继续按 align-linuxcnc 约束：补 convert_m 参数错误源码覆盖，测试通过

docs/linuxcnc-porting.md

@@ -197,12 +197,12 @@ This matrix tracks LinuxCNC feature coverage for the web/WASM simulator. A featu
 | Tool length offset `G43/G43.1/G43.2/G49` | covered with nonzero tool-table offset, dynamic replacement, additive axis offsets, `G43.2 H...`, and clear through LinuxCNC native/source backends | `tests/gcode/linuxcnc_tool_length.ngc`, `tests/gcode/linuxcnc_dynamic_tool_length.ngc` |
 | RTCP controls `G43.4/G43.5/G49` | covered as simulator-owned control lines | `tests/gcode/linuxcnc_rtcp_controls.ngc` |
 | Kinematics switch `M428/M429/M430` | covered as simulator-owned control lines | `tests/gcode/linuxcnc_rtcp_controls.ngc` |
-| Spindle, coolant, program stops, and current tool number `M3/M4/M5`, `M7/M8/M9`, `M0/M1/M60/M30`, `M61 Q...` | covered through LinuxCNC native/source backends | `tests/gcode/linuxcnc_spindle_direction.ngc`, `tests/gcode/linuxcnc_coolant.ngc`, `tests/gcode/linuxcnc_program_stops.ngc`, `tests/gcode/linuxcnc_tool_number.ngc` |
+| Spindle, coolant, program stops, and current tool number `M3/M4/M5`, `M7/M8/M9`, `M0/M1/M60/M30`, `M61 Q...` | covered through LinuxCNC native/source backends, including source-linked `convert_m()` rejection of negative `M61 Q` | `tests/gcode/linuxcnc_spindle_direction.ngc`, `tests/gcode/linuxcnc_coolant.ngc`, `tests/gcode/linuxcnc_program_stops.ngc`, `tests/gcode/linuxcnc_tool_number.ngc`, `tests/gcode/linuxcnc_m61_negative_q_error.ngc` |
 | Spindle speed mode `G96/G97` | covered with Canon `SET_SPINDLE_MODE` preserved as mode state events, including `G96 D...` max-RPM value | `tests/gcode/linuxcnc_spindle_modes.ngc` |
-| Spindle orientation `M19 R... P... Q...` | covered with Canon `ORIENT_SPINDLE` and `WAIT_SPINDLE_ORIENT_COMPLETE` preserved as temporary mode state events | `tests/gcode/linuxcnc_spindle_orient.ngc` |
+| Spindle orientation `M19 R... P... Q...` | covered with Canon `ORIENT_SPINDLE` and `WAIT_SPINDLE_ORIENT_COMPLETE` preserved as temporary mode state events, including source-linked `convert_m()` rejection of nonpositive `Q` waits | `tests/gcode/linuxcnc_spindle_orient.ngc`, `tests/gcode/linuxcnc_m19_zero_q_error.ngc` |
 | Spindle-synchronized feed and threading `G33/G33.1/G76` | covered through smoke, LinuxCNC native, and source-linked paths with Canon `START_SPEED_FEED_SYNCH`/`STOP_SPEED_FEED_SYNCH` preserved, rigid-tap line numbers normalized, and G76 multi-pass threading smoke-covered | `tests/gcode/linuxcnc_threading_sync.ngc`, `tests/gcode/linuxcnc_threading_cycle.ngc`, smoke API regression |
 | Lathe diameter/radius mode `G7/G8` | covered through LinuxCNC native/source backends for same-block X scaling, `G76` I/J/K threading geometry interaction, and `#<_lathe_diameter_mode>`/`#<_lathe_radius_mode>` readonly named-parameter state | `tests/gcode/linuxcnc_lathe_diameter_mode.ngc`, `tests/gcode/linuxcnc_lathe_diameter_g76.ngc` |
-| Digital/analog I/O `M62`-`M68` | covered with Canon digital output, analog output, and input wait callbacks preserved as temporary state events | `tests/gcode/linuxcnc_io_controls.ngc` |
+| Digital/analog I/O `M62`-`M68` | covered with Canon digital output, analog output, and input wait callbacks preserved as temporary state events, including source-linked `convert_m()` validation for required `P`/`E`, M66 input selection, M66 wait timeout, and analog wait restrictions | `tests/gcode/linuxcnc_io_controls.ngc`, `tests/gcode/linuxcnc_m62_missing_p_word_error.ngc`, `tests/gcode/linuxcnc_m63_missing_p_word_error.ngc`, `tests/gcode/linuxcnc_m64_missing_p_word_error.ngc`, `tests/gcode/linuxcnc_m65_missing_p_word_error.ngc`, `tests/gcode/linuxcnc_m66_missing_input_error.ngc`, `tests/gcode/linuxcnc_m66_both_inputs_error.ngc`, `tests/gcode/linuxcnc_m66_zero_timeout_error.ngc`, `tests/gcode/linuxcnc_m66_analog_wait_error.ngc`, `tests/gcode/linuxcnc_m67_missing_e_word_error.ngc`, `tests/gcode/linuxcnc_m68_missing_e_word_error.ngc` |
 | Override controls `M48`-`M53` | covered with Canon feed override, spindle speed override, adaptive feed, and feed hold callbacks preserved as temporary state events | `tests/gcode/linuxcnc_override_controls.ngc` |
 | Modal state save/restore `M70`-`M73` | covered for main-program save/invalidate/restore plus O-word subroutine autorestore in smoke parser, with native/source regressions checking restored distance mode, units, and XY plane motion | `tests/gcode/linuxcnc_modal_state.ngc`, `tests/gcode/linuxcnc_modal_autorestore.ngc` |
 | LinuxCNC read-only named parameters | common modal/unit/feed/spindle reads are covered through LinuxCNC native/source backends, with additional ccomp/spindle-mode readonly reads source-linked | `tests/gcode/linuxcnc_readonly_named_parameters.ngc`, `tests/gcode/linuxcnc_readonly_named_parameters_extra.ngc`, `tests/gcode/linuxcnc_lathe_diameter_mode.ngc` |

test-linuxcnc-source-link.sh

@@ -199,6 +199,35 @@ CNC_SIM_RS274_VAR="$var_file" \
 CNC_SIM_RS274_VAR="$var_file" \
     "$build_dir/linuxcnc_rs274_source_dump" tests/gcode/linuxcnc_io_controls.ngc \
     >"$output_dir/cnc_sim_linuxcnc_source_io_controls.json"
+# Source basis: LinuxCNC src/emc/rs274ngc/interp_convert.cc convert_m()
+# validates M62-M68 input/output words, M61 Q tool numbers, and M19 Q wait
+# values before issuing Canon output/input, tool, or spindle-orient calls.
+convert_m_error_cases=(
+    "linuxcnc_m62_missing_p_word_error|No valid P word with M62"
+    "linuxcnc_m63_missing_p_word_error|No valid P word with M63"
+    "linuxcnc_m64_missing_p_word_error|No valid P word with M64"
+    "linuxcnc_m65_missing_p_word_error|No valid P word with M65"
+    "linuxcnc_m66_missing_input_error|Need to have either a valid P or a valid E word with M66"
+    "linuxcnc_m66_both_inputs_error|Invalid to select both a digital and an analog input with M66"
+    "linuxcnc_m66_zero_timeout_error|Zero timeout with wait type != immediate return"
+    "linuxcnc_m66_analog_wait_error|Can't select analog input with wait type != immediate return"
+    "linuxcnc_m67_missing_e_word_error|Invalid analog index with M67"
+    "linuxcnc_m68_missing_e_word_error|Invalid analog index with M68"
+    "linuxcnc_m19_zero_q_error|Q word with M19 requires a value > 0"
+    "linuxcnc_m61_negative_q_error|Need non-negative Q-word to specify tool number with M61"
+)
+for case in "${convert_m_error_cases[@]}"; do
+    fixture=${case%%|*}
+    expected=${case#*|}
+    if CNC_SIM_RS274_VAR="$var_file" \
+        "$build_dir/linuxcnc_rs274_source_dump" "tests/gcode/$fixture.ngc" \
+        >"$output_dir/cnc_sim_linuxcnc_source_$fixture.json" \
+        2>"$output_dir/cnc_sim_linuxcnc_source_$fixture.err"; then
+        echo "expected $fixture.ngc to fail" >&2
+        exit 1
+    fi
+    grep -Fq "$expected" "$output_dir/cnc_sim_linuxcnc_source_$fixture.err"
+done
 CNC_SIM_RS274_VAR="$var_file" \
     "$build_dir/linuxcnc_rs274_source_dump" tests/gcode/linuxcnc_override_controls.ngc \
     >"$output_dir/cnc_sim_linuxcnc_source_override_controls.json"

tests/gcode/linuxcnc_m19_zero_q_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M19 R45 Q0
+M30

tests/gcode/linuxcnc_m61_negative_q_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M61 Q-1
+M30

tests/gcode/linuxcnc_m62_missing_p_word_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M62
+M30

tests/gcode/linuxcnc_m63_missing_p_word_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M63
+M30

tests/gcode/linuxcnc_m64_missing_p_word_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M64
+M30

tests/gcode/linuxcnc_m65_missing_p_word_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M65
+M30

tests/gcode/linuxcnc_m66_analog_wait_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M66 E0 L3 Q1
+M30

tests/gcode/linuxcnc_m66_both_inputs_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M66 P0 E0 L0
+M30

tests/gcode/linuxcnc_m66_missing_input_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M66 L0
+M30

tests/gcode/linuxcnc_m66_zero_timeout_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M66 P0 L3 Q0
+M30

tests/gcode/linuxcnc_m67_missing_e_word_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M67 Q1.25
+M30

tests/gcode/linuxcnc_m68_missing_e_word_error.ngc

@@ -0,0 +1,3 @@
+G21 G90 G17
+M68 Q2.5
+M30