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minix/commands/bc/util.c
Ben Gras 9865aeaa79 Initial revision
2005-04-21 14:53:53 +00:00

796 lines
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/* util.c: Utility routines for bc. */
/* This file is part of bc written for MINIX.
Copyright (C) 1991, 1992 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License , or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
You may contact the author by:
e-mail: phil@cs.wwu.edu
us-mail: Philip A. Nelson
Computer Science Department, 9062
Western Washington University
Bellingham, WA 98226-9062
*************************************************************************/
#include "bcdefs.h"
#ifndef VARARGS
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include "global.h"
#include "proto.h"
/* strcopyof mallocs new memory and copies a string to to the new
memory. */
char *
strcopyof (str)
char *str;
{
char *temp;
temp = (char *) bc_malloc (strlen (str)+1);
return (strcpy (temp,str));
}
/* nextarg adds another value to the list of arguments. */
arg_list *
nextarg (args, val)
arg_list *args;
char val;
{ arg_list *temp;
temp = (arg_list *) bc_malloc (sizeof (arg_list));
temp->av_name = val;
temp->next = args;
return (temp);
}
/* For generate, we must produce a string in the form
"val,val,...,val". We also need a couple of static variables
for retaining old generated strings. It also uses a recursive
function that builds the string. */
static char *arglist1 = NULL, *arglist2 = NULL;
/* make_arg_str does the actual construction of the argument string.
ARGS is the pointer to the list and LEN is the maximum number of
characters needed. 1 char is the minimum needed. COMMAS tells
if each number should be seperated by commas.*/
_PROTOTYPE (static char *make_arg_str, (arg_list *args, int len, int commas));
static char *
make_arg_str (args, len, commas)
arg_list *args;
int len;
int commas;
{
char *temp;
char sval[20];
/* Recursive call. */
if (args != NULL)
temp = make_arg_str (args->next, len+11, commas);
else
{
temp = (char *) bc_malloc (len);
*temp = 0;
return temp;
}
/* Add the current number to the end of the string. */
if (len != 1 && commas)
sprintf (sval, "%d,", args->av_name);
else
sprintf (sval, "%d", args->av_name);
temp = strcat (temp, sval);
return (temp);
}
char *
arg_str (args, commas)
arg_list *args;
int commas;
{
if (arglist2 != NULL)
free (arglist2);
arglist2 = arglist1;
arglist1 = make_arg_str (args, 1, commas);
return (arglist1);
}
/* free_args frees an argument list ARGS. */
void
free_args (args)
arg_list *args;
{
arg_list *temp;
temp = args;
while (temp != NULL)
{
args = args->next;
free (temp);
temp = args;
}
}
/* Check for valid parameter (PARAMS) and auto (AUTOS) lists.
There must be no duplicates any where. Also, this is where
warnings are generated for array parameters. */
void
check_params ( params, autos )
arg_list *params, *autos;
{
arg_list *tmp1, *tmp2;
/* Check for duplicate parameters. */
if (params != NULL)
{
tmp1 = params;
while (tmp1 != NULL)
{
tmp2 = tmp1->next;
while (tmp2 != NULL)
{
if (tmp2->av_name == tmp1->av_name)
yyerror ("duplicate parameter names");
tmp2 = tmp2->next;
}
if (tmp1->av_name < 0)
warn ("Array parameter");
tmp1 = tmp1->next;
}
}
/* Check for duplicate autos. */
if (autos != NULL)
{
tmp1 = autos;
while (tmp1 != NULL)
{
tmp2 = tmp1->next;
while (tmp2 != NULL)
{
if (tmp2->av_name == tmp1->av_name)
yyerror ("duplicate auto variable names");
tmp2 = tmp2->next;
}
tmp1 = tmp1->next;
}
}
/* Check for duplicate between parameters and autos. */
if ((params != NULL) && (autos != NULL))
{
tmp1 = params;
while (tmp1 != NULL)
{
tmp2 = autos;
while (tmp2 != NULL)
{
if (tmp2->av_name == tmp1->av_name)
yyerror ("variable in both parameter and auto lists");
tmp2 = tmp2->next;
}
tmp1 = tmp1->next;
}
}
}
/* Initialize the code generator the parser. */
void
init_gen ()
{
/* Get things ready. */
break_label = 0;
continue_label = 0;
next_label = 1;
out_count = 2;
if (compile_only)
printf ("@i");
else
init_load ();
had_error = FALSE;
did_gen = FALSE;
}
/* generate code STR for the machine. */
void
generate (str)
char *str;
{
did_gen = TRUE;
if (compile_only)
{
printf ("%s",str);
out_count += strlen(str);
if (out_count > 60)
{
printf ("\n");
out_count = 0;
}
}
else
load_code (str);
}
/* Execute the current code as loaded. */
void
run_code()
{
/* If no compile errors run the current code. */
if (!had_error && did_gen)
{
if (compile_only)
{
printf ("@r\n");
out_count = 0;
}
else
execute ();
}
/* Reinitialize the code generation and machine. */
if (did_gen)
init_gen();
else
had_error = FALSE;
}
/* Output routines: Write a character CH to the standard output.
It keeps track of the number of characters output and may
break the output with a "\<cr>". */
void
out_char (ch)
char ch;
{
if (ch == '\n')
{
out_col = 0;
putchar ('\n');
}
else
{
out_col++;
if (out_col == 70)
{
putchar ('\\');
putchar ('\n');
out_col = 1;
}
putchar (ch);
}
}
/* The following are "Symbol Table" routines for the parser. */
/* find_id returns a pointer to node in TREE that has the correct
ID. If there is no node in TREE with ID, NULL is returned. */
id_rec *
find_id (tree, id)
id_rec *tree;
char *id;
{
int cmp_result;
/* Check for an empty tree. */
if (tree == NULL)
return NULL;
/* Recursively search the tree. */
cmp_result = strcmp (id, tree->id);
if (cmp_result == 0)
return tree; /* This is the item. */
else if (cmp_result < 0)
return find_id (tree->left, id);
else
return find_id (tree->right, id);
}
/* insert_id_rec inserts a NEW_ID rec into the tree whose ROOT is
provided. insert_id_rec returns TRUE if the tree height from
ROOT down is increased otherwise it returns FALSE. This is a
recursive balanced binary tree insertion algorithm. */
int insert_id_rec (root, new_id)
id_rec **root;
id_rec *new_id;
{
id_rec *A, *B;
/* If root is NULL, this where it is to be inserted. */
if (*root == NULL)
{
*root = new_id;
new_id->left = NULL;
new_id->right = NULL;
new_id->balance = 0;
return (TRUE);
}
/* We need to search for a leaf. */
if (strcmp (new_id->id, (*root)->id) < 0)
{
/* Insert it on the left. */
if (insert_id_rec (&((*root)->left), new_id))
{
/* The height increased. */
(*root)->balance --;
switch ((*root)->balance)
{
case 0: /* no height increase. */
return (FALSE);
case -1: /* height increase. */
return (FALSE);
case -2: /* we need to do a rebalancing act. */
A = *root;
B = (*root)->left;
if (B->balance <= 0)
{
/* Single Rotate. */
A->left = B->right;
B->right = A;
*root = B;
A->balance = 0;
B->balance = 0;
}
else
{
/* Double Rotate. */
*root = B->right;
B->right = (*root)->left;
A->left = (*root)->right;
(*root)->left = B;
(*root)->right = A;
switch ((*root)->balance)
{
case -1:
A->balance = 1;
B->balance = 0;
break;
case 0:
A->balance = 0;
B->balance = 0;
break;
case 1:
A->balance = 0;
B->balance = -1;
break;
}
(*root)->balance = 0;
}
}
}
}
else
{
/* Insert it on the right. */
if (insert_id_rec (&((*root)->right), new_id))
{
/* The height increased. */
(*root)->balance ++;
switch ((*root)->balance)
{
case 0: /* no height increase. */
return (FALSE);
case 1: /* height increase. */
return (FALSE);
case 2: /* we need to do a rebalancing act. */
A = *root;
B = (*root)->right;
if (B->balance >= 0)
{
/* Single Rotate. */
A->right = B->left;
B->left = A;
*root = B;
A->balance = 0;
B->balance = 0;
}
else
{
/* Double Rotate. */
*root = B->left;
B->left = (*root)->right;
A->right = (*root)->left;
(*root)->left = A;
(*root)->right = B;
switch ((*root)->balance)
{
case -1:
A->balance = 0;
B->balance = 1;
break;
case 0:
A->balance = 0;
B->balance = 0;
break;
case 1:
A->balance = -1;
B->balance = 0;
break;
}
(*root)->balance = 0;
}
}
}
}
/* If we fall through to here, the tree did not grow in height. */
return (FALSE);
}
/* Initialize variables for the symbol table tree. */
void
init_tree()
{
name_tree = NULL;
next_array = 1;
next_func = 1;
next_var = 4; /* 0 => ibase, 1 => obase, 2 => scale, 3 => last. */
}
/* Lookup routines for symbol table names. */
int
lookup (name, namekind)
char *name;
int namekind;
{
id_rec *id;
/* Warn about non-standard name. */
if (strlen(name) != 1)
warn ("multiple letter name - %s", name);
/* Look for the id. */
id = find_id (name_tree, name);
if (id == NULL)
{
/* We need to make a new item. */
id = (id_rec *) bc_malloc (sizeof (id_rec));
id->id = strcopyof (name);
id->a_name = 0;
id->f_name = 0;
id->v_name = 0;
insert_id_rec (&name_tree, id);
}
/* Return the correct value. */
switch (namekind)
{
case ARRAY:
/* ARRAY variable numbers are returned as negative numbers. */
if (id->a_name != 0)
{
free (name);
return (-id->a_name);
}
id->a_name = next_array++;
a_names[id->a_name] = name;
if (id->a_name < MAX_STORE)
{
if (id->a_name >= a_count)
more_arrays ();
return (-id->a_name);
}
yyerror ("Too many array variables");
exit (1);
case FUNCT:
if (id->f_name != 0)
{
free(name);
return (id->f_name);
}
id->f_name = next_func++;
f_names[id->f_name] = name;
if (id->f_name < MAX_STORE)
{
if (id->f_name >= f_count)
more_functions ();
return (id->f_name);
}
yyerror ("Too many functions");
exit (1);
case SIMPLE:
if (id->v_name != 0)
{
free(name);
return (id->v_name);
}
id->v_name = next_var++;
v_names[id->v_name - 1] = name;
if (id->v_name <= MAX_STORE)
{
if (id->v_name >= v_count)
more_variables ();
return (id->v_name);
}
yyerror ("Too many variables");
exit (1);
}
}
/* Print the welcome banner. */
void
welcome()
{
#if !__minix
printf ("This is free software with ABSOLUTELY NO WARRANTY.\n");
printf ("For details type `warranty'. \n");
#endif
}
/* Print out the warranty information. */
void
warranty(prefix)
char *prefix;
{
printf ("\n%s%s\n\n", prefix, BC_VERSION);
printf ("%s%s%s%s%s%s%s%s%s%s%s",
" This program is free software; you can redistribute it and/or modify\n",
" it under the terms of the GNU General Public License as published by\n",
" the Free Software Foundation; either version 2 of the License , or\n",
" (at your option) any later version.\n\n",
" This program is distributed in the hope that it will be useful,\n",
" but WITHOUT ANY WARRANTY; without even the implied warranty of\n",
" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n",
" GNU General Public License for more details.\n\n",
" You should have received a copy of the GNU General Public License\n",
" along with this program. If not, write to the Free Software\n",
" Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.\n\n");
}
/* Print out the limits of this program. */
void
limits()
{
printf ("BC_BASE_MAX = %d\n", BC_BASE_MAX);
printf ("BC_DIM_MAX = %ld\n", (long) BC_DIM_MAX);
printf ("BC_SCALE_MAX = %d\n", BC_SCALE_MAX);
printf ("BC_STRING_MAX = %d\n", BC_STRING_MAX);
printf ("MAX Exponent = %ld\n", (long) LONG_MAX);
printf ("MAX code = %ld\n", (long) BC_MAX_SEGS * (long) BC_SEG_SIZE);
printf ("multiply digits = %ld\n", (long) LONG_MAX / (long) 90);
printf ("Number of vars = %ld\n", (long) MAX_STORE);
#ifdef OLD_EQ_OP
printf ("Old assignment operatiors are valid. (=-, =+, ...)\n");
#endif
}
/* bc_malloc will check the return value so all other places do not
have to do it! SIZE is the number of types to allocate. */
char *
bc_malloc (size)
int size;
{
char *ptr;
ptr = (char *) malloc (size);
if (ptr == NULL)
out_of_memory ();
return ptr;
}
/* The following routines are error routines for various problems. */
/* Malloc could not get enought memory. */
void
out_of_memory()
{
fprintf (stderr, "Fatal error: Out of memory for malloc.\n");
exit (1);
}
/* The standard yyerror routine. Built with variable number of argumnets. */
#ifndef VARARGS
#ifdef __STDC__
void
yyerror (char *str, ...)
#else
void
yyerror (str)
char *str;
#endif
#else
void
yyerror (str, va_alist)
char *str;
#endif
{
char *name;
va_list args;
#ifndef VARARGS
va_start (args, str);
#else
va_start (args);
#endif
if (is_std_in)
name = "(standard_in)";
else
name = g_argv[optind-1];
fprintf (stderr,"%s %d: ",name,line_no);
vfprintf (stderr, str, args);
fprintf (stderr, "\n");
had_error = TRUE;
va_end (args);
}
/* The routine to produce warnings about non-standard features
found during parsing. */
#ifndef VARARGS
#ifdef __STDC__
void
warn (char *mesg, ...)
#else
void
warn (mesg)
char *mesg;
#endif
#else
void
warn (mesg, va_alist)
char *mesg;
#endif
{
char *name;
va_list args;
#ifndef VARARGS
va_start (args, mesg);
#else
va_start (args);
#endif
if (std_only)
{
if (is_std_in)
name = "(standard_in)";
else
name = g_argv[optind-1];
fprintf (stderr,"%s %d: ",name,line_no);
vfprintf (stderr, mesg, args);
fprintf (stderr, "\n");
had_error = TRUE;
}
else
if (warn_not_std)
{
if (is_std_in)
name = "(standard_in)";
else
name = g_argv[optind-1];
fprintf (stderr,"%s %d: (Warning) ",name,line_no);
vfprintf (stderr, mesg, args);
fprintf (stderr, "\n");
}
va_end (args);
}
/* Runtime error will print a message and stop the machine. */
#ifndef VARARGS
#ifdef __STDC__
void
rt_error (char *mesg, ...)
#else
void
rt_error (mesg)
char *mesg;
#endif
#else
void
rt_error (mesg, va_alist)
char *mesg;
#endif
{
va_list args;
char error_mesg [255];
#ifndef VARARGS
va_start (args, mesg);
#else
va_start (args);
#endif
vsprintf (error_mesg, mesg, args);
va_end (args);
fprintf (stderr, "Runtime error (func=%s, adr=%d): %s\n",
f_names[pc.pc_func], pc.pc_addr, error_mesg);
runtime_error = TRUE;
}
/* A runtime warning tells of some action taken by the processor that
may change the program execution but was not enough of a problem
to stop the execution. */
#ifndef VARARGS
#ifdef __STDC__
void
rt_warn (char *mesg, ...)
#else
void
rt_warn (mesg)
char *mesg;
#endif
#else
void
rt_warn (mesg, va_alist)
char *mesg;
#endif
{
va_list args;
char error_mesg [255];
#ifndef VARARGS
va_start (args, mesg);
#else
va_start (args);
#endif
vsprintf (error_mesg, mesg, args);
va_end (args);
fprintf (stderr, "Runtime warning (func=%s, adr=%d): %s\n",
f_names[pc.pc_func], pc.pc_addr, error_mesg);
}
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