krzosa/practice_sockets
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refactor, bring back basic.h and Slice<T>

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This commit is contained in:
Krzosa Karol
2026-01-27 20:33:23 +01:00
parent 7dcc185c32
commit d1304b64d4
2 changed files with 70 additions and 94 deletions
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51
src/basic.cpp
View File

@@ -1,4 +1,8 @@
#define panicf(...) (fprintf(stderr, __VA_ARGS__), fprintf(stderr, "\n"), exit(1))
#define lengthof(x) (sizeof((x)) / sizeof((x)[0]))
#define panicf(...) (fprintf(stderr, "%s:%d: ", __FILE__, __LINE__), fprintf(stderr, __VA_ARGS__), fprintf(stderr, "\n"), exit(1))
#define debugf(...) (printf("%s:%d: ", __FILE__, __LINE__), printf(__VA_ARGS__), printf("\n"))
#define assert(x) ((!(x)) && (panicf("%s:%d: assertion failed " #x, __FILE__, __LINE__), 0))
template <typename T>
struct DEFER_ExitScope {
@@ -20,3 +24,48 @@ class DEFER_ExitScopeHelp {
#define DEFER_CONCAT_INTERNAL(x, y) x##y
#define DEFER_CONCAT(x, y) DEFER_CONCAT_INTERNAL(x, y)
#define defer const auto DEFER_CONCAT(defer__, __LINE__) = DEFER_ExitScopeHelp() + [&]()
char* strf(const char* format, ...) { // @leak
va_list args;
va_start(args, format);
va_list args_copy;
va_copy(args_copy, args);
int size = vsnprintf(NULL, 0, format, args_copy) + 1;
va_end(args_copy);
char* buffer = (char *)malloc(size);
assert(buffer);
vsnprintf(buffer, size, format, args);
va_end(args);
return buffer;
}
template<class T>
struct Slice {
T *data;
int len;
};
#define PLEN(x) {(x), lengthof(x)}
struct EnumValue {
int value;
const char *name;
};
#define ENUM_VALUE(x) {x, #x}
const char *serialize(Slice<EnumValue> table, int value) {
for (int i = 0; i < table.len; i += 1) {
EnumValue *it = table.data + i;
if (it->value == value) return it->name;
}
return "";
}
char *serialize_flags(Slice<EnumValue> table, int n) { // @leak
char *result = strf("%d", n);
for (int i = 0; i < table.len; i += 1) {
auto *it = table.data + i;
if (n & it->value) result = strf("%s %s", result, it->name);
}
return result;
}

113
src/main.cpp
View File

@@ -12,31 +12,7 @@
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib, "ws2_32")
#define panicf(...) (fprintf(stderr, "%s:%d: ", __FILE__, __LINE__), fprintf(stderr, __VA_ARGS__), fprintf(stderr, "\n"), exit(1))
#define debugf(...) (printf("%s:%d: ", __FILE__, __LINE__), printf(__VA_ARGS__), printf("\n"))
#define assert(x) ((!(x)) && (panicf("%s:%d: assertion failed " #x, __FILE__, __LINE__), 0))
template <typename T>
struct DEFER_ExitScope {
T lambda;
DEFER_ExitScope(T lambda) : lambda(lambda) {}
~DEFER_ExitScope() { lambda(); }
DEFER_ExitScope(const DEFER_ExitScope &i) : lambda(i.lambda){};
private:
DEFER_ExitScope &operator=(const DEFER_ExitScope &);
};
class DEFER_ExitScopeHelp {
public:
template <typename T>
DEFER_ExitScope<T> operator+(T t) { return t; }
};
#define DEFER_CONCAT_INTERNAL(x, y) x##y
#define DEFER_CONCAT(x, y) DEFER_CONCAT_INTERNAL(x, y)
#define defer const auto DEFER_CONCAT(defer__, __LINE__) = DEFER_ExitScopeHelp() + [&]()
#include "basic.cpp"
char *serialize_error_code(DWORD errorCode) {
char* message = NULL;
@@ -58,98 +34,49 @@ char *serialize_error_code(DWORD errorCode) {
if (newline) *newline = '\0';
}
return message; // Remember to LocalFree() this later!
return message; // @leak - LocalFree
}
char* strf(const char* format, ...) {
va_list args;
va_start(args, format);
va_list args_copy;
va_copy(args_copy, args);
int size = vsnprintf(NULL, 0, format, args_copy) + 1;
va_end(args_copy);
char* buffer = (char *)malloc(size);
assert(buffer);
vsnprintf(buffer, size, format, args);
va_end(args);
return buffer;
}
#define lengthof(x) (sizeof((x)) / sizeof((x)[0]))
struct EnumValue {
int value;
const char *name;
};
#define ENUM_VALUE(x) {x, #x}
const char *serialize(EnumValue *table, int table_size, int value) {
for (int i = 0; i < table_size; i += 1) {
EnumValue *it = table + i;
if (it->value == value) return it->name;
}
return "";
}
EnumValue ai_flag_table[] = {
EnumValue _ai_flags_table[] = {
ENUM_VALUE(AI_PASSIVE),
ENUM_VALUE(AI_CANONNAME),
ENUM_VALUE(AI_NUMERICHOST),
};
Slice<EnumValue> ai_flags_table = PLEN(_ai_flags_table);
char *serialize_ai_flags(int n) {
char *result = strf("%d", n);
for (int i = 0; i < lengthof(ai_flag_table); i += 1) {
auto *it = ai_flag_table + i;
if (n & it->value) result = strf("%s %s", result, it->name);
}
return result;
}
struct {
const char *name;
int value;
const char *desc;
} ai_family_table[] = {
{"AF_UNSPEC", 0, "The address family is unspecified"},
{"AF_INET", 2, "The Internet Protocol version 4 (IPv4) address family."},
{"AF_NETBIOS", 17, "The NetBIOS address family. This address family is only supported if a Windows Sockets provider for NetBIOS is installed."},
{"AF_INET6", 23, "The Internet Protocol version 6 (IPv6) address family."},
{"AF_IRDA", 26, "The Infrared Data Association (IrDA) address family. This address family is only supported if the computer has an infrared port and driver installed."},
{"AF_BTH", 32, "The Bluetooth address family. This address family is only supported if a Bluetooth adapter is installed on Windows Server 2003 or later."},
EnumValue _ai_family_table[] = {
{0, "AF_UNSPEC"},
{2, "AF_INET"},
{17, "AF_NETBIOS"},
{23, "AF_INET6"},
{26, "AF_IRDA"},
{32, "AF_BTH"},
};
Slice<EnumValue> ai_family_table = PLEN(_ai_family_table);
const char *serialize_ai_family(int n) {
for (int i = 0; i < lengthof(ai_family_table); i += 1) {
auto *it = ai_family_table + i;
if (it->value == n) {
return it->name;
}
}
return "";
}
EnumValue ai_socktype_table[] = {
EnumValue _ai_socktype_table[] = {
ENUM_VALUE(SOCK_STREAM),
ENUM_VALUE(SOCK_DGRAM),
ENUM_VALUE(SOCK_RAW),
ENUM_VALUE(SOCK_RDM),
ENUM_VALUE(SOCK_SEQPACKET),
};
Slice<EnumValue> ai_socktype_table = PLEN(_ai_socktype_table);
EnumValue ai_protocol_table[] = {
EnumValue _ai_protocol_table[] = {
ENUM_VALUE(IPPROTO_TCP),
ENUM_VALUE(IPPROTO_UDP),
ENUM_VALUE(IPPROTO_PGM),
};
Slice<EnumValue> ai_protocol_table = PLEN(_ai_protocol_table);
void serialize_addrinfo(struct addrinfo* in) {
for (struct addrinfo* p = in; p != NULL; p = p->ai_next) {
printf("addrinfo %p {\n", p);
printf(" ai_flags = %s(%d)\n", serialize_ai_flags(p->ai_flags), p->ai_flags);
printf(" ai_family = %s(%d)\n", serialize_ai_family(p->ai_family), p->ai_family);
printf(" ai_socktype = %s(%d)\n", serialize(ai_socktype_table, lengthof(ai_socktype_table), p->ai_socktype), p->ai_socktype);
printf(" ai_protocol = %s(%d)\n", serialize(ai_protocol_table, lengthof(ai_protocol_table), p->ai_protocol), p->ai_protocol);
printf(" ai_flags = %s(%d)\n", serialize_flags(ai_flags_table, p->ai_flags), p->ai_flags);
printf(" ai_family = %s(%d)\n", serialize(ai_family_table, p->ai_family), p->ai_family);
printf(" ai_socktype = %s(%d)\n", serialize(ai_socktype_table, p->ai_socktype), p->ai_socktype);
printf(" ai_protocol = %s(%d)\n", serialize(ai_protocol_table, p->ai_protocol), p->ai_protocol);
printf(" ai_addrlen = %zu\n", p->ai_addrlen);
printf(" ai_canonname = \"%s\"\n", p->ai_canonname ? p->ai_canonname : "");