bc: bump version to 1.06.95

The current version of bc being used (1.06) is from 2000 and contains a
serious bug causing it to segfault when the math library is used, so bump to
the latest alpha release, which is also 9 years old.

Also include two fixes for Debian (https://packages.debian.org/jessie/bc)

- A patch to fix array initialization by Phul Nelson
- A patch to get bc to notice I/O errors by Ian Jackson

[Peter: fixup white space and tweak commit message]
Signed-off-by: Robert Sohn <grepper@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

4 files changed, 732 insertions, 3 deletions

diff --git a/package/bc/01_array_initialize.patch b/package/bc/01_array_initialize.patch
new file mode 100644
index 000000000..9520d824a
--- /dev/null
+++ b/package/bc/01_array_initialize.patch
@@ -0,0 +1,20 @@
+Description: Fix array initialization bug
+Author: Phil Nelson
+Origin: upstream
+Bug-Debian: http://bugs.debian.org/586969
+Bug-Debian: http://bugs.debian.org/671513
+---
+This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
+Index: bc/bc/storage.c
+===================================================================
+--- bc.orig/bc/storage.c	2013-06-02 20:34:09.401273864 -0400
++++ bc/bc/storage.c	2013-06-02 20:34:11.000000000 -0400
+@@ -179,7 +179,7 @@
+ 
+ 
+   /* Initialize the new elements. */
+-  for (; indx < v_count; indx++)
++  for (; indx < a_count; indx++)
+     arrays[indx] = NULL;
+ 
+   /* Free the old elements. */
diff --git a/package/bc/02_notice_read_write_errors.patch b/package/bc/02_notice_read_write_errors.patch
new file mode 100644
index 000000000..73e6ec91c
--- /dev/null
+++ b/package/bc/02_notice_read_write_errors.patch
@@ -0,0 +1,708 @@
+Description: notice read and write errors on input and output
+ Quoting from the bug report:
+    +bc (1.06-19ubuntu1) dapper; urgency=low
+    +
+    +  * Make dc notice read and write errors on its input and output.
+    +    I grepped for mentions of the strings `putc', `print', `getc', `FILE',
+    +    `stdin', `stdout' and `stderr' and added calls to new error-checking
+    +    functions unless it was clear from the immediately-surrounding code
+    +    that the program was exiting nonzero, or would exit nonzero if the
+    +    call failed.  I ignored hits in lib/getopt*, which seems to
+    +    pervasively ignore write errors when printing usage messages, in the
+    +    hope that these were correct.  I _think_ I got them all.  -iwj.
+    +
+    + -- Ian Jackson <iwj@ubuntu.com>  Tue,  4 Apr 2006 17:21:02 +0100
+Author: Ian Jackson <iwj@ubuntu.com>
+Origin: other
+Bug-Debian: http://bugs.debian.org/488735
+---
+This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
+diff --git a/bc/execute.c b/bc/execute.c
+index e4e8ef7..8787048 100644
+--- a/bc/execute.c
++++ b/bc/execute.c
+@@ -108,6 +108,7 @@ execute ()
+ 	      }
+ 	    out_char ('\n');
+ 	  }
++	checkferror_output(stdout);
+       }
+ #endif
+ 
+@@ -222,6 +223,7 @@ execute ()
+ 		}
+ 	    }
+ 	fflush (stdout);
++	checkferror_output(stdout);
+ 	break;
+ 
+       case 'R' : /* Return from function */
+@@ -257,6 +259,7 @@ execute ()
+ 	if (inst == 'W') out_char ('\n');
+ 	store_var (4);  /* Special variable "last". */
+ 	fflush (stdout);
++	checkferror_output(stdout);
+ 	pop ();
+ 	break;
+ 
+@@ -338,6 +341,7 @@ execute ()
+       case 'w' : /* Write a string to the output. */
+ 	while ((ch = byte(&pc)) != '"') out_schar (ch);
+ 	fflush (stdout);
++	checkferror_output(stdout);
+ 	break;
+ 		   
+       case 'x' : /* Exchange Top of Stack with the one under the tos. */
+@@ -545,7 +549,10 @@ execute ()
+     {
+       signal (SIGINT, use_quit);
+       if (had_sigint)
+-	printf ("\ninterrupted execution.\n");
++	{
++	  printf ("\ninterrupted execution.\n");
++	  checkferror_output(stdout);
++	}
+     }
+ }
+ 
+@@ -580,6 +587,7 @@ input_char ()
+ 	  out_col = 0;  /* Saw a new line */
+ 	}
+     }
++  checkferror_input(stdin);
+ 
+   /* Classify and preprocess the input character. */
+   if (isdigit(in_ch))
+diff --git a/bc/load.c b/bc/load.c
+index 1035198..4039e86 100644
+--- a/bc/load.c
++++ b/bc/load.c
+@@ -217,6 +217,7 @@ load_code (code)
+ 		if (label_no > 65535L)
+ 		  {  /* Better message? */
+ 		    fprintf (stderr,"Program too big.\n");
++		    checkferror_output(stderr);
+ 		    exit(1);
+ 		  }
+ 		addbyte ( (char) (label_no & 0xFF));
+diff --git a/bc/main.c b/bc/main.c
+index 9a2461e..3ae427d 100644
+--- a/bc/main.c
++++ b/bc/main.c
+@@ -358,6 +358,9 @@ use_quit (sig)
+   errno = save;
+ #else
+   write (1, "\n(interrupt) Exiting bc.\n", 26);
++#ifdef READLINE
++  rl_initialize (); /* Clear readline buffer */
++#endif
+ #if defined(LIBEDIT)
+   if (edit != NULL)
+     el_end(edit);
+diff --git a/bc/sbc.y b/bc/sbc.y
+index 0ded29e..6fcc1fa 100644
+--- a/bc/sbc.y
++++ b/bc/sbc.y
+@@ -86,7 +86,9 @@ program			: /* empty */
+ 			      if (interactive && !quiet)
+ 				{
+ 				  show_bc_version ();
++				  checkferror_output(stdout);
+ 				  welcome ();
++				  checkferror_output(stdout);
+ 				}
+ 			    }
+ 			| program input_item
+diff --git a/bc/scan.c b/bc/scan.c
+index 1f78ec2..2b5eeb4 100644
+--- a/bc/scan.c
++++ b/bc/scan.c
+@@ -799,6 +799,7 @@ bcel_input (buf, result, max)
+       if (bcel_len != 0)
+ 	history (hist, &histev, H_ENTER, bcel_line); 
+       fflush (stdout);
++      checkferror_output(stdout);
+     }
+ 
+   if (bcel_len <= max)
+@@ -874,6 +875,7 @@ rl_input (buf, result, max)
+ 	add_history (rl_line); 
+       rl_line[rl_len-1] = '\n';
+       fflush (stdout);
++      checkferror_output(stdout);
+     }
+ 
+   if (rl_len <= max)
+diff --git a/bc/scan.l b/bc/scan.l
+index 841c3df..16cd62e 100644
+--- a/bc/scan.l
++++ b/bc/scan.l
+@@ -111,6 +111,7 @@ bcel_input (buf, result, max)
+       if (bcel_len != 0)
+ 	history (hist, &histev, H_ENTER, bcel_line); 
+       fflush (stdout);
++      checkferror_output(stdout);
+     }
+ 
+   if (bcel_len <= max)
+@@ -186,6 +187,7 @@ rl_input (buf, result, max)
+ 	add_history (rl_line); 
+       rl_line[rl_len-1] = '\n';
+       fflush (stdout);
++      checkferror_output(stdout);
+     }
+ 
+   if (rl_len <= max)
+@@ -310,6 +312,7 @@ limits return(Limits);
+ 	    if (c == EOF)
+ 	      {
+ 		fprintf (stderr,"EOF encountered in a comment.\n");
++                checkferror_output(stderr);
+ 		break;
+ 	      }
+ 	  }
+diff --git a/bc/storage.c b/bc/storage.c
+index 699729a..37b4c6c 100644
+--- a/bc/storage.c
++++ b/bc/storage.c
+@@ -99,6 +99,7 @@ more_functions (VOID)
+     {
+       f = &functions[indx];
+       f->f_defined = FALSE;
++      f->f_void = FALSE;
+       f->f_body = (char *) bc_malloc (BC_START_SIZE);
+       f->f_body_size = BC_START_SIZE;
+       f->f_code_size = 0;
+diff --git a/bc/util.c b/bc/util.c
+index 30beaf9..669235f 100644
+--- a/bc/util.c
++++ b/bc/util.c
+@@ -260,9 +260,10 @@ init_gen ()
+   continue_label = 0;
+   next_label  = 1;
+   out_count = 2;
+-  if (compile_only) 
++  if (compile_only) {
+     printf ("@i");
+-  else
++    checkferror_output(stdout);
++  } else
+     init_load ();
+   had_error = FALSE;
+   did_gen = FALSE;
+@@ -286,6 +287,7 @@ generate (str)
+ 	  printf ("\n");
+ 	  out_count = 0;
+ 	}
++      checkferror_output(stdout);
+     }
+   else
+     load_code (str);
+@@ -303,6 +305,7 @@ run_code()
+       if (compile_only)
+ 	{
+ 	  printf ("@r\n"); 
++	  checkferror_output(stdout);
+ 	  out_count = 0;
+ 	}
+       else
+@@ -341,6 +344,7 @@ out_char (ch)
+ 	}
+       putchar (ch);
+     }
++  checkferror_output(stdout);
+ }
+ 
+ /* Output routines: Write a character CH to the standard output.
+@@ -371,6 +375,7 @@ out_schar (ch)
+ 	}
+       putchar (ch);
+     }
++  checkferror_output(stdout);
+ }
+ 
+ 
+@@ -657,6 +662,7 @@ limits()
+ #ifdef OLD_EQ_OP
+   printf ("Old assignment operatiors are valid. (=-, =+, ...)\n");
+ #endif 
++  checkferror_output(stdout);
+ }
+ 
+ /* bc_malloc will check the return value so all other places do not
+@@ -721,6 +727,7 @@ yyerror (str, va_alist)
+   fprintf (stderr,"%s %d: ",name,line_no);
+   vfprintf (stderr, str, args);
+   fprintf (stderr, "\n");
++  checkferror_output(stderr);
+   had_error = TRUE;
+   va_end (args);
+ }
+@@ -761,6 +768,7 @@ warn (mesg, va_alist)
+       fprintf (stderr,"%s %d: Error: ",name,line_no);
+       vfprintf (stderr, mesg, args);
+       fprintf (stderr, "\n");
++      checkferror_output(stderr);
+       had_error = TRUE;
+     }
+   else
+@@ -773,6 +781,7 @@ warn (mesg, va_alist)
+ 	fprintf (stderr,"%s %d: (Warning) ",name,line_no);
+ 	vfprintf (stderr, mesg, args);
+ 	fprintf (stderr, "\n");
++	checkferror_output(stderr);
+       }
+   va_end (args);
+ }
+@@ -807,6 +816,7 @@ rt_error (mesg, va_alist)
+   va_end (args);
+   
+   fprintf (stderr, "\n");
++  checkferror_output(stderr);
+   runtime_error = TRUE;
+ }
+ 
+@@ -843,4 +853,5 @@ rt_warn (mesg, va_alist)
+   va_end (args);
+ 
+   fprintf (stderr, "\n");
++  checkferror_output(stderr);
+ }
+diff --git a/dc/dc.c b/dc/dc.c
+index e03f094..0faf03a 100644
+--- a/dc/dc.c
++++ b/dc/dc.c
+@@ -61,6 +61,7 @@ static void
+ bug_report_info DC_DECLVOID()
+ {
+ 	printf("Email bug reports to:  bug-dc@gnu.org .\n");
++	checkferror_output(stdout);
+ }
+ 
+ static void
+@@ -71,6 +72,7 @@ show_version DC_DECLVOID()
+ This is free software; see the source for copying conditions.  There is NO\n\
+ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,\n\
+ to the extent permitted by law.\n", DC_COPYRIGHT);
++	checkferror_output(stdout);
+ }
+ 
+ /* your generic usage function */
+@@ -87,6 +89,7 @@ Usage: %s [OPTION] [file ...]\n\
+ \n\
+ ", progname);
+ 	bug_report_info();
++	checkferror_output(f);
+ }
+ 
+ /* returns a pointer to one past the last occurance of c in s,
+diff --git a/dc/eval.c b/dc/eval.c
+index 4af7200..153d331 100644
+--- a/dc/eval.c
++++ b/dc/eval.c
+@@ -94,12 +94,15 @@ static int input_pushback;
+ static int
+ input_fil DC_DECLVOID()
+ {
++        int c;
+ 	if (input_pushback != EOF){
+-		int c = input_pushback;
++		c = input_pushback;
+ 		input_pushback = EOF;
+ 		return c;
+ 	}
+-	return getc(input_fil_fp);
++	c = getc(input_fil_fp);
++	checkferror_input(input_fil_fp);
++	return c;
+ }
+ 
+ /* passed as an argument to dc_getnum */
+@@ -298,11 +301,13 @@ dc_func DC_DECLARG((c, peekc, negcmp))
+ 				tmpint = dc_num2int(datum.v.number, DC_TOSS);
+ 			if (2 <= tmpint  &&  tmpint <= DC_IBASE_MAX)
+ 				dc_ibase = tmpint;
+-			else
++			else {
+ 				fprintf(stderr,
+ 						"%s: input base must be a number \
+ between 2 and %d (inclusive)\n",
+ 						progname, DC_IBASE_MAX);
++				checkferror_output(stderr);
++			}
+ 		}
+ 		break;
+ 	case 'k':	/* set scale to value on top of stack */
+@@ -310,11 +315,12 @@ between 2 and %d (inclusive)\n",
+ 			tmpint = -1;
+ 			if (datum.dc_type == DC_NUMBER)
+ 				tmpint = dc_num2int(datum.v.number, DC_TOSS);
+-			if ( ! (tmpint >= 0) )
++			if ( ! (tmpint >= 0) ) {
+ 				fprintf(stderr,
+ 						"%s: scale must be a nonnegative number\n",
+ 						progname);
+-			else
++				checkferror_output(stderr);
++			} else
+ 				dc_scale = tmpint;
+ 		}
+ 		break;
+@@ -338,11 +344,12 @@ between 2 and %d (inclusive)\n",
+ 			tmpint = 0;
+ 			if (datum.dc_type == DC_NUMBER)
+ 				tmpint = dc_num2int(datum.v.number, DC_TOSS);
+-			if ( ! (tmpint > 1) )
++			if ( ! (tmpint > 1) ) {
+ 				fprintf(stderr,
+ 						"%s: output base must be a number greater than 1\n",
+ 						progname);
+-			else
++				checkferror_output(stderr);
++			} else
+ 				dc_obase = tmpint;
+ 		}
+ 		break;
+@@ -383,6 +390,7 @@ between 2 and %d (inclusive)\n",
+ 				fprintf(stderr,
+ 						"%s: square root of nonnumeric attempted\n",
+ 						progname);
++				checkferror_output(stderr);
+ 			}else if (dc_sqrt(datum.v.number, dc_scale, &tmpnum) == DC_SUCCESS){
+ 				dc_free_num(&datum.v.number);
+ 				datum.v.number = tmpnum;
+@@ -444,6 +452,7 @@ between 2 and %d (inclusive)\n",
+ 			fprintf(stderr,
+ 					"%s: Q command requires a number >= 1\n",
+ 					progname);
++			checkferror_output(stderr);
+ 		}
+ 		break;
+ #if 0
+@@ -489,11 +498,12 @@ between 2 and %d (inclusive)\n",
+ 			if (datum.dc_type == DC_NUMBER)
+ 				tmpint = dc_num2int(datum.v.number, DC_TOSS);
+ 			if (dc_pop(&datum) == DC_SUCCESS){
+-				if (tmpint < 0)
++				if (tmpint < 0) {
+ 					fprintf(stderr,
+ 							"%s: array index must be a nonnegative integer\n",
+ 							progname);
+-				else
++					checkferror_output(stderr);
++				} else
+ 					dc_array_set(peekc, tmpint, datum);
+ 			}
+ 		}
+@@ -505,17 +515,19 @@ between 2 and %d (inclusive)\n",
+ 			tmpint = -1;
+ 			if (datum.dc_type == DC_NUMBER)
+ 				tmpint = dc_num2int(datum.v.number, DC_TOSS);
+-			if (tmpint < 0)
++			if (tmpint < 0) {
+ 				fprintf(stderr,
+ 						"%s: array index must be a nonnegative integer\n",
+ 						progname);
+-			else
++				checkferror_output(stderr);
++			} else
+ 				dc_push(dc_array_get(peekc, tmpint));
+ 		}
+ 		return DC_EATONE;
+ 
+ 	default:	/* What did that user mean? */
+ 		fprintf(stderr, "%s: ", progname);
++		checkferror_output(stderr);
+ 		dc_show_id(stdout, c, " unimplemented\n");
+ 		break;
+ 	}
+@@ -544,6 +556,7 @@ dc_evalstr DC_DECLARG((string))
+ 		fprintf(stderr,
+ 				"%s: eval called with non-string argument\n",
+ 				progname);
++		checkferror_output(stderr);
+ 		return DC_OKAY;
+ 	}
+ 	interrupt_seen = 0;
+@@ -640,6 +653,7 @@ dc_evalstr DC_DECLARG((string))
+ 				return DC_FAIL;
+ 			}
+ 			fprintf(stderr, "%s: unexpected EOS\n", progname);
++			checkferror_output(stderr);
+ 			return DC_OKAY;
+ 		}
+ 	}
+@@ -665,6 +679,7 @@ dc_evalfile DC_DECLARG((fp))
+ 	stdin_lookahead = EOF;
+ 	for (c=getc(fp); c!=EOF; c=peekc){
+ 		peekc = getc(fp);
++		checkferror_input(stdin);
+ 		/*
+ 		 * The following if() is the only place where ``stdin_lookahead''
+ 		 * might be set to other than EOF:
+@@ -716,6 +731,7 @@ dc_evalfile DC_DECLARG((fp))
+ 							return DC_SUCCESS;
+ 						fprintf(stderr, "%s: Q command argument exceeded \
+ string execution depth\n", progname);
++						checkferror_output(stderr);
+ 					}
+ 				}else{
+ 					dc_garbage("at top of stack", -1);
+@@ -728,8 +744,11 @@ string execution depth\n", progname);
+ 			fprintf(stderr,
+ 					"%s: Q command argument exceeded string execution depth\n",
+ 					progname);
+-			if (stdin_lookahead != peekc  &&  fp == stdin)
++			checkferror_output(stderr);
++			if (stdin_lookahead != peekc  &&  fp == stdin) {
+ 				peekc = getc(fp);
++				checkferror_input(stdin);
++			}
+ 			break;
+ 
+ 		case DC_INT:
+@@ -771,6 +790,7 @@ string execution depth\n", progname);
+ 			if (ferror(fp))
+ 				goto error_fail;
+ 			fprintf(stderr, "%s: unexpected EOF\n", progname);
++			checkferror_output(stderr);
+ 			return DC_FAIL;
+ 		}
+ 	}
+diff --git a/dc/misc.c b/dc/misc.c
+index f2388b0..1be56fe 100644
+--- a/dc/misc.c
++++ b/dc/misc.c
+@@ -91,6 +91,7 @@ dc_show_id DC_DECLARG((fp, id, suffix))
+ 		fprintf(fp, "'%c' (%#o)%s", (unsigned int) id, id, suffix);
+ 	else
+ 		fprintf(fp, "%#o%s", (unsigned int) id, suffix);
++	checkferror_output(fp);
+ }
+ 
+ 
+diff --git a/dc/numeric.c b/dc/numeric.c
+index 8e5e70f..c875eba 100644
+--- a/dc/numeric.c
++++ b/dc/numeric.c
+@@ -134,6 +134,7 @@ dc_div DC_DECLARG((a, b, kscale, result))
+ 	bc_init_num(CastNumPtr(result));
+ 	if (bc_divide(CastNum(a), CastNum(b), CastNumPtr(result), kscale)){
+ 		fprintf(stderr, "%s: divide by zero\n", progname);
++		checkferror_output(stderr);
+ 		return DC_DOMAIN_ERROR;
+ 	}
+ 	return DC_SUCCESS;
+@@ -156,6 +157,7 @@ dc_divrem DC_DECLARG((a, b, kscale, quotient, remainder))
+ 	if (bc_divmod(CastNum(a), CastNum(b),
+ 						CastNumPtr(quotient), CastNumPtr(remainder), kscale)){
+ 		fprintf(stderr, "%s: divide by zero\n", progname);
++		checkferror_output(stderr);
+ 		return DC_DOMAIN_ERROR;
+ 	}
+ 	return DC_SUCCESS;
+@@ -174,6 +176,7 @@ dc_rem DC_DECLARG((a, b, kscale, result))
+ 	bc_init_num(CastNumPtr(result));
+ 	if (bc_modulo(CastNum(a), CastNum(b), CastNumPtr(result), kscale)){
+ 		fprintf(stderr, "%s: remainder by zero\n", progname);
++		checkferror_output(stderr);
+ 		return DC_DOMAIN_ERROR;
+ 	}
+ 	return DC_SUCCESS;
+@@ -226,6 +229,7 @@ dc_sqrt DC_DECLARG((value, kscale, result))
+ 	tmp = bc_copy_num(CastNum(value));
+ 	if (!bc_sqrt(&tmp, kscale)){
+ 		fprintf(stderr, "%s: square root of negative number\n", progname);
++		checkferror_output(stderr);
+ 		bc_free_num(&tmp);
+ 		return DC_DOMAIN_ERROR;
+ 	}
+@@ -429,8 +433,10 @@ dc_out_num DC_DECLARG((value, obase, newline_p, discard_p))
+ {
+ 	out_char('\0'); /* clear the column counter */
+ 	bc_out_num(CastNum(value), obase, out_char, 0);
+-	if (newline_p == DC_WITHNL)
++	if (newline_p == DC_WITHNL) {
+ 		putchar ('\n');
++		checkferror_output(stdout);
++	}
+ 	if (discard_p == DC_TOSS)
+ 		dc_free_num(&value);
+ }
+@@ -475,6 +481,7 @@ dc_dump_num DC_DECLARG((dcvalue, discard_p))
+ 
+ 	for (cur=top_of_stack; cur; cur=next) {
+ 		putchar(cur->digit);
++		checkferror_output(stdout);
+ 		next = cur->link;
+ 		free(cur);
+ 	}
+@@ -592,6 +599,7 @@ out_char (ch)
+ 			out_col = 1;
+ 		}
+ 		putchar(ch);
++		checkferror_output(stderr);
+ 	}
+ }
+ 
+@@ -631,6 +639,7 @@ rt_error (mesg, va_alist)
+ 	vfprintf (stderr, mesg, args);
+ 	va_end (args);
+ 	fprintf (stderr, "\n");
++	checkferror_output(stderr);
+ }
+ 
+ 
+@@ -664,6 +673,7 @@ rt_warn (mesg, va_alist)
+ 	vfprintf (stderr, mesg, args);
+ 	va_end (args);
+ 	fprintf (stderr, "\n");
++	checkferror_output(stderr);
+ }
+ 
+ 
+diff --git a/dc/stack.c b/dc/stack.c
+index 0730e9c..5db3975 100644
+--- a/dc/stack.c
++++ b/dc/stack.c
+@@ -38,7 +38,10 @@
+ #include "dc-regdef.h"
+ 
+ /* an oft-used error message: */
+-#define Empty_Stack	fprintf(stderr, "%s: stack empty\n", progname)
++#define Empty_Stack do{					\
++    fprintf(stderr, "%s: stack empty\n", progname);	\
++    checkferror_output(stderr);				\
++  }while(0)
+ 
+ 
+ /* simple linked-list implementation suffices: */
+@@ -94,6 +97,7 @@ dc_binop DC_DECLARG((op, kscale))
+ 	if (dc_stack->value.dc_type!=DC_NUMBER
+ 			|| dc_stack->link->value.dc_type!=DC_NUMBER){
+ 		fprintf(stderr, "%s: non-numeric value\n", progname);
++		checkferror_output(stderr);
+ 		return;
+ 	}
+ 	(void)dc_pop(&b);
+@@ -134,6 +138,7 @@ dc_binop2 DC_DECLARG((op, kscale))
+ 	if (dc_stack->value.dc_type!=DC_NUMBER
+ 			|| dc_stack->link->value.dc_type!=DC_NUMBER){
+ 		fprintf(stderr, "%s: non-numeric value\n", progname);
++		checkferror_output(stderr);
+ 		return;
+ 	}
+ 	(void)dc_pop(&b);
+@@ -172,6 +177,7 @@ dc_cmpop DC_DECLVOID()
+ 	if (dc_stack->value.dc_type!=DC_NUMBER
+ 			|| dc_stack->link->value.dc_type!=DC_NUMBER){
+ 		fprintf(stderr, "%s: non-numeric value\n", progname);
++		checkferror_output(stderr);
+ 		return 0;
+ 	}
+ 	(void)dc_pop(&b);
+@@ -209,6 +215,7 @@ dc_triop DC_DECLARG((op, kscale))
+ 			|| dc_stack->link->value.dc_type!=DC_NUMBER
+ 			|| dc_stack->link->link->value.dc_type!=DC_NUMBER){
+ 		fprintf(stderr, "%s: non-numeric value\n", progname);
++		checkferror_output(stderr);
+ 		return;
+ 	}
+ 	(void)dc_pop(&c);
+@@ -327,6 +334,7 @@ dc_register_get DC_DECLARG((regid, result))
+ 	r = dc_register[regid];
+ 	if (r==NULL || r->value.dc_type==DC_UNINITIALIZED){
+ 		fprintf(stderr, "%s: register ", progname);
++		checkferror_output(stderr);
+ 		dc_show_id(stderr, regid, " is empty\n");
+ 		return DC_FAIL;
+ 	}
+@@ -401,6 +409,7 @@ dc_register_pop DC_DECLARG((stackid, result))
+ 	r = dc_register[stackid];
+ 	if (r == NULL){
+ 		fprintf(stderr, "%s: stack register ", progname);
++		checkferror_output(stderr);
+ 		dc_show_id(stderr, stackid, " is empty\n");
+ 		return DC_FAIL;
+ 	}
+diff --git a/dc/string.c b/dc/string.c
+index ff1e7f1..e24092d 100644
+--- a/dc/string.c
++++ b/dc/string.c
+@@ -101,6 +101,7 @@ dc_out_str DC_DECLARG((value, newline, discard_flag))
+ 	fwrite(value->s_ptr, value->s_len, sizeof *value->s_ptr, stdout);
+ 	if (newline == DC_WITHNL)
+ 		putchar('\n');
++	checkferror_output(stdout);
+ 	if (discard_flag == DC_TOSS)
+ 		dc_free_str(&value);
+ }
+@@ -176,6 +177,7 @@ dc_readstring DC_DECLARG((fp, ldelim, rdelim))
+ 		}
+ 		*p++ = c;
+ 	}
++	checkferror_input(fp);
+ 	return dc_makestring(line_buf, (size_t)(p-line_buf));
+ }
+ 
+diff --git a/h/number.h b/h/number.h
+index 9b034b6..3a00a92 100644
+--- a/h/number.h
++++ b/h/number.h
+@@ -150,4 +150,7 @@ _PROTOTYPE(int bc_sqrt, (bc_num *num, int scale));
+ _PROTOTYPE(void bc_out_num, (bc_num num, int o_base, void (* out_char)(int),
+ 			     int leading_zero));
+ 
++_PROTOTYPE(void checkferror_input, (FILE*));
++_PROTOTYPE(void checkferror_output, (FILE*));
++
+ #endif
+diff --git a/lib/number.c b/lib/number.c
+index e211840..4d3ce46 100644
+--- a/lib/number.c
++++ b/lib/number.c
+@@ -1776,6 +1776,7 @@ static void
+ out_char (int c)
+ {
+   putchar(c);
++  checkferror_output(stdout);
+ }
+ 
+ 
+@@ -1785,6 +1786,7 @@ pn (num)
+ {
+   bc_out_num (num, 10, out_char, 0);
+   out_char ('\n');
++  checkferror_output(stdout);
+ }
+ 
+ 
+@@ -1799,6 +1801,28 @@ pv (name, num, len)
+   printf ("%s=", name);
+   for (i=0; i<len; i++) printf ("%c",BCD_CHAR(num[i]));
+   printf ("\n");
++  checkferror_output(stdout);
+ }
+ 
+ #endif
++
++/* check ferror() status and if so die */
++void
++checkferror_input (fp)
++	FILE *fp;
++{
++	if (ferror(fp)) {
++		perror("dc: could not read input file");
++		exit(EXIT_FAILURE);
++	}
++}
++
++void
++checkferror_output (fp)
++	FILE *fp;
++{
++	if (ferror(fp)) {
++		perror("dc: could not write output file");
++		exit(EXIT_FAILURE);
++	}
++}
diff --git a/package/bc/bc.hash b/package/bc/bc.hash
index 241e9a2f9..5f1ed6353 100644
--- a/package/bc/bc.hash
+++ b/package/bc/bc.hash
@@ -1,2 +1,2 @@
 # Locally calculated
-sha256	4ef6d9f17c3c0d92d8798e35666175ecd3d8efac4009d6457b5c99cea72c0e33  bc-1.06.tar.gz
+sha256 7ee4abbcfac03d8a6e1a8a3440558a3d239d6b858585063e745c760957725ecc  bc-1.06.95.tar.bz2
diff --git a/package/bc/bc.mk b/package/bc/bc.mk
index 60530bda9..146c472da 100644
--- a/package/bc/bc.mk
+++ b/package/bc/bc.mk
@@ -4,8 +4,9 @@
 #
 ################################################################################
 
-BC_VERSION = 1.06
-BC_SITE = $(BR2_GNU_MIRROR)/bc
+BC_VERSION = 1.06.95
+BC_SOURCE = bc-$(BC_VERSION).tar.bz2
+BC_SITE = http://alpha.gnu.org/gnu/bc
 BC_DEPENDENCIES = host-flex
 BC_LICENSE = GPLv2+ LGPLv2.1+
 BC_LICENSE_FILES = COPYING COPYING.LIB