major backup 8.24.21

1 files changed, 15 insertions, 4 deletions

diff --git a/src/kernel/libc.c b/src/kernel/libc.c
index c786cd0..4278281 100644
--- a/src/kernel/libc.c
+++ b/src/kernel/libc.c
@@ -3,7 +3,7 @@
 // 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++) {
+  for(i = 0; ((i < (n - 1)) && (s1[i] != '\0') && (s2[i] != '\0')); i++) {
     if(s1[i] != s2[i]) {
       return(s1[i] - s2[i]);
     }
@@ -11,6 +11,13 @@ int strncmp(const char *s1, const char *s2, unsigned int n) {
   return(s1[i] - s2[i]);
 }
 
+//this one hasn't been tested
+size_t strlen(const char *s) {
+  size_t len = 0;
+  while(s[len + 1] != '\0') len++;
+  return(len);
+}
+
 int strcmp(const char *s1, const char *s2) {
   int i;
   for(i = 0; ((s1[i] != '\0') && (s2[i] != '\0')); i++) {
@@ -25,7 +32,7 @@ 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++) {
+  for(i = 0; i < n - 1; i++) {
     if(p1[i] != p2[i]) {
       return(p1[i] - p2[i]);
     }
@@ -41,7 +48,7 @@ void strcpy(char *dest, char *src) {
 
 void *memcpy(void *dest, char *src, size_t n) {
   char *p = dest;
-  for(unsigned int i = 0; i <= n; i++) {
+  for(unsigned int i = 0; i < n; i++) {
     p[i] = src[i];
   }
   return(dest);
@@ -56,12 +63,16 @@ void *bzero(void *dest, size_t size) {
 }
 
 //TODO move this function to a seperate math library
-unsigned int ceil(double n) {
+int ceil(double n) {
   int low_n = (int)n;
   if(n == (double)low_n) return(low_n);
   return(low_n + 1);
 }
 
+int round(double n) {
+  return(int)(n + 0.5);
+}
+
 void *memset(void *s, char c, size_t n) {
   char *p = s;
   for(size_t i = 0; i < n; i++) {