在C中将字符串拆分为整数数组

问题描述

我正在放在一起的C应用程序中有一个逗号分隔的字符串，我想将其拆分为整数值数组。
该字符串可以包含任意数量的逗号分隔值，因此我也没有数组的初始大小。

I have a comma delimited string in a C app that I'm putting together and I want to split it into an array of integer values.The string could contain any number of comma delimited values so I also dont have an initial size for the array.

例如。

"345,3345,35,75,52,386"

和id喜欢做类似的事情...

and id like to do something like...

int parsedArray[] = parseString("345,3345,35,75,52,386");

这在Java或C＃中都是轻而易举的，但我认为我有点不了解涉及到C。
关于如何实现此目标的任何想法吗？

This would be a breeze in java or c# but I think I'm a little out of my depth when it comes to C.Any ideas of how to achieve this?

推荐答案

签名暗含的函数在C中无法发表您的文章，因为函数无法返回动态大小的数组。这里有两个选择：

A function with the signature implied in your post is not possible in C, because a function cannot return a dynamically-sized array. Two choices are possible here:

• 将数组和最大计数传递到 parseString ，或


• 返回表示动态分配的数组及其实际大小的指针。

• Pass an array and the max count into parseString, or
• Return a pointer representing a dynamically allocated array, along with its actual size.

第一种方法将数组的大小限制为调用者确定的某个数字；第二种方法要求在完成处理后重新分配数组。

The first approach limits the size of the array to some number established by the caller; the second approach comes with a requirement to deallocate the array once you are done with it.

第一种方法的功能如下：

The function that follows the first approach would look like this:

void parseString(int data[], size_t maxSize);

第二种方法的功能如下：

The function that follows the second approach would look like this:

int *parseString(size_t *actualSize);

或类似这样：

void parseString(int ** data, size_t *actualSize);

第二种情况可以用来组合这两种方法，尽管API会变得不太直观。

The second case can be used to combine the two approaches, although the API would become somewhat less intuitive.

至于解析本身，存在许多选项。 轻量级选项之一是使用 strtol ，例如：

As for the parsing itself, many options exist. One of the "lightweight" options is using strtol, like this:

char *end = str;
while(*end) {
    int n = strtol(str, &end, 10);
    printf("%d\n", n);
    while (*end == ',') {
        end++;
    }
    str = end;
}

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