dc: fit returning of string

function                                             old     new   delta
zxc_program_exec                                    4087    4098     +11

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 13 insertions, 5 deletions

diff --git a/miscutils/bc.c b/miscutils/bc.c
index 1e8056c01..e497b0d02 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -6020,6 +6020,9 @@ static BC_STATUS zbc_program_return(char inst)
         BcInstPtr *ip = bc_vec_top(&G.prog.exestack);
 
         if (inst == XC_INST_RET) {
+                // bc needs this for e.g. RESULT_CONSTANT ("return 5")
+                // because bc constants are per-function.
+                // TODO: maybe avoid if value is already RESULT_TEMP?
                 BcStatus s;
                 BcNum *num;
                 BcResult *operand = bc_vec_top(&G.prog.results);
@@ -6458,7 +6461,17 @@ static BC_STATUS zxc_program_exec(void)
 
                 dbg_exec("inst at %zd:%d results.len:%d", ip->inst_idx - 1, inst, G.prog.results.len);
                 switch (inst) {
+                case XC_INST_RET:
+                        if (IS_DC) { // end of '?' reached
+                                bc_vec_pop(&G.prog.exestack);
+                                goto read_updated_ip;
+                        }
+                        // bc: fall through
 #if ENABLE_BC
+                case BC_INST_RET0:
+                        dbg_exec("BC_INST_RET[0]:");
+                        s = zbc_program_return(inst);
+                        goto read_updated_ip;
                 case BC_INST_JUMP_ZERO: {
                         BcNum *num;
                         bool zero;
@@ -6495,11 +6508,6 @@ static BC_STATUS zxc_program_exec(void)
                         dbg_exec("BC_INST_HALT:");
                         QUIT_OR_RETURN_TO_MAIN;
                         break;
-                case XC_INST_RET:
-                case BC_INST_RET0:
-                        dbg_exec("BC_INST_RET[0]:");
-                        s = zbc_program_return(inst);
-                        goto read_updated_ip;
                 case XC_INST_BOOL_OR:
                 case XC_INST_BOOL_AND:
 #endif // ENABLE_BC