#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
 #define MAXLINE 1000 /*max line length */
 
int main(void) {
  char *s = malloc(MAXLINE);
  if (!s) {
    perror("malloc");
    exit(EXIT_FAILURE);
  }  
  while(fgets(s, MAXLINE, stdin)) {
    char *newline = strchr(s, '\n');
    if (newline)
      *newline = '\0';
    printf("got: '%s'\n", s);
    if (!strcmp(s, "exit"))
      exit(EXIT_SUCCESS);
  }
  return feof(stdin) ? EXIT_SUCCESS : EXIT_FAILURE;
}

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

c29tZSBpbnB1dApkbyBub3QgZXhpdCB5ZXQKZXhpdAp3b24ndCBiZSBzZWVu

some input
do not exit yet
exit
won't be seen