cosmopolitan/libc/calls/tinyprint.c
Jōshin e16a7d8f3b
flip et / noet in modelines
`et` means `expandtab`.

```sh
rg 'vi: .* :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\)  :vi/vi: \1 xoet\2:vi/'
rg 'vi: .*  :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2  :vi/'
rg 'vi: .*  :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/'
```
2023-12-07 22:17:11 -05:00

80 lines
3.3 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2023 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/calls/blockcancel.internal.h"
#include "libc/calls/calls.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/runtime/runtime.h"
#define ASAN_ERROR "error: tinyprint() passed invalid memory, or missing NULL\n"
static bool tinyflush(int fd, char *buf, size_t n, ssize_t *toto) {
ssize_t rc;
if ((rc = write(fd, buf, n)) != -1) {
*toto += rc;
return false;
} else {
if (!*toto) {
--*toto;
}
return true;
}
}
/**
* Writes strings to file descriptor, e.g.
*
* tinyprint(1, "hello", " ", "world", "\n", NULL);
*
* This function is intended so that small command line programs (e.g.
* build utilities) can print succinct error messages automatically to
* standard io without linking too much binary footprint.
*
* @param fd is file descriptor
* @param s is NUL-terminated string, or NULL
* @return bytes written on success, or -1 w/ errno
*/
ssize_t tinyprint(int fd, const char *s, ...) {
int c;
size_t n;
va_list va;
ssize_t toto;
char buf[512];
BLOCK_CANCELATION;
va_start(va, s);
for (toto = n = 0; s; s = va_arg(va, const char *)) {
if (IsAsan() && !__asan_is_valid_str(s)) {
write(2, ASAN_ERROR, sizeof(ASAN_ERROR) - 1);
abort();
}
while ((c = *s++)) {
buf[n++] = c;
if (n == sizeof(buf)) {
if (tinyflush(fd, buf, n, &toto)) {
return toto;
}
n = 0;
}
}
}
va_end(va);
tinyflush(fd, buf, n, &toto);
ALLOW_CANCELATION;
return toto;
}