init(core): add core

src/core/shoppyou.c

@@ -0,0 +1,152 @@
+#include <malloc.h>
+#include <string.h>
+#include <time.h>
+
+#include "../../include/core.h"
+
+int shoppyou_init(Shoppyou *shoppyou) {
+    uint64_t timestamp = time(NULL);
+    shoppyou->created_ts = timestamp;
+    shoppyou->modified_ts = timestamp;
+    shoppyou->size = 0;
+    shoppyou->removed_cnt = 0;
+    shoppyou->contents = NULL;
+    shoppyou->file = NULL;
+
+    return 0;
+}
+
+int shoppyou_free(Shoppyou *shoppyou) {
+    free(shoppyou->contents);
+    if (shoppyou->file != NULL) {
+        fclose(shoppyou->file);
+    }
+
+    return 0;
+}
+
+int shoppyou_weed(Shoppyou *shoppyou) {
+    if (shoppyou->removed_cnt == 0) {
+        return 0;
+    }
+    uint64_t weeded_size = shoppyou->size - shoppyou->removed_cnt;
+    for (uint64_t i = 0, count = 0; i < shoppyou->size; i++) {
+        if (shoppyou->contents[i].sasa_id != 0 || shoppyou->contents[i].tanzaku_id != 0) {
+            shoppyou->contents[i - count] = shoppyou->contents[i];
+        } else {
+            count++;
+        }
+    }
+    shoppyou->size = weeded_size;
+    shoppyou->removed_cnt = 0;
+    shoppyou->contents = realloc(shoppyou->contents, shoppyou->size * sizeof(Kazari));
+
+    return 0;
+}
+
+int shoppyou_load(Shoppyou *shoppyou) {
+    if (shoppyou->file == NULL) {
+        fprintf(stderr, "Failed to load shoppyou: file not specified\n");
+        return 1;
+    }
+    uint16_t signature[4];
+    rewind(shoppyou->file);
+    fread(signature, 2, 4, shoppyou->file);
+    if (memcmp(signature, SHOPPYOU_SIG, 8) != 0) {
+        fprintf(stderr, "Failed to load shoppyou: invalid signature\n");
+        return 1;
+    }
+    fread(&shoppyou->created_ts, 8, 1, shoppyou->file);
+    fread(&shoppyou->modified_ts, 8, 1, shoppyou->file);
+    fread(&shoppyou->size, 8, 1, shoppyou->file);
+    shoppyou->removed_cnt = 0;
+    shoppyou->contents = malloc(shoppyou->size * sizeof(Kazari));
+    for (uint64_t i = 0; i < shoppyou->size; i++) {
+        fread(&shoppyou->contents[i].created_ts, 8, 1, shoppyou->file);
+        fread(&shoppyou->contents[i].sasa_id, 8, 1, shoppyou->file);
+        fread(&shoppyou->contents[i].tanzaku_id, 8, 1, shoppyou->file);
+    }
+
+    return 0;
+}
+
+int shoppyou_save(Shoppyou *shoppyou) {
+    if (shoppyou->file == NULL) {
+        fprintf(stderr, "Failed to save shoppyou: file not specified\n");
+        return 1;
+    }
+    if (shoppyou_weed(shoppyou) != 0) {
+        fprintf(stderr, "Failed to save shoppyou: failed to weed sappyou\n");
+        return 1;
+    }
+    rewind(shoppyou->file);
+    fwrite(SHOPPYOU_SIG, 2, 4, shoppyou->file);
+    fwrite(&shoppyou->created_ts, 8, 1, shoppyou->file);
+    fwrite(&shoppyou->modified_ts, 8, 1, shoppyou->file);
+    fwrite(&shoppyou->size, 8, 1, shoppyou->file);
+    fflush(shoppyou->file);
+    for (uint64_t i = 0; i < shoppyou->size; i++) {
+        fwrite(&shoppyou->contents[i].created_ts, 8, 1, shoppyou->file);
+        fwrite(&shoppyou->contents[i].sasa_id, 8, 1, shoppyou->file);
+        fwrite(&shoppyou->contents[i].tanzaku_id, 8, 1, shoppyou->file);
+    }
+    fflush(shoppyou->file);
+
+    return 0;
+}
+
+int shoppyou_open(Shoppyou *shoppyou, const char *path) {
+    shoppyou->file = fopen(path, "r+b");
+    if (shoppyou->file == NULL) {
+        fprintf(stderr, "Failed to dump shoppyou: failed to open file '%s'\n", path);
+        return 1;
+    }
+    return shoppyou_load(shoppyou);
+}
+
+int shoppyou_dump(Shoppyou *shoppyou, const char *path) {
+    shoppyou->file = fopen(path, "w+b");
+    if (shoppyou->file == NULL) {
+        fprintf(stderr, "Failed to dump shoppyou: failed to open file '%s'\n", path);
+        return 1;
+    }
+    return shoppyou_save(shoppyou);
+}
+
+int kazari_add(Shoppyou *shoppyou, uint64_t sasa_id, uint64_t tanzaku_id) {
+    if (shoppyou->size == -1) {
+        fprintf(stderr, "Failed to add kazari: shoppyou is full\n");
+        return 1;
+    }
+    for (uint64_t i = 0; i < shoppyou->size; i++) {
+        if (shoppyou->contents[i].sasa_id == sasa_id && shoppyou->contents[i].tanzaku_id == tanzaku_id) {
+            fprintf(stderr, "Failed to add kazari: kazari with sasa_id=%lu and tanzaku_id=%lu already exists\n",
+                    sasa_id, tanzaku_id);
+            return 1;
+        }
+    }
+    Kazari newbie;
+    newbie.created_ts = time(NULL);
+    newbie.sasa_id = sasa_id;
+    newbie.tanzaku_id = tanzaku_id;
+    shoppyou->size++;
+    shoppyou->contents = realloc(shoppyou->contents, shoppyou->size * sizeof(Kazari));
+    shoppyou->contents[shoppyou->size - 1] = newbie;
+    shoppyou->modified_ts = newbie.created_ts;
+
+    return 0;
+}
+
+int kazari_rem(Shoppyou *shoppyou, uint64_t sasa_id, uint64_t tanzaku_id) {
+    for (uint64_t i = 0; i < shoppyou->size; i++) {
+        if (shoppyou->contents[i].sasa_id == sasa_id && shoppyou->contents[i].tanzaku_id == tanzaku_id) {
+            shoppyou->modified_ts = time(NULL);
+            shoppyou->contents[i].sasa_id = 0;
+            shoppyou->contents[i].tanzaku_id = 0;
+            shoppyou->removed_cnt++;
+            return 0;
+        }
+    }
+    fprintf(stderr, "Failed to remove kazari: target kazari does not exist or is already removed\n");
+    return 1;
+}