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After the loop ends, if feof(stdin) != 0, the loop has read through to the end of the file without encountering a newline character. Similarly, if ferror(stdin) != 0, a read error occurred before the loop encountered a newline character, and if chars_read > index, the input string has been truncated. void FIO34-C. Use int to capture the return value of character IO functions that might be used to check for end of file is also applied in this solution.

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while (((ch = getchar()) != '\n') && ch != EOF)

See void FIO35-C. Use feof() and ferror() to detect end-of-file and file errors when sizeof(int) == sizeof(char) for the case where feof() and ferror() must be used instead.

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#define BUF_LENGTH 1024

#include <stdio.h>
void get_data(void) {
  enum { BUF_LENGTH = 1024 };
  char buf[BUF_LENGTH];
  fscanf(stdin, "%s", buf); */
  /* rest of function
}

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#define BUF_LENGTH 1024
#include <stdio.h>
void get_data(void) {
  enum { BUF_LENGTH = 1024 };
  char buf[BUF_LENGTH];
  fscanf(stdin, "%1024s", buf);
  /* rest of function */
}

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