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Get the IP address of the machine

... <string.h> #include <arpa/inet.h> int main (int argc, const char * argv[]) { struct ifaddrs * ifAddrStruct=NULL; struct ifaddrs * ifa=NULL; void * tmpAddrPtr=NULL; getifaddrs(&ifAddrStruct); for (ifa = ifAddrStruct; ifa != NULL; ifa = ifa->ifa_next) { ...
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How to get first character of a string in SQL?

I have a SQL column with a length of 6. Now want to take only the first char of that column. Is there any string function in SQL to do this? ...
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How to ignore whitespace in a regular expression subject string?

... You can stick optional whitespace characters \s* in between every other character in your regex. Although granted, it will get a bit lengthy. /cats/ -> /c\s*a\s*t\s*s/ share ...
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The opposite of Intersect()

...nitial, final); // sum and return the two set. return setA.Concat(setB); } } share | improve this answer | follow | ...
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Insert spaces between words on a camel-cased token [duplicate]

...e Stuff And Sell It (IIRC). Syntax explanation (credit): {Ll} is Unicode Character Category "Letter lowercase" (as opposed to {Lu} "Letter uppercase"). P is a negative match, while p is a positive match, so \P{Ll} is literally "Not lowercase" and p{Ll} is "Lowercase". So this regex splits on two p...
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How to match “any character” in regular expression?

... Yes, you can. That should work. . = any char \. = the actual dot character .? = .{0,1} = match any char zero or one times .* = .{0,} = match any char zero or more times .+ = .{1,} = match any char one or more times ...
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How do I initialize a byte array in Java?

...; for (int i = 0; i < len; i += 2) { data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i+1), 16)); } return data; } If you let CDRIVES static and final, the performance drop is irrelevant. ...
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C++ convert hex string to signed integer

...iostream> using namespace std; int main() { string s = "abcd"; char * p; long n = strtol( s.c_str(), & p, 16 ); if ( * p != 0 ) { //my bad edit was here cout << "not a number" << endl; } else { cout << n << endl; } } ...
https://www.tsingfun.com/it/os_kernel/534.html 

Linux Glibc幽灵漏洞允许黑客远程获取系统权 - 操作系统(内核) - 清泛网 - ...

...de <string.h> #include <errno.h> #define CANARY"in_the_coal_mine" struct { char buffer[1024]; char canary[sizeof(CANARY)]; } temp = { "buffer", CANARY }; int main(void) { struct hostent resbuf; struct hostent *result; int herrno; int retval; /*** strlen (name) = size_needed -sizeof (*host_addr) - si...
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Why does the C preprocessor interpret the word “linux” as the constant “1”?

...LT_MIN__ 1.17549435082228750797e-38F #define __UINT_LEAST8_TYPE__ unsigned char #define __INTMAX_C(c) c ## L #define __CHAR_BIT__ 8 #define __UINT8_MAX__ 255 #define __WINT_MAX__ 2147483647 #define __ORDER_LITTLE_ENDIAN__ 1234 #define __SIZE_MAX__ 18446744073709551615UL #define __WCHAR_MAX__ 2147483...