c - isprint ('\t' ) 使用/MD 编译器选项计算为真 (64)-6ren

c - isprint ('\t' ) 使用/MD 编译器选项计算为真 (64)

转载作者：太空狗更新时间：2023-10-29 15:25:29

我对 isprint 有意外的结果Visual Studio 2017下的函数。给定以下程序

#include <ctype.h>
#include <stdio.h>

int main() {
  for (int i = 0; i < 128; i += 1) {
    printf("isprint(0x%x aka '%c') = %s (%d)\n", i, (char)i,
           isprint((char)i) ? "yes" : "no", isprint((char)i));
  }
  return 0;
}

使用

编译执行

cl /MD isprint.c /Feisprint.exe && isprint.exe

Microsoft (R) C/C++ Optimizing Compiler Version 19.14.26433 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

isprint.c
Microsoft (R) Incremental Linker Version 14.14.26433.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:isprint.exe
isprint.obj
isprint(0x0 aka ' ') = no (0)
isprint(0x1 aka '') = no (0)
isprint(0x2 aka '') = no (0)
isprint(0x3 aka '') = no (0)
isprint(0x4 aka '') = no (0)
isprint(0x5 aka '') = no (0)
isprint(0x6 aka '') = no (0)
isprint(0x7 aka '') = no (0)
isprint(0x8 aka ') = no (0)
isprint(0x9 aka '       ') = yes (64)
isprint(0xa aka '
') = no (0)
isprint(0xb aka '') = no (0)
isprint(0xc aka '') = no (0)
') = no (0) aka '
isprint(0xe aka '') = no (0)
isprint(0xf aka '') = no (0)
isprint(0x10 aka '') = no (0)
isprint(0x11 aka '') = no (0)
isprint(0x12 aka '') = no (0)
isprint(0x13 aka '') = no (0)
isprint(0x14 aka '') = no (0)
isprint(0x15 aka '') = no (0)
isprint(0x16 aka '') = no (0)
isprint(0x17 aka '') = no (0)
isprint(0x18 aka '') = no (0)
isprint(0x19 aka '') = no (0)
isprint(0x1a aka '') = no (0)
isprint(0x1b aka '') = no (0)
isprint(0x1c aka '') = no (0)
isprint(0x1d aka '') = no (0)
isprint(0x1e aka '') = no (0)
isprint(0x1f aka '') = no (0)
isprint(0x20 aka ' ') = yes (64)
isprint(0x21 aka '!') = yes (16)
isprint(0x22 aka '"') = yes (16)
isprint(0x23 aka '#') = yes (16)
isprint(0x24 aka '$') = yes (16)
isprint(0x25 aka '%') = yes (16)
isprint(0x26 aka '&') = yes (16)
isprint(0x27 aka ''') = yes (16)
isprint(0x28 aka '(') = yes (16)
isprint(0x29 aka ')') = yes (16)
isprint(0x2a aka '*') = yes (16)
isprint(0x2b aka '+') = yes (16)
isprint(0x2c aka ',') = yes (16)
isprint(0x2d aka '-') = yes (16)
isprint(0x2e aka '.') = yes (16)
isprint(0x2f aka '/') = yes (16)
isprint(0x30 aka '0') = yes (4)
isprint(0x31 aka '1') = yes (4)
isprint(0x32 aka '2') = yes (4)
isprint(0x33 aka '3') = yes (4)
isprint(0x34 aka '4') = yes (4)
isprint(0x35 aka '5') = yes (4)
isprint(0x36 aka '6') = yes (4)
isprint(0x37 aka '7') = yes (4)
isprint(0x38 aka '8') = yes (4)
isprint(0x39 aka '9') = yes (4)
isprint(0x3a aka ':') = yes (16)
isprint(0x3b aka ';') = yes (16)
isprint(0x3c aka '<') = yes (16)
isprint(0x3d aka '=') = yes (16)
isprint(0x3e aka '>') = yes (16)
isprint(0x3f aka '?') = yes (16)
isprint(0x40 aka '@') = yes (16)
isprint(0x41 aka 'A') = yes (1)
isprint(0x42 aka 'B') = yes (1)
isprint(0x43 aka 'C') = yes (1)
isprint(0x44 aka 'D') = yes (1)
isprint(0x45 aka 'E') = yes (1)
isprint(0x46 aka 'F') = yes (1)
isprint(0x47 aka 'G') = yes (1)
isprint(0x48 aka 'H') = yes (1)
isprint(0x49 aka 'I') = yes (1)
isprint(0x4a aka 'J') = yes (1)
isprint(0x4b aka 'K') = yes (1)
isprint(0x4c aka 'L') = yes (1)
isprint(0x4d aka 'M') = yes (1)
isprint(0x4e aka 'N') = yes (1)
isprint(0x4f aka 'O') = yes (1)
isprint(0x50 aka 'P') = yes (1)
isprint(0x51 aka 'Q') = yes (1)
isprint(0x52 aka 'R') = yes (1)
isprint(0x53 aka 'S') = yes (1)
isprint(0x54 aka 'T') = yes (1)
isprint(0x55 aka 'U') = yes (1)
isprint(0x56 aka 'V') = yes (1)
isprint(0x57 aka 'W') = yes (1)
isprint(0x58 aka 'X') = yes (1)
isprint(0x59 aka 'Y') = yes (1)
isprint(0x5a aka 'Z') = yes (1)
isprint(0x5b aka '[') = yes (16)
isprint(0x5c aka '\') = yes (16)
isprint(0x5d aka ']') = yes (16)
isprint(0x5e aka '^') = yes (16)
isprint(0x5f aka '_') = yes (16)
isprint(0x60 aka '`') = yes (16)
isprint(0x61 aka 'a') = yes (2)
isprint(0x62 aka 'b') = yes (2)
isprint(0x63 aka 'c') = yes (2)
isprint(0x64 aka 'd') = yes (2)
isprint(0x65 aka 'e') = yes (2)
isprint(0x66 aka 'f') = yes (2)
isprint(0x67 aka 'g') = yes (2)
isprint(0x68 aka 'h') = yes (2)
isprint(0x69 aka 'i') = yes (2)
isprint(0x6a aka 'j') = yes (2)
isprint(0x6b aka 'k') = yes (2)
isprint(0x6c aka 'l') = yes (2)
isprint(0x6d aka 'm') = yes (2)
isprint(0x6e aka 'n') = yes (2)
isprint(0x6f aka 'o') = yes (2)
isprint(0x70 aka 'p') = yes (2)
isprint(0x71 aka 'q') = yes (2)
isprint(0x72 aka 'r') = yes (2)
isprint(0x73 aka 's') = yes (2)
isprint(0x74 aka 't') = yes (2)
isprint(0x75 aka 'u') = yes (2)
isprint(0x76 aka 'v') = yes (2)
isprint(0x77 aka 'w') = yes (2)
isprint(0x78 aka 'x') = yes (2)
isprint(0x79 aka 'y') = yes (2)
isprint(0x7a aka 'z') = yes (2)
isprint(0x7b aka '{') = yes (16)
isprint(0x7c aka '|') = yes (16)
isprint(0x7d aka '}') = yes (16)
isprint(0x7e aka '~') = yes (16)
isprint(0x7f aka '') = no (0)

问题在于它为制表符 ('\t') 返回真值 (64)。但是，在没有使用 /MD 编译器选项或一些其他运行时库版本(例如

)进行编译时

cl /MDd isprint.c /Feisprint.exe && isprint.exe

结果是

Microsoft (R) C/C++ Optimizing Compiler Version 19.14.26433 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

isprint.c
Microsoft (R) Incremental Linker Version 14.14.26433.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:isprint.exe
isprint.obj
isprint(0x0 aka ' ') = no (0)
isprint(0x1 aka '') = no (0)
isprint(0x2 aka '') = no (0)
isprint(0x3 aka '') = no (0)
isprint(0x4 aka '') = no (0)
isprint(0x5 aka '') = no (0)
isprint(0x6 aka '') = no (0)
isprint(0x7 aka '') = no (0)
isprint(0x8 aka ') = no (0)
isprint(0x9 aka '       ') = no (0)
isprint(0xa aka '
') = no (0)
isprint(0xb aka '') = no (0)
isprint(0xc aka '') = no (0)
') = no (0) aka '
isprint(0xe aka '') = no (0)
isprint(0xf aka '') = no (0)
isprint(0x10 aka '') = no (0)
isprint(0x11 aka '') = no (0)
isprint(0x12 aka '') = no (0)
isprint(0x13 aka '') = no (0)
isprint(0x14 aka '') = no (0)
isprint(0x15 aka '') = no (0)
isprint(0x16 aka '') = no (0)
isprint(0x17 aka '') = no (0)
isprint(0x18 aka '') = no (0)
isprint(0x19 aka '') = no (0)
isprint(0x1a aka '') = no (0)
isprint(0x1b aka '') = no (0)
isprint(0x1c aka '') = no (0)
isprint(0x1d aka '') = no (0)
isprint(0x1e aka '') = no (0)
isprint(0x1f aka '') = no (0)
isprint(0x20 aka ' ') = yes (64)
isprint(0x21 aka '!') = yes (16)
isprint(0x22 aka '"') = yes (16)
isprint(0x23 aka '#') = yes (16)
isprint(0x24 aka '$') = yes (16)
isprint(0x25 aka '%') = yes (16)
isprint(0x26 aka '&') = yes (16)
isprint(0x27 aka ''') = yes (16)
isprint(0x28 aka '(') = yes (16)
isprint(0x29 aka ')') = yes (16)
isprint(0x2a aka '*') = yes (16)
isprint(0x2b aka '+') = yes (16)
isprint(0x2c aka ',') = yes (16)
isprint(0x2d aka '-') = yes (16)
isprint(0x2e aka '.') = yes (16)
isprint(0x2f aka '/') = yes (16)
isprint(0x30 aka '0') = yes (4)
isprint(0x31 aka '1') = yes (4)
isprint(0x32 aka '2') = yes (4)
isprint(0x33 aka '3') = yes (4)
isprint(0x34 aka '4') = yes (4)
isprint(0x35 aka '5') = yes (4)
isprint(0x36 aka '6') = yes (4)
isprint(0x37 aka '7') = yes (4)
isprint(0x38 aka '8') = yes (4)
isprint(0x39 aka '9') = yes (4)
isprint(0x3a aka ':') = yes (16)
isprint(0x3b aka ';') = yes (16)
isprint(0x3c aka '<') = yes (16)
isprint(0x3d aka '=') = yes (16)
isprint(0x3e aka '>') = yes (16)
isprint(0x3f aka '?') = yes (16)
isprint(0x40 aka '@') = yes (16)
isprint(0x41 aka 'A') = yes (1)
isprint(0x42 aka 'B') = yes (1)
isprint(0x43 aka 'C') = yes (1)
isprint(0x44 aka 'D') = yes (1)
isprint(0x45 aka 'E') = yes (1)
isprint(0x46 aka 'F') = yes (1)
isprint(0x47 aka 'G') = yes (1)
isprint(0x48 aka 'H') = yes (1)
isprint(0x49 aka 'I') = yes (1)
isprint(0x4a aka 'J') = yes (1)
isprint(0x4b aka 'K') = yes (1)
isprint(0x4c aka 'L') = yes (1)
isprint(0x4d aka 'M') = yes (1)
isprint(0x4e aka 'N') = yes (1)
isprint(0x4f aka 'O') = yes (1)
isprint(0x50 aka 'P') = yes (1)
isprint(0x51 aka 'Q') = yes (1)
isprint(0x52 aka 'R') = yes (1)
isprint(0x53 aka 'S') = yes (1)
isprint(0x54 aka 'T') = yes (1)
isprint(0x55 aka 'U') = yes (1)
isprint(0x56 aka 'V') = yes (1)
isprint(0x57 aka 'W') = yes (1)
isprint(0x58 aka 'X') = yes (1)
isprint(0x59 aka 'Y') = yes (1)
isprint(0x5a aka 'Z') = yes (1)
isprint(0x5b aka '[') = yes (16)
isprint(0x5c aka '\') = yes (16)
isprint(0x5d aka ']') = yes (16)
isprint(0x5e aka '^') = yes (16)
isprint(0x5f aka '_') = yes (16)
isprint(0x60 aka '`') = yes (16)
isprint(0x61 aka 'a') = yes (2)
isprint(0x62 aka 'b') = yes (2)
isprint(0x63 aka 'c') = yes (2)
isprint(0x64 aka 'd') = yes (2)
isprint(0x65 aka 'e') = yes (2)
isprint(0x66 aka 'f') = yes (2)
isprint(0x67 aka 'g') = yes (2)
isprint(0x68 aka 'h') = yes (2)
isprint(0x69 aka 'i') = yes (2)
isprint(0x6a aka 'j') = yes (2)
isprint(0x6b aka 'k') = yes (2)
isprint(0x6c aka 'l') = yes (2)
isprint(0x6d aka 'm') = yes (2)
isprint(0x6e aka 'n') = yes (2)
isprint(0x6f aka 'o') = yes (2)
isprint(0x70 aka 'p') = yes (2)
isprint(0x71 aka 'q') = yes (2)
isprint(0x72 aka 'r') = yes (2)
isprint(0x73 aka 's') = yes (2)
isprint(0x74 aka 't') = yes (2)
isprint(0x75 aka 'u') = yes (2)
isprint(0x76 aka 'v') = yes (2)
isprint(0x77 aka 'w') = yes (2)
isprint(0x78 aka 'x') = yes (2)
isprint(0x79 aka 'y') = yes (2)
isprint(0x7a aka 'z') = yes (2)
isprint(0x7b aka '{') = yes (16)
isprint(0x7c aka '|') = yes (16)
isprint(0x7d aka '}') = yes (16)
isprint(0x7e aka '~') = yes (16)
isprint(0x7f aka '') = no (0)

这是怎么回事？大约两周前，我注意到我的应用程序发生了变化。这可能是由某些 Windows 或 Visual Studio 更新引起的吗？我检查了两种情况下的线程区域设置是否相同。

Windows 10 内部版本 17134.165

最佳答案

@Meinersbur 感谢您报告此事。因为我只在我们的构建机器上而不是在我的工作站上看到它，所以我很想了解其中的区别。

为了其他人来到这里，微软的回应(见 https://developercommunity.visualstudio.com/content/problem/297085/changing-result-of-isspacet.html )是:

Tab being reported as a print character by isprint() is a regression in the Universal C Runtime that started appearing with the update KB4338819. It will be fixed in a future servicing update, as well as will be fixed in the next major version of Windows.

The issue isn't related to /MD or /MDd settings. When building with /MD, the Universal C Runtime will be provided by the OS version in System32, which will change with your OS version. When building with /MDd, you will receive the debug version which ships with the Windows SDK and Visual Studio and you will use the most recent version you have installed.

If you wish to have the same behavior as you saw in debug mode on all OSes, you can statically link the C Runtime by building with /MT.

Hope this helps!

Steve WishnouskySoftware Engineer II - Visual C++ Libraries

关于c - isprint ('\t' ) 使用/MD 编译器选项计算为真 (64)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51435249/

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c - isprint ('\t' ) 使用/MD 编译器选项计算为真 (64)