Added libc functionalities

components/libc/include/ctype.h

@@ -0,0 +1,41 @@
+#ifndef __CTYPE_H
+#define __CTYPE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int iscntrl(int c);
+
+int isblank(int c);
+
+int isspace(int c);
+
+int isupper(int c);
+
+int islower(int c);
+
+int isalpha(int c);
+
+int isdigit(int c);
+
+int isxdigit(int c);
+
+int isalnum(int c);
+
+int ispunct(int c);
+
+int isgraph(int c);
+
+int isprint(int c);
+
+int tolower(int c);
+
+int toupper(int c);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __CTYPE_H */
+

components/libc/include/stdio.h

@@ -3,12 +3,15 @@
 
 #include <stdarg.h>
 #include <stddef.h>
-#include "hal_sys_uart.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+int putchar(int c);
+
+int puts(const char *str);
+
 /**
  * @brief Formatted output to stdout
  * @param fmt Format string

components/libc/include/stdlib.h

@@ -0,0 +1,49 @@
+#ifndef __STDLIB_H
+#define __STDLIB_H
+
+#include <stddef.h>
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+    void* start;
+    void* end;
+} area_t;
+
+extern const area_t heap;
+
+__attribute__ ((__noreturn__))
+void halt(int code);
+
+#ifndef NULL
+#define NULL 0
+#endif
+
+#define RAND_MAX 0x7fffffff;
+
+void srand(unsigned int seed);
+
+int rand(void);
+
+void *malloc(size_t size);
+
+void free(void *ptr);
+
+int abs(int x);
+
+int atoi(const char *nptr);
+
+__attribute__ ((__noreturn__))
+void exit(int code);
+
+__attribute__ ((__noreturn__))
+void abort(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STDLIB_H */

components/libc/include/string.h

@@ -33,7 +33,7 @@ void* memset(void* s, int c, size_t n);
  */
 size_t strlen(const char* s);
 
-size_t memcmp(const void* ptr1, const void* ptr2, size_t num);
+int memcmp(const void* ptr1, const void* ptr2, size_t num);
 
 char* strchr(const char* str, int c);
 

components/libc/src/ctype.c

@@ -0,0 +1,68 @@
+#include "ctype.h"
+
+int iscntrl(int c) {
+    return (c >= '\0' && c <= '\x1f') || (c == '\x7f');
+}
+
+int isblank(int c) {
+    return (c == '\t' || c == ' ');
+}
+
+int isspace(int c) {
+    return (c == ' ' || (c >= '\t' && c <= '\r'));
+}
+
+int isupper(int c) {
+    return (c >= 'A' && c <= 'Z');
+}
+
+int islower(int c) {
+    return (c >= 'a' && c <= 'z');
+}
+
+int isalpha(int c) {
+    return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
+}
+
+int isdigit(int c) {
+    return (c >= '0' && c <= '9');
+}
+
+int isxdigit(int c) {
+    return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f');
+}
+
+int isalnum(int c) {
+    return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
+}
+
+int ispunct(int c) {
+    return (c >= '!' && c <= '/') || 
+           (c >= ':' && c <= '@') || 
+           (c >= '[' && c <= '`') || 
+           (c >= '{' && c <= '~');
+}
+
+int isgraph(int c) {
+    return (c >= '!' && c <= '~');
+}
+
+int isprint(int c) {
+    return (c >= ' ' && c <= '~');
+}
+
+int tolower(int c) {
+    if (isupper(c)) {
+        return c - 'A' + 'a';
+    } else {
+        return c;
+    }
+}
+
+int toupper(int c) {
+    if (islower(c)) {
+        return c - 'a' + 'A';
+    } else {
+        return c;
+    }
+}