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https://github.com/FAUSheppy/colorredstderr-mirror
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56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/*
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* Debug functions.
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*
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* Copyright (C) 2013 Simon Ruderich
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef DEBUG_H
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#define DEBUG_H 1
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static void debug(const char *format, ...) {
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char buffer[1024];
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/* If the file doesn't exist, do nothing. Prevents writing log files in
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* unexpected places. The user must create the file manually. */
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int fd = open(DEBUG_FILE, O_WRONLY | O_APPEND);
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if (fd == -1) {
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return;
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}
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va_list ap;
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va_start(ap, format);
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int written = vsnprintf(buffer, sizeof(buffer), format, ap);
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va_end(ap);
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/* Overflow. */
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if ((size_t)written >= sizeof(buffer)) {
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written = sizeof(buffer) - 1;
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}
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/* Make sure these functions are loaded. */
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DLSYM_FUNCTION(real_write, "write");
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DLSYM_FUNCTION(real_close, "close");
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static int first_call = 0;
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if (!first_call++) {
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char nl = '\n';
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real_write(fd, &nl, 1);
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}
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real_write(fd, buffer, (size_t)written);
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real_close(fd);
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}
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#endif
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