From f90c075d5061b3a89316d6bf3d5b190d49049ccd Mon Sep 17 00:00:00 2001
From: Brett Weiland <brett_weiland@bpcspace.com>
Date: Wed, 24 Mar 2021 15:42:20 -0500
Subject: 	renamed:    kernel/include/acpi.h -> include/acpi.h 
 renamed:    kernel/include/libc.h -> include/libc.h 	renamed:   
 kernel/include/paging.h -> include/paging.h 	renamed:   
 kernel/include/printf.h -> include/printf.h 	renamed:   
 kernel/include/serial.h -> include/serial.h 	renamed:   
 kernel/include/video.h -> include/video.h 	new file:   indigo_os 
 renamed:    kernel/libs/acpi.c -> kernel/acpi.c 	renamed:   
 kernel/libs/drivers/serial.c -> kernel/drivers/serial.c 	renamed:   
 kernel/libs/drivers/video.c -> kernel/drivers/video.c 	renamed:   
 kernel/libs/libc.c -> kernel/libc.c 	renamed:    kernel/libs/page.c ->
 kernel/page.c 	renamed:    kernel/libs/printf.c -> kernel/printf.c 
 renamed:    kernel/libs/printf.h -> kernel/printf.h 	modified:   makefile

---
 src/kernel/libc.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 src/kernel/libc.c

(limited to 'src/kernel/libc.c')

diff --git a/src/kernel/libc.c b/src/kernel/libc.c
new file mode 100644
index 0000000..dc5c0ac
--- /dev/null
+++ b/src/kernel/libc.c
@@ -0,0 +1,60 @@
+#include <stddef.h>
+#include <stdint.h>
+// TODO clean up variable names
+int strncmp(const char *s1, const char *s2, unsigned int n) {
+  int i;
+  for(i = 0; ((i <= n) && (s1[i] != '\0') && (s2[i] != '\0')); i++) {
+    if(s1[i] != s2[i]) {
+      return(s1[i] - s2[i]);
+    }
+  }
+  return(s1[i] - s2[i]);
+}
+
+int strcmp(const char *s1, const char *s2) {
+  int i;
+  for(i = 0; ((s1[i] != '\0') && (s2[i] != '\0')); i++) {
+    if(s1[i] != s2[i]) {
+      return(s1[i] - s2[i]);
+    }
+  }
+  return(s1[i] - s2[i]);
+}
+
+int memcmp(const void *s1, const void *s2, size_t n) {
+  const unsigned char *p1 = s1;
+  const unsigned char *p2 = s2;
+  int i;
+  for(i = 0; i < n; i++) {
+    if(p1[i] != p2[i]) {
+      return(p1[i] - p2[i]);
+    }
+  }
+  return(p1[n-1] - p2[n-1]);
+}
+
+void strcpy(char *dest, char *src) {
+  for(unsigned int i = 0; src[i] != '\0'; i++){
+    dest[i] = src[i];
+  }
+}
+
+void memcpy(char *dest, char *src, size_t n) {
+  for(unsigned int i = 0; i <= n; i++) {
+    dest[i] = src[i];
+  }
+}
+
+void bzero(void *dest, size_t size) {
+  unsigned char *p1 = dest;
+  for(uint64_t i = 0; i < size; i++) {
+    p1[i] = 0;
+  }
+}
+
+//TODO move this function to a seperate math library
+int ceil(float n) {
+  int low_n = (int)n;
+  if(n == (float)low_n) return(low_n);
+  return(low_n + 1);
+}
-- 
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