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How to create a memory leak in Java?
...ring, if the string is a substring, the leak is even worse (the underlying char[] is also leaked) - in Java 7 substring also copies the char[], so the later doesn't apply; @Daniel, no needs for votes, though.
I'll concentrate on threads to show the danger of unmanaged threads mostly, don't wish t...
What does the brk() system call do?
...;assert.h>
#include <unistd.h>
int main(void) {
void *b;
char *p, *end;
b = sbrk(0);
p = (char *)b;
end = p + 0x1000000;
brk(end);
while (p < end) {
*(p++) = 1;
}
brk(b);
return 0;
}
Tested on Ubuntu 18.04.
Virtual address space visual...
The definitive guide to form-based website authentication [closed]
...
A cryptographic hash should not be used for password storage because user-selected passwords are not strong enough (i.e. do not usually contain enough entropy) and a password guessing attack could be completed in a relatively short time by an attacker with access to the hashes. This is why KDFs are...
Why in Java 8 split sometimes removes empty strings at start of result array?
... grepcode, for version 7u40-b43 and 8-b132.
Java 7
public String[] split(CharSequence input, int limit) {
int index = 0;
boolean matchLimited = limit > 0;
ArrayList<String> matchList = new ArrayList<>();
Matcher m = matcher(input);
// Add segments before each ma...
【解决】double free or corruption (!prev) - C/C++ - 清泛网 - 专注C/C++及内核技术
...大小，在free的时候也会检测出来，报这个错误，如：
char* buf = malloc(5);
memcpy(buf, "123456", 6);
free(buf); //free时报此错误
实际项目中可能此类问题没法直观定位到，推荐使用gcc自带的 asan 检查内存错误。
asan 内存跟踪
Is “inline” without “static” or “extern” ever useful in C99?
...efore, the following example might not
behave as expected.
inline const char *saddr(void)
{
static const char name[] = "saddr";
return name;
}
int compare_name(void)
{
return saddr() == saddr(); // unspecified behavior
}
Since the implementation might use the inline definition f...
What does “fragment” mean in ANTLR?
... and results:
Alphabet.g4 (Case1)
grammar Alphabet;
content : (rule0|ANYCHAR)* EOF;
rule0 : RULE1 | RULE2 | RULE3 ;
RULE1 : [A-C]+ ;
RULE2 : [DEF]+ ;
RULE3 : ('G'|'H'|'I')+ ;
ANYCHAR : . -> skip;
Result:
# Input data (for reference)
# ABBCCCDDDDEEEEE ABCDE
# FFGGHHIIJJKK FGHIJK
# ABCDEF...
How can I repeat a character in Bash?
...seq prints one less than the number given, so that example will print 99 = characters.
– Camilo Martin
Jan 2 '14 at 16:10
13
...
GetNextDlgTabItem用法详解，回车替代Tab键切换控件焦点 - C/C++ - 清泛网 ...
... == VK_RETURN)
{
CWnd *wnd = GetFocus();
if (wnd != NULL)
{
char str[256];
CString ClassName = _T("Button");
GetClassName (wnd->m_hWnd, str, 256);
if (ClassName == str)
{
UINT i = wnd->GetDlgCtrlID();
SendMessage (WM_COMMAND, i, (LPARAM)wnd->m_hWnd);
CWn...
Regular Expression to match only alphabetic characters
...et a regular expression which will match a string that only has alphabetic characters, and that alone.
5 Answers
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