Check for carriage return at the end of a file

I have a text file. I have to check to ensure 开发者_如何学Cthat the file is ending with a Carriage return. If it is not ending with one then I would like to insert one. The file now being of the correct format I can use it for further parsing. It should work in both Windows & Linux environments.

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Try something like this (not tested):

FILE *file = fopen(path, "r+");
char c;
fseek(file, -1, SEEK_END);
fread(&c, 1, 1, file);
if (c != '\r') { /* This will work on Win/Linux and also on a Mac */
  fseek(file, 0, SEEK_END);
  fprintf(path, "\r");
}
fclose(file);

Note: Are you sure you mean 0x0D? In Linux, lines are ended by 0x0A (\n) and in Windows by the combination 0x0D 0x0A (\r\n).

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see i have prepare one file

    FILE *b = fopen("jigar.txt","w");
    fprintf(b,"jigar\r");
    fclose(b);

now i have again open that file for checking

 b = fopen("jigar.txt","r");
 char f;

go to end of file to last

while(fscanf (b, "%c", &f) != EOF);

go 1 byte previous

  fseek( b,-1,1);

read that byte

    fscanf(b,"%c",&f);

check it

    if(f == 13)  \\ here instead of 13 you can writr '\r'
        printf("\r is detected");
    else
          write \r to file...

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#include <stdio.h>

void main()
{

    FILE *file = fopen("me.txt", "r+"); // A simple text file created using vim 

    char buffer[100] ;

    fseek(file, -2, SEEK_END); // Fetches the last 2 characters of the file 

    fread(buffer,1,2,file); // Read the last 2 characters into a buffer 

    printf("\n Character is %s",buffer); // Will print the entire contents of the buffer . So if the line ends with a "\n" we can expect a new line to be printed 

    //Since i am interested to know how the line feeds & Carriage returns are added to the end of the file , i try to print then both . I have run this code under Suse Linux and if i press enter key after the last line in the file i get two "\n" in the output . I confirmed this using GDB . I would like to run in a Windows environment and check how the behavior changes if any .
    printf(" --is %c",buffer[1]);
    printf(" --is %c",buffer[2]);

    if(buffer[1]=='\r' || buffer[2]=='\n')
    //take action 
    else 
    // take another action


    fclose(file);
}