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This noncompliant code example attempts to remove the trailing new-line (\n) from an input line. The fgets() function is typically used to read a new-line terminated-line of input from a stream. It takes a size parameter for the destination buffer and copies, at most, size-1 characters from a stream to a character array.

char buf[BUFSIZ + 1];

if (fgets(buf, sizeof(buf), stdin) == NULL) {
  /* Handle error */
}
buf[strlen(buf) - 1] = '\0';

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This compliant solution uses strchr() to replace the new-line character in the string, if it exists. (See rue FIO36-C. Do not assume a new-line character is read when using fgets().)

char buf[BUFSIZ + 1];
char *p;

if (fgets(buf, sizeof(buf), stdin)) {
  p = strchr(buf, '\n');
  if (p) {
    *p = '\0';
  }
}
else {
  /* Handle error condition */
}

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