eof

So basically I want to copy everything i write to stdin (including newline char) to string for hash purposes. I managed to accomplish that and made small code to represent my problem. #include <stdio.h> #include <string.h> #include <stdlib.h> #define BUFFERSIZE 10000 int main() { char *myStr = calloc(1,1); char buffer[BUFFERSIZE]; while( fgets(buffer, BUFFERSIZE , stdin) != NULL ){ myStr = realloc(myStr, strlen(myStr)+1+strlen(buffer) ); strcat( myStr, buffer ); } printf("\n%s\n",myStr); } everything works when I enter some text then press ENTER and after I call EOF. But when I start program

This is taken directly from the K&R book: The precedence of != is higher than that of = , which means that in the absence of parentheses the relational test != would be done before the assignment = . So the statement c = getchar() != EOF is equivalent to c = (getchar() != EOF) This has the undesired effect of setting c to 0 or 1, depending on whether or not the call of getchar returned end of file. (More on this in Chapter 2.) Exercise 1-6. Verify that the expression getchar() != EOF is 0 or 1. I am having trouble understanding how to do this exercise as well as understanding what is going on

I need a bash script to read the data stream from a Serial Port (RS232 to USB adapter - Port: /dev/ttyUSB0). The data should be stored line by line in a file until a specific input (for example "eof") appears. I can give any external input to the Serial Port. Till now I use cat to read the data, which works fine. cat /dev/ttyUSB0 -> file.txt The problem is, that I need to finish the command myself by entering cntr+C, but I don't know exactly when the data stream ends and the ttyUSB0 file does not gerenate an EOF. I tried to implement this myself, but did not find a convenient solution. The

This example is from the K&R book #include<stdio.h> main() { long nc; nc = 0; while(getchar() != EOF) ++nc; printf("%ld\n", nc); } Could you explain me why it works that way. Thanks. ^Z^Z doesn't work either (unless it's in the beginning of a line) Traditional UNIX interpretation of tty EOF character is to make blocking read return after reading whatever is buffered inside a cooked tty line buffer. In the start of a new line, it means read returning 0 (reading zero bytes), and incidentally, 0-sized read is how the end of file condition on ordinary files is detected. That's why the first EOF in

std::getline throws exception when it gets an eof . this is how I am doing. std::ifstream stream; stream.exceptions(std::ifstream::failbit|std::ifstream::badbit); try{ stream.open(_file.c_str(), std::ios_base::in); }catch(std::ifstream::failure e){ std::cout << "Failed to open file " << _file.c_str() << " for reading" << std::endl; } while(!stream.eof()){ std::string buffer = ""; std::getline(stream, buffer); //process buffer //I do also need to maintain state while parsing } In the above code getline is throwing exception as it gets eof How to handle this situation ? EDIT std::string buffer =

How can I add a percentage symbol % to the end of the last line in a text file? I do not want the % to be on a new line, it must be at the end of the last line. Thanks! sed '${s/$/%/}' file 来源： https://stackoverflow.com/questions/3657860/bash-append-text-to-last-line-of-file

I'm writing a program which is supposed to read two strings that can contain line breaks and various other characters. Therefore, I'm using EOF (Ctrl-Z or Ctrl-D) to end the string. This works fine with the first variable, but with the second variable, however, this seems to be problematic as apparently something is stuck in the input buffer and the user doesn't get to type in anything. I tried to clean the buffer with while (getchar() != '\n'); and several similar variations but nothing seems to help. All cleaning attempts have resulted in an infinite loop, and without cleaning, adding the

My current code reads user input until line-break. But I am trying to change that to a format, where the user can write input until strg+d to end his input. I currently do it like this: input = raw_input ("Input: ") But how can I change that to an EOF-Ready version? Use file.read : input_str = sys.stdin.read() According to the documentation: file.read([size]) Read at most size bytes from the file (less if the read hits EOF before obtaining size bytes). If the size argument is negative or omitted, read all data until EOF is reached. >>> import sys >>> isinstance(sys.stdin, file) True BTW, dont'