~mdw / dpkg / blame
| Commit | Line | Data |
|---|---|---|
| 1479465f GJ |
1 | /* |
| 2 | * libdpkg - Debian packaging suite library routines | |
| 3 | * debug.c - debugging support | |
| 4 | * | |
| 5 | * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk> | |
| 6 | * Copyright © 2011 Guillem Jover <guillem@debian.org> | |
| 7 | * | |
| 8 | * This is free software; you can redistribute it and/or modify | |
| 9 | * it under the terms of the GNU General Public License as published by | |
| 10 | * the Free Software Foundation; either version 2 of the License, or | |
| 11 | * (at your option) any later version. | |
| 12 | * | |
| 13 | * This is distributed in the hope that it will be useful, | |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 | * GNU General Public License for more details. | |
| 17 | * | |
| 18 | * You should have received a copy of the GNU General Public License | |
| 19 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
| 20 | */ | |
| 21 | ||
| 22 | #include <config.h> | |
| 23 | #include <compat.h> | |
| 24 | ||
| 25 | #include <stdarg.h> | |
| 26 | #include <stdio.h> | |
| 27 | ||
| 28 | #include <dpkg/dpkg.h> | |
| 29 | #include <dpkg/report.h> | |
| 30 | #include <dpkg/debug.h> | |
| 31 | ||
| 32 | static int debug_mask = 0; | |
| 33 | static FILE *debug_output = NULL; | |
| 34 | ||
| 35 | /** | |
| 36 | * Set the debugging output file. | |
| 37 | * | |
| 38 | * Marks the file descriptor as close-on-exec. | |
| 39 | */ | |
| 40 | void | |
| 41 | debug_set_output(FILE *output, const char *filename) | |
| 42 | { | |
| 43 | setcloexec(fileno(output), filename); | |
| 44 | dpkg_set_report_buffer(output); | |
| 45 | debug_output = output; | |
| 46 | } | |
| 47 | ||
| 48 | /** | |
| 49 | * Set the debugging mask. | |
| 50 | * | |
| 51 | * The mask determines what debugging flags are going to take effect at | |
| 52 | * run-time. The output will be set to stderr if it has not been set before. | |
| 53 | */ | |
| 54 | void | |
| 55 | debug_set_mask(int mask) | |
| 56 | { | |
| 57 | debug_mask = mask; | |
| 58 | if (!debug_output) | |
| 59 | debug_output = stderr; | |
| 60 | } | |
| 61 | ||
| 62 | /** | |
| 63 | * Check if a debugging flag is currently set on the debugging mask. | |
| 64 | */ | |
| 65 | bool | |
| 66 | debug_has_flag(int flag) | |
| 67 | { | |
| 68 | return debug_mask & flag; | |
| 69 | } | |
| 70 | ||
| 71 | /** | |
| 72 | * Output a debugging message. | |
| 73 | * | |
| 74 | * The message will be printed to the previously specified output if the | |
| 75 | * specified flag is present in the current debugging mask. | |
| 76 | */ | |
| 77 | void | |
| 78 | debug(int flag, const char *fmt, ...) | |
| 79 | { | |
| 80 | va_list args; | |
| 81 | ||
| 82 | if (!debug_has_flag(flag)) | |
| 83 | return; | |
| 84 | ||
| 85 | fprintf(debug_output, "D0%05o: ", flag); | |
| 86 | va_start(args, fmt); | |
| 87 | vfprintf(debug_output, fmt, args); | |
| 88 | va_end(args); | |
| 89 | putc('\n', debug_output); | |
| 90 | } |