From 9ed0c06de64b7bd6f5390c4f5972ac0578c0f858 Mon Sep 17 00:00:00 2001
From: haturatu <taro@eyes4you.org>
Date: Thu, 12 Dec 2024 19:39:56 +0900
Subject: wip

---
 a         | Bin 0 -> 15656 bytes
 memchr.c  |  16 ++++++++++++++++
 memcmp.c  |  15 +++++++++++++++
 memcpy.c  |  15 +++++++++++++++
 memmove.c |  19 +++++++++++++++++++
 5 files changed, 65 insertions(+)
 create mode 100755 a
 create mode 100644 memchr.c
 create mode 100644 memcmp.c
 create mode 100644 memcpy.c
 create mode 100644 memmove.c

diff --git a/a b/a
new file mode 100755
index 0000000..c3ca5c3
Binary files /dev/null and b/a differ
diff --git a/memchr.c b/memchr.c
new file mode 100644
index 0000000..ec05235
--- /dev/null
+++ b/memchr.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+  char *ptr;
+  char str[] = "test";
+
+  ptr = memchr(str ,'s', strlen(str));
+  if (ptr != NULL) {
+    printf("文字「s」の場所: %ld\n", ptr - str + 1);
+  } else {
+    printf("文字「s」は見つかりませんでした。\n");
+  }
+  // => 文字「s」の場所: 3
+}
diff --git a/memcmp.c b/memcmp.c
new file mode 100644
index 0000000..e9ad5b7
--- /dev/null
+++ b/memcmp.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+  char str1[5] = "test";
+  char str2[5] = {'t', 'e', 's', 't', '\0'};
+
+  if (memcmp(str1, str2, 5*sizeof(char)) == 0) {
+    printf("str1とstr2は同じです。\n");
+  } else {
+    printf("str1とstr2は異なります。\n");
+  }
+  // => str1とstr2は同じです。
+}
diff --git a/memcpy.c b/memcpy.c
new file mode 100644
index 0000000..2131ef6
--- /dev/null
+++ b/memcpy.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+  char str1[10] = "Hi johnny";
+  char str2[10] = {0};
+  if (memcpy(str2, str1, strlen(str1))) {
+    printf("コピー元: %s\nコピー先: %s\n", str1, str2);
+    // コピー元: Hi johnny
+    // コピー先: Hi johnny
+  } else {
+    fprintf(stderr, "Error while coping str1 into str2.\n");
+  }
+}
diff --git a/memmove.c b/memmove.c
new file mode 100644
index 0000000..f766ad0
--- /dev/null
+++ b/memmove.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+  char str[20] = "abc,def";
+
+  printf("memmove()実行前\n");
+  printf("%s\n", str);
+  /// => abc,def
+
+  if (memmove(str+4, str, strlen(str))) {
+    printf("memmove()実行後\n");
+    printf("%s\n", str);
+    // => abc,abc,def
+  } else {
+    fprintf(stderr, "エラー発生\n");
+  }
+}
-- 
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