Get book id from isbn

1 files changed, 40 insertions, 10 deletions

diff --git a/getgbook.c b/getgbook.c
index 7858008..98e1b0b 100644
--- a/getgbook.c
+++ b/getgbook.c
@@ -7,32 +7,62 @@
 #include <string.h>
 #include "util.c"
 
-#define usage "getgbook bookid"
+#define usage "getgbook isbn"
 
 #define hostname "books.google.com"
 
+#define URLMAX 1024
+#define BOOKID_LEN 12
+
+char *getgbookid(char *isbn)
+{
+	char url[URLMAX];
+	int i;
+	FILE *srv;
+	char *buf, *bookid, *c;
+
+	i = dial("books.google.com", "80");
+	srv = fdopen(i, "r+");
+
+	/* NOTE: new api returns json, and looks like this:
+	 * http://www.googleapis.com/books/v1/volumes?q=isbn:1589235126
+	 * (this needs https, which we don't yet support) */
+
+	snprintf(url, URLMAX, "/books/feeds/volumes?q=isbn:%s", isbn);
+
+	bookid = malloc(sizeof(char *) * BOOKID_LEN);
+	if((buf = get(srv, "books.google.com", url)) == NULL)
+		fprintf(stderr,"Error downloading page\n");
+	else {
+		c = strstr(buf,"<dc:identifier>");
+		strncpy(bookid, c+15, BOOKID_LEN);
+		bookid[BOOKID_LEN] = '\0';
+		free(buf);
+	}
+
+	return bookid;
+}
+
 int main(int argc, char *argv[])
 {
 	int i, s;
-	char *bookid, url[80];
+	char *bookid, url[80], isbn[16];
 	char *curpage;
 	FILE *srv;
 
 	if(argc != 2)
 		die("usage: " usage "\n");
 
-	bookid = argv[1];
+	strncpy(isbn,argv[1],16);
 
 	i = dial(hostname, "80");
 	srv = fdopen(i, "r+");
 
-	snprintf(url, 80, "/books?id=%s&pg=%s&jscmd=click3", bookid, "PA1");
-	if((curpage = get(srv, hostname, url)) == NULL)
-		fprintf(stderr,"Error downloading page\n");
-	else {
-		fputs(curpage,stdout);
-		free(curpage);
-	}
+	/* get google book id */
+	bookid = getgbookid(isbn);
+
+	printf("bookid is %s\n", bookid);
 
+	free(bookid);
 	return 0;
 }