C：Getline不会读取完整的文档

发布于 2025-01-30 02:12:27 字数 801 浏览 3 评论 0原文

我需要在带有getline的大XML文件中编写C读取程序，问题只有大约30亿行的2085。在以下代码中，问题发生。

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>

int main()                                          
{
    size_t l = 0;
    char *line;

    line = NULL;
    while (getline(&line,&l,stdin)>0) {

        getline(&line,&l,stdin);
        printf("%s\n", line);
        printf("%i\n", i);

        free(line);
        line = NULL;
    }
    return 0;
}

我的第一个目标是用printf显示线条，以便我可以使用。 2080年直到2090年的行都不是空的。如果我将循环条件更改为＆gt; = 0约80.000，并且如果我将printf评论为130.00行。但是相反，我会遇到一个细分错误。在这种情况下，我真的不知道该如何解决。我正在使用Visual Studio代码编辑和Mysys2 mingw在Windows 11上运行代码。首先找不到getline函数，我通过复制将这个页面，因为#include头球似乎不起作用。

原文

I need to write a program in C reading in a big XML file with getline, the problem is only 2085 of the approxemately 3 billion lines are read. In the following code the problem occurs.

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>

int main()                                          
{
    size_t l = 0;
    char *line;

    line = NULL;
    while (getline(&line,&l,stdin)>0) {

        getline(&line,&l,stdin);
        printf("%s\n", line);
        printf("%i\n", i);

        free(line);
        line = NULL;
    }
    return 0;
}

My first goal would be to display the lines, with printf so I can work with that.
Neither line from 2080 til 2090 is empty.
If I change the loop-condition to >=0 about 80.000 are read in and if I comment the printf out, about 130.00 lines. But instead I get an segmentation error. Which I really don't know how to solve in this case.
I am using Visual Studio Code to edit and MYSYS2 MinGW to run the Code, on Windows 11.
First the getline Function couldn't be found, I resolved it by Copy-Pasting the getline Code of this page, because the #include header's seemed not to work.

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懒的傷心 2025-02-06 02:12:27

在阅读中的行时，您会跳过每一行，而则在中再次阅读，然后在当时的身体中再次读取它，
您的内存泄漏（与点1相同的原因）

int main(void)                                          
{
    size_t l = 0;
    ssize_t retVal;
    char *line;

    line = NULL;
    do 
    {
        if((retVal = getline(&line,&l,stdin)) != -1)
        {
            printf("Buff_size:%zu Line_length: %zd Line:\"%s\"\n", l, retVal, line);

        }
    }while(retVal != -1);
    free(line);
    return 0;
}

You skip every second line as you read the line in the while then you read it again in the while body
You have a memory leak (same reason as point 1)

int main(void)                                          
{
    size_t l = 0;
    ssize_t retVal;
    char *line;

    line = NULL;
    do 
    {
        if((retVal = getline(&line,&l,stdin)) != -1)
        {
            printf("Buff_size:%zu Line_length: %zd Line:\"%s\"\n", l, retVal, line);

        }
    }while(retVal != -1);
    free(line);
    return 0;
}

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