我正在进行插入，这意味着一个文件、一个字符串和一个新文件，它将接收原始文件的所有数据以及要插入的字符串，它将替换原始文件。
因此，例如，我的原始文件：
数据.txt
line1
line2
line3
line4
line5
随着字符串“换行符”的插入，将变为：
data_temp.txt --> 稍后重命名data.txt
line1
line2
line3
line4
line5
newline
为此，我有以下代码：
/* FILE variables of the original file and the new file */
FILE *data, *data_temp;
data = fopen( "data.txt", "r" );
data_temp = fopen( "data_temp.txt", "w" );
/* String buffer */
char buf[256];
int i_buf;
/* The string to be inserted in the new file */
char newline[10] = "newline";
/* For each line of the original file, the content of each line
is written to the new file */
while(!feof(data))
{
/* Removing the \n from the string of the line read */
fgets(buf, MAX_INSERT, data);
for(i_buf = strlen(buf)-1; i_buf && buf[i_buf] < ' '; i_buf--)
buf[i_buf] = 0;
/* Writing the string obtained to the new file */
fputs(buf, data_temp);
fputs("\n", data_temp);
}
/* The string will be inserted at the final of the new file */
if(feof(datos))
{
fputs(newline, datos_temp);
}
/* Closing both files */
fclose(data);
fclose(data_temp);
/* The original file is deleted and replaced with the new file */
remove ("data.txt");
rename ("data_temp.txt", "data.txt");
我的问题基本上是写入原始文件，写入新文件。原始文件的最后一行在新文件中显示重复。
在给出的示例中：
数据.txt
line1
line2
line3
line4
line5
第5 行（原始文件的最后一行）在新文件中显示两次，然后是要插入的字符串。
data_temp.txt --> 稍后重命名data.txt
line1
line2
line3
line4
line5
line5
newline
我坚信问题在于读取原始文件（AKAwhile(!feof(data))循环），检查 EOF、fgets 或 fputs。有什么办法解决这个问题吗？