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vt: split up action_param() to three separate functions
We’re already switching on the next VT input byte in the state machine; no need to if...else if in action_param() too. That is, split up action_param() into three: * action_param_new() * action_param_new_subparam() * action_param() This makes the code cleaner, and hopefully slightly faster. Next, to improve performance further, only check for (sub)parameter overflow in action_param_new() and action_param_subparam(). Add pointers to the VT struct that points to the currently active parameter and sub-parameter. When the number of parameters (or sub-parameters) overflow, warn, and then point the parameter pointer to a "dummy" value in the VT struct. This way, we don’t have to check anything in action_param().
This commit is contained in:
Daniel Eklöf
parent
690d78edfa
commit
d88bea5e22
2 changed files with 75 additions and 68 deletions
135
vt.c
135
vt.c
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@ -294,74 +294,31 @@ action_print(struct terminal *term, uint8_t c)
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}
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static void
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action_param(struct terminal *term, uint8_t c)
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action_param_lazy_init(struct terminal *term)
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{
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if (term->vt.params.idx == 0) {
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struct vt_param *param = &term->vt.params.v[0];
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term->vt.params.cur = param;
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param->value = 0;
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param->sub.idx = 0;
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param->sub.cur = NULL;
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term->vt.params.idx = 1;
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}
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}
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xassert(term->vt.params.idx > 0);
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static void
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action_param_new(struct terminal *term, uint8_t c)
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{
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xassert(c == ';');
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action_param_lazy_init(term);
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const size_t max_params
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= sizeof(term->vt.params.v) / sizeof(term->vt.params.v[0]);
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const size_t max_sub_params
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= sizeof(term->vt.params.v[0].sub.value) / sizeof(term->vt.params.v[0].sub.value[0]);
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/* New parameter */
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if (c == ';') {
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if (unlikely(term->vt.params.idx >= max_params))
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goto excess_params;
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struct vt_param *param;
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struct vt_param *param = &term->vt.params.v[term->vt.params.idx++];
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param->value = 0;
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param->sub.idx = 0;
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}
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/* New sub-parameter */
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else if (c == ':') {
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if (unlikely(term->vt.params.idx - 1 >= max_params))
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goto excess_params;
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struct vt_param *param = &term->vt.params.v[term->vt.params.idx - 1];
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if (unlikely(param->sub.idx >= max_sub_params))
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goto excess_sub_params;
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param->sub.value[param->sub.idx++] = 0;
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}
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/* New digit for current parameter/sub-parameter */
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else {
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if (unlikely(term->vt.params.idx - 1 >= max_params))
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goto excess_params;
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struct vt_param *param = &term->vt.params.v[term->vt.params.idx - 1];
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unsigned *value;
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if (param->sub.idx > 0) {
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if (unlikely(param->sub.idx - 1 >= max_sub_params))
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goto excess_sub_params;
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value = ¶m->sub.value[param->sub.idx - 1];
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} else
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value = ¶m->value;
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*value *= 10;
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*value += c - '0';
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}
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#if defined(_DEBUG)
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/* The rest of the code assumes 'idx' *never* points outside the array */
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xassert(term->vt.params.idx <= max_params);
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for (size_t i = 0; i < term->vt.params.idx; i++)
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xassert(term->vt.params.v[i].sub.idx <= max_sub_params);
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#endif
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return;
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excess_params:
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{
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if (unlikely(term->vt.params.idx >= max_params)) {
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static bool have_warned = false;
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if (!have_warned) {
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have_warned = true;
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@ -370,11 +327,29 @@ excess_params:
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"(will not warn again)",
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sizeof(term->vt.params.v) / sizeof(term->vt.params.v[0]));
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}
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}
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return;
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param = &term->vt.params.dummy;
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} else
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param = &term->vt.params.v[term->vt.params.idx++];
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excess_sub_params:
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{
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term->vt.params.cur = param;
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param->value = 0;
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param->sub.idx = 0;
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param->sub.cur = NULL;
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}
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static void
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action_param_new_subparam(struct terminal *term, uint8_t c)
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{
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xassert(c == ':');
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action_param_lazy_init(term);
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const size_t max_sub_params
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= sizeof(term->vt.params.v[0].sub.value) / sizeof(term->vt.params.v[0].sub.value[0]);
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struct vt_param *param = term->vt.params.cur;
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unsigned *sub_param_value;
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if (unlikely(param->sub.idx >= max_sub_params)) {
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static bool have_warned = false;
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if (!have_warned) {
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have_warned = true;
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@ -383,8 +358,33 @@ excess_sub_params:
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"(will not warn again)",
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sizeof(term->vt.params.v[0].sub.value) / sizeof(term->vt.params.v[0].sub.value[0]));
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}
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}
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return;
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sub_param_value = ¶m->sub.dummy;
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} else
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sub_param_value = ¶m->sub.value[param->sub.idx++];
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param->sub.cur = sub_param_value;
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*sub_param_value = 0;
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}
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static void
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action_param(struct terminal *term, uint8_t c)
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{
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action_param_lazy_init(term);
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xassert(term->vt.params.cur != NULL);
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struct vt_param *param = term->vt.params.cur;
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unsigned *value;
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if (unlikely(param->sub.cur != NULL))
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value = param->sub.cur;
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else
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value = ¶m->value;
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unsigned v = *value;
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v *= 10;
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v += c - '0';
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*value = v;
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}
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static void
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@ -1024,7 +1024,9 @@ state_csi_entry_switch(struct terminal *term, uint8_t data)
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case 0x20 ... 0x2f: action_collect(term, data); return STATE_CSI_INTERMEDIATE;
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case 0x30 ... 0x39: action_param(term, data); return STATE_CSI_PARAM;
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case 0x3a ... 0x3b: action_param(term, data); return STATE_CSI_PARAM;
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case 0x3a: action_param_new_subparam(term, data); return STATE_CSI_PARAM;
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case 0x3b: action_param_new(term, data); return STATE_CSI_PARAM;
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case 0x3c ... 0x3f: action_collect(term, data); return STATE_CSI_PARAM;
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case 0x40 ... 0x7e: action_csi_dispatch(term, data); return STATE_GROUND;
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case 0x7f: action_ignore(term); return STATE_CSI_ENTRY;
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@ -1044,8 +1046,9 @@ state_csi_param_switch(struct terminal *term, uint8_t data)
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case 0x20 ... 0x2f: action_collect(term, data); return STATE_CSI_INTERMEDIATE;
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case 0x30 ... 0x39:
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case 0x3a ... 0x3b: action_param(term, data); return STATE_CSI_PARAM;
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case 0x30 ... 0x39: action_param(term, data); return STATE_CSI_PARAM;
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case 0x3a: action_param_new_subparam(term, data); return STATE_CSI_PARAM;
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case 0x3b: action_param_new(term, data); return STATE_CSI_PARAM;
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case 0x3c ... 0x3f: return STATE_CSI_IGNORE;
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case 0x40 ... 0x7e: action_csi_dispatch(term, data); return STATE_GROUND;
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@ -1126,7 +1129,7 @@ state_dcs_entry_switch(struct terminal *term, uint8_t data)
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case 0x20 ... 0x2f: action_collect(term, data); return STATE_DCS_INTERMEDIATE;
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case 0x30 ... 0x39: action_param(term, data); return STATE_DCS_PARAM;
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case 0x3a: return STATE_DCS_IGNORE;
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case 0x3b: action_param(term, data); return STATE_DCS_PARAM;
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case 0x3b: action_param_new(term, data); return STATE_DCS_PARAM;
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case 0x3c ... 0x3f: action_collect(term, data); return STATE_DCS_PARAM;
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case 0x40 ... 0x7e: action_hook(term, data); return STATE_DCS_PASSTHROUGH;
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case 0x7f: action_ignore(term); return STATE_DCS_ENTRY;
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@ -1147,7 +1150,7 @@ state_dcs_param_switch(struct terminal *term, uint8_t data)
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case 0x20 ... 0x2f: action_collect(term, data); return STATE_DCS_INTERMEDIATE;
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case 0x30 ... 0x39: action_param(term, data); return STATE_DCS_PARAM;
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case 0x3a: return STATE_DCS_IGNORE;
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case 0x3b: action_param(term, data); return STATE_DCS_PARAM;
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case 0x3b: action_param_new(term, data); return STATE_DCS_PARAM;
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case 0x3c ... 0x3f: return STATE_DCS_IGNORE;
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case 0x40 ... 0x7e: action_hook(term, data); return STATE_DCS_PASSTHROUGH;
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case 0x7f: action_ignore(term); return STATE_DCS_PARAM;
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