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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
const char *filename = "./anime.csv";
typedef struct {
char name[80];
char episode[5];
} entry_t;
typedef enum {
MATCH_MODE,
SEARCH_MODE,
APPEND_MODE,
EDIT_MODE,
PRINT_MODE
} mode_e;
void print_help()
{
printf("usage: myal [-s <name>] [-ae <name> <episode>] \n");
printf(" Prints all entries by default \n");
printf(" -m <name> Prints all anime containing the given string \n");
printf(" -s <name> Search for a specific anime by name \n");
printf(" -a <name> <number> Append new anime and episode to file \n");
printf(" -e <name> <number> Edit the episode number of an anime \n");
printf("\n");
}
char *getfield(char *line, int num)
{
char *tok;
for (tok = strtok(line, ","); tok && *tok; tok = strtok(NULL, ",")) {
if (!--num) {
return tok;
}
}
return NULL;
}
// print everything
void print_all()
{
FILE *fp = fopen(filename, "r");
if (fp == NULL) {
fprintf(stderr, "ERROR: no such file\n");
exit(EXIT_FAILURE);
}
char line[100];
while (fgets(line, sizeof(line), fp)) {
char *tmp = strdup(line);
char *name = getfield(tmp, 1);
tmp = strdup(line);
char *episode = getfield(tmp, 2);
printf("Name: %s Episode: %s", name, episode);
free(tmp);
}
fclose(fp);
}
// print any entry containing the search string
void print_matches(const char *sel)
{
FILE *fp = fopen(filename, "r");
if (fp == NULL) {
fprintf(stderr, "ERROR: no such file\n");
exit(EXIT_FAILURE);
}
char line[100];
while (fgets(line, sizeof(line), fp)) {
char *tmp = strdup(line);
char *name = getfield(tmp, 1);
tmp = strdup(line);
char *episode = getfield(tmp, 2);
if (strcasestr(name, sel) != NULL) {
printf("Name: %s Episode: %s", name, episode);
}
free(tmp);
}
fclose(fp);
}
// return one single entry matching the search string from the first character
entry_t *get_entry(const char *sel)
{
FILE *fp = fopen(filename, "r");
if (fp == NULL) {
fprintf(stderr, "ERROR: no such file\n");
exit(EXIT_FAILURE);
}
entry_t *res = malloc(sizeof(entry_t));
char line[100];
while (fgets(line, sizeof(line), fp)) {
char *tmp = strdup(line);
char *name = getfield(tmp, 1);
tmp = strdup(line);
char *episode = getfield(tmp, 2);
if (strncasecmp(name, sel, strlen(sel)) == 0) {
strcpy(res->name, name);
strcpy(res->episode, episode);
break;
}
free(tmp);
}
fclose(fp);
return res;
}
// append new entry to the end of the csv
void append_entry(const char *name, const char *ep)
{
FILE *fp = fopen(filename, "a");
if (fp == NULL) {
fprintf(stderr, "ERROR: no such file\n");
exit(EXIT_FAILURE);
}
entry_t *entry = malloc(sizeof(entry_t));
strncpy(entry->name, name, sizeof(entry->name));
strncpy(entry->episode, ep, sizeof(entry->episode));
fprintf(fp, "%s,%s\n", entry->name, entry->episode);
}
// edit the episode number of an anime
void edit_entry(const char *name, const char *new_ep)
{
FILE *fp_old = fopen(filename, "r");
FILE *fp_new = fopen("temp.csv", "w");
if (fp_old == NULL || fp_new == NULL) {
fprintf(stderr, "ERROR: no such file\n");
exit(EXIT_FAILURE);
}
char line[100];
while (fgets(line, sizeof(line), fp_old)) {
char *tmp = strdup(line);
char *old_name = getfield(tmp, 1);
tmp = strdup(line);
char *old_ep = getfield(tmp, 2);
if (strcasestr(old_name, name) != NULL) {
fprintf(fp_new, "%s,%s\n", old_name, new_ep);
} else {
fprintf(fp_new, "%s,%s", old_name, old_ep);
}
free(tmp);
}
remove(filename);
rename("temp.csv", filename);
fclose(fp_old);
fclose(fp_new);
}
int main(int argc, char **argv)
{
mode_e mode = PRINT_MODE;
int opt;
entry_t *entry;
while ((opt = getopt(argc, argv, "msae")) != -1) {
switch (opt) {
case 'm': mode = MATCH_MODE; break;
case 's': mode = SEARCH_MODE; break;
case 'a': mode = APPEND_MODE; break;
case 'e': mode = EDIT_MODE; break;
default:
print_help();
exit(EXIT_FAILURE);
}
}
if (optind >= argc && mode != PRINT_MODE) {
fprintf(stderr, "ERROR: missing argument\n");
print_help();
exit(EXIT_FAILURE);
}
if (optind == 1 && argc == 2) {
fprintf(stderr, "ERROR: no option for argument given\n");
print_help();
exit(EXIT_FAILURE);
}
switch (mode) {
case MATCH_MODE:
print_matches(argv[optind]);
break;
case SEARCH_MODE:
// maybe useful for sanitizing input, but not needed for now
//
// size_t buffer_size = strlen(argv[optind]) + 1;
// char *selection = (char*)malloc(buffer_size);
// if (selection == NULL) {
// fprintf(stderr, "ERROR: failed to allocate memory for buffer\n");
// exit(EXIT_FAILURE);
// }
// strncpy(selection, argv[optind], buffer_size - 1);
// selection[buffer_size - 1] = '\0';
// [...]
// free(selection);
entry = get_entry(argv[optind]);
if (entry->name[0] == '\0') {
printf("Entry not found\n");
break;
}
printf("Name: %s Episode: %s", entry->name, entry->episode);
break;
case APPEND_MODE:
append_entry(argv[optind], argv[optind+1]);
break;
case EDIT_MODE:
edit_entry(argv[optind], argv[optind+1]);
break;
case PRINT_MODE:
print_all();
break;
default:
print_help();
break;
}
return 0;
}
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