0d53667334
Let's replace usage of fputc_unlocked() and friends by __fsetlocking(f,
FSETLOCKING_BYCALLER). This turns off locking for the entire FILE*,
instead of doing individual per-call decision whether to use normal
calls or _unlocked() calls.
This has various benefits:
1. It's easier to read and easier not to forget
2. It's more comprehensive, as fprintf() and friends are covered too
(as these functions have no _unlocked() counterpart)
3. Philosophically, it's a bit more correct, because it's more a
property of the file handle really whether we ever pass it on to another
thread, not of the operations we then apply to it.
This patch reworks all pieces of codes that so far used fxyz_unlocked()
calls to use __fsetlocking() instead. It also reworks all places that
use open_memstream(), i.e. use stdio FILE* for string manipulations.
Note that this in some way a revert of 4b61c87511.
140 lines
3.8 KiB
C
140 lines
3.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <qrencode.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include "journal-qrcode.h"
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#include "macro.h"
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#define WHITE_ON_BLACK "\033[40;37;1m"
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#define NORMAL "\033[0m"
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static void print_border(FILE *output, unsigned width) {
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unsigned x, y;
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/* Four rows of border */
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for (y = 0; y < 4; y += 2) {
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fputs(WHITE_ON_BLACK, output);
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for (x = 0; x < 4 + width + 4; x++)
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fputs("\342\226\210", output);
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fputs(NORMAL "\n", output);
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}
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}
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int print_qr_code(
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FILE *output,
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const void *seed,
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size_t seed_size,
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uint64_t start,
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uint64_t interval,
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const char *hn,
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sd_id128_t machine) {
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FILE *f;
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char *url = NULL;
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size_t url_size = 0, i;
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QRcode* qr;
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unsigned x, y;
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assert(seed);
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assert(seed_size > 0);
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f = open_memstream(&url, &url_size);
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if (!f)
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return -ENOMEM;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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fputs("fss://", f);
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for (i = 0; i < seed_size; i++) {
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if (i > 0 && i % 3 == 0)
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fputc('-', f);
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fprintf(f, "%02x", ((uint8_t*) seed)[i]);
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}
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fprintf(f, "/%"PRIx64"-%"PRIx64"?machine=" SD_ID128_FORMAT_STR,
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start,
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interval,
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SD_ID128_FORMAT_VAL(machine));
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if (hn)
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fprintf(f, ";hostname=%s", hn);
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if (ferror(f)) {
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fclose(f);
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free(url);
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return -ENOMEM;
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}
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fclose(f);
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qr = QRcode_encodeString(url, 0, QR_ECLEVEL_L, QR_MODE_8, 1);
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free(url);
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if (!qr)
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return -ENOMEM;
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print_border(output, qr->width);
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for (y = 0; y < (unsigned) qr->width; y += 2) {
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const uint8_t *row1, *row2;
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row1 = qr->data + qr->width * y;
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row2 = row1 + qr->width;
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fputs(WHITE_ON_BLACK, output);
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for (x = 0; x < 4; x++)
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fputs("\342\226\210", output);
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for (x = 0; x < (unsigned) qr->width; x ++) {
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bool a, b;
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a = row1[x] & 1;
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b = (y+1) < (unsigned) qr->width ? (row2[x] & 1) : false;
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if (a && b)
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fputc(' ', output);
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else if (a)
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fputs("\342\226\204", output);
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else if (b)
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fputs("\342\226\200", output);
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else
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fputs("\342\226\210", output);
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}
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for (x = 0; x < 4; x++)
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fputs("\342\226\210", output);
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fputs(NORMAL "\n", output);
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}
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print_border(output, qr->width);
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QRcode_free(qr);
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return 0;
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}
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