556 lines
20 KiB
C
556 lines
20 KiB
C
#include "alloc.h"
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#include "klibc.h"
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#include "serial.h"
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#include "vga.h"
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int memcmp(const void *aptr, const void *bptr, size_t size)
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{
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const unsigned char *a = (const unsigned char *)aptr;
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const unsigned char *b = (const unsigned char *)bptr;
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for (size_t i = 0; i < size; i++) {
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if (a[i] < b[i])
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return -1;
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else if (b[i] < a[i])
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return 1;
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}
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return 0;
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}
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// Inspirated by https://interrupt.memfault.com/blog/memcpy-newlib-nano
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/* Nonzero if either X or Y is not aligned on a "long" boundary. */
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#define UNALIGNED(X, Y) \
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(((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1)))
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/* How many bytes are copied each iteration of the 4X unrolled loop. */
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#define BIGBLOCKSIZE (sizeof (long) << 2)
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/* How many bytes are copied each iteration of the word copy loop. */
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#define LITTLEBLOCKSIZE (sizeof (long))
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/* Threshold for punting to the byte copier. */
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#define TOO_SMALL(LEN) ((LEN) < BIGBLOCKSIZE)
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void *memcpy(void *dst0, const void *src0, size_t len0)
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{
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#if 0
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char *dstChar = dst0;
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const char *srcChar = src0;
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for (size_t i = 0; i < len0; i++) {
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*(dstChar++) = *(srcChar++);
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}
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return dst0;
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#else
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char *dst = dst0;
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const char *src = src0;
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long *aligned_dst;
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const long *aligned_src;
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/* If the size is small, or either SRC or DST is unaligned,
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then punt into the byte copy loop. This should be rare. */
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if (!TOO_SMALL(len0) && !UNALIGNED(src, dst)) {
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aligned_dst = (long *)dst;
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aligned_src = (long *)src;
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/* Copy 4X long words at a time if possible. */
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while (len0 >= BIGBLOCKSIZE) {
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*aligned_dst++ = *aligned_src++;
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*aligned_dst++ = *aligned_src++;
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*aligned_dst++ = *aligned_src++;
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*aligned_dst++ = *aligned_src++;
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len0 -= BIGBLOCKSIZE;
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}
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/* Copy one long word at a time if possible. */
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while (len0 >= LITTLEBLOCKSIZE) {
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*aligned_dst++ = *aligned_src++;
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len0 -= LITTLEBLOCKSIZE;
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}
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/* Pick up any residual with a byte copier. */
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dst = (char *)aligned_dst;
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src = (char *)aligned_src;
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}
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while (len0--)
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*dst++ = *src++;
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return dst0;
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#endif
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}
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void *memmove(void *dst, const void *src, size_t n)
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{
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char *dstChar = dst;
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const char *srcChar = src;
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for (size_t i = 0; i < n; i++) {
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*(dstChar++) = *(srcChar++);
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}
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return dst;
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}
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void *memset(void *src, int c, size_t n)
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{
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for (char *ptr = (char *)src; n > 0; n--, ptr++) {
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*ptr = (char)c;
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}
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return src;
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}
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char *itoa(long long int value, char *str, int base)
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{
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char *rc;
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char *ptr;
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char *low;
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// Check for supported base.
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if (base < 2 || base > 36) {
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*str = '\0';
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return str;
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}
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rc = ptr = str;
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// Set '-' for negative decimals.
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if (value < 0 && base == 10) {
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*ptr++ = '-';
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}
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// Remember where the numbers start.
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low = ptr;
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// The actual conversion.
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do {
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// Modulo is negative for negative value. This trick makes abs() unnecessary.
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*ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz"
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[35 + value % base];
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value /= base;
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} while (value);
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// Terminating the string.
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*ptr-- = '\0';
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// Invert the numbers.
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while (low < ptr) {
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char tmp = *low;
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*low++ = *ptr;
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*ptr-- = tmp;
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}
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return rc;
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}
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int atoi(const char *str)
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{
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int sign = 1, base = 0, i = 0;
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// if whitespaces then ignore.
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while (str[i] == ' ') {
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i++;
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}
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// sign of number
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if (str[i] == '-' || str[i] == '+') {
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sign = 1 - 2 * (str[i++] == '-');
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}
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// checking for valid input
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while (str[i] >= '0' && str[i] <= '9') {
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// handling overflow test case
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if (base > INT_MAX / 10 || (base == INT_MAX / 10 && str[i] - '0' > 7)) {
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if (sign == 1)
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return INT_MAX;
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else
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return INT_MIN;
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}
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base = 10 * base + (str[i++] - '0');
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}
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return base * sign;
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}
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/* K&R */
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void reverse(char s[])
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{
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int c, i, j;
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for (i = 0, j = strlen(s) - 1; i < j; i++, j--) {
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c = s[i];
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s[i] = s[j];
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s[j] = c;
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}
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}
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/* K&R */
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int strlen(const char s[])
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{
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int i = 0;
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while (s[i] != '\0')
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++i;
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return i;
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}
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/* K&R
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* Returns <0 if s1<s2, 0 if s1==s2, >0 if s1>s2 */
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int strcmp(const char s1[], const char s2[])
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{
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int i;
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for (i = 0; s1[i] == s2[i]; i++) {
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if (s1[i] == '\0')
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return 0;
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}
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return s1[i] - s2[i];
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}
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unsigned int strnlen(const char *s, size_t count)
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{
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const char *sc;
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for (sc = s; count-- && *sc != '\0'; ++sc)
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/* nothing */ continue;
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return sc - s;
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}
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char *strzcpy(register char *dst, register const char *src, register int len)
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{
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int i;
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if (len <= 0)
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return dst;
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for (i = 0; i < len; i++) {
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dst[i] = src[i];
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if (src[i] == '\0')
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return dst;
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}
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dst[len - 1] = '\0';
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return dst;
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}
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int printf(const char *format, ...)
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{
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int ret;
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va_list ap;
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va_start(ap, format);
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ret = vprintf(format, ap);
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va_end(ap);
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return ret;
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}
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int puts(const char *str)
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{
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int ret = 0;
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while (*str) {
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putc(*(str++));
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ret++;
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}
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return ret;
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}
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int putc(const char c)
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{
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VGAPutc(c);
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serialPutc(c);
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return (unsigned char)c;
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}
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// int max is 2^(sizeof(int)*8) which is (2^3)^(sizeof(int)*8/3)
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// = 8^(sizeof(int)*8/3) ~ 10^(sizeof(int)*8/3)
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#define PRINT_INT(name, type) \
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int print##name(type integer, char *str, size_t size) \
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{ \
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char num[sizeof(integer) * 3]; \
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int i = 0; \
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int c = 0; \
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int ret = 0; \
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\
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if (integer < 0) { \
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if (str) { \
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if (size) { \
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str[c++] = '-'; \
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size--; \
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ret++; \
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} else { \
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return ret; \
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} \
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} else { \
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ret++; \
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} \
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} \
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\
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do { \
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int digit = integer % 10; \
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num[i++] = (digit > 0) ? digit : -digit; \
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integer = integer / 10; \
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} while (integer != 0); \
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\
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for (i = i - 1; i >= 0; i--) { \
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if (str) { \
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if (size) { \
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str[c++] = num[i] + '0'; \
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size--; \
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ret++; \
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} else { \
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return ret; \
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} \
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} else { \
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ret++; \
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} \
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} \
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return ret; \
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}
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#define PRINT_UINT(name, type) \
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int print##name(type integer, char *str, size_t size) \
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{ \
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char num[sizeof(integer) * 3]; \
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int i = 0; \
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int c = 0; \
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int ret = 0; \
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\
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do { \
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int digit = integer % 10; \
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num[i++] = (digit > 0) ? digit : -digit; \
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integer = integer / 10; \
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} while (integer != 0); \
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\
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for (i = i - 1; i >= 0; i--) { \
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if (str) { \
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if (size) { \
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str[c++] = num[i] + '0'; \
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size--; \
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ret++; \
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} else { \
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return ret; \
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} \
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} else { \
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ret++; \
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} \
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} \
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return ret; \
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}
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PRINT_INT(Int, int);
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PRINT_INT(Lint, long int);
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PRINT_INT(Llint, long long int);
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PRINT_UINT(Uint, unsigned int);
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PRINT_UINT(Luint, long unsigned int);
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PRINT_UINT(Lluint, long long unsigned int);
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#define PRINT_PART(func, type, str, size, c, ret) \
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{ \
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int s; \
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type d = va_arg(ap, type); \
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if (str) \
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s = func(d, &str[c], size); \
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else \
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s = func(d, NULL, size); \
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\
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size -= s; \
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c += s; \
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ret += s; \
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break; \
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}
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int vsnprintf(char *str, size_t size, const char *format, va_list ap)
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{
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int ret = 0;
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int i = 0;
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int c = 0;
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while (format[i] != '\0' && (size|| !str)) {
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switch (format[i]) {
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case '%':
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switch (format[i + 1]) {
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case 'i':
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case 'd': PRINT_PART(printInt, int, str, size, c, ret)
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case 'u': PRINT_PART(printUint, uint, str, size, c, ret)
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case 'p':
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case 'x': {
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char val[sizeof(int) * 2];
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unsigned int valIdx = 0;
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int d = va_arg(ap, int);
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itoa(d, val, 16);
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if (str) {
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while (val[valIdx]) {
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if (size) {
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str[c++] = val[valIdx++];
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size--;
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ret++;
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} else {
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return ret;
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}
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}
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} else {
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ret += strlen(val);
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}
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break;
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}
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case 'c': {
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if (str) {
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int ch = va_arg(ap, int);
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str[c++] = ch;
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size--;
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}
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ret++;
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break;
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}
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case 's': {
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char *stri = va_arg(ap, char *);
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if (!stri)
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stri = "[NULL STR]";
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if (str) {
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while (*stri) {
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if (size) {
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str[c++] = *(stri++);
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size--;
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ret++;
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} else {
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return ret;
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}
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}
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} else {
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ret += strlen(stri);
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}
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break;
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}
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case '%':
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if (str) {
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str[c++] = '%';
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size--;
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}
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ret++;
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break;
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case 'l':
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switch (format[i + 2]) {
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case 'l':
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switch (format[i + 3]) {
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case 'i':
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case 'd': PRINT_PART(printLlint, long long int, str, size, c, ret)
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case 'u': PRINT_PART(printLluint, long long unsigned int, str, size, c, ret)
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case 'p':
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case 'x': {
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char val[sizeof(long long int) * 2];
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unsigned int valIdx = 0;
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long long int d = va_arg(ap, long long int);
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itoa(d, val, 16);
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if (str) {
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while (val[valIdx]) {
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if (size) {
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str[c++] = val[valIdx++];
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size--;
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ret++;
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} else {
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return ret;
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}
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}
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} else {
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ret += strlen(val);
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}
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break;
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}
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}
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i++;
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break;
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case 'i':
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case 'd': PRINT_PART(printLint, long int, str, size, c, ret)
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case 'u':
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PRINT_PART(printLuint, long unsigned int, str, size, c, ret)
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case 'p':
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case 'x': {
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char val[sizeof(int) * 2];
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unsigned int valIdx = 0;
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long int d = va_arg(ap, long int);
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itoa(d, val, 16);
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if (str) {
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while (val[valIdx]) {
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if (size) {
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str[c++] = val[valIdx++];
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size--;
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ret++;
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} else {
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return ret;
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}
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}
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} else {
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ret += strlen(val);
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}
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break;
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}
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}
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i++;
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break;
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}
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i++;
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break;
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default:
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if (str) {
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str[c++] = format[i];
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size--;
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}
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ret++;
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}
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i++;
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}
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if (str) {
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if (size) {
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str[c++] = '\0';
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} else {
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if (c > 0) {
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str[c - 1] = '\0';
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}
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}
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}
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return ret;
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}
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int vprintf(const char *fmt, va_list ap)
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{
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char tmp[256];
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int idx = 0;
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int ret = vsnprintf(tmp, sizeof(tmp), fmt, ap);
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while (ret > 0 && tmp[idx]) {
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putc(tmp[idx++]);
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}
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return ret;
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}
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int asprintf(char **strp, const char *fmt, ...)
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{
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int ret;
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va_list ap;
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va_start(ap, fmt);
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ret = vasprintf(strp, fmt, ap);
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va_end(ap);
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return ret;
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}
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int vasprintf(char **strp, const char *fmt, va_list ap)
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{
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int n = 0;
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size_t size = 0;
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char *p = NULL;
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/* Determine required size */
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n = vsnprintf(p, size, fmt, ap);
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if (n < 0)
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return -1;
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/* One extra byte for '\0' */
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size = (size_t)n + 1;
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p = malloc(size);
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if (p == NULL)
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return -1;
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n = vsnprintf(p, size, fmt, ap);
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if (n < 0) {
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free(p);
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return -1;
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}
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*strp = p;
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return size;
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}
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