logging.c

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#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "boris.h"
#include "plugin.h"

#define LOGBASIC_LENGTH_MAX 1024

struct plugin_basiclog_class {
    struct plugin_basic_class base_class;
    struct plugin_logging_interface log_interface;
};

extern const struct plugin_basiclog_class plugin_class;

static int log_level=B_LOG_INFO;

static char *prio_names[] = {
    "ASSERT", "CRITIAL", "ERROR", "WARNING",
    "INFO", "TODO", "DEBUG", "TRACE"
};

static void do_log(int priority, const char *domain, const char *fmt, ...) {
    char buf[LOGBASIC_LENGTH_MAX];
    int i;
    va_list ap;

    assert(priority >= 0 && priority <= 7);
    assert(fmt != NULL);

    /* write priority */
    i=snprintf(buf, sizeof buf-1, "%s:",
        priority>=0 && priority<=7 ? prio_names[priority] : "UNKNOWN"
    );

    /* write domain - if it is set. */
    if(domain)
        i+=snprintf(buf+i, sizeof buf-i-1, "%s:", domain);

    /* apply format string. */
    va_start(ap, fmt);
    i+=vsnprintf(buf+i, sizeof buf-i-1, fmt, ap);
    va_end(ap);

    /* add newline if one not found. */
    if(i && buf[i-1]!='\n') strcpy(buf+i, "\n");

    fputs(buf, stderr);
}

static int initialize(void) {
    fprintf(stderr, "loaded %s\n", plugin_class.base_class.class_name);
    service_attach_log(do_log);
    b_log(B_LOG_INFO, "logging", "Logging system loaded (" __FILE__ " compiled " __TIME__ " " __DATE__ ")");
    return 1;
}

static int shutdown(void) {
    service_detach_log(do_log);
    return 1;
}

static void set_level(int level) {
    if(level>7) level=7;
    if(level<0) level=0;
    log_level=level;
}

const struct plugin_basiclog_class plugin_class = {
    .base_class = { PLUGIN_API, "logging", initialize, shutdown },
    .log_interface = { do_log, set_level }
};

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