feat: string constants via sym=val (define constant)

pull: openmultiplayer#12

Author: gskeleton

source/compiler/sc.h

@@ -303,6 +303,15 @@ typedef struct s_valuepair {
   long second;
 } valuepair;
 
+typedef struct s_builtinstring {
+  struct {
+    char name[sNAMEMAX+1];
+    char value[_MAX_PATH];
+  } *entries;
+  int count;
+  int size;
+} builtinstring;
+
 /* macros for code generation */
 #define opcodes(n)      ((n)*sizeof(cell))      /* opcode size */
 #define opargs(n)       ((n)*sizeof(cell))      /* size of typical argument */
@@ -884,6 +893,8 @@ SC_VDECL int pc_recursion;    /* enable detailed recursion report? */
 SC_VDECL constvalue_root sc_automaton_tab; /* automaton table */
 SC_VDECL constvalue_root sc_state_tab;     /* state table */
 
+SC_VDECL builtinstring builtin_strings; /* string constants */
+
 SC_VDECL FILE *inpf;          /* file read from (source or include) */
 SC_VDECL FILE *inpf_org;      /* main source file */
 SC_VDECL FILE *outf;          /* file written to */

source/compiler/sc1.c

@@ -142,6 +142,9 @@ static void dostate(void);
 static void addwhile(int *ptr);
 static void delwhile(void);
 static int *readwhile(void);
+static void remember_builtin_string(const char *name,const char *value);
+static void register_builtin_string(void);
+static void delete_builtin_string(void);
 
 typedef void (SC_FASTCALL *OPCODE_PROC)(char *name);
 typedef struct {
@@ -796,6 +799,7 @@ int pc_compile(int argc, char *argv[])
   #endif
   delete_autolisttable();
   delete_heaplisttable();
+  delete_builtin_string();
   if (errnum!=0) {
     if (strlen(errfname)==0)
       pc_printf("\n%d Error%s.\n",errnum,(errnum>1) ? "s" : "");
@@ -1252,8 +1256,17 @@ static void parseoptions(int argc,char **argv,char *oname,char *ename,char *pnam
         error(200,argv[arg],sNAMEMAX);  /* symbol too long, truncated to sNAMEMAX chars */
       } /* if */
       strlcpy(str,argv[arg],i+1);       /* str holds symbol name */
-      i=atoi(ptr+1);
-      add_builtin_constant(str,i,sGLOBAL,0);
+      if (*(ptr+1)=='\"') {             /* check if value starts with quote */
+          char strval[_MAX_PATH];
+          strlcpy(strval,ptr+2,sizeof(strval)); /* copy string value (skip =") */
+          int len=strlen(strval);
+          if (len>0 && strval[len-1]=='\"')     /* remove trailing quote */
+            strval[len-1]='\0';
+          remember_builtin_string(str,strval);  /* store as string constant */
+      } else {
+          i=atoi(ptr+1);                        /* convert numeric value */
+          add_builtin_constant(str,i,sGLOBAL,0); /* store as integer constant */
+      }
     } else if (oname) {
       strlcpy(str,argv[arg],sizeof(str)-2); /* -2 because default extension is ".p" */
       set_extension(str,".p",FALSE);
@@ -1592,6 +1605,8 @@ static void setstringconstants()
   add_builtin_string_constant("__time",timebuf,sGLOBAL);
   strftime(datebuf,sizeof(datebuf),"%d %b %Y",localtime(&now));
   add_builtin_string_constant("__date",datebuf,sGLOBAL);
+
+  register_builtin_string();
 }
 
 static int getclassspec(int initialtok,int *fpublic,int *fstatic,int *fstock,int *fconst)
@@ -1664,6 +1679,59 @@ static int getclassspec(int initialtok,int *fpublic,int *fstatic,int *fstock,int
   return err==0;
 }
 
+static void remember_builtin_string(const char *name,const char *value) 
+{
+    builtinstring *tbl=&builtin_strings;
+    int newsize;
+    void *p;
+
+    assert(tbl!=NULL);
+    
+    /* Expand the array if necessary */
+    if (tbl->count >= tbl->size) {
+        newsize=(tbl->size==0) ? 2 : tbl->size * 2;
+        p=realloc(tbl->entries,newsize * sizeof(*tbl->entries));
+        
+        if (p==NULL) {
+            error(103);   /* insufficient memory */
+            return;
+        }
+        
+        tbl->entries = p;
+        tbl->size = newsize;
+    }
+    
+    /* Copy the name and value into the next available slot */
+    strlcpy(tbl->entries[tbl->count].name,name,sizeof(tbl->entries[tbl->count].name));
+    strlcpy(tbl->entries[tbl->count].value,value,sizeof(tbl->entries[tbl->count].value));
+    tbl->count++;
+}
+
+static void register_builtin_string(void)
+{
+    builtinstring *tbl=&builtin_strings;
+
+    assert(tbl!=NULL);
+    
+    /* Add each remembered string constant to the global symbol table */
+    for (int i=0; i<tbl->count; ++i) {
+        add_builtin_string_constant(tbl->entries[i].name,tbl->entries[i].value,sGLOBAL);
+    }
+}
+
+static void delete_builtin_string(void) 
+{
+    builtinstring *tbl=&builtin_strings;
+
+    assert(tbl!=NULL);
+    
+    /* Release the entries array and reset counters */
+    free(tbl->entries);
+    tbl->entries=NULL;
+    tbl->count=0;
+    tbl->size=0;
+}
+
 /*  parse       - process all input text
  *
  *  At this level, only static declarations and function definitions are legal.

source/compiler/scvars.c

@@ -98,6 +98,8 @@ SC_VDEFINE int pc_recursion=FALSE;          /* enable detailed recursion report?
 SC_VDEFINE constvalue_root sc_automaton_tab = { NULL, NULL}; /* automaton table */
 SC_VDEFINE constvalue_root sc_state_tab = { NULL, NULL};   /* state table */
 
+SC_VDEFINE builtinstring builtin_strings={NULL, 0, 0}; /* string constants */
+
 SC_VDEFINE FILE *inpf    = NULL;   /* file read from (source or include) */
 SC_VDEFINE FILE *inpf_org= NULL;   /* main source file */
 SC_VDEFINE FILE *outf    = NULL;   /* (intermediate) text file written to */