1 files changed, 222 insertions, 0 deletions
diff --git a/user/include/stdlib.h b/user/include/stdlib.h
new file mode 100644
index 0000000..40bffde
--- /dev/null
+++ b/user/include/stdlib.h
@@ -0,0 +1,222 @@
+/**
+ * @file stdlib.h
+ *
+ * @author Freya Murphy <freya@freyacat.org>
+ *
+ * Standard libaray functions
+ */
+
+#ifndef _STDLIB_H
+#define _STDLIB_H
+
+#include <stddef.h>
+
+/**
+ * converts single digit int to base 36
+ * @param i - int
+ * @returns c - base 36 char
+ */
+extern char itoc(int i);
+
+/**
+ * converts single base 36 chat into int
+ * @param c - base 36 char
+ * @returns i - int, or -1 if the char was invalid
+ */
+extern int ctoi(char c);
+
+/**
+ * Converts the initial portiion of the string pointed to by s to int.
+ * @param s - the string to convert
+ * @returns the number inside s or 0 on error
+ */
+extern int atoi(const char *s);
+
+/**
+ * Converts the initial portiion of the string pointed to by s to long.
+ * @param s - the string to convert
+ * @returns the number inside s or 0 on error
+ */
+extern long int atol(const char *s);
+
+/**
+ * Converts the initial portiion of the string pointed to by s to long long.
+ * @param s - the string to convert
+ * @returns the number inside s or 0 on error
+ */
+extern long long int atoll(const char *s);
+
+/**
+ * Converts a integer to asci inside a string with a given radix (base).
+ * @param n - the number to convert
+ * @param buffer - the string buffer
+ * @param radix - the base to convert
+ */
+extern char *itoa(int n, char *buffer, int radix);
+
+/**
+ * Converts a long to asci inside a string with a given radix (base).
+ * @param n - the number to convert
+ * @param buffer - the string buffer
+ * @param radix - the base to convert
+ */
+extern char *ltoa(long int n, char *buffer, int radix);
+
+/**
+ * Converts a long long to asci inside a string with a given radix (base).
+ * @param n - the number to conver
+ * @param buffer - the string buffer
+ * @param radix - the base to convert
+ */
+extern char *lltoa(long long int n, char *buffer, int radix);
+
+/**
+ * Converts a unsigned integer to asci inside a string with a given radix (base).
+ * @param n - the number to convert
+ * @param buffer - the string buffer
+ * @param radix - the base to convert
+ */
+extern char *utoa(unsigned int n, char *buffer, int radix);
+
+/**
+ * Converts a unsigned long to asci inside a string with a given radix (base).
+ * @param n - the number to convert
+ * @param buffer - the string buffer
+ * @param radix - the base to convert
+ */
+extern char *ultoa(unsigned long int n, char *buffer, int radix);
+
+/**
+ * Converts a unsigned long long to asci inside a string with a given radix (base).
+ * @param n - the number to conver
+ * @param buffer - the string buffer
+ * @param radix - the base to convert
+ */
+extern char *ulltoa(unsigned long long int n, char *buffer, int radix);
+
+/**
+ * Converts the string in str to an int value based on the given base.
+ * The endptr is updated to where the string was no longer valid.
+ * @param str - the string buffer
+ * @param endptr - the endptr
+ * @param base - the base to convert to
+ * @returns 0 on error or success, error if endptr is still equal to str
+ */
+extern int strtoi(const char *str, char **endptr, int base);
+
+/**
+ * Converts the string in str to a long value based on the given base.
+ * The endptr is updated to where the string was no longer valid.
+ * @param str - the string buffer
+ * @param endptr - the endptr
+ * @param base - the base to convert to
+ * @returns 0 on error or success, error if endptr is still equal to str
+ */
+extern long int strtol(const char *str, char **endptr, int base);
+
+/**
+ * Converts the string in str to a long long value based on the given base.
+ * The endptr is updated to where the string was no longer valid.
+ * @param str - the string buffer
+ * @param endptr - the endptr
+ * @param base - the base to convert to
+ * @returns 0 on error or success, error if endptr is still equal to str
+ */
+extern long long int strtoll(const char *str, char **endptr, int base);
+
+/**
+ * Converts the string in str to an unsigned int value based on the given base.
+ * The endptr is updated to where the string was no longer valid.
+ * @param str - the string buffer
+ * @param endptr - the endptr
+ * @param base - the base to convert to
+ * @returns 0 on error or success, error if endptr is still equal to str
+ */
+extern unsigned int strtoui(const char *str, char **endptr, int base);
+
+/**
+ * Converts the string in str to an unsigned long value based on the given base.
+ * The endptr is updated to where the string was no longer valid.
+ * @param str - the string buffer
+ * @param endptr - the endptr
+ * @param base - the base to convert to
+ * @returns 0 on error or success, error if endptr is still equal to str
+ */
+extern unsigned long int strtoul(const char *str, char **endptr, int base);
+
+/**
+ * Converts the string in str to an unsigned long long value based on the given base.
+ * The endptr is updated to where the string was no longer valid.
+ * @param str - the string buffer
+ * @param endptr - the endptr
+ * @param base - the base to convert to
+ * @returns 0 on error or success, error if endptr is still equal to str
+ */
+extern unsigned long long int strtoull(const char *str, char **endptr,
+									   int base);
+
+/**
+ * Converts a byte count to a human readable file size of at most four characters
+ * using binary suffixes.
+ *
+ * The following rules are applied:
+ * - If the byte count is less than 1024, the count is written in decimal
+ *   and no suffix is applied
+ * - Otherwise, repeatedly divide by 1024 until the value is under 1000.
+ * - If the value has two or three decimal digits, print it followed by the
+ *   approprate suffix.
+ * - If the value has one decimal digit, print it along with a single fractional
+ *   digit. This also applies if the value is zero.
+ *
+ * @param bytes - the bytes to convert
+ * @param buf - a pointer to the buffer to store it in (which must be at least five
+ *              bytes long)
+ * @returns - buf
+ */
+extern char *btoa(size_t bytes, char *buf);
+
+/**
+ * This function confines an argument within specified bounds.
+ *
+ * @param min - lower bound
+ * @param value - value to be constrained
+ * @param max - upper bound
+ *
+ * @returns the constrained value
+ */
+extern unsigned int bound(unsigned int min, unsigned int value,
+						  unsigned int max);
+
+/**
+ * Delays the current process by spining the cpu
+ *
+ * @param count how longish to spin
+ */
+extern void delay(int count);
+
+/**
+ * Allocates size_t bytes in memory
+ *
+ * @param size - the amount of bytes to allocate
+ * @returns the address allocated or NULL on failure
+ */
+extern void *malloc(size_t size);
+
+/**
+ * Rellocates a given allocated ptr to a new size of bytes in memory.
+ * If ptr is NULL it will allocate new memory.
+ *
+ * @param ptr - the pointer to reallocate
+ * @param size - the amount of bytes to reallocate to
+ * @returns the address allocated or NULL on failure
+ */
+extern void *realloc(void *ptr, size_t size);
+
+/**
+ * Frees an allocated pointer in memory
+ *
+ * @param ptr - the pointer to free
+ */
+extern void free(void *ptr);
+
+#endif /* stlib.h */