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| 1 /*! \file exif-log.h |
| 2 * \brief Log message infrastructure |
| 3 */ |
| 4 /* |
| 5 * Copyright (c) 2004 Lutz Mueller <lutz@users.sourceforge.net> |
| 6 * |
| 7 * This library is free software; you can redistribute it and/or |
| 8 * modify it under the terms of the GNU Lesser General Public |
| 9 * License as published by the Free Software Foundation; either |
| 10 * version 2 of the License, or (at your option) any later version. |
| 11 * |
| 12 * This library is distributed in the hope that it will be useful, |
| 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 * Lesser General Public License for more details. |
| 16 * |
| 17 * You should have received a copy of the GNU Lesser General Public |
| 18 * License along with this library; if not, write to the |
| 19 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 * Boston, MA 02110-1301 USA. |
| 21 */ |
| 22 |
| 23 #ifndef __EXIF_LOG_H__ |
| 24 #define __EXIF_LOG_H__ |
| 25 |
| 26 #ifdef __cplusplus |
| 27 extern "C" { |
| 28 #endif /* __cplusplus */ |
| 29 |
| 30 #include <libexif/exif-mem.h> |
| 31 #include <stdarg.h> |
| 32 |
| 33 /*! State maintained by the logging interface */ |
| 34 typedef struct _ExifLog ExifLog; |
| 35 |
| 36 /*! Create a new logging instance. |
| 37 * \see exif_log_free |
| 38 * |
| 39 * \return new instance of #ExifLog |
| 40 */ |
| 41 ExifLog *exif_log_new (void); |
| 42 ExifLog *exif_log_new_mem (ExifMem *); |
| 43 void exif_log_ref (ExifLog *log); |
| 44 void exif_log_unref (ExifLog *log); |
| 45 |
| 46 /*! Delete instance of #ExifLog. |
| 47 * \see exif_log_new |
| 48 * |
| 49 * \param[in] log #ExifLog |
| 50 * \return new instance of #ExifLog |
| 51 */ |
| 52 void exif_log_free (ExifLog *log); |
| 53 |
| 54 typedef enum { |
| 55 EXIF_LOG_CODE_NONE, |
| 56 EXIF_LOG_CODE_DEBUG, |
| 57 EXIF_LOG_CODE_NO_MEMORY, |
| 58 EXIF_LOG_CODE_CORRUPT_DATA |
| 59 } ExifLogCode; |
| 60 |
| 61 /*! Return a textual description of the given class of error log. |
| 62 * |
| 63 * \param[in] code logging message class |
| 64 * \return textual description of the log class |
| 65 */ |
| 66 const char *exif_log_code_get_title (ExifLogCode code); |
| 67 |
| 68 /*! Return a verbose description of the given class of error log. |
| 69 * |
| 70 * \param[in] code logging message class |
| 71 * \return verbose description of the log class |
| 72 */ |
| 73 const char *exif_log_code_get_message (ExifLogCode code); |
| 74 |
| 75 /*! Log callback function prototype. |
| 76 */ |
| 77 typedef void (* ExifLogFunc) (ExifLog *log, ExifLogCode, const char *domain, |
| 78 const char *format, va_list args, void *data); |
| 79 |
| 80 /*! Register log callback function. |
| 81 * Calls to the log callback function are purely for diagnostic purposes. |
| 82 * |
| 83 * \param[in] log logging state variable |
| 84 * \param[in] func callback function to set |
| 85 * \param[in] data data to pass into callback function |
| 86 */ |
| 87 void exif_log_set_func (ExifLog *log, ExifLogFunc func, void *data); |
| 88 |
| 89 #ifndef NO_VERBOSE_TAG_STRINGS |
| 90 void exif_log (ExifLog *log, ExifLogCode, const char *domain, |
| 91 const char *format, ...) |
| 92 #ifdef __GNUC__ |
| 93 __attribute__((__format__(printf,4,5))) |
| 94 #endif |
| 95 ; |
| 96 #else |
| 97 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L |
| 98 #define exif_log(...) do { } while (0) |
| 99 #elif defined(__GNUC__) |
| 100 #define exif_log(x...) do { } while (0) |
| 101 #else |
| 102 #define exif_log (void) |
| 103 #endif |
| 104 #endif |
| 105 |
| 106 void exif_logv (ExifLog *log, ExifLogCode, const char *domain, |
| 107 const char *format, va_list args); |
| 108 |
| 109 /* For your convenience */ |
| 110 #define EXIF_LOG_NO_MEMORY(l,d,s) exif_log ((l), EXIF_LOG_CODE_NO_MEMORY, (d), "
Could not allocate %lu byte(s).", (unsigned long)(s)) |
| 111 |
| 112 #ifdef __cplusplus |
| 113 } |
| 114 #endif /* __cplusplus */ |
| 115 |
| 116 #endif /* __EXIF_LOG_H__ */ |
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