#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;
};
struct hostent {
  int /*<<< orphan*/ h_length;
  scalar_t__ h_addr;
};
typedef int /*<<< orphan*/ serv_addr;

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int /*<<< orphan*/ SOCK_STREAM;
int atoi(char *);
int /*<<< orphan*/ bcopy(char *, char *, int /*<<< orphan*/);
int /*<<< orphan*/ bzero(char *, int);
scalar_t__ connect(int, struct sockaddr *, int);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fgets(char *, int, int /*<<< orphan*/);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, ...);
struct hostent *gethostbyname(char *);
int /*<<< orphan*/ htons(int);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ printf(char *, ...);
int read(int, char *, int);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int /*<<< orphan*/ stderr;
int /*<<< orphan*/ stdin;
int /*<<< orphan*/ strlen(char *);
int write(int, char *, int /*<<< orphan*/);
int main(int argc, char *argv[]) {
  int sockfd, portno, n;
  struct sockaddr_in serv_addr;
  struct hostent *server;
  char buffer[256];
  if (argc < 3) {
    fprintf(stderr, "usage %s hostname port\n", argv[0]);
    exit(0);
  }
  portno = atoi(argv[2]);
  sockfd = socket(AF_INET, SOCK_STREAM, 0);
  if (sockfd < 0) {
    perror("ERROR opening socket");
    exit(1);
  }
  server = gethostbyname(argv[1]);
  if (server == NULL) {
    fprintf(stderr, "ERROR, no such host\n");
    exit(0);
  }
  bzero((char *)&serv_addr, sizeof(serv_addr));
  serv_addr.sin_family = AF_INET;
  bcopy((char *)server->h_addr, (char *)&serv_addr.sin_addr.s_addr,
        server->h_length);
  serv_addr.sin_port = htons(portno);
  if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
    perror("ERROR connecting");
    exit(1);
  }
  printf("Please enter the message: ");
  bzero(buffer, 256);
  fgets(buffer, 255, stdin);
  n = write(sockfd, buffer, strlen(buffer));
  if (n < 0) {
    perror("ERROR writing to socket");
    exit(1);
  }
  bzero(buffer, 256);
  n = read(sockfd, buffer, 255);
  if (n < 0) {
    perror("ERROR reading from socket");
    exit(1);
  }
  printf("%s\n", buffer);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x140,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x3,-0x8(%rbp)
jge    1238 <main+0x48>
mov    0x2db6(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xdd6(%rip),%rsi
mov    $0x0,%al
call   10a0 <fprintf@plt>
xor    %edi,%edi
call   10f0 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x10(%rax),%rdi
call   10e0 <atoi@plt>
mov    %eax,-0x18(%rbp)
mov    0x2d99(%rip),%rax
mov    (%rax),%edi
mov    0x2d70(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1110 <socket@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    1284 <main+0x94>
lea    0xda3(%rip),%rdi
call   10c0 <perror@plt>
mov    $0x1,%edi
call   10f0 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1090 <gethostbyname@plt>
mov    %rax,-0x30(%rbp)
cmpq   $0x0,-0x30(%rbp)
jne    12be <main+0xce>
mov    0x2d29(%rip),%rax
mov    (%rax),%edi
lea    0xd7d(%rip),%rsi
mov    $0x0,%al
call   10a0 <fprintf@plt>
xor    %edi,%edi
call   10f0 <exit@plt>
lea    -0x28(%rbp),%rdi
mov    $0xc,%esi
call   10d0 <bzero@plt>
mov    0x2d15(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x20(%rbp)
mov    -0x30(%rbp),%rax
mov    0x8(%rax),%rdi
lea    -0x28(%rbp),%rsi
add    $0x4,%rsi
mov    -0x30(%rbp),%rax
mov    (%rax),%edx
call   10b0 <bcopy@plt>
mov    -0x18(%rbp),%edi
call   1050 <htons@plt>
mov    %eax,-0x28(%rbp)
mov    -0x14(%rbp),%edi
lea    -0x28(%rbp),%rsi
mov    $0xc,%edx
call   1100 <connect@plt>
cmp    $0x0,%rax
jge    132f <main+0x13f>
lea    0xd22(%rip),%rdi
call   10c0 <perror@plt>
mov    $0x1,%edi
call   10f0 <exit@plt>
lea    0xd1d(%rip),%rdi
mov    $0x0,%al
call   1060 <printf@plt>
lea    -0x130(%rbp),%rdi
mov    $0x100,%esi
call   10d0 <bzero@plt>
lea    -0x130(%rbp),%rdi
mov    0x2c84(%rip),%rax
mov    (%rax),%edx
mov    $0xff,%esi
call   1080 <fgets@plt>
mov    -0x14(%rbp),%eax
mov    %eax,-0x13c(%rbp)
lea    -0x130(%rbp),%rax
mov    %rax,-0x138(%rbp)
lea    -0x130(%rbp),%rdi
call   1040 <strlen@plt>
mov    -0x13c(%rbp),%edi
mov    -0x138(%rbp),%rsi
mov    %eax,%edx
call   1030 <write@plt>
mov    %eax,-0x1c(%rbp)
cmpl   $0x0,-0x1c(%rbp)
jge    13c2 <main+0x1d2>
lea    0xcbb(%rip),%rdi
call   10c0 <perror@plt>
mov    $0x1,%edi
call   10f0 <exit@plt>
lea    -0x130(%rbp),%rdi
mov    $0x100,%esi
call   10d0 <bzero@plt>
mov    -0x14(%rbp),%edi
lea    -0x130(%rbp),%rsi
mov    $0xff,%edx
call   1070 <read@plt>
mov    %eax,-0x1c(%rbp)
cmpl   $0x0,-0x1c(%rbp)
jge    140a <main+0x21a>
lea    0xc8b(%rip),%rdi
call   10c0 <perror@plt>
mov    $0x1,%edi
call   10f0 <exit@plt>
lea    -0x130(%rbp),%rsi
lea    0xc88(%rip),%rdi
mov    $0x0,%al
call   1060 <printf@plt>
xor    %eax,%eax
add    $0x140,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
sub    $0x110,%rsp
mov    %rsi,%rbp
cmp    $0x2,%edi
jle    1340 <main+0x140>
mov    0x10(%rbp),%rdi
call   10f0 <atoi@plt>
mov    %eax,%r14d
mov    0x2dba(%rip),%r12
mov    (%r12),%edi
mov    0x2d8f(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1120 <socket@plt>
test   %eax,%eax
js     1362 <main+0x162>
mov    %eax,%ebx
mov    0x8(%rbp),%rdi
call   10a0 <gethostbyname@plt>
test   %rax,%rax
je     136b <main+0x16b>
mov    %rax,%rbp
mov    %rsp,%r15
mov    %r15,%rdi
mov    $0xc,%esi
call   10e0 <bzero@plt>
mov    (%r12),%eax
mov    %eax,0x8(%rsp)
mov    0x8(%rbp),%rsi
lea    0x4(%rsp),%rdi
mov    0x0(%rbp),%edx
call   10c0 <memmove@plt>
mov    %r14d,%edi
call   1060 <htons@plt>
mov    %eax,(%rsp)
mov    %ebx,%edi
mov    %r15,%rsi
mov    $0xc,%edx
call   1110 <connect@plt>
test   %rax,%rax
js     1389 <main+0x189>
lea    0xd9f(%rip),%rdi
xor    %eax,%eax
call   1070 <printf@plt>
lea    0x10(%rsp),%rbp
mov    %rbp,%rdi
mov    $0x100,%esi
call   10e0 <bzero@plt>
mov    0x2d0c(%rip),%rax
mov    (%rax),%edx
mov    %rbp,%rdi
mov    $0xff,%esi
call   1090 <fgets@plt>
mov    %rbp,%rdi
call   1050 <strlen@plt>
mov    %ebx,%edi
mov    %rbp,%rsi
mov    %eax,%edx
call   1040 <write@plt>
test   %eax,%eax
js     1392 <main+0x192>
lea    0x10(%rsp),%rbp
mov    %rbp,%rdi
mov    $0x100,%esi
call   10e0 <bzero@plt>
mov    %ebx,%edi
mov    %rbp,%rsi
mov    $0xff,%edx
call   1080 <read@plt>
test   %eax,%eax
js     139b <main+0x19b>
lea    0x10(%rsp),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x110,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret
mov    0x2c89(%rip),%rax
mov    (%rax),%edi
mov    0x0(%rbp),%rdx
lea    0xcac(%rip),%rsi
xor    %eax,%eax
call   10b0 <fprintf@plt>
xor    %edi,%edi
call   1100 <exit@plt>
lea    0xcaf(%rip),%rdi
jmp    13a2 <main+0x1a2>
mov    0x2c5e(%rip),%rax
mov    (%rax),%edi
lea    0xcb2(%rip),%rsi
xor    %eax,%eax
call   10b0 <fprintf@plt>
xor    %edi,%edi
call   1100 <exit@plt>
lea    0xcb2(%rip),%rdi
jmp    13a2 <main+0x1a2>
lea    0xcd5(%rip),%rdi
jmp    13a2 <main+0x1a2>
lea    0xce4(%rip),%rdi
call   10d0 <perror@plt>
mov    $0x1,%edi
call   1100 <exit@plt>

LLVM IR (-O0):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.hostent = type { i32, i64 }
%struct.sockaddr = type { i32 }
@stderr = global i32 0
@.str = [24 x i8] c"usage %s hostname port\0A\00"
@AF_INET = global i32 0
@SOCK_STREAM = global i32 0
@.str.1 = [21 x i8] c"ERROR opening socket\00"
@.str.2 = [21 x i8] c"ERROR, no such host\0A\00"
@.str.3 = [17 x i8] c"ERROR connecting\00"
@.str.4 = [27 x i8] c"Please enter the message: \00"
@stdin = global i32 0
@.str.5 = [24 x i8] c"ERROR writing to socket\00"
@.str.6 = [26 x i8] c"ERROR reading from socket\00"
@.str.7 = [4 x i8] c"%s\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
%8 = alloca i32
%9 = alloca %struct.sockaddr_in
%10 = alloca %struct.hostent*
%11 = alloca [256 x i8]
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%12 = load i32, i32* %4
%13 = icmp slt i32 %12, 3
br i1 %13, label %14, label %21
14: ; preds = %2
%15 = load i32, i32* @stderr
%16 = load i8**, i8*** %5
%17 = getelementptr inbounds i8*, i8** %16, i64 0
%18 = load i8*, i8** %17
%19 = call i32 (i32, i8*, ...) @fprintf(i32 %15, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str, i64 0, i64 0), i8* %18)
%20 = call i32 @exit(i32 0)
unreachable
21: ; preds = %2
%22 = load i8**, i8*** %5
%23 = getelementptr inbounds i8*, i8** %22, i64 2
%24 = load i8*, i8** %23
%25 = call i32 @atoi(i8* %24)
store i32 %25, i32* %7
%26 = load i32, i32* @AF_INET
%27 = load i32, i32* @SOCK_STREAM
%28 = call i32 @socket(i32 %26, i32 %27, i32 0)
store i32 %28, i32* %6
%29 = load i32, i32* %6
%30 = icmp slt i32 %29, 0
br i1 %30, label %31, label %34
31: ; preds = %21
%32 = call i32 @perror(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0))
%33 = call i32 @exit(i32 1)
unreachable
34: ; preds = %21
%35 = load i8**, i8*** %5
%36 = getelementptr inbounds i8*, i8** %35, i64 1
%37 = load i8*, i8** %36
%38 = call %struct.hostent* @gethostbyname(i8* %37)
store %struct.hostent* %38, %struct.hostent** %10
%39 = load %struct.hostent*, %struct.hostent** %10
%40 = icmp eq %struct.hostent* %39, null
br i1 %40, label %41, label %45
41: ; preds = %34
%42 = load i32, i32* @stderr
%43 = call i32 (i32, i8*, ...) @fprintf(i32 %42, i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.2, i64 0, i64 0))
%44 = call i32 @exit(i32 0)
unreachable
45: ; preds = %34
%46 = bitcast %struct.sockaddr_in* %9 to i8*
%47 = call i32 @bzero(i8* %46, i32 12)
%48 = load i32, i32* @AF_INET
%49 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %9, i32 0, i32 2
store i32 %48, i32* %49
%50 = load %struct.hostent*, %struct.hostent** %10
%51 = getelementptr inbounds %struct.hostent, %struct.hostent* %50, i32 0, i32 1
%52 = load i64, i64* %51
%53 = inttoptr i64 %52 to i8*
%54 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %9, i32 0, i32 1
%55 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %54, i32 0, i32 0
%56 = bitcast i32* %55 to i8*
%57 = load %struct.hostent*, %struct.hostent** %10
%58 = getelementptr inbounds %struct.hostent, %struct.hostent* %57, i32 0, i32 0
%59 = load i32, i32* %58
%60 = call i32 @bcopy(i8* %53, i8* %56, i32 %59)
%61 = load i32, i32* %7
%62 = call i32 @htons(i32 %61)
%63 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %9, i32 0, i32 0
store i32 %62, i32* %63
%64 = load i32, i32* %6
%65 = bitcast %struct.sockaddr_in* %9 to %struct.sockaddr*
%66 = call i64 @connect(i32 %64, %struct.sockaddr* %65, i32 12)
%67 = icmp slt i64 %66, 0
br i1 %67, label %68, label %71
68: ; preds = %45
%69 = call i32 @perror(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.3, i64 0, i64 0))
%70 = call i32 @exit(i32 1)
unreachable
71: ; preds = %45
%72 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.4, i64 0, i64 0))
%73 = getelementptr inbounds [256 x i8], [256 x i8]* %11, i64 0, i64 0
%74 = call i32 @bzero(i8* %73, i32 256)
%75 = getelementptr inbounds [256 x i8], [256 x i8]* %11, i64 0, i64 0
%76 = load i32, i32* @stdin
%77 = call i32 @fgets(i8* %75, i32 255, i32 %76)
%78 = load i32, i32* %6
%79 = getelementptr inbounds [256 x i8], [256 x i8]* %11, i64 0, i64 0
%80 = getelementptr inbounds [256 x i8], [256 x i8]* %11, i64 0, i64 0
%81 = call i32 @strlen(i8* %80)
%82 = call i32 @write(i32 %78, i8* %79, i32 %81)
store i32 %82, i32* %8
%83 = load i32, i32* %8
%84 = icmp slt i32 %83, 0
br i1 %84, label %85, label %88
85: ; preds = %71
%86 = call i32 @perror(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.5, i64 0, i64 0))
%87 = call i32 @exit(i32 1)
unreachable
88: ; preds = %71
%89 = getelementptr inbounds [256 x i8], [256 x i8]* %11, i64 0, i64 0
%90 = call i32 @bzero(i8* %89, i32 256)
%91 = load i32, i32* %6
%92 = getelementptr inbounds [256 x i8], [256 x i8]* %11, i64 0, i64 0
%93 = call i32 @read(i32 %91, i8* %92, i32 255)
store i32 %93, i32* %8
%94 = load i32, i32* %8
%95 = icmp slt i32 %94, 0
br i1 %95, label %96, label %99
96: ; preds = %88
%97 = call i32 @perror(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.6, i64 0, i64 0))
%98 = call i32 @exit(i32 1)
unreachable
99: ; preds = %88
%100 = getelementptr inbounds [256 x i8], [256 x i8]* %11, i64 0, i64 0
%101 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.7, i64 0, i64 0), i8* %100)
ret i32 0
}

LLVM IR (-O2):
%struct.sockaddr_in = type { i32, %struct.TYPE_2__, i32 }
%struct.TYPE_2__ = type { i32 }
%struct.hostent = type { i32, i64 }
%struct.sockaddr = type { i32 }
@stderr = global i32 0
@.str = [24 x i8] c"usage %s hostname port\0A\00"
@AF_INET = global i32 0
@SOCK_STREAM = global i32 0
@.str.1 = [21 x i8] c"ERROR opening socket\00"
@.str.2 = [21 x i8] c"ERROR, no such host\0A\00"
@.str.3 = [17 x i8] c"ERROR connecting\00"
@.str.4 = [27 x i8] c"Please enter the message: \00"
@stdin = global i32 0
@.str.5 = [24 x i8] c"ERROR writing to socket\00"
@.str.6 = [26 x i8] c"ERROR reading from socket\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = alloca %struct.sockaddr_in
%4 = alloca [256 x i8]
%5 = bitcast %struct.sockaddr_in* %3 to i8*
%6 = getelementptr inbounds [256 x i8], [256 x i8]* %4, i64 0, i64 0
%7 = icmp slt i32 %0, 3
br i1 %7, label %8, label %13
8: ; preds = %2
%9 = load i32, i32* @stderr
%10 = load i8*, i8** %1
%11 = tail call i32 (i32, i8*, ...) @fprintf(i32 %9, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str, i64 0, i64 0), i8* %10)
%12 = tail call i32 @exit(i32 0)
unreachable
13: ; preds = %2
%14 = getelementptr inbounds i8*, i8** %1, i64 2
%15 = load i8*, i8** %14
%16 = tail call i32 @atoi(i8* %15)
%17 = load i32, i32* @AF_INET
%18 = load i32, i32* @SOCK_STREAM
%19 = tail call i32 @socket(i32 %17, i32 %18, i32 0)
%20 = icmp slt i32 %19, 0
br i1 %20, label %21, label %24
21: ; preds = %13
%22 = tail call i32 @perror(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0))
%23 = tail call i32 @exit(i32 1)
unreachable
24: ; preds = %13
%25 = getelementptr inbounds i8*, i8** %1, i64 1
%26 = load i8*, i8** %25
%27 = tail call %struct.hostent* @gethostbyname(i8* %26)
%28 = icmp eq %struct.hostent* %27, null
br i1 %28, label %29, label %33
29: ; preds = %24
%30 = load i32, i32* @stderr
%31 = tail call i32 (i32, i8*, ...) @fprintf(i32 %30, i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.2, i64 0, i64 0))
%32 = tail call i32 @exit(i32 0)
unreachable
33: ; preds = %24
%34 = call i32 @bzero(i8* %5, i32 12)
%35 = load i32, i32* @AF_INET
%36 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 2
store i32 %35, i32* %36
%37 = getelementptr inbounds %struct.hostent, %struct.hostent* %27, i64 0, i32 1
%38 = load i64, i64* %37
%39 = inttoptr i64 %38 to i8*
%40 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 1, i32 0
%41 = bitcast i32* %40 to i8*
%42 = getelementptr inbounds %struct.hostent, %struct.hostent* %27, i64 0, i32 0
%43 = load i32, i32* %42
%44 = tail call i32 @htons(i32 %16)
%45 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 0
store i32 %44, i32* %45
%46 = bitcast %struct.sockaddr_in* %3 to %struct.sockaddr*
%47 = call i64 @connect(i32 %19, %struct.sockaddr* %46, i32 12)
%48 = icmp slt i64 %47, 0
br i1 %48, label %49, label %52
49: ; preds = %33
%50 = call i32 @perror(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.3, i64 0, i64 0))
%51 = call i32 @exit(i32 1)
unreachable
52: ; preds = %33
%53 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @.str.4, i64 0, i64 0))
%54 = call i32 @bzero(i8* %6, i32 256)
%55 = load i32, i32* @stdin
%56 = call i32 @fgets(i8* %6, i32 255, i32 %55)
%57 = call i32 @strlen(i8* %6)
%58 = call i32 @write(i32 %19, i8* %6, i32 %57)
%59 = icmp slt i32 %58, 0
br i1 %59, label %60, label %63
60: ; preds = %52
%61 = call i32 @perror(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.5, i64 0, i64 0))
%62 = call i32 @exit(i32 1)
unreachable
63: ; preds = %52
%64 = call i32 @bzero(i8* %6, i32 256)
%65 = call i32 @read(i32 %19, i8* %6, i32 255)
%66 = icmp slt i32 %65, 0
br i1 %66, label %67, label %70
67: ; preds = %63
%68 = call i32 @perror(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.6, i64 0, i64 0))
%69 = call i32 @exit(i32 1)
unreachable
70: ; preds = %63
%71 = call i32 @puts(i8* %6)
ret i32 0
}