advanced patterns When Using `fgets` with Custom Delimiters in C - String Not Terminating as Expected
I'm working through a tutorial and I've been banging my head against this for hours... I've been banging my head against this for hours... I'm working with an scenario while trying to read a line from a file using `fgets` with custom delimiters. I want to read a CSV file line by line and split each line into fields based on commas. However, I'm working with unexpected behavior where the strings are not terminating correctly, which leads to buffer overflows. I am using GCC version 11.2.0 on Ubuntu 20.04. Here's a simplified version of my code: ```c #include <stdio.h> #include <stdlib.h> #include <string.h> #define MAX_LINE_LENGTH 1024 void process_line(char *line) { char *field; field = strtok(line, ","); while (field != NULL) { printf("Field: %s\n", field); field = strtok(NULL, ","); } } int main() { FILE *file = fopen("data.csv", "r"); char line[MAX_LINE_LENGTH]; if (file == NULL) { perror("Failed to open file"); return EXIT_FAILURE; } while (fgets(line, sizeof(line), file)) { process_line(line); } fclose(file); return 0; } ``` I expected `fgets` to read each line correctly, but sometimes, the output for certain rows is not as I anticipated. It seems that the last field sometimes gets corrupted. For example, if the line ends without a newline, the next line concatenates with it in unexpected ways. I’ve tried adding a check for the newline character in `process_line`, but it didn’t resolve the scenario. Has anyone else faced this question, or could there be something wrong with how I'm using `fgets` and `strtok`? Any insights on best practices for reading CSV files in C would also be appreciated! This is part of a larger CLI tool I'm building. I'd really appreciate any guidance on this. I'm working with C in a Docker container on Windows 10. What's the correct way to implement this? I'm using C 3.10 in this project. Thanks for your help in advance! Any suggestions would be helpful. I'm working on a CLI tool that needs to handle this. Any ideas how to fix this?