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dc: fix "dc p" prinitng bogus data

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function                                             old     new   delta
check_under                                            -      20     +20
print_no_pop                                          27      32      +5
pop                                                   33      24      -9
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/1 up/down: 25/-9)              Total: 16 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2015-05-25 13:31:25 +02:00
parent b878121e76
commit c4603fb09a
1 changed files with 8 additions and 2 deletions
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10
miscutils/dc.c
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@ -56,6 +56,12 @@ enum { STACK_SIZE = (COMMON_BUFSIZE - offsetof(struct globals, stack)) / sizeof(
} while (0) } while (0)
static void check_under(void)
{
if (pointer == 0)
bb_error_msg_and_die("stack underflow");
}
static void push(double a) static void push(double a)
{ {
if (pointer >= STACK_SIZE) if (pointer >= STACK_SIZE)
@ -65,8 +71,7 @@ static void push(double a)
static double pop(void) static double pop(void)
{ {
if (pointer == 0) check_under();
bb_error_msg_and_die("stack underflow");
return stack[--pointer]; return stack[--pointer];
} }
@ -187,6 +192,7 @@ static void print_stack_no_pop(void)
static void print_no_pop(void) static void print_no_pop(void)
{ {
check_under();
print_base(stack[pointer-1]); print_base(stack[pointer-1]);
} }