将int列表转换为字符串-C

发布于 2025-02-02 16:57:54 字数 408 浏览 4 评论 0原文

我试图将整数列表转换为紧凑的字符串，但我会得到一个分段故障。代码如下：

    int *factors = job_factorization(number, size);
    char buffer[250] = { 0 };

    for (int i = 0; i < *size; i++) {
        sprintf( &buffer[i],  "%d ", *factors);
        factors++;
    }

job_factorization函数返回列表的头部（它有效，我已经对其进行了测试），它将指向size size指向的值设置为列表的实际大小（因此整数的数量）。我不知道有什么问题，有人有任何想法吗？

原文

I was trying to convert a list of integers into a compact string but I get a segmentation fault.
The code is the following:

    int *factors = job_factorization(number, size);
    char buffer[250] = { 0 };

    for (int i = 0; i < *size; i++) {
        sprintf( &buffer[i],  "%d ", *factors);
        factors++;
    }

The job_factorization function returns the head of the list (it works, I have already tested it), and it sets the value pointed to by size to the actual size of the list (so the number of integers).
I cannot figure out what is wrong, does anyone have any idea?

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半﹌身腐败 2025-02-09 16:57:54

请注意以下备注：

sprintf（＆amp; buffer [i]，“％d”， *factor）;在上一个转换结束时不会转换数字。
sprintf不检查缓冲区溢出：如果size足够大，它最终会在缓冲区的末端以外写入。
修改因素可能不是一个好主意，因为使用后应释放此指针。

这是一种替代方法：

    int *factors = job_factorization(number, size);
    char buffer[1024];
    size_t pos = 0;

    for (int i = 0; pos < sizeof buffer && i < *size; i++) {
        pos += snprintf(buffer + pos, sizeof buffer - pos, "%d ", factors[i]);
    }

您还可以使用2个循环来计算转换所需的尺寸并分配所需的空间。

Note these remarks:

sprintf( &buffer[i], "%d ", *factors); does not convert the number at the end of the previous conversion.
sprintf does not check for buffer overflow: if size is large enough, it will eventually write beyond the end of the buffer.
modifying factors is probably not a good idea as this pointer should be freed after use.

Here is an alternative:

    int *factors = job_factorization(number, size);
    char buffer[1024];
    size_t pos = 0;

    for (int i = 0; pos < sizeof buffer && i < *size; i++) {
        pos += snprintf(buffer + pos, sizeof buffer - pos, "%d ", factors[i]);
    }

You could also use 2 loops to compute the size needed for the conversion and allocate the space needed.

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