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-rw-r--r--src/map/script.c111
1 files changed, 76 insertions, 35 deletions
diff --git a/src/map/script.c b/src/map/script.c
index 7a2f1f24b..b87020253 100644
--- a/src/map/script.c
+++ b/src/map/script.c
@@ -858,50 +858,87 @@ const char* parse_variable(const char* p) {
return p;
}
+/*
+ * Checks whether the gives string is a number literal
+ *
+ * Mainly necessary to differentiate between number literals and NPC name
+ * constants, since several of those start with a digit.
+ *
+ * All this does is to check if the string begins with an optional + or - sign,
+ * followed by a hexadecimal or decimal number literal literal and is NOT
+ * followed by a underscore or letter.
+ *
+ * @param p Pointer to the string to check
+ * @return Whether the string is a number literal
+ */
+bool is_number(const char *p) {
+ const char *np;
+ if (!p)
+ return false;
+ if (*p == '-' || *p == '+')
+ p++;
+ np = p;
+ if (*p == '0' && p[1] == 'x') {
+ p+=2;
+ np = p;
+ // Hexadecimal
+ while (ISXDIGIT(*np))
+ np++;
+ } else {
+ // Decimal
+ while (ISDIGIT(*np))
+ np++;
+ }
+ if (p != np && *np != '_' && !ISALPHA(*np)) // At least one digit, and next isn't a letter or _
+ return true;
+ return false;
+}
+
/*==========================================
* Analysis section
*------------------------------------------*/
-const char* parse_simpleexpr(const char *p)
-{
- long long i;
+const char* parse_simpleexpr(const char *p) {
+ int i;
p=script->skip_space(p);
if(*p==';' || *p==',')
disp_error_message("parse_simpleexpr: unexpected end of expression",p);
- if(*p=='('){
+ if(*p=='(') {
if( (i=script->syntax.curly_count-1) >= 0 && script->syntax.curly[i].type == TYPE_ARGLIST )
++script->syntax.curly[i].count;
p=script->parse_subexpr(p+1,-1);
p=script->skip_space(p);
- if( (i=script->syntax.curly_count-1) >= 0 && script->syntax.curly[i].type == TYPE_ARGLIST &&
- script->syntax.curly[i].flag == ARGLIST_UNDEFINED && --script->syntax.curly[i].count == 0
- ){
- if( *p == ',' ){
+ if( (i=script->syntax.curly_count-1) >= 0 && script->syntax.curly[i].type == TYPE_ARGLIST
+ && script->syntax.curly[i].flag == ARGLIST_UNDEFINED && --script->syntax.curly[i].count == 0
+ ) {
+ if( *p == ',' ) {
script->syntax.curly[i].flag = ARGLIST_PAREN;
return p;
- } else
+ } else {
script->syntax.curly[i].flag = ARGLIST_NO_PAREN;
+ }
}
if( *p != ')' )
disp_error_message("parse_simpleexpr: unmatched ')'",p);
++p;
- } else if(ISDIGIT(*p) || ((*p=='-' || *p=='+') && ISDIGIT(p[1]))){
+ } else if(is_number(p)) {
char *np;
- while(*p == '0' && ISDIGIT(p[1])) p++;
- i=strtoll(p,&np,0);
- if( i < INT_MIN ) {
- i = INT_MIN;
+ long long lli;
+ while(*p == '0' && ISDIGIT(p[1])) p++; // Skip leading zeros, we don't support octal literals
+ lli=strtoll(p,&np,0);
+ if( lli < INT_MIN ) {
+ lli = INT_MIN;
script->disp_warning_message("parse_simpleexpr: underflow detected, capping value to INT_MIN",p);
- } else if( i > INT_MAX ) {
- i = INT_MAX;
+ } else if( lli > INT_MAX ) {
+ lli = INT_MAX;
script->disp_warning_message("parse_simpleexpr: overflow detected, capping value to INT_MAX",p);
}
- script->addi((int)i);
+ script->addi((int)lli); // Cast is safe, as it's already been checked for overflows
p=np;
- } else if(*p=='"'){
+ } else if(*p=='"') {
script->addc(C_STR);
p++;
- while( *p && *p != '"' ){
+ while( *p && *p != '"' ) {
if( (unsigned char)p[-1] <= 0x7e && *p == '\\' ) {
char buf[8];
size_t len = sv->skip_escaped_c(p) - p;
@@ -911,8 +948,9 @@ const char* parse_simpleexpr(const char *p)
p += len;
script->addb(*buf);
continue;
- } else if( *p == '\n' )
+ } else if( *p == '\n' ) {
disp_error_message("parse_simpleexpr: unexpected newline @ string",p);
+ }
script->addb(*p++);
}
if(!*p)
@@ -928,24 +966,24 @@ const char* parse_simpleexpr(const char *p)
disp_error_message("parse_simpleexpr: unexpected character",p);
l=script->add_word(p);
- if( script->str_data[l].type == C_FUNC || script->str_data[l].type == C_USERFUNC || script->str_data[l].type == C_USERFUNC_POS)
+ if( script->str_data[l].type == C_FUNC || script->str_data[l].type == C_USERFUNC || script->str_data[l].type == C_USERFUNC_POS) {
return script->parse_callfunc(p,1,0);
#ifdef SCRIPT_CALLFUNC_CHECK
- else {
+ } else {
const char* name = script->get_str(l);
if( strdb_get(script->userfunc_db,name) != NULL ) {
return script->parse_callfunc(p,1,1);
}
- }
#endif
+ }
- if( (pv = script->parse_variable(p)) )
- {// successfully processed a variable assignment
+ if( (pv = script->parse_variable(p)) ) {
+ // successfully processed a variable assignment
return pv;
}
p=script->skip_word(p);
- if( *p == '[' ){
+ if( *p == '[' ) {
// array(name[i] => getelementofarray(name,i) )
script->addl(script->buildin_getelementofarray_ref);
script->addc(C_ARG);
@@ -957,8 +995,9 @@ const char* parse_simpleexpr(const char *p)
disp_error_message("parse_simpleexpr: unmatched ']'",p);
++p;
script->addc(C_FUNC);
- }else
+ } else {
script->addl(l);
+ }
}
@@ -1229,8 +1268,16 @@ const char* parse_syntax(const char* p)
disp_error_message("parse_syntax: expect space ' '",p);
}
// check whether case label is integer or not
- v = strtol(p,&np,0);
- if(np == p) { //Check for constants
+ if(is_number(p)) {
+ //Numeric value
+ v = strtol(p,&np,0);
+ if((*p == '-' || *p == '+') && ISDIGIT(p[1])) // pre-skip because '-' can not skip_word
+ p++;
+ p = script->skip_word(p);
+ if(np != p)
+ disp_error_message("parse_syntax: 'case' label is not an integer",np);
+ } else {
+ //Check for constants
p2 = script->skip_word(p);
v = p2-p; // length of word at p2
memcpy(label,p,v);
@@ -1238,12 +1285,6 @@ const char* parse_syntax(const char* p)
if( !script->get_constant(label, &v) )
disp_error_message("parse_syntax: 'case' label is not an integer",p);
p = script->skip_word(p);
- } else { //Numeric value
- if((*p == '-' || *p == '+') && ISDIGIT(p[1])) // pre-skip because '-' can not skip_word
- p++;
- p = script->skip_word(p);
- if(np != p)
- disp_error_message("parse_syntax: 'case' label is not an integer",np);
}
p = script->skip_space(p);
if(*p != ':')
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-28 08:19:02 +0000