implementing String Manipulation in C: Unexpected Buffer Overflow from `strcat`
I'm migrating some code and I'm trying to implement I've encountered a strange issue with I'm building a feature where I'm working with a buffer overflow scenario when using `strcat` to concatenate strings in my C program..... The code is supposed to append a user input string to a predefined string buffer, but it seems like I'm exceeding the buffer size, leading to unexpected behavior. Here's a simplified version of my code: ```c #include <stdio.h> #include <string.h> #define BUFFER_SIZE 50 int main() { char buffer[BUFFER_SIZE] = "Hello, "; char user_input[BUFFER_SIZE]; printf("Enter your name: "); fgets(user_input, sizeof(user_input), stdin); // Remove the newline character from fgets user_input[strcspn(user_input, "\n")] = 0; strcat(buffer, user_input); printf("Combined message: %s\n", buffer); return 0; } ``` When I run this code and input a name longer than 43 characters (since the initial string "Hello, " takes up 7 characters), I get a segmentation fault. I thought `strcat` would handle the null terminator correctly, but it seems to be writing beyond the bounds of `buffer`. I've tried to check the lengths before concatenating, but I need to seem to implement it correctly. How can I safely concatenate strings without risking a buffer overflow? I've also considered using `snprintf` instead, but I'm not sure how to structure that properly with the existing code. Any insights would be appreciated! This is part of a larger web app I'm building. Thanks, I really appreciate it! Any ideas what could be causing this? Any help would be greatly appreciated!