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Ok, instead of covering up the problem, let's fix it.

Browse source 
Reinstate the ability to use directories as input files
and make dc print an error message when trying to
lookup/set the value of an invalid register.

Suggested by: bde
This commit is contained in:
Steve Price 1996-11-03 16:18:58 +00:00
parent 07404e964a
commit 2cde372bc2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=19366
1 changed files with 26 additions and 16 deletions
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42
gnu/usr.bin/dc/dc.c
View file

@ -19,7 +19,6 @@
* Inc.; 675 Mass Ave. Cambridge, MA 02139, USA.
*/
#include <sys/stat.h>
#include <stdio.h>
#include "decimal.h" /* definitions for our decimal arithmetic package */
@ -37,8 +36,9 @@ typedef struct regstack *regstack;
regstack freeregstacks; /* Chain of free regstack structures for fast realloc */
decimal regs[128]; /* "registers", with single-character names */
regstack regstacks[128]; /* For each register, a stack of previous values */
#define DC_MAX_REG 127
decimal regs[DC_MAX_REG + 1]; /* "registers", with single-character names */
regstack regstacks[DC_MAX_REG + 1]; /* For each register, a stack of previous values */
int stacktop; /* index of last used element in stack */
int stacksize; /* Current allocates size of stack */
@ -221,7 +221,7 @@ execute ()
{
int regno;
int somereg = 0; /* set to 1 if we print any registers */
for (regno = 0; regno < 128; regno++)
for (regno = 0; regno <= DC_MAX_REG; regno++)
{
if (regs[regno])
{
@ -266,9 +266,11 @@ execute ()
case 'l': /* l<x> load register <x> onto stack */
{
char c1 = fetch ();
int c1 = fetch ();
if (c1 < 0) exit (0);
if (!regs[c1])
if (c1 > DC_MAX_REG)
error ("invalid register %c", c1);
else if (!regs[c1])
error ("register %c empty", c1);
else
push (regs[c1]);
@ -277,9 +279,11 @@ execute ()
case 'L': /* L<x> load register <x> to stack, pop <x>'s own stack */
{
char c1 = fetch ();
int c1 = fetch ();
if (c1 < 0) exit (0);
if (!regstacks[c1])
if (c1 > DC_MAX_REG)
error ("invalid register %c", c1);
else if (!regstacks[c1])
error ("nothing pushed on register %c", c1);
else
{
@ -336,8 +340,13 @@ execute ()
{
int c1 = fetch ();
if (c1 < 0) exit (0);
if (c1 > DC_MAX_REG)
error("invalid register %c", c1);
else
{
if (regs[c1]) decref (regs[c1]);
regs[c1] = stack[stacktop--];
}
}
break;
@ -348,8 +357,13 @@ execute ()
{
int c1 = fetch ();
if (c1 < 0) exit (0);
if (c1 > DC_MAX_REG)
error("invalid register %c", c1);
else
{
pushreg (c1);
regs[c1] = stack[stacktop--];
}
}
break;
@ -466,7 +480,9 @@ condop (cond)
int cond;
{
int regno = fetch ();
if (!regs[regno])
if (regno > DC_MAX_REG)
error ("invalid register %c", regno);
else if (!regs[regno])
error ("register %c is empty", regno);
else if (stacktop < 1)
empty ();
@ -509,16 +525,10 @@ fetch()
}
else if (file_count)
{
struct stat stat_buf;
file_count--;
if (stat(*next_file, &stat_buf) == 0) && !S_ISDIR(stat_buf.st_mode))
{
open_file = fopen (*next_file++, "r");
file_count--;
if (!open_file)
perror_with_name (*(next_file - 1));
}
else
next_file++;
}
else break;
}