 69 |
1 files changed, 39 insertions, 30 deletions
diff --git a/miscutils/bc.c b/miscutils/bc.c index 2bde515..bd70670 100644 --- a/miscutils/bc.c +++ b/miscutils/bc.c @@ -213,7 +213,7 @@ typedef enum BcStatus { BC_STATUS_EXEC_REC_READ, BC_STATUS_EXEC_BAD_TYPE, // BC_STATUS_EXEC_BAD_OBASE, - BC_STATUS_EXEC_SIGNAL, +// BC_STATUS_EXEC_SIGNAL, BC_STATUS_EXEC_STACK, // BC_STATUS_VEC_OUT_OF_BOUNDS, @@ -285,7 +285,7 @@ static const char *const bc_err_msgs[] = { "read() call inside of a read() call", "variable is wrong type", // "bad obase; must be [2, BC_BASE_MAX]", - "signal caught and not handled", +// "signal caught and not handled", "stack has too few elements", // "index is out of bounds", @@ -840,7 +840,7 @@ typedef struct BcProgram { typedef unsigned long (*BcProgramBuiltIn)(BcNum *); static void bc_program_addFunc(char *name, size_t *idx); -static BcStatus bc_program_reset(BcStatus s); +static void bc_program_reset(void); #define BC_FLAG_X (1 << 0) #define BC_FLAG_W (1 << 1) @@ -1034,7 +1034,6 @@ static const BcNumBinaryOp bc_program_ops[] = { }; static const char bc_program_stdin_name[] = "<stdin>"; -static const char bc_program_ready_msg[] = "ready for more input\n"; #if ENABLE_BC static const char *bc_lib_name = "gen/lib.bc"; @@ -3617,7 +3616,9 @@ static BcStatus bc_parse_text(BcParse *p, const char *text) return bc_lex_text(&p->l, text); } -static BcStatus bc_parse_reset(BcParse *p, BcStatus s) +// Called when bc/dc_parse_parse() detects a failure, +// resets parsing structures. +static void bc_parse_reset(BcParse *p) { if (p->fidx != BC_PROG_MAIN) { @@ -3638,7 +3639,7 @@ static BcStatus bc_parse_reset(BcParse *p, BcStatus s) bc_vec_npop(&p->conds, p->conds.len); bc_vec_npop(&p->ops, p->ops.len); - return bc_program_reset(s); + bc_program_reset(); } static void bc_parse_free(BcParse *p) @@ -4733,8 +4734,10 @@ static BcStatus bc_parse_parse(BcParse *p) else s = bc_parse_stmt(p); - if (s || G_interrupt) - s = bc_parse_reset(p, s); + if (s || G_interrupt) { + bc_parse_reset(p); + s = BC_STATUS_FAILURE; + } return s; } @@ -4947,7 +4950,7 @@ static BcStatus bc_parse_expr(BcParse *p, uint8_t flags, BcParseNext next) } if (s) return s; - if (G_interrupt) return BC_STATUS_EXEC_SIGNAL; + if (G_interrupt) return BC_STATUS_FAILURE; // ^C: stop parsing while (p->ops.len > ops_bgn) { @@ -5207,7 +5210,10 @@ static BcStatus dc_parse_parse(BcParse *p) else s = dc_parse_expr(p, 0); - if (s || G_interrupt) s = bc_parse_reset(p, s); + if (s || G_interrupt) { + bc_parse_reset(p); + s = BC_STATUS_FAILURE; + } return s; } @@ -6494,7 +6500,9 @@ static void bc_program_addFunc(char *name, size_t *idx) } } -static BcStatus bc_program_reset(BcStatus s) +// Called when parsing or execution detects a failure, +// resets execution structures. +static void bc_program_reset(void) { BcFunc *f; BcInstPtr *ip; @@ -6506,18 +6514,12 @@ static BcStatus bc_program_reset(BcStatus s) ip = bc_vec_top(&G.prog.stack); ip->idx = f->code.len; - if (!s && G_interrupt && !G.tty) quit(); + // If !tty, no need to check for ^C: we don't have ^C handler, + // we would be killed by a signal and won't reach this place - if (!s || s == BC_STATUS_EXEC_SIGNAL) { - if (!G.ttyin) - quit(); - fflush_and_check(); // make sure buffered stdout is printed - fputs(bc_program_ready_msg, stderr); - fflush_and_check(); - s = BC_STATUS_SUCCESS; - } - - return s; + fflush_and_check(); // make sure buffered stdout is printed + fputs("ready for more input\n", stderr); + fflush_and_check(); } static BcStatus bc_program_exec(void) @@ -6828,7 +6830,10 @@ static BcStatus bc_program_exec(void) #endif // ENABLE_DC } - if (s || G_interrupt) s = bc_program_reset(s); + if (s || G_interrupt) { + bc_program_reset(); + break; + } // If the stack has changed, pointers may be invalid. ip = bc_vec_top(&G.prog.stack); @@ -6951,8 +6956,10 @@ static BcStatus bc_vm_process(const char *text) if (BC_PARSE_CAN_EXEC(&G.prs)) { s = bc_program_exec(); fflush_and_check(); - if (s) - s = bc_vm_error(bc_program_reset(s), G.prs.l.f, 0); + if (s) { + bc_program_reset(); + s = bc_vm_error(s, G.prs.l.f, 0); + } } return s; @@ -7185,10 +7192,6 @@ static void bc_vm_init(const char *env_len) { size_t len = bc_vm_envLen(env_len); -#if ENABLE_FEATURE_BC_SIGNALS - signal_no_SA_RESTART_empty_mask(SIGINT, record_signo); -#endif - bc_vec_init(&G.files, sizeof(char *), NULL); if (IS_BC) { @@ -7216,7 +7219,13 @@ static BcStatus bc_vm_run(int argc, char *argv[], G.ttyin = isatty(0); G.tty = G.ttyin || (G.flags & BC_FLAG_I) || isatty(1); - if (G.ttyin && !(G.flags & BC_FLAG_Q)) bc_vm_info(); + if (G.ttyin) { +#if ENABLE_FEATURE_BC_SIGNALS + signal_no_SA_RESTART_empty_mask(SIGINT, record_signo); +#endif + if (!(G.flags & BC_FLAG_Q)) + bc_vm_info(); + } st = bc_vm_exec(); #if ENABLE_FEATURE_CLEAN_UP |