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In this compliant solution, characters are no longer copied to buf once index == BUFFERSIZE - 1, leaving room to null-terminate the string. The loop continues to read characters until the end of the line, the end of the file, or an error is encountered. When chars_read > index truncated == true, the input string has been truncated.
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#include <stdio.h>
enum { BUFFERSIZE = 32 };
void func(void) {
char buf[BUFFERSIZE];
int ch;
size_t index = 0;
size_t chars_readbool truncated = 0false;
while ((ch = getchar()) != '\n' && ch != EOF) {
if (index < sizeof(buf) - 1) {
buf[index++] = (char)ch;
} else {
chars_read++ truncated = true;
}
}
buf[index] = '\0'; /* Terminate string */
if (ch == EOF) {
/* Handle EOF or error */
}
if (chars_read > indextruncated) {
/* Handle truncation */
}
}
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