SuperNovaa41/isbn-lookup
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Adds better file error handling

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Creates a find id function
This commit is contained in:
SuperNovaa41 2024-01-24 11:33:50 -05:00
parent f1a6af2d35
commit 4d3dfee74c
3 changed files with 41 additions and 1 deletions
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38
src/csv.c
View File

@ -9,7 +9,7 @@
#include "json.h"
#include "csv.h"
#define MAX_BUFFER_SIZE 512
#define MAX_BUFFER_SIZE 1024
int get_next_id()
{
@ -31,6 +31,37 @@ int get_next_id()
return atoi(id) + 1;
}
long find_id(int id_to_find)
{
FILE* csv;
char* buffer;
size_t line_size = MAX_BUFFER_SIZE - 1;
int i, file_exists;
long file_pos;
file_exists = access(FILE_NAME, F_OK);
if (0 != file_exists) {
fprintf(stderr, "%s does not exist!", FILE_NAME);
exit(EXIT_FAILURE);
}
csv = fopen(FILE_NAME, "r");
if (NULL == csv) {
fprintf(stderr, "Failed to open %s!\n", FILE_NAME);
exit(EXIT_FAILURE);
}
for(i = 0; i < id_to_find + 1; i++)
getline(&buffer, &line_size, csv);
file_pos = ftell(csv);
fclose(csv);
return file_pos;
}
void write_to_file(book_t* book)
{
FILE* file;
@ -52,6 +83,11 @@ void write_to_file(book_t* book)
book_id = get_next_id();
}
if (NULL == file) {
fprintf(stderr, "Failed to open %s!\n", FILE_NAME);
exit(EXIT_FAILURE);
}
// now we write the information
fprintf(file, "%d,\"%s\",\"%s\",\"%s\",\"%s\",%d,%d\n",
book_id, book->isbn, book->title, book->authors, book->image_url, book->year_of_publication, book->page_len);

2
src/csv.h
View File

@ -7,4 +7,6 @@ int get_next_id();
void write_to_file(book_t* book);
long find_id(int id_to_find);
#endif

2
src/main.c
View File

@ -80,6 +80,8 @@ void process_args(char* argv[])
int main(int argc, char* argv[])
{
return 0;
if (1 == argc) {
printf("Not enough arguments! Try typing %s --help\n", argv[0]);
return EXIT_FAILURE;