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cowos moves to 64bit! and framebuffers too ig
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cowmonk
parent
b78e4fc24d
commit
babc65305d
32 changed files with 4074 additions and 146 deletions
353
kernel/include/klibc/stdlib.h
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353
kernel/include/klibc/stdlib.h
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/*
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* stdlib function definitions for NOLIBC
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* Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _NOLIBC_STDLIB_H
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#define _NOLIBC_STDLIB_H
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#include "std.h"
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#include "arch.h"
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#include "types.h"
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#include "sys.h"
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/* Buffer used to store int-to-ASCII conversions. Will only be implemented if
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* any of the related functions is implemented. The area is large enough to
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* store "18446744073709551615" or "-9223372036854775808" and the final zero.
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*/
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static __attribute__((unused)) char itoa_buffer[21];
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/*
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* As much as possible, please keep functions alphabetically sorted.
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*/
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/* must be exported, as it's used by libgcc for various divide functions */
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__attribute__((weak,unused,noreturn,section(".text.nolibc_abort")))
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void abort(void)
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{
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sys_kill(sys_getpid(), SIGABRT);
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for (;;);
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}
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static __attribute__((unused))
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long atol(const char *s)
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{
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unsigned long ret = 0;
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unsigned long d;
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int neg = 0;
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if (*s == '-') {
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neg = 1;
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s++;
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}
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while (1) {
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d = (*s++) - '0';
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if (d > 9)
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break;
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ret *= 10;
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ret += d;
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}
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return neg ? -ret : ret;
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}
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static __attribute__((unused))
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int atoi(const char *s)
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{
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return atol(s);
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}
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/* Tries to find the environment variable named <name> in the environment array
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* pointed to by global variable "environ" which must be declared as a char **,
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* and must be terminated by a NULL (it is recommended to set this variable to
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* the "envp" argument of main()). If the requested environment variable exists
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* its value is returned otherwise NULL is returned.
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*/
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static __attribute__((unused))
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char *getenv(const char *name)
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{
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extern char **environ;
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int idx, i;
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if (environ) {
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for (idx = 0; environ[idx]; idx++) {
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for (i = 0; name[i] && name[i] == environ[idx][i];)
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i++;
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if (!name[i] && environ[idx][i] == '=')
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return &environ[idx][i+1];
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}
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}
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return NULL;
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}
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/* Converts the unsigned long integer <in> to its hex representation into
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* buffer <buffer>, which must be long enough to store the number and the
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* trailing zero (17 bytes for "ffffffffffffffff" or 9 for "ffffffff"). The
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* buffer is filled from the first byte, and the number of characters emitted
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* (not counting the trailing zero) is returned. The function is constructed
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* in a way to optimize the code size and avoid any divide that could add a
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* dependency on large external functions.
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*/
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static __attribute__((unused))
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int utoh_r(unsigned long in, char *buffer)
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{
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signed char pos = (~0UL > 0xfffffffful) ? 60 : 28;
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int digits = 0;
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int dig;
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do {
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dig = in >> pos;
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in -= (uint64_t)dig << pos;
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pos -= 4;
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if (dig || digits || pos < 0) {
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if (dig > 9)
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dig += 'a' - '0' - 10;
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buffer[digits++] = '0' + dig;
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}
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} while (pos >= 0);
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buffer[digits] = 0;
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return digits;
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}
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/* converts unsigned long <in> to an hex string using the static itoa_buffer
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* and returns the pointer to that string.
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*/
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static inline __attribute__((unused))
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char *utoh(unsigned long in)
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{
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utoh_r(in, itoa_buffer);
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return itoa_buffer;
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}
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/* Converts the unsigned long integer <in> to its string representation into
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* buffer <buffer>, which must be long enough to store the number and the
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* trailing zero (21 bytes for 18446744073709551615 in 64-bit, 11 for
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* 4294967295 in 32-bit). The buffer is filled from the first byte, and the
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* number of characters emitted (not counting the trailing zero) is returned.
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* The function is constructed in a way to optimize the code size and avoid
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* any divide that could add a dependency on large external functions.
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*/
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static __attribute__((unused))
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int utoa_r(unsigned long in, char *buffer)
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{
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unsigned long lim;
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int digits = 0;
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int pos = (~0UL > 0xfffffffful) ? 19 : 9;
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int dig;
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do {
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for (dig = 0, lim = 1; dig < pos; dig++)
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lim *= 10;
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if (digits || in >= lim || !pos) {
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for (dig = 0; in >= lim; dig++)
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in -= lim;
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buffer[digits++] = '0' + dig;
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}
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} while (pos--);
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buffer[digits] = 0;
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return digits;
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}
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/* Converts the signed long integer <in> to its string representation into
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* buffer <buffer>, which must be long enough to store the number and the
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* trailing zero (21 bytes for -9223372036854775808 in 64-bit, 12 for
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* -2147483648 in 32-bit). The buffer is filled from the first byte, and the
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* number of characters emitted (not counting the trailing zero) is returned.
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*/
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static __attribute__((unused))
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int itoa_r(long in, char *buffer)
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{
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char *ptr = buffer;
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int len = 0;
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if (in < 0) {
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in = -in;
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*(ptr++) = '-';
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len++;
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}
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len += utoa_r(in, ptr);
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return len;
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}
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/* for historical compatibility, same as above but returns the pointer to the
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* buffer.
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*/
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static inline __attribute__((unused))
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char *ltoa_r(long in, char *buffer)
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{
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itoa_r(in, buffer);
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return buffer;
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}
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/* converts long integer <in> to a string using the static itoa_buffer and
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* returns the pointer to that string.
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*/
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static inline __attribute__((unused))
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char *itoa(long in)
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{
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itoa_r(in, itoa_buffer);
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return itoa_buffer;
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}
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/* converts long integer <in> to a string using the static itoa_buffer and
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* returns the pointer to that string. Same as above, for compatibility.
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*/
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static inline __attribute__((unused))
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char *ltoa(long in)
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{
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itoa_r(in, itoa_buffer);
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return itoa_buffer;
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}
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/* converts unsigned long integer <in> to a string using the static itoa_buffer
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* and returns the pointer to that string.
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*/
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static inline __attribute__((unused))
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char *utoa(unsigned long in)
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{
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utoa_r(in, itoa_buffer);
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return itoa_buffer;
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}
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/* Converts the unsigned 64-bit integer <in> to its hex representation into
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* buffer <buffer>, which must be long enough to store the number and the
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* trailing zero (17 bytes for "ffffffffffffffff"). The buffer is filled from
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* the first byte, and the number of characters emitted (not counting the
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* trailing zero) is returned. The function is constructed in a way to optimize
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* the code size and avoid any divide that could add a dependency on large
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* external functions.
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*/
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static __attribute__((unused))
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int u64toh_r(uint64_t in, char *buffer)
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{
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signed char pos = 60;
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int digits = 0;
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int dig;
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do {
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if (sizeof(long) >= 8) {
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dig = (in >> pos) & 0xF;
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} else {
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/* 32-bit platforms: avoid a 64-bit shift */
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uint32_t d = (pos >= 32) ? (in >> 32) : in;
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dig = (d >> (pos & 31)) & 0xF;
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}
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if (dig > 9)
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dig += 'a' - '0' - 10;
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pos -= 4;
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if (dig || digits || pos < 0)
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buffer[digits++] = '0' + dig;
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} while (pos >= 0);
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buffer[digits] = 0;
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return digits;
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}
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/* converts uint64_t <in> to an hex string using the static itoa_buffer and
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* returns the pointer to that string.
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*/
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static inline __attribute__((unused))
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char *u64toh(uint64_t in)
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{
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u64toh_r(in, itoa_buffer);
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return itoa_buffer;
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}
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/* Converts the unsigned 64-bit integer <in> to its string representation into
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* buffer <buffer>, which must be long enough to store the number and the
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* trailing zero (21 bytes for 18446744073709551615). The buffer is filled from
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* the first byte, and the number of characters emitted (not counting the
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* trailing zero) is returned. The function is constructed in a way to optimize
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* the code size and avoid any divide that could add a dependency on large
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* external functions.
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*/
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static __attribute__((unused))
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int u64toa_r(uint64_t in, char *buffer)
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{
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unsigned long long lim;
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int digits = 0;
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int pos = 19; /* start with the highest possible digit */
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int dig;
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do {
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for (dig = 0, lim = 1; dig < pos; dig++)
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lim *= 10;
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if (digits || in >= lim || !pos) {
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for (dig = 0; in >= lim; dig++)
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in -= lim;
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buffer[digits++] = '0' + dig;
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}
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} while (pos--);
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buffer[digits] = 0;
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return digits;
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}
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/* Converts the signed 64-bit integer <in> to its string representation into
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* buffer <buffer>, which must be long enough to store the number and the
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* trailing zero (21 bytes for -9223372036854775808). The buffer is filled from
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* the first byte, and the number of characters emitted (not counting the
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* trailing zero) is returned.
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*/
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static __attribute__((unused))
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int i64toa_r(int64_t in, char *buffer)
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{
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char *ptr = buffer;
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int len = 0;
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if (in < 0) {
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in = -in;
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*(ptr++) = '-';
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len++;
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}
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len += u64toa_r(in, ptr);
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return len;
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}
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/* converts int64_t <in> to a string using the static itoa_buffer and returns
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* the pointer to that string.
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*/
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static inline __attribute__((unused))
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char *i64toa(int64_t in)
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{
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i64toa_r(in, itoa_buffer);
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return itoa_buffer;
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}
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/* converts uint64_t <in> to a string using the static itoa_buffer and returns
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* the pointer to that string.
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*/
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static inline __attribute__((unused))
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char *u64toa(uint64_t in)
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{
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u64toa_r(in, itoa_buffer);
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return itoa_buffer;
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}
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#endif /* _NOLIBC_STDLIB_H */
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