Added the 'n' functions (ie. strNcpy) to string.h and some minor changes

include/c/_fileio.h

@@ -1,8 +1,9 @@
 #ifndef _FILEIO_H
 #define _FILEIO_H
 
-#include <stdint.h>
 #include <syscall.h>
+#include <stdlib.h>
+#include <stddef.h>
 
 // Nobody should have to interface with the internals of this structure
 typedef struct _iobuf { // 24B

include/c/stdio.h

@@ -4,6 +4,7 @@
 #include <syscall.h>
 #include <string.h>
 #include <stdlib.h>
+#include <stddef.h>
 
 /* Declarations */
 void putc(char);

include/c/string.h

@@ -3,6 +3,10 @@
 
 #include <stdint.h>
 
+void* memcpy(void* src, void* dst, uint32_t length);
+void* memcpy32(void* src, void* dst, uint32_t length);
+void* memset(void* dst, uint8_t value, uint32_t length);
+
 // Source: http://www.strudel.org.uk/itoa/
 char* itoa(uint32_t val, uint8_t base) {
     static char buf[32] = { 0 };
@@ -47,6 +51,19 @@ char* strcpy(char* str1, const char* str2) {
     return str1;
 }
 
+char* strncpy(char* str1, const char* str2, size_t n) {
+    char* dst = str1;
+    const char* src = str2;
+    while (n > 0) {
+        n--;
+        if ((*dst++ = *src++) == '\0') {
+            memset(dst, '\0', n);
+            break;
+        }
+    }
+    return str1;
+}
+
 char* strcat(char* str1, const char* str2) {
     char* s = str1;
     while (*s != '\0') { s++; }
@@ -54,12 +71,21 @@ char* strcat(char* str1, const char* str2) {
     return str1;
 }
 
+char* strncat(char* str1, const char* str2, size_t n) {
+    char* s = str1;
+    while (*s != '\0') { s++; }
+    strncpy(s, str2, n);
+    return str1;
+}
+
 char* strchr(const char* str, char c) {
     const char* s = str;
     while (*s != '\0' && *s != c) { s++; }
     return (*s == c) ? (char*)s : NULL;
 }
 
+// char* strrchr(const char* str, char c);
+
 int strcmp(const char* str1, const char* str2) {
     while (*str1 != '\0' && *str1 == *str2) {
         str1++;
@@ -72,6 +98,20 @@ int strcmp(const char* str1, const char* str2) {
     return ((c1 < c2) ? -1 : (c1 > c2));
 }
 
+int strncmp(const char* str1, const char* str2, size_t n) {
+    if (n == 0) { return 0; }
+    while (n-- > 0 && *str1 == *str2) {
+        if (n == 0 || *str1 == '\0') { return 0; }
+        str1++;
+        str2++;
+    }
+
+    uint8_t c1 = (*(uint8_t*)str1);
+    uint8_t c2 = (*(uint8_t*)str2);
+
+    return ((c1 < c2) ? -1 : (c1 > c2));
+}
+
 uint32_t strlen(const char* str) {
     const char* p = str;
     while (*++p != '\0');