4 * Copyright (C) 2013 Simon Ruderich
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
23 static void debug_write(int fd, int first_call, char const *format, va_list ap) {
26 int written = vsnprintf(buffer, sizeof(buffer), format, ap);
28 return; /* shouldn't happen */
30 } else if ((size_t)written >= sizeof(buffer)) {
31 written = sizeof(buffer) - 1;
34 /* Make sure these functions are loaded. */
35 DLSYM_FUNCTION(real_write, "write");
36 DLSYM_FUNCTION(real_close, "close");
40 real_write(fd, &nl, 1);
42 real_write(fd, buffer, (size_t)written);
47 static void debug(char const *format, ...) {
50 int saved_errno = errno;
52 /* If the file doesn't exist, do nothing. Prevents writing log files in
53 * unexpected places. The user must create the file manually. */
54 int fd = open(DEBUG_FILE, O_WRONLY | O_APPEND);
60 static int call_count = 0;
64 debug_write(fd, call_count == 1, format, ap);
71 static void warning(char const *format, ...) {
74 int saved_errno = errno;
76 char const *home = getenv("HOME");
82 char path[strlen(home) + 1 + strlen(WARNING_FILE) + 1];
85 strcat(path, WARNING_FILE);
87 /* Create the warning file if it doesn't exist yet. */
88 int fd = open(path, O_WRONLY | O_APPEND | O_CREAT, S_IRUSR | S_IWUSR);
94 static int call_count = 0;
98 debug_write(fd, call_count == 1, format, ap);