9fc68e1b72
Separates some functions into their own files separates some big functions in to smaller ones to help improve the code cleans up some stuff
125 lines
2.4 KiB
C
125 lines
2.4 KiB
C
#include <curl/curl.h>
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#include <cjson/cJSON.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "curl.h"
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#include "json.h"
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#define FILE_NAME "books.csv"
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#define MAX_BUF_LEN 1024
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void print_book(book_t* book)
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{
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printf("ISBN: %s\n", book->isbn);
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printf("Title: %s\n", book->title);
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printf("Author(s): %s\n", book->authors);
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printf("(First) Year of Publication: %d\n", book->year_of_publication);
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printf("Page length: %d\n", book->page_len);
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}
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void write_to_file(book_t* book)
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{
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FILE* file;
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int file_exists;
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/**
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* We want to check if the file exists
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* if it doesnt, we create a new one
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* otherwise, we write to the existing one
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*/
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file_exists = access(FILE_NAME, F_OK);
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if (0 != file_exists) {
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file = fopen(FILE_NAME, "w");
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fprintf(file, "isbn,title,authors,year of publication,page length\n");
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} else {
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file = fopen(FILE_NAME, "a");
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}
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// now we write the information
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fprintf(file, "\"%s\",\"%s\",\"%s\",%d,%d\n",
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book->isbn, book->title, book->authors, book->year_of_publication, book->page_len);
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fclose(file);
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}
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int main(int argc, char* argv[])
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{
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char isbn_buf[14]; // want to hold a max of 14 so we can hold up to ISBN13s
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char options[2];
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CURLcode res;
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book_t new_book;
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if (3 != argc) {
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printf("Usage: isbn [isbn] [options]\n");
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return EXIT_FAILURE;
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}
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size_t input_len = strlen(argv[1]);
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if (!(13 == input_len || 10 == input_len)) {
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fprintf(stderr, "Invalid ISBN submitted!");
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return EXIT_FAILURE;
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}
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/**
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* We must initialize cURL
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*/
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curl_global_init(CURL_GLOBAL_ALL);
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/**
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* Grab the ISBN from argv
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*/
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snprintf(isbn_buf, 14, "%s", argv[1]);
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/**
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* Grab the formatting options from argv
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*/
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snprintf(options, 2, "%s", argv[2]);
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if (!(('w' == options[0]) || ('r' == options[0]))) {
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fprintf(stderr, "Invalid option submitted!\n");
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return EXIT_FAILURE;
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}
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/**
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* Setup the output string
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*/
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string get_output;
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init_string(&get_output);
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/**
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* Perform the get request
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*/
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res = perform_book_get(isbn_buf, &get_output);
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if (0 != res) {
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fprintf(stderr, "Failed to perform the get request!\n");
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return EXIT_FAILURE;
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}
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/**
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* Now we want to parse the JSON input
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*/
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parse_json(&get_output, isbn_buf, &new_book);
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/**
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* We need to free this string
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*/
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free(get_output.buf);
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/**
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* NOW we either print or save the book
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*/
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if (options[0] == 'w')
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write_to_file(&new_book);
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else if (options[0] == 'r')
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print_book(&new_book);
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return 0;
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}
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