added Makefile

1 files changed, 232 insertions, 0 deletions

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..0ea1b99
--- /dev/null
+++ b/main.c
@@ -0,0 +1,232 @@
+#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;
+}