71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
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#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 "curl.h"
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#include "json.h"
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#define MAX_BUF_LEN 1024
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void check_valid_query(cJSON* numfound)
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{
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if (0 != numfound->valueint)
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return;
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fprintf(stderr, "No ISBN found!\n");
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exit(EXIT_FAILURE);
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}
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void get_authors(cJSON* bookinfo, char authors[256])
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{
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char* temp_author;
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size_t new_len;
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cJSON* author_arr = cJSON_GetObjectItemCaseSensitive(bookinfo, "author_name")->child;
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snprintf(authors, strlen(author_arr->valuestring) + 1, "%s", author_arr->valuestring);
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author_arr = author_arr->next;
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while (NULL != author_arr) {
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// The plus 1 is for the \0, the plus 2 is for the ", "
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new_len = strlen(authors) + strlen(author_arr->valuestring) + 1 + 2;
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temp_author = malloc(sizeof(char) * new_len);
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snprintf(temp_author, new_len, "%s, %s", authors, author_arr->valuestring);
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memcpy(authors, temp_author, new_len);
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free(temp_author);
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author_arr = author_arr->next;
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}
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}
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void parse_json(string* s, char* isbn, book_t* book)
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{
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char authors[MAX_BUF_LEN];
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cJSON* json = cJSON_Parse(s->buf);
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if (NULL == json) {
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const char* error_ptr = cJSON_GetErrorPtr();
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if (NULL != error_ptr)
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fprintf(stderr, "JSON error: %s\n", error_ptr);
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cJSON_Delete(json);
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exit(EXIT_FAILURE);
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}
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check_valid_query(cJSON_GetObjectItemCaseSensitive(json, "numFound"));
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cJSON* bookinfo = cJSON_GetObjectItemCaseSensitive(json, "docs")->child;
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book->isbn = isbn;
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book->title = cJSON_GetObjectItemCaseSensitive(bookinfo, "title")->valuestring;
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book->year_of_publication = cJSON_GetObjectItemCaseSensitive(bookinfo, "first_publish_year")->valueint;
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book->page_len = cJSON_GetObjectItemCaseSensitive(bookinfo, "number_of_pages_median")->valueint;
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get_authors(bookinfo, authors);
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// Need to malloc, because we need to copy authors into the book struct
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book->authors = (char*) malloc(sizeof(char) * (strlen(authors) + 1));
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memcpy(book->authors, authors, strlen(authors) + 1);
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}
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