Linux内核中如何将char[]字符串转换为int?

问题描述

linux内核如何将char[]转为int

How convert char[] to int in linux kernel

验证输入的文本实际上是一个整数?

with validation that the text entered is actually an int?

int procfile_write(struct file *file, const char *buffer, unsigned long count,
       void *data)
{

   char procfs_buffer[PROCFS_MAX_SIZE];

    /* get buffer size */
   unsigned long procfs_buffer_size = count;
   if (procfs_buffer_size > PROCFS_MAX_SIZE ) {
       procfs_buffer_size = PROCFS_MAX_SIZE;
   }

   /* write data to the buffer */
   if ( copy_from_user(procfs_buffer, buffer, procfs_buffer_size) ) {
       return -EFAULT;
   }

   int = buffer2int(procfs_buffer, procfs_buffer_size);

   return procfs_buffer_size;
}

推荐答案

在 在您友好的 linux 源代码树中.

See the various incarnations of kstrtol() in #include <include/linux/kernel.h> in your friendly linux source tree.

您需要哪个取决于 *buffer 是用户地址还是内核地址，以及您对错误处理/检查缓冲区内容的需求有多严格(例如，123qx 无效还是应该返回 123 ?).

Which one you need depends on whether the *buffer is a user or a kernel address, and on how strict your needs on error handling / checking of the buffer contents are (things like, is 123qx invalid or should it return 123 ?).

这篇关于Linux内核中如何将char[]字符串转换为int?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！