string 装配 GDB 打印字符串
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Assembly GDB Print String
提问by Ken
So in assembly I declare the following String:
所以在汇编中我声明了以下字符串：
Sample db "This is a sample string",0
In GDB I type "p Sample" (without quotes) and it spits out 0x73696854. I want the actual String to print out. So I tried "printf "%s", Sample" (again, without quotes) and it spits out "Cannot access memory at address 0x73696854."
在 GDB 中，我输入“p Sample”（不带引号），它会输出 0x73696854。我想要打印出实际的字符串。所以我尝试了“printf“%s”，Sample”（同样，没有引号），它吐出“无法访问地址0x73696854的内存”。
Short version: How do I print a string in GDB?
简短版本：如何在 GDB 中打印字符串？
回答by Ken
My teacher just emailed me back. For anyone wondering:
我的老师刚刚给我回了电子邮件。对于任何想知道的人：
p(char[20]) Sample
Where 20 is the number of characters to print out.
其中 20 是要打印的字符数。
To print a C-style NUL-terminated string, you should also be able to do this:
要打印 C 样式NUL终止的字符串，您还应该能够执行以下操作：
print (char*) &Sample
printf "%s", &Sample
回答by orustam
I had the same issue! Try this one:
我遇到过同样的问题！试试这个：
x/s &Sample # prints the whole string
"x" - Stands generally for examining data.
“x” - 通常代表检查数据。
For a signle character you could youse this code
对于单字符，您可以使用此代码
x/c &Sample # prints: "T"
And if you want see multiple characters you could give the number of wished characters
如果你想看到多个字符，你可以给出想要的字符数
x/3c &Sample # prints: "T" "h" "i"
