更改数组中的 A 字符串时出现 C 分段错误

Question

我有这个指向字符串的指针数组，在 Main 函数上方定义为 public：

char *Code[]={"MAIN:  add r3,  LIST",
            "LOOP: prn #48",
            "lea STR, r6",
            "inc r6",
            "mov r3, K",
            "sub r1, r4",
            "bne END",
            "cmp val1, #-6",
            "bne %END",
            "dec K",
            "jmp %LOOP",
            "END: stop",
            "STR: .string “abcd”",
            "LIST: .data 6, -9",
            ".data -100",
            ".entry K",
            "K: .data 31"};

我写了一个函数，假设在一行中查找是否有一系列制表符和 spaces，如果有，它应该更改字符串，以便只有一个 space或选项卡：

void SpaceTabRemover()//function to make sure there are no two tabs or spaces following eachother
{
    int i,j=0,k=0; //i=which line we are at, j=which char of the line we ar at, k=placeholder for the last char which equal to space or tab
    for(i=0;i<sizeof(Code)/sizeof(Code[0]);i++)
    {
        while(Code[i][j])
        {
            if ((Code[i][j]==' '||Code[i][j]=='\t')&&(Code[i][j+1]==' '||Code[i][j+1]=='\t'))//checks if there is a sequence of tabs and spaces
            {
                Code[j][k++]=Code[i][j];
            }
            j++;
        }
        Code[j][k]='[=11=]';
    }
}

我认为代码看起来应该可以工作，除非我写错了并且看不到它，

我的问题是当函数确实在一行中找到两个 space 或制表符并尝试更改字符串时，我遇到了一个以前从未见过的错误：

Program recieved signal SIGSEGV segmentation fault in SpaceTabRemover() at main.c.112 Code[j][k++]=Code[i][j]

这个错误是什么意思，我该如何解决？

Answer 1

arrya Code 的元素是指向字符串文字的指针，不允许修改。

您必须在修改字符串之前将字符串复制到可修改缓冲区。

#include <stdlib.h> // for malloc() and exit()
#include <string.h> // for strlen() and strcpy()

void SpaceTabRemover()//function to make sure there are no two tabs or spaces following eachother
{
    int i,j=0,k=0; //i=which line we are at, j=which char of the line we ar at, k=placeholder for the last char which equal to space or tab
    for(i=0;i<sizeof(Code)/sizeof(Code[0]);i++)
    {
        // allocate buffer and copy strings
        char* buffer = malloc(strlen(Code[i]) + 1); // +1 for terminating null-character
        if (buffer == NULL) exit(1); // check if allocation succeeded
        strcpy(buffer, Code[i]); // copy the string
        Code[i] = buffer; // assign the copied string to the element of array

        while(Code[i][j])
        {
            if ((Code[i][j]==' '||Code[i][j]=='\t')&&(Code[i][j+1]==' '||Code[i][j+1]=='\t'))//checks if there is a sequence of tabs and spaces
            {
                Code[j][k++]=Code[i][j];
            }
            j++;
        }
        Code[j][k]='[=10=]';
    }
}

更改数组中的 A 字符串时出现 C 分段错误

C segmentation error when changing A string in array

c

segmentation-fault

arrayofstring