mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
d5910e2673
- Fixed bug where stdio eof wasn't being sticky - Fixed bug where fseeko() wasn't clearing eof state - Removed assert() usage from libc favoring _unassert() / _npassert()
69 lines
3.1 KiB
C
69 lines
3.1 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 2021 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. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/assert.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/kprintf.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/mem/mem.h"
|
|
#include "libc/stdio/append.h"
|
|
|
|
#define W sizeof(size_t)
|
|
|
|
/**
|
|
* Appends formatted string to buffer.
|
|
*
|
|
* This is an alternative to vappendf() that uses the kprintf()
|
|
* formatting facility. This has some advantages in terms of
|
|
* performance, code size, and memory safety. There's also
|
|
* disadvantages, such as lack of floating-point directives.
|
|
*
|
|
* @see kprintf()
|
|
*/
|
|
ssize_t kvappendf(char **b, const char *f, va_list v) {
|
|
char *p;
|
|
int r, s;
|
|
size_t n;
|
|
va_list w;
|
|
struct appendz z;
|
|
z = appendz((p = *b));
|
|
va_copy(w, v);
|
|
if ((r = kvsnprintf(p + z.i, z.n ? z.n - W - z.i : 0, f, v)) >= 0) {
|
|
n = ROUNDUP(z.i + r + 1, 8) + W;
|
|
if (n > z.n) {
|
|
if (!z.n) z.n = W * 2;
|
|
while (n > z.n) z.n += z.n >> 1;
|
|
z.n = ROUNDUP(z.n, W);
|
|
if ((p = realloc(p, z.n))) {
|
|
z.n = malloc_usable_size(p);
|
|
_unassert(!(z.n & (W - 1)));
|
|
s = kvsnprintf(p + z.i, z.n - W - z.i, f, w);
|
|
_unassert(s == r);
|
|
*b = p;
|
|
} else {
|
|
va_end(w);
|
|
return -1;
|
|
}
|
|
}
|
|
z.i += r;
|
|
if (!IsTiny() && W == 8) z.i |= (size_t)APPEND_COOKIE << 48;
|
|
*(size_t *)(p + z.n - W) = z.i;
|
|
}
|
|
va_end(w);
|
|
return r;
|
|
}
|