C程序分段错误main（）

我是C编程的新手，我已经根据需求规范编写了一段代码，但我总是遇到分段错误，无法继续。 如果文件名为“code.c”，并且运行时出现错误，即未传递参数（文件名）。但是如果文件名被传递，我们就陷入了分段错误。 如有任何帮助/建议，将不胜感激

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>



struct _data 
{               
   char *firstName;
   char *lastName;
   long number;
}; 

// SCAN FILE
int SCAN(FILE *(*stream))
{
    *stream = fopen("inputFile.data", "r");

    int ch = 0, lines = 0;

    while (!feof(*stream))
    {
        ch = fgetc(*stream);
        if (ch == '\n')
        {
            lines++;
        }
    }
    return lines;
}

// LOAD FILE
struct _data *LOAD(FILE *stream, int size) 
{
    int i;
    size_t chrCount;
    char *text, *number, *firstName, *lastName;
    struct _data *BlackBox;

    if ((BlackBox = (struct _data*)calloc(size, sizeof(struct _data))) == NULL) 
    {
          printf("ERROR - Could not allocate memory.\n");
          exit(0);
    }

    rewind(stream);


    for (i = 0; i < size; i++) 
    {
        getline(&text, &chrCount, stream);
        firstName   = strtok(text, " ");
        lastName    = strtok(text, " ");
        number      = strtok(NULL, "\n");

        // Allocate memory for name part of struct.
        if ((BlackBox[i].firstName = (char*)calloc(strlen(firstName), sizeof(char))) == NULL) 
        {
           printf("ERROR - Could not allocate memory.\n");
           exit(0);
        }
        if ((BlackBox[i].lastName = (char*)calloc(strlen(lastName), sizeof(char))) == NULL)
        {
           printf("ERROR - Could not allocate memory.\n");
           exit(0);
        }

        strcpy(BlackBox[i].firstName, firstName);
        strcpy(BlackBox[i].lastName, lastName);
        BlackBox[i].number = atol(number);
    }
    fclose(stream);
    return BlackBox;
}


void SEARCH(struct _data *BlackBox, char *name, int size, int inputs) 
{
    int i;
    int found = 0;
    char *search = " ";
    char *firstName;
    char *lastName; 

    if (inputs == 2)
    {
        firstName = strtok(name, search);
        lastName = strtok(NULL, search);
    }


    printf("*******************************************\n");
    if (inputs == 2)
    {   
        for (i = 0; i < size; i++) 
        {          
            if (!strcasecmp(firstName, BlackBox[i].firstName) && !strcasecmp(firstName, BlackBox[i].firstName))
            {
                printf("The name was found at the %d entry.\n", i);
                found = 1;
                break;
            }
        }
    }
    else
    {
        for (i = 0; i < size; i++) 
        {          
            if (!strcasecmp(firstName, BlackBox[i].firstName) || !strcasecmp(firstName, BlackBox[i].firstName))
            {
                printf("The name was found at the %d entry.\n", i);
                found = 1;
                break;
            }
        }
    }

    if (found == 0) 
    {
          printf("The name was NOT found.\n");
    }
    printf("*******************************************\n");
}

// FREE MEMORY
void FREE(struct _data *BlackBox, int size) 
{
    int i;
    for (i = 0; i < size; i++) 
    {
        free(BlackBox[i].firstName);
        free(BlackBox[i].lastName);
    } 
    free(BlackBox);
    BlackBox = NULL;
}


// MAIN
int main(int argv, char **argc) 
{
    int size;
    FILE *stream;
    struct _data *BlackBox;

    // argv == 1 WORKS, Below message is printed.
    if (argv == 1) 
    {          
        printf("*******************************************\n");
        printf("* You must include a name to search for.  *\n");
        printf("*******************************************\n");
    }
    // argv == 2 DOES NOT WORK, Segmentation Fault.     
    if (argv == 2) 
    {
        size = SCAN (&stream);
        BlackBox = LOAD(stream, size);
        SEARCH(BlackBox, argc[1], size, 1);
    }
    if (argv == 3) 
    {
        size = SCAN(&stream);
        BlackBox = LOAD(stream, size);
        SEARCH(BlackBox, argc[2], size, 2);
    }
    return 0;
}

#包括
#包括
#包括
#包括
结构数据
{               
char*名字；
char*lastName；
长数；
}; 
//扫描文件
整数扫描（文件*（*流））
{
*stream=fopen（“inputFile.data”，“r”）；
int ch=0，线条=0；
而（！feof（*stream））
{
ch=fgetc（*流）；
如果（ch='\n'）
{
行++；
}
}
回流线；
}
//加载文件
结构数据*加载（文件*流，整数大小）
{
int i；
大小和数量；
字符*文本，*数字，*名字，*姓氏；
结构数据*黑盒；
if（（BlackBox=（struct\u data*）calloc（size，sizeof（struct\u data）））==NULL）
{
printf（“错误-无法分配内存。\n”）；
出口（0）；
}
倒带（流）；
对于（i=0；i

此代码中存在问题：

    firstName   = strtok(text, " ");
    lastName    = strtok(text, " ");
    number      = strtok(NULL, "\n");

第二个

strtok（）

调用应传递

NULL

作为其第一个参数。实际上，第三个

strtok（）

调用肯定会返回

NULL

，因为第一个调用修改

text

的方式是第二个调用消耗整个内容（当从一开始再次标记时，这是错误的）。但是，您不需要对此进行测试，因此，

atol（）

尝试取消对空指针的引用

更新：

此外，正如@chqrlie和后来的@JamesWilkins所观察到的，您没有为

BlackBox[i].firstName

和

BlackBox[i].lastName分配足够的空间，因为您还需要为字符串终止符分配空间。这是一个完全独立的问题，也可能产生segfault。我喜欢@chqrlie建议切换到
strdup（）
，但只需将每个分配增加一个单位就足够了

更新2：

此外，您对这一行有疑问：

    getline(&text, &chrCount, stream);

在第一次调用之前，您不会初始化变量
text
，因此它包含一个垃圾值。函数仅在其第一个参数指向空指针时分配缓冲区；否则，它会将行写入通过取消引用第一个参数获得的指针指向的缓冲区。写入内存中的随机位置肯定会产生未定义的行为，这在实践中通常表现为错误

此外，除非您可以相信文件的任何一行都不会比第一行长，否则您还需要在每个循环迭代结束时释放
文本
指针，并将其值重置为
NULL
，以便
getline（）
在下一个itera上分配新的缓冲区
    getline(&text, &chrCount, stream);

#include <iostream>

using namespace std;

struct _data
{
    char *firstName;
    char *lastName;
    long number;
};

// SCAN FILE
int SCAN(FILE *(*stream))
{
    *stream = fopen("inputFile.data", "r");
    if (*stream == NULL)
    {
        perror("Error opening file");
        return 0;
    }

    char ch = 0, lines = 0, linesize = 0;

    while ((ch = fgetc(*stream)) != EOF)
    {
        if (ch == '\n')
        {
            lines++;
            linesize = 0;
        }
        else linesize++;
    }

    if (linesize > 0)
        lines++; // (last line doesn't have '\n')

    return lines;
}

// LOAD FILE
struct _data *LOAD(FILE *stream, int lineCount)
{
    int i;
    size_t chrCount = 256;
    char text[256], *result, *number, *firstName, *lastName;
    struct _data *BlackBox;

    if ((BlackBox = (struct _data*)calloc(lineCount, sizeof(struct _data))) == NULL)
    {
        printf("ERROR - Could not allocate memory.\n");
        exit(0);
    }
    else memset(BlackBox, 0, sizeof(struct _data) * lineCount); // (make sure all data members are null to begin)

    rewind(stream);


    for (i = 0; i < lineCount; i++)
    {
        result = fgets(text, chrCount, stream);
        if (result == NULL)
            break; // (EOF)

        firstName = strtok(text, " ");
        lastName = strtok(NULL, " ");
        number = strtok(NULL, "\n");

        // Allocate memory for name part of struct.
        if ((BlackBox[i].firstName = (char*)calloc(strlen(firstName) + 1, sizeof(char))) == NULL)
        {
            printf("ERROR - Could not allocate memory.\n");
            exit(0);
        }
        if ((BlackBox[i].lastName = (char*)calloc(strlen(lastName) + 1, sizeof(char))) == NULL)
        {
            printf("ERROR - Could not allocate memory.\n");
            exit(0);
        }

        strcpy(BlackBox[i].firstName, firstName);
        strcpy(BlackBox[i].lastName, lastName);
        BlackBox[i].number = atol(number);
    }

    fclose(stream);

    return BlackBox;
}


void SEARCH(struct _data *BlackBox, char **names, int lineCount, int inputs)
{
    int i, l;
    int found = 0;

    printf("*******************************************\n");

    for (i = 0; i < inputs; ++i)
    {
        for (l = 0; l < lineCount; ++l)
        {
            if (BlackBox[l].firstName != NULL && !_stricmp(names[i], BlackBox[l].firstName)
                || BlackBox[l].lastName != NULL && !_stricmp(names[i], BlackBox[l].lastName))
            {
                printf("The name was found on line %d.\n", 1 + l);
                found = 1;
                break;
            }
        }
        if (found) break;
    }

    if (!found)
        printf("The name was NOT found.\n");

    printf("*******************************************\n");
}

// FREE MEMORY
void FREE(struct _data *BlackBox, int lineCount)
{
    int i;
    for (i = 0; i < lineCount; i++)
    {
        if (BlackBox[i].firstName != NULL)
            free(BlackBox[i].firstName);
        if (BlackBox[i].lastName != NULL)
            free(BlackBox[i].lastName);
    }
    free(BlackBox);
}


// MAIN
int main(int argc, char **argv)
{
    int lineCount;
    FILE *stream;
    struct _data *BlackBox;

    // argc == 1 WORKS, Below message is printed.
    if (argc == 1)
    {
        printf("*******************************************\n");
        printf("* You must include a name to search for.  *\n");
        printf("*******************************************\n");
    }
    // argc == 2 DOES NOT WORK, Segmentation Fault.     
    if (argc > 1)
    {
        lineCount = SCAN(&stream);
        if (lineCount > 0)
        {
            BlackBox = LOAD(stream, lineCount);
            SEARCH(BlackBox, argv + 1, lineCount, argc - 1);
            FREE(BlackBox, lineCount);
        }
    }
    return 0;
}