From d94b024b73aeca06de417e0fd3c502495312a8b2 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sat, 7 Dec 2019 13:40:28 +0100
Subject: Added userspace libc and began userspace based shell

---
 src/kernel/lib/string/strcat.c  | 10 ++++++++++
 src/kernel/lib/string/strcati.c |  8 ++++++++
 src/kernel/lib/string/strcmp.c  | 10 ++++++++++
 src/kernel/lib/string/strcpy.c  |  9 +++++++++
 src/kernel/lib/string/strdisp.c | 12 ++++++++++++
 src/kernel/lib/string/strdup.c  | 10 ++++++++++
 src/kernel/lib/string/strinv.c  | 13 +++++++++++++
 src/kernel/lib/string/strlen.c  |  8 ++++++++
 8 files changed, 80 insertions(+)
 create mode 100644 src/kernel/lib/string/strcat.c
 create mode 100644 src/kernel/lib/string/strcati.c
 create mode 100644 src/kernel/lib/string/strcmp.c
 create mode 100644 src/kernel/lib/string/strcpy.c
 create mode 100644 src/kernel/lib/string/strdisp.c
 create mode 100644 src/kernel/lib/string/strdup.c
 create mode 100644 src/kernel/lib/string/strinv.c
 create mode 100644 src/kernel/lib/string/strlen.c

(limited to 'src/kernel/lib/string')

diff --git a/src/kernel/lib/string/strcat.c b/src/kernel/lib/string/strcat.c
new file mode 100644
index 0000000..e0d6885
--- /dev/null
+++ b/src/kernel/lib/string/strcat.c
@@ -0,0 +1,10 @@
+#include <kernel/lib/string.h>
+
+void strcat(char *dest, const char *orig)
+{
+    size_t s_dest = strlen(dest);
+    size_t s_orig = strlen(orig);
+
+    for (size_t i = 0; i < s_orig; i++) dest[s_dest + i] = orig[i];
+    dest[s_dest + s_orig] = 0;
+}
\ No newline at end of file
diff --git a/src/kernel/lib/string/strcati.c b/src/kernel/lib/string/strcati.c
new file mode 100644
index 0000000..9ee3a43
--- /dev/null
+++ b/src/kernel/lib/string/strcati.c
@@ -0,0 +1,8 @@
+#include <kernel/lib/string.h>
+
+void strcati(char *dest, const char *orig)
+{
+    size_t s_orig = strlen(orig);
+    strdisp(dest, (int) s_orig);
+    for (size_t i = 0; i < s_orig; i++) dest[i] = orig[i];
+}
\ No newline at end of file
diff --git a/src/kernel/lib/string/strcmp.c b/src/kernel/lib/string/strcmp.c
new file mode 100644
index 0000000..b8ac2a7
--- /dev/null
+++ b/src/kernel/lib/string/strcmp.c
@@ -0,0 +1,10 @@
+#include <kernel/lib/string.h>
+
+char strcmp(const char *a, const char *b)
+{
+    if (strlen(a) != strlen(b)) return 1;
+
+    for (size_t i = 0; i < strlen(a); i++) if (a[i] != b[i]) return 1;
+
+    return 0;
+}
\ No newline at end of file
diff --git a/src/kernel/lib/string/strcpy.c b/src/kernel/lib/string/strcpy.c
new file mode 100644
index 0000000..bab8535
--- /dev/null
+++ b/src/kernel/lib/string/strcpy.c
@@ -0,0 +1,9 @@
+#include <kernel/lib/string.h>
+
+void strcpy(char *dest, const char *orig)
+{
+    size_t s_orig = strlen(orig);
+
+    for (size_t i = 0; i < s_orig; i++) dest[i] = orig[i];
+    dest[s_orig] = 0;
+}
\ No newline at end of file
diff --git a/src/kernel/lib/string/strdisp.c b/src/kernel/lib/string/strdisp.c
new file mode 100644
index 0000000..36c03c3
--- /dev/null
+++ b/src/kernel/lib/string/strdisp.c
@@ -0,0 +1,12 @@
+#include <kernel/lib/string.h>
+
+void strdisponce(char *str)
+{
+    for (size_t i = sizeof(str) + 2; i > 0; i--) str[i] = str[i - 1];
+    str[0] = 0;
+}
+
+void strdisp(char *str, int n)
+{
+    for (int i = 0; i < n; i++) strdisponce(str);
+}
\ No newline at end of file
diff --git a/src/kernel/lib/string/strdup.c b/src/kernel/lib/string/strdup.c
new file mode 100644
index 0000000..9330144
--- /dev/null
+++ b/src/kernel/lib/string/strdup.c
@@ -0,0 +1,10 @@
+#include <kernel/lib/string.h>
+#include <kernel/lib/stdlib.h>
+
+char *strdup(const char *orig)
+{
+    size_t s_orig = strlen(orig);
+    char *ret = kmalloc(s_orig + 1);
+    strcpy(ret, orig);
+    return ret;
+}
\ No newline at end of file
diff --git a/src/kernel/lib/string/strinv.c b/src/kernel/lib/string/strinv.c
new file mode 100644
index 0000000..b4b4212
--- /dev/null
+++ b/src/kernel/lib/string/strinv.c
@@ -0,0 +1,13 @@
+#include <kernel/lib/string.h>
+
+void strinv(char *str)
+{
+    size_t s_str = strlen(str);
+
+    int iterations = (int) s_str / 2;
+    for (int i = 0; i < iterations; i++) {
+        char aux = str[i];
+        str[i] = str[(s_str - i) - 1];
+        str[(s_str - i) - 1] = aux;
+    }
+}
\ No newline at end of file
diff --git a/src/kernel/lib/string/strlen.c b/src/kernel/lib/string/strlen.c
new file mode 100644
index 0000000..77e3c00
--- /dev/null
+++ b/src/kernel/lib/string/strlen.c
@@ -0,0 +1,8 @@
+#include <kernel/lib/string.h>
+
+size_t strlen(const char *str)
+{
+    size_t len = 0;
+    while (str[len]) len++;
+    return len;
+}
\ No newline at end of file
-- 
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