mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
33e8fc8687
You can now do epic things like this:
puts(_gc(xasprintf("%d", 123)));
The _gc() API is shorthand for _defer() which works like Go's keyword:
const char *s = xasprintf("%d", 123);
_defer(free, s);
puts(s);
Be sure to always use -fno-omit-frame-pointer which makes code fast too.
Enjoy! See also #114
76 lines
3.4 KiB
C
76 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#define ShouldUseMsabiAttribute() 1
|
|
#include "libc/dce.h"
|
|
#include "libc/nt/files.h"
|
|
#include "libc/nt/runtime.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/consts/fileno.h"
|
|
#include "libc/sysv/consts/nr.h"
|
|
|
|
/* TODO(jart): DELETE */
|
|
|
|
#define WasImported(SLOT) \
|
|
((void *)*SLOT && *SLOT != (void *)&missingno /* see libc/crt/crt.S */)
|
|
|
|
static void __sys_print_nt(const void *data, size_t len) {
|
|
int64_t hand;
|
|
char xmm[256];
|
|
uint32_t wrote;
|
|
_savexmm(xmm + 128);
|
|
hand = __imp_GetStdHandle(kNtStdErrorHandle);
|
|
__imp_WriteFile(hand, data, len, &wrote, NULL);
|
|
_loadxmm(xmm + 128);
|
|
}
|
|
|
|
/**
|
|
* Prints string, by any means necessary.
|
|
*
|
|
* This function offers a subset of write(STDERR_FILENO) functionality.
|
|
* It's designed to work even when the runtime hasn't initialized, e.g.
|
|
* before _init() gets called.
|
|
*
|
|
* @param len can be computed w/ tinystrlen()
|
|
* @clob nothing except flags
|
|
*/
|
|
privileged noinline void __print(const void *data, size_t len) {
|
|
int64_t ax, ordinal;
|
|
if (WasImported(__imp_WriteFile)) {
|
|
__sys_print_nt(data, len);
|
|
} else {
|
|
ordinal = __NR_write > 0 ? __NR_write : IsXnu() ? 0x2000004 : 4;
|
|
asm volatile("syscall"
|
|
: "=a"(ax)
|
|
: "0"(ordinal), "D"(STDERR_FILENO), "S"(data), "d"(len)
|
|
: "rcx", "r11", "memory", "cc");
|
|
if (ax == -1 && !__hostos && !__NR_write) {
|
|
asm volatile("syscall"
|
|
: "=a"(ax)
|
|
: "0"(ordinal), "D"(STDERR_FILENO), "S"(data), "d"(len)
|
|
: "rcx", "r11", "memory", "cc");
|
|
}
|
|
}
|
|
}
|
|
|
|
void __print_string(const char *s) {
|
|
size_t n = 0;
|
|
while (s[n]) ++n;
|
|
__print(s, n);
|
|
}
|