c - 将字符串的 CSV 文件解析为二维字符串数组

Question

我有一个 CSV 字符串，如下所示:

"","Orange","","","","","","Red",""
"Orange","","Blue","","","","","Black",""
"","Blue","","Pink","","Any","","","Any"
"","","Pink","","Green","Red","","",""
"","","","Green","","Blue","","",""
"","","Any","","BLue","","Orange","",""
"","","","Red","","Orange","","Green","Black"
"Red","Black","","","","","Green","","Yellow"
"","","Any","","","","Black","Yellow",""

我想将它放入二维字符串数组中(稍后我将忽略引号)。我尝试了许多不同的想法，但似乎无法正常工作。

此代码很接近，但输出以我无法理解的方式关闭。它还正确地解析和标记文件。将 token 放入数组时似乎变坏了。这是从我的程序中获取的代码:

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

 #define VERTICES 9

 int main(void)
 {
     const char *colors[VERTICES][VERTICES];

     char buffer[1024];
     char *record, *line;
     int i = 0;
     int j = 0;
     FILE *fstream = fopen("Colors.dat", "r");
     if (fstream == NULL)
     {
         printf("\n file opening failed\n");
         return -1;
     }
     while ((line = fgets(buffer, sizeof(buffer), fstream)) != NULL)
     {
         record = strtok(line, ",");
         while(record != NULL)
         {
             printf(" %s", record);
             colors[i][j] = record;
             //printf(" %s"), colors[i][j];
             record = strtok(NULL, ",");
             j++;
         }
         j = 0;
         ++i;
     }

     printf("\n============================================\n\n");

     for (i = 0; i < VERTICES; i++)
     {
             for (j = 0; j < VERTICES; j++)
             {
                 printf("%s | ", colors[i][j]);
             }
         printf("\n");
     }
     return 0;
 }

如果您取消注释第二个嵌套 while 循环中的行并注释掉两个 for 循环，您也会得到奇怪的输出。谢谢!

Answer 1

OP 是简单地记录读取缓冲区的地址，该地址会在后续读取时更新。

需要分配/复制字符串供以后使用。

// colors[i][j] = record;
colors[i][j] = strdup(record);

一行中剩余的 colors[i][j] 应设置为 NULL。

     while(j < VERTICES && record != NULL) {
         printf(" %s", record);
         colors[i][j] = strdup(record);
         assert(colors[i][j]);
         record = strtok(NULL, ",");
         j++;
     }
     while(j < VERTICES) {
         colors[i][j] = NULL;
         j++;
     }

健壮的代码还会检查分配失败 (assert(colors[i][j]) 并在完成后释放内存。