我创建的文件名末尾的多余字符

Question

I am attempting to learn assembler and am having an issue with this tutorial http://www.tutorialspoint.com/assembly_programming/assembly_file_management.htm

it works fine and dandy except for when it writes out the file. Instead of myfile.txt , it is named myfile.txtWelcome to Tutorials PointWritten to file? .

I can't seem to find out why. I took the source off the tutorial and it does the same thing.

Can someone tell me why?

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I am using nasm 2.12.02. I have also tried it on yasm 1.2.0 so I am pretty sure it's the assembler code causing it.

I am building and running on OpenSUSE Linux 3.16.7-35-default #1 SMP Sun Feb 7 17:32:21 UTC 2016 (832c776) x86_64 x86_64 x86_64 GNU/Linux

Answer 1

You probably left out a , 0 (zero byte) to terminate the string in the .rodata section where you put the string constants you're using for file names and file data.

Linux system calls (like open(2) ) that take char* args accept zero-terminated C-style strings, instead of accepting a string length.