#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 */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ error(char *);
int /*<<< orphan*/ strlcpy(char *, char *, int);
char *xmalloc(int);
void findchrconst(char **str, const char **val) {
  char *p;
  char *tmp;
  int size;
  p = *str;
  do {
    p++;
  } while (*p && *p != '\'');
  if (*p == 0) {
    error("unterminated string constant");
  }
  p++;
  size = p - *str + 1;
  if (size != 4) {
    error("empty char string");
  }
  tmp = xmalloc(size);
  (void)strlcpy(tmp, *str, size);
  *val = tmp;
  *str = p;
}


x86 assembly (clang, -O0):
<findchrconst>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rax
mov    (%rax),%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rax
movsbl (%rax),%ecx
xor    %eax,%eax
cmp    $0x0,%ecx
mov    %al,-0x25(%rbp)
je     117c <findchrconst+0x4c>
mov    -0x18(%rbp),%rax
movsbl (%rax),%eax
cmp    $0x27,%eax
setne  %al
mov    %al,-0x25(%rbp)
mov    -0x25(%rbp),%al
test   $0x1,%al
jne    114b <findchrconst+0x1b>
mov    -0x18(%rbp),%rax
movsbl (%rax),%eax
cmp    $0x0,%eax
jne    11a3 <findchrconst+0x73>
lea    0xe62(%rip),%rdi
call   1050 <error@plt>
mov    -0x18(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rax
mov    -0x8(%rbp),%rcx
mov    (%rcx),%rcx
sub    %rcx,%rax
add    $0x1,%rax
mov    %eax,-0x24(%rbp)
cmpl   $0x4,-0x24(%rbp)
je     11da <findchrconst+0xaa>
lea    0xe48(%rip),%rdi
call   1050 <error@plt>
mov    -0x24(%rbp),%edi
call   1030 <xmalloc@plt>
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rdi
mov    -0x8(%rbp),%rax
mov    (%rax),%rsi
mov    -0x24(%rbp),%edx
call   1040 <strlcpy@plt>
mov    -0x20(%rbp),%rcx
mov    -0x10(%rbp),%rax
mov    %rcx,(%rax)
mov    -0x18(%rbp),%rcx
mov    -0x8(%rbp),%rax
mov    %rcx,(%rax)
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<findchrconst>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
push   %rax
mov    %rsi,%r14
mov    %rdi,%r15
mov    (%rdi),%rax
lea    0x1(%rax),%rbx
mov    %eax,%ebp
neg    %ebp
nopl   0x0(%rax)
movzbl (%rbx),%ecx
add    $0x1,%rbx
add    $0xffffffff,%ebp
cmp    $0x27,%cl
je     1172 <findchrconst+0x42>
test   %cl,%cl
jne    1150 <findchrconst+0x20>
lea    0xe96(%rip),%rdi
call   1050 <error@plt>
mov    (%r15),%rax
mov    $0xfffffffe,%ecx
sub    %eax,%ecx
add    %ebp,%eax
mov    $0x2,%r13d
sub    %eax,%r13d
cmp    %ebp,%ecx
je     1194 <findchrconst+0x64>
lea    0xe8e(%rip),%rdi
call   1050 <error@plt>
mov    %r13d,%edi
call   1030 <xmalloc@plt>
mov    %rax,%r12
mov    (%r15),%rsi
mov    %rax,%rdi
mov    %r13d,%edx
call   1040 <strlcpy@plt>
mov    %r12,(%r14)
mov    %rbx,(%r15)
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [29 x i8] c"unterminated string constant\00"
@.str.1 = [18 x i8] c"empty char string\00"
define void @findchrconst(i8** %0, i8** %1) {
%3 = alloca i8**
%4 = alloca i8**
%5 = alloca i8*
%6 = alloca i8*
%7 = alloca i32
store i8** %0, i8*** %3
store i8** %1, i8*** %4
%8 = load i8**, i8*** %3
%9 = load i8*, i8** %8
store i8* %9, i8** %5
br label %10
10: ; preds = %23, %2
%11 = load i8*, i8** %5
%12 = getelementptr inbounds i8, i8* %11, i32 1
store i8* %12, i8** %5
br label %13
13: ; preds = %10
%14 = load i8*, i8** %5
%15 = load i8, i8* %14
%16 = sext i8 %15 to i32
%17 = icmp ne i32 %16, 0
br i1 %17, label %18, label %23
18: ; preds = %13
%19 = load i8*, i8** %5
%20 = load i8, i8* %19
%21 = sext i8 %20 to i32
%22 = icmp ne i32 %21, 39
br label %23
23: ; preds = %18, %13
%24 = phi i1 [ false, %13 ], [ %22, %18 ]
br i1 %24, label %10, label %25
25: ; preds = %23
%26 = load i8*, i8** %5
%27 = load i8, i8* %26
%28 = sext i8 %27 to i32
%29 = icmp eq i32 %28, 0
br i1 %29, label %30, label %32
30: ; preds = %25
%31 = call i32 @error(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str, i64 0, i64 0))
br label %32
32: ; preds = %30, %25
%33 = load i8*, i8** %5
%34 = getelementptr inbounds i8, i8* %33, i32 1
store i8* %34, i8** %5
%35 = load i8*, i8** %5
%36 = load i8**, i8*** %3
%37 = load i8*, i8** %36
%38 = ptrtoint i8* %35 to i64
%39 = ptrtoint i8* %37 to i64
%40 = sub i64 %38, %39
%41 = add nsw i64 %40, 1
%42 = trunc i64 %41 to i32
store i32 %42, i32* %7
%43 = load i32, i32* %7
%44 = icmp ne i32 %43, 4
br i1 %44, label %45, label %47
45: ; preds = %32
%46 = call i32 @error(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.1, i64 0, i64 0))
br label %47
47: ; preds = %45, %32
%48 = load i32, i32* %7
%49 = call i8* @xmalloc(i32 %48)
store i8* %49, i8** %6
%50 = load i8*, i8** %6
%51 = load i8**, i8*** %3
%52 = load i8*, i8** %51
%53 = load i32, i32* %7
%54 = call i32 @strlcpy(i8* %50, i8* %52, i32 %53)
%55 = load i8*, i8** %6
%56 = load i8**, i8*** %4
store i8* %55, i8** %56
%57 = load i8*, i8** %5
%58 = load i8**, i8*** %3
store i8* %57, i8** %58
ret void
}

LLVM IR (-O2):
@.str = [29 x i8] c"unterminated string constant\00"
@.str.1 = [18 x i8] c"empty char string\00"
define void @findchrconst(i8** nocapture %0, i8** nocapture writeonly %1) {
%3 = load i8*, i8** %0
br label %4
4: ; preds = %4, %2
%5 = phi i8* [ %3, %2 ], [ %6, %4 ]
%6 = getelementptr inbounds i8, i8* %5, i64 1
%7 = load i8, i8* %6
switch i8 %7, label %4 [
i8 0, label %8
i8 39, label %11
]
8: ; preds = %4
%9 = tail call i32 @error(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str, i64 0, i64 0))
%10 = load i8*, i8** %0
br label %11
11: ; preds = %4, %8
%12 = phi i8* [ %10, %8 ], [ %3, %4 ]
%13 = getelementptr inbounds i8, i8* %5, i64 2
%14 = ptrtoint i8* %13 to i64
%15 = ptrtoint i8* %12 to i64
%16 = sub i64 %14, %15
%17 = trunc i64 %16 to i32
%18 = add i32 %17, 1
%19 = icmp eq i32 %18, 4
br i1 %19, label %22, label %20
20: ; preds = %11
%21 = tail call i32 @error(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.1, i64 0, i64 0))
br label %22
22: ; preds = %20, %11
%23 = tail call i8* @xmalloc(i32 %18)
%24 = load i8*, i8** %0
%25 = tail call i32 @strlcpy(i8* %23, i8* %24, i32 %18)
store i8* %23, i8** %1
store i8* %13, i8** %0
ret void
}