src/logger.c

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#include <assert.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>

#include "logger.h"
#include "utf8.h"

static const char *log_levels[] =
{
        "emerg",
        "alert",
        "critic",
        "error",
        "warning",
        "notice",
        "info",
        "debug",
        "dump"
};

static FILE *log_filename;

void open_log()
{
        log_filename = fopen(CONFIG_LOG_FILENAME, "wt");
}

bool log_dump_latin1(const char *var, const char *value)
{
        char utf8[256];

        assert(var != NULL);
        assert(value != NULL);

        iso8859_utf8(value, utf8, sizeof(utf8));

        return add_log(ADDLOG_DUMP, "[log]dump", "%s(latin1): '%s'\n", var, utf8);
}

bool log_dump(const char *var, const char *value)
{
        assert(var != NULL);
        assert(value != NULL);

        return add_log(ADDLOG_DUMP, "[log]dump", "%s(utf8): '%s'\n", var, value);
}

bool add_log(int level, const char *context, const char *format, ...)
{
        va_list ap;

        assert(context != NULL);
        assert(format != NULL);
        assert(log_filename != NULL);
        assert((level >= LOG_EMERG) && (level <= LOG_DEBUG));

        /* too verbose */
        if (level > CONFIG_LOG_LEVEL)
        {
                return true;
        }

        /* output not open */
        if (log_filename == NULL)
        {
                log_filename = fopen(CONFIG_LOG_FILENAME, "at");
                if (log_filename == NULL)
                {
                        return false;
                }
        }

        /* print header */
        if (fprintf(log_filename, "%s.%s: ", context, log_levels[level]) < 0)
        {
                return false;
        }

        /* print message */
        va_start(ap, format);
        if (vfprintf(log_filename, format, ap) >= 0)
        {
                va_end (ap);
                fflush(log_filename);

                return true;
        }
        va_end (ap);

        return false;
}

void close_log()
{
        assert(log_filename != NULL);
        fclose(log_filename);

        log_filename = NULL;
}

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