#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */
typedef struct TYPE_2__ TYPE_1__;

/* Type definitions */
struct TYPE_2__ {
  int /*<<< orphan*/ s_addr;
};
struct sockaddr_in {
  int /*<<< orphan*/ sin_port;
  TYPE_1__ sin_addr;
  int /*<<< orphan*/ sin_family;
};
struct sockaddr {
  int dummy;
};
typedef int /*<<< orphan*/ serv_adr;
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int /*<<< orphan*/ ErrorHandling(char *);
int /*<<< orphan*/ PF_INET;
int /*<<< orphan*/ SOCK_STREAM;
int /*<<< orphan*/ atoi(char *);
int connect(int, struct sockaddr *, int);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fdopen(int, char *);
int /*<<< orphan*/ fflush(int /*<<< orphan*/ *);
int /*<<< orphan*/ fgets(char *, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fputs(char *, int /*<<< orphan*/ *);
int /*<<< orphan*/ htons(int /*<<< orphan*/);
int /*<<< orphan*/ inet_addr(char *);
int /*<<< orphan*/ memset(struct sockaddr_in *, int /*<<< orphan*/, int);
int /*<<< orphan*/ printf(char *, char *);
int /*<<< orphan*/ puts(char *);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int /*<<< orphan*/ *stdin;
int /*<<< orphan*/ *stdout;
int /*<<< orphan*/ strcmp(char *, char *);
int main(int argc, char *argv[]) {
  int sock;
  char message[1024];
  int str_len;
  struct sockaddr_in serv_adr;
  FILE *readfp;
  FILE *writefp;
  if (argc != 3) {
    printf("Usage: %s <IP><port>\n", argv[0]);
    exit(1);
  }
  sock = socket(PF_INET, SOCK_STREAM, 0);
  if (sock == -1)
    ErrorHandling("socket() error");
  memset(&serv_adr, 0, sizeof(serv_adr));
  serv_adr.sin_family = AF_INET;
  serv_adr.sin_addr.s_addr = inet_addr(argv[1]);
  serv_adr.sin_port = htons(atoi(argv[2]));
  if (connect(sock, (struct sockaddr *)&serv_adr, sizeof(serv_adr)) == -1)
    ErrorHandling("connect() error!");
  else
    puts("Conneected......");
  readfp = fdopen(sock, "r");
  writefp = fdopen(sock, "w");
  while (1) {
    fputs("Input message(Q to quit): ", stdout);
    fgets(message, 1024, stdin);
    if (!strcmp(message, "q\n") || !strcmp(message, "Q\n"))
      break;
    fputs(message, writefp);
    fflush(writefp);
    fgets(message, 1024, readfp);
    printf("Message from server : %s", message);
  }
  fclose(writefp);
  fclose(readfp);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x440,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x3,-0x8(%rbp)
je     1240 <main+0x40>
mov    -0x10(%rbp),%rax
mov    (%rax),%rsi
lea    0xdcf(%rip),%rdi
call   1060 <printf@plt>
mov    $0x1,%edi
call   1100 <exit@plt>
mov    0x2d81(%rip),%rax
mov    (%rax),%edi
mov    0x2d80(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1120 <socket@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0xffffffff,-0x14(%rbp)
jne    1272 <main+0x72>
lea    0xda9(%rip),%rdi
call   10f0 <ErrorHandling@plt>
lea    -0x430(%rbp),%rdi
xor    %esi,%esi
mov    $0xc,%edx
call   1080 <memset@plt>
mov    0x2d5c(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x428(%rbp)
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   10a0 <inet_addr@plt>
mov    %eax,-0x42c(%rbp)
mov    -0x10(%rbp),%rax
mov    0x10(%rax),%rdi
call   10e0 <atoi@plt>
mov    %eax,%edi
call   1050 <htons@plt>
mov    %eax,-0x430(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x430(%rbp),%rsi
mov    $0xc,%edx
call   1110 <connect@plt>
cmp    $0xffffffff,%eax
jne    12ef <main+0xef>
lea    0xd40(%rip),%rdi
call   10f0 <ErrorHandling@plt>
jmp    12fb <main+0xfb>
lea    0xd40(%rip),%rdi
call   1030 <puts@plt>
mov    -0x14(%rbp),%edi
lea    0xd1e(%rip),%rsi
call   10d0 <fdopen@plt>
mov    %rax,-0x438(%rbp)
mov    -0x14(%rbp),%edi
lea    0xd2c(%rip),%rsi
call   10d0 <fdopen@plt>
mov    %rax,-0x440(%rbp)
mov    0x2c92(%rip),%rax
mov    (%rax),%rsi
lea    0xd11(%rip),%rdi
call   1070 <fputs@plt>
lea    -0x420(%rbp),%rdi
mov    0x2c95(%rip),%rax
mov    (%rax),%rdx
mov    $0x400,%esi
call   1090 <fgets@plt>
lea    -0x420(%rbp),%rdi
lea    0xcfe(%rip),%rsi
call   10b0 <strcmp@plt>
cmp    $0x0,%eax
je     1390 <main+0x190>
lea    -0x420(%rbp),%rdi
lea    0xce5(%rip),%rsi
call   10b0 <strcmp@plt>
cmp    $0x0,%eax
jne    1395 <main+0x195>
jmp    13e4 <main+0x1e4>
lea    -0x420(%rbp),%rdi
mov    -0x440(%rbp),%rsi
call   1070 <fputs@plt>
mov    -0x440(%rbp),%rdi
call   10c0 <fflush@plt>
lea    -0x420(%rbp),%rdi
mov    -0x438(%rbp),%rdx
mov    $0x400,%esi
call   1090 <fgets@plt>
lea    -0x420(%rbp),%rsi
lea    0xc90(%rip),%rdi
call   1060 <printf@plt>
jmp    1327 <main+0x127>
mov    -0x440(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x438(%rbp),%rdi
call   1040 <fclose@plt>
xor    %eax,%eax
add    $0x440,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x418,%rsp
mov    %rsi,%rbx
cmp    $0x3,%edi
jne    13a0 <main+0x1a0>
mov    0x2da4(%rip),%rax
mov    (%rax),%edi
mov    0x2da3(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1120 <socket@plt>
mov    %eax,%ebp
cmp    $0xffffffff,%eax
jne    1249 <main+0x49>
lea    0xdd2(%rip),%rdi
call   10e0 <ErrorHandling@plt>
mov    %rsp,%r14
mov    %r14,%rdi
xor    %esi,%esi
mov    $0xc,%edx
call   1080 <memset@plt>
mov    0x2d86(%rip),%rax
mov    (%rax),%eax
mov    %eax,0x8(%rsp)
mov    0x8(%rbx),%rdi
call   10a0 <inet_addr@plt>
mov    %eax,0x4(%rsp)
mov    0x10(%rbx),%rdi
call   10d0 <atoi@plt>
mov    %eax,%edi
call   1050 <htons@plt>
mov    %eax,(%rsp)
mov    %ebp,%edi
mov    %r14,%rsi
mov    $0xc,%edx
call   1100 <connect@plt>
cmp    $0xffffffff,%eax
je     12aa <main+0xaa>
lea    0xd93(%rip),%rdi
call   1030 <puts@plt>
jmp    12b6 <main+0xb6>
lea    0xd74(%rip),%rdi
call   10e0 <ErrorHandling@plt>
lea    0xd66(%rip),%rsi
mov    %ebp,%edi
call   10c0 <fdopen@plt>
mov    %rax,%r15
lea    0xd79(%rip),%rsi
mov    %ebp,%edi
call   10c0 <fdopen@plt>
mov    %rax,%rbp
lea    0x10(%rsp),%rbx
mov    $0xa71,%r14d
mov    $0xa51,%r13d
lea    0xd7a(%rip),%r12
mov    0x2cc9(%rip),%rax
mov    (%rax),%rcx
mov    $0x1a,%esi
mov    $0x1,%edx
lea    0xd3e(%rip),%rdi
call   1110 <fwrite@plt>
mov    0x2cc9(%rip),%rax
mov    (%rax),%rdx
mov    %rbx,%rdi
mov    $0x400,%esi
call   1090 <fgets@plt>
mov    0x10(%rsp),%eax
xor    %r14d,%eax
movzbl 0x12(%rsp),%ecx
or     %ax,%cx
je     137c <main+0x17c>
mov    0x10(%rsp),%eax
xor    %r13d,%eax
movzbl 0x12(%rsp),%ecx
or     %ax,%cx
je     137c <main+0x17c>
mov    %rbx,%rdi
mov    %rbp,%rsi
call   1070 <fputs@plt>
mov    %rbp,%rdi
call   10b0 <fflush@plt>
mov    %rbx,%rdi
mov    $0x400,%esi
mov    %r15,%rdx
call   1090 <fgets@plt>
mov    %r12,%rdi
mov    %rbx,%rsi
call   1060 <printf@plt>
jmp    12f0 <main+0xf0>
mov    %rbp,%rdi
call   1040 <fclose@plt>
mov    %r15,%rdi
call   1040 <fclose@plt>
xor    %eax,%eax
add    $0x418,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret
mov    (%rbx),%rsi
lea    0xc56(%rip),%rdi
call   1060 <printf@plt>
mov    $0x1,%edi
call   10f0 <exit@plt>

LLVM IR (-O0):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.sockaddr = type { i32 }
@.str = [22 x i8] c"Usage: %s <IP><port>\0A\00"
@PF_INET = global i32 0
@SOCK_STREAM = global i32 0
@.str.1 = [15 x i8] c"socket() error\00"
@AF_INET = global i32 0
@.str.2 = [17 x i8] c"connect() error!\00"
@.str.3 = [17 x i8] c"Conneected......\00"
@.str.4 = [2 x i8] c"r\00"
@.str.5 = [2 x i8] c"w\00"
@.str.6 = [27 x i8] c"Input message(Q to quit): \00"
@stdout = global i32* null
@stdin = global i32* null
@.str.7 = [3 x i8] c"q\0A\00"
@.str.8 = [3 x i8] c"Q\0A\00"
@.str.9 = [25 x i8] c"Message from server : %s\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca [1024 x i8]
%8 = alloca i32
%9 = alloca %struct.sockaddr_in
%10 = alloca i32*
%11 = alloca i32*
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%12 = load i32, i32* %4
%13 = icmp ne i32 %12, 3
br i1 %13, label %14, label %20
14: ; preds = %2
%15 = load i8**, i8*** %5
%16 = getelementptr inbounds i8*, i8** %15, i64 0
%17 = load i8*, i8** %16
%18 = call i32 @printf(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0), i8* %17)
%19 = call i32 @exit(i32 1)
unreachable
20: ; preds = %2
%21 = load i32, i32* @PF_INET
%22 = load i32, i32* @SOCK_STREAM
%23 = call i32 @socket(i32 %21, i32 %22, i32 0)
store i32 %23, i32* %6
%24 = load i32, i32* %6
%25 = icmp eq i32 %24, -1
br i1 %25, label %26, label %28
26: ; preds = %20
%27 = call i32 @ErrorHandling(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0))
br label %28
28: ; preds = %26, %20
%29 = call i32 @memset(%struct.sockaddr_in* %9, i32 0, i32 12)
%30 = load i32, i32* @AF_INET
%31 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %9, i32 0, i32 2
store i32 %30, i32* %31
%32 = load i8**, i8*** %5
%33 = getelementptr inbounds i8*, i8** %32, i64 1
%34 = load i8*, i8** %33
%35 = call i32 @inet_addr(i8* %34)
%36 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %9, i32 0, i32 1
%37 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %36, i32 0, i32 0
store i32 %35, i32* %37
%38 = load i8**, i8*** %5
%39 = getelementptr inbounds i8*, i8** %38, i64 2
%40 = load i8*, i8** %39
%41 = call i32 @atoi(i8* %40)
%42 = call i32 @htons(i32 %41)
%43 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %9, i32 0, i32 0
store i32 %42, i32* %43
%44 = load i32, i32* %6
%45 = bitcast %struct.sockaddr_in* %9 to %struct.sockaddr*
%46 = call i32 @connect(i32 %44, %struct.sockaddr* %45, i32 12)
%47 = icmp eq i32 %46, -1
br i1 %47, label %48, label %50
48: ; preds = %28
%49 = call i32 @ErrorHandling(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0))
br label %52
50: ; preds = %28
%51 = call i32 @puts(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.3, i64 0, i64 0))
br label %52
52: ; preds = %50, %48
%53 = load i32, i32* %6
%54 = call i32* @fdopen(i32 %53, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0))
store i32* %54, i32** %10
%55 = load i32, i32* %6
%56 = call i32* @fdopen(i32 %55, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i64 0, i64 0))
store i32* %56, i32** %11
br label %57
57: ; preds = %52, %71
%58 = load i32*, i32** @stdout
%59 = call i32 @fputs(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.6, i64 0, i64 0), i32* %58)
%60 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 0
%61 = load i32*, i32** @stdin
%62 = call i32 @fgets(i8* %60, i32 1024, i32* %61)
%63 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 0
%64 = call i32 @strcmp(i8* %63, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.7, i64 0, i64 0))
%65 = icmp ne i32 %64, 0
br i1 %65, label %66, label %70
66: ; preds = %57
%67 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 0
%68 = call i32 @strcmp(i8* %67, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.8, i64 0, i64 0))
%69 = icmp ne i32 %68, 0
br i1 %69, label %71, label %70
70: ; preds = %66, %57
br label %82
71: ; preds = %66
%72 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 0
%73 = load i32*, i32** %11
%74 = call i32 @fputs(i8* %72, i32* %73)
%75 = load i32*, i32** %11
%76 = call i32 @fflush(i32* %75)
%77 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 0
%78 = load i32*, i32** %10
%79 = call i32 @fgets(i8* %77, i32 1024, i32* %78)
%80 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 0
%81 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.9, i64 0, i64 0), i8* %80)
br label %57
82: ; preds = %70
%83 = load i32*, i32** %11
%84 = call i32 @fclose(i32* %83)
%85 = load i32*, i32** %10
%86 = call i32 @fclose(i32* %85)
ret i32 0
}

LLVM IR (-O2):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.sockaddr = type { i32 }
@.str = [22 x i8] c"Usage: %s <IP><port>\0A\00"
@PF_INET = global i32 0
@SOCK_STREAM = global i32 0
@.str.1 = [15 x i8] c"socket() error\00"
@AF_INET = global i32 0
@.str.2 = [17 x i8] c"connect() error!\00"
@.str.3 = [17 x i8] c"Conneected......\00"
@.str.4 = [2 x i8] c"r\00"
@.str.5 = [2 x i8] c"w\00"
@.str.6 = [27 x i8] c"Input message(Q to quit): \00"
@stdout = global i32* null
@stdin = global i32* null
@.str.7 = [3 x i8] c"q\0A\00"
@.str.8 = [3 x i8] c"Q\0A\00"
@.str.9 = [25 x i8] c"Message from server : %s\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = alloca [1024 x i8]
%4 = alloca %struct.sockaddr_in
%5 = getelementptr inbounds [1024 x i8], [1024 x i8]* %3, i64 0, i64 0
%6 = bitcast %struct.sockaddr_in* %4 to i8*
%7 = icmp eq i32 %0, 3
br i1 %7, label %12, label %8
8: ; preds = %2
%9 = load i8*, i8** %1
%10 = tail call i32 @printf(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0), i8* %9)
%11 = tail call i32 @exit(i32 1)
unreachable
12: ; preds = %2
%13 = load i32, i32* @PF_INET
%14 = load i32, i32* @SOCK_STREAM
%15 = tail call i32 @socket(i32 %13, i32 %14, i32 0)
%16 = icmp eq i32 %15, -1
br i1 %16, label %17, label %19
17: ; preds = %12
%18 = tail call i32 @ErrorHandling(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0))
br label %19
19: ; preds = %17, %12
%20 = call i32 @memset(%struct.sockaddr_in* %4, i32 0, i32 12)
%21 = load i32, i32* @AF_INET
%22 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %4, i64 0, i32 2
store i32 %21, i32* %22
%23 = getelementptr inbounds i8*, i8** %1, i64 1
%24 = load i8*, i8** %23
%25 = call i32 @inet_addr(i8* %24)
%26 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %4, i64 0, i32 1, i32 0
store i32 %25, i32* %26
%27 = getelementptr inbounds i8*, i8** %1, i64 2
%28 = load i8*, i8** %27
%29 = call i32 @atoi(i8* %28)
%30 = call i32 @htons(i32 %29)
%31 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %4, i64 0, i32 0
store i32 %30, i32* %31
%32 = bitcast %struct.sockaddr_in* %4 to %struct.sockaddr*
%33 = call i32 @connect(i32 %15, %struct.sockaddr* %32, i32 12)
%34 = icmp eq i32 %33, -1
br i1 %34, label %35, label %37
35: ; preds = %19
%36 = call i32 @ErrorHandling(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0))
br label %39
37: ; preds = %19
%38 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str.3, i64 0, i64 0))
br label %39
39: ; preds = %37, %35
%40 = call i32* @fdopen(i32 %15, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0))
%41 = call i32* @fdopen(i32 %15, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i64 0, i64 0))
br label %42
42: ; preds = %52, %39
%43 = load i32*, i32** @stdout
%44 = call i64 @fwrite(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.6, i64 0, i64 0), i64 26, i64 1, i32* %43)
%45 = load i32*, i32** @stdin
%46 = call i32 @fgets(i8* %5, i32 1024, i32* %45)
%47 = call i32 @bcmp(i8* dereferenceable(3) %5, i8* dereferenceable(3) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.7, i64 0, i64 0), i64 3)
%48 = icmp eq i32 %47, 0
br i1 %48, label %57, label %49
49: ; preds = %42
%50 = call i32 @bcmp(i8* dereferenceable(3) %5, i8* dereferenceable(3) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.8, i64 0, i64 0), i64 3)
%51 = icmp eq i32 %50, 0
br i1 %51, label %57, label %52
52: ; preds = %49
%53 = call i32 @fputs(i8* %5, i32* %41)
%54 = call i32 @fflush(i32* %41)
%55 = call i32 @fgets(i8* %5, i32 1024, i32* %40)
%56 = call i32 @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.9, i64 0, i64 0), i8* %5)
br label %42
57: ; preds = %42, %49
%58 = call i32 @fclose(i32* %41)
%59 = call i32 @fclose(i32* %40)
ret i32 0
}