| 1 | /*
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| 2 | * $Id$
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| 3 | *
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| 4 | * Code (c)2006 Bruno Cornec <bruno@mondorescue.org>
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| 5 | *
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| 6 | * Main file of mr_msg : a very small and simple
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| 7 | * library for messages management
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| 8 | *
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| 9 | * Provided under the GPLv2
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| 10 | */
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| 11 |
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| 12 | #ifndef _GNU_SOURCE
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| 13 | #define _GNU_SOURCE
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| 14 | #endif
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| 15 | #include <stdio.h>
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| 16 | #include <stdarg.h>
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| 17 | #include <stdlib.h>
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| 18 |
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| 19 | static int mr_loglevel = 0;
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| 20 | static char *mr_logfile = NULL;
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| 21 | static FILE *mr_flog = NULL;
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| 22 |
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| 23 | /*
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| 24 | * This function is in the lowest part of the tree
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| 25 | * It should not depend on any other function of the mr lib
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| 26 | */
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| 27 |
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| 28 | /* Function allowing to change loglevel after init */
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| 29 | void mr_msg_loglevel(int loglevel) {
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| 30 |
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| 31 | mr_loglevel = loglevel;
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| 32 | }
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| 33 |
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| 34 | /* Cleanup function for messages */
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| 35 | void mr_msg_close(void) {
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| 36 |
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| 37 | int res = 0;
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| 38 | if ((res = fclose(mr_flog)) != 0) {
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| 39 | fprintf(stderr,"Unable to close %s\n",mr_logfile);
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| 40 | }
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| 41 | free(mr_logfile);
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| 42 |
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| 43 | mr_logfile = NULL;
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| 44 | mr_loglevel = 0;
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| 45 | mr_flog = NULL;
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| 46 | return;
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| 47 | }
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| 48 |
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| 49 | /* Initialization function for messages */
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| 50 | void mr_msg_init(const char *logfile, int loglevel) {
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| 51 | if (asprintf(&mr_logfile, "%s", logfile) == -1) {
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| 52 | fprintf(stderr,"Unable to alloc memory\n");
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| 53 | fprintf(stderr,"Logging desactivated\n");
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| 54 | mr_msg_close();
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| 55 | }
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| 56 | if (fopen(mr_logfile, "r") == NULL) {
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| 57 | /* log file doesn't exist yet, so creating it */
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| 58 | if ((mr_flog = fopen(mr_logfile, "w")) == NULL) {
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| 59 | fprintf(stderr,"Unable to write to %s\n",mr_logfile);
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| 60 | fprintf(stderr,"Logging desactivated\n");
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| 61 | mr_msg_close();
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| 62 | }
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| 63 | } else {
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| 64 | /* If it exists try to append to it */
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| 65 | if ((mr_flog = fopen(mr_logfile, "a")) == NULL) {
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| 66 | fprintf(stderr,"Unable to write to %s\n",mr_logfile);
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| 67 | fprintf(stderr,"Logging desactivated\n");
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| 68 | mr_msg_close();
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| 69 | }
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| 70 | }
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| 71 | mr_msg_loglevel(loglevel);
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| 72 | }
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| 73 |
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| 74 | /*
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| 75 | * Function that log a message. Not called directly
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| 76 | * but through other functions
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| 77 | * fmt needs to be just before ...
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| 78 | * level should be >0 to have file and line printed (real debug)
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| 79 | * If =0 it's an informative log message
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| 80 | */
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| 81 | void mr_msg_int(int level, int line, const char *file, char *function, const char *fmt, ...) {
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| 82 |
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| 83 | va_list args;
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| 84 |
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| 85 | if ((mr_logfile == NULL) || (mr_flog == NULL)) {
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| 86 | return;
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| 87 | }
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| 88 |
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| 89 | if (level <= mr_loglevel) {
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| 90 | if (level > 0) {
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| 91 | fprintf(mr_flog, "DBG%d: ", level);
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| 92 | fprintf(mr_flog, "%s->%s#%d: ", file, function, line);
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| 93 | } else {
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| 94 | fprintf(mr_flog, "INFO: ");
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| 95 | }
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| 96 | va_start(args,fmt);
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| 97 | if (vfprintf(mr_flog, fmt, args) < 0) {
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| 98 | fprintf(stderr,"Unable to print to %s\n",mr_logfile);
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| 99 | }
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| 100 | fprintf(mr_flog,"\n");
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| 101 | va_end(args);
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| 102 |
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| 103 | }
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| 104 | return;
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| 105 | }
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| 106 |
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