从C中的文本文件读取，在模式中找到换行符和空格

Question

I am reading from a textfile and there is a pattern. I am currently reading the file with help of tokens. There are many lines and the pattern breaks if there are any spaces or row breaks after the pattern is finished. This is what I have tried so far:

char newLine[10];
strcpy(newLine, "\n");
int stringValue;
....
*readfromfile*
{
    ...
    stringValue = strcmp(token, newLine);
    if(stringValue == 0)
    {
        ...

So if there is a new line or blank space after the line I want the if statement to go through. Does anyone know how to solve this? Is it that token doesn't aquire the character, " " and "\\n". If so, what can I do to solve it?

Answer 1

Just trim(newline) before calling strcmp() . trim() will remove any blanks at the beginning or the end of the string.

You can found an example in C in this question .

There's another way: if there's blanks at the end of newLine that you don't want to compare by using strcmp() , use strncmp() instead (with the length of token ).

Answer 2

As per your comment you are reading buffer first and then want to remove characters then do as below example, (with assumption your buffer size is of 1024)

int RemoveTokens(char *string)
{
   char  buf[1024] = {0};
   int   i         = 0;
   int   j         = 0;

   strncpy(buf, string, 1024);
   memset(string, 0x00, 1024);
   for (i=0; i<1024; i++)
   {
      if (' ' != buf[i] && '\n' != buf[i])
      {
         string[j] = buf[i];
         j++;
      }
   }
}

Hope it will helps you to do it easily. :D