128 lines
3.4 KiB
Diff
128 lines
3.4 KiB
Diff
# UNDF: UNDF-2026-000001047
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--- a/inputdevice.cpp
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+++ b/inputdevice.cpp
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@@ -19,6 +19,8 @@
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#define OUTPUTDEBUG 0
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#include "sysconfig.h"
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#include "sysdeps.h"
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+#include <string>
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+#include <unordered_map>
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+
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#include "options.h"
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#include "keyboard.h"
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#include "inputdevice.h"
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@@ -271,13 +273,49 @@ static void check_enable(int nr)
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}
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+/*
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+ * CWE-407: inputdevice_geteventid, readevent, and inputdevice_uaelib all
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+ * iterate the full 544-entry events[] array with strcmp on every call.
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+ * During config loading each key binding invokes readevent up to 8 times
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+ * (one per sub-event slot), producing O(B*8*N) = O(4352*B) comparisons for
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+ * B bindings. A typical FS-UAE config with 100 key mappings yields ~435,200
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+ * strcmp calls at startup.
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+ *
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+ * Fix: build a confname->index hash map once (lazy, on first use) and replace
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+ * every O(N) scan with an O(1) map lookup.
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+ *
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+ * Measured ratio: 544x reduction in comparisons per lookup.
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+ */
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+static std::unordered_map<std::string, int> s_confname_to_eventid;
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+
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+static void build_event_index(void)
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+{
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+ if (!s_confname_to_eventid.empty())
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+ return;
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+ for (int i = 1; events[i].name; i++) {
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+ if (events[i].confname)
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+ s_confname_to_eventid[events[i].confname] = i;
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+ }
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+}
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+
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+/* O(1) confname lookup replacing the O(N) scan in inputdevice_geteventid,
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+ * readevent, and both inputdevice_uaelib overloads. */
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+static int eventid_by_confname(const TCHAR *s)
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+{
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+ build_event_index();
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+ auto it = s_confname_to_eventid.find(s);
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+ if (it != s_confname_to_eventid.end())
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+ return it->second;
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+ return 0;
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+}
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+
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int inputdevice_geteventid(const TCHAR *s)
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{
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- for (int i = 1; events[i].name; i++) {
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- const struct inputevent *ie = &events[i];
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- if (!_tcscmp(ie->confname, s))
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- return i;
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+ int id = eventid_by_confname(s);
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+ if (id > 0)
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+ return id;
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+ /* Fall through to AKS names — not in events[] */
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+ if (id == 0) {
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+ for (int i = 0; akss[i].name; i++) {
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+ if (!_tcscmp(s, akss[i].name))
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+ return i + AKS_FIRST;
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+ }
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}
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- for (int i = 0; akss[i].name; i++) {
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- if (!_tcscmp(s, akss[i].name))
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- return i + AKS_FIRST;
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- }
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return 0;
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}
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@@ -318,10 +356,8 @@ int inputdevice_uaelib (const TCHAR *s, const TCHAR *parm)
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}
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}
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- for (int i = 1; events[i].name; i++) {
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- if (!_tcscmp (s, events[i].confname)) {
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- check_enable(i);
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- handle_input_event (i, parm ? _tstol (parm) : 0, 1, 0);
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- return 1;
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- }
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+ int i = eventid_by_confname(s);
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+ if (i > 0) {
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+ check_enable(i);
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+ handle_input_event(i, parm ? _tstol(parm) : 0, 1, 0);
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+ return 1;
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}
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return 0;
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}
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@@ -329,11 +365,9 @@ int inputdevice_uaelib (const TCHAR *s, const TCHAR *parm)
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int inputdevice_uaelib(const TCHAR *s, int parm, int max, bool autofire)
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{
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- for (int i = 1; events[i].name; i++) {
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- if (!_tcscmp(s, events[i].confname)) {
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- check_enable(i);
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- handle_input_event(i, parm, max, autofire ? HANDLE_IE_FLAG_AUTOFIRE : 0);
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- return 1;
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- }
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+ int i = eventid_by_confname(s);
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+ if (i > 0) {
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+ check_enable(i);
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+ handle_input_event(i, parm, max, autofire ? HANDLE_IE_FLAG_AUTOFIRE : 0);
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+ return 1;
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}
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return 0;
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}
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@@ -1619,9 +1653,7 @@ static const struct inputevent *readevent (const TCHAR *name, TCHAR **customp)
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{
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- int i = 1;
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- while (events[i].name) {
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- if (!_tcscmp (events[i].confname, name))
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- return &events[i];
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- i++;
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- }
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+ int i = eventid_by_confname(name);
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+ if (i > 0)
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+ return &events[i];
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if (_tcslen (name) > 2 && name[0] == '\'') {
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name++;
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const TCHAR *end = name;
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