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#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include "warnp.h"
static int initialized = 0;
static char * name = NULL;
static int use_syslog = 0;
static int syslog_priority = LOG_WARNING;
/* Free the name string and clean up writing to the syslog (if applicable). */
static void
warnp_atexit(void)
{
/* Clean up writing to the syslog (if applicable). */
if (use_syslog)
closelog();
free(name);
name = NULL;
}
/**
* warnp_setprogname(progname):
* Set the program name to be used by warn() and warnx() to ${progname}.
*/
void
warnp_setprogname(const char * progname)
{
const char * p;
/* Free the name if we already have one. */
free(name);
/* Find the last segment of the program name. */
for (p = progname; progname[0] != '\0'; progname++)
if (progname[0] == '/')
p = progname + 1;
/* Copy the name string. */
name = strdup(p);
/* If we haven't already done so, register our exit handler. */
if (initialized == 0) {
atexit(warnp_atexit);
initialized = 1;
}
}
/* This function will preserve errno. */
void
warn(const char * fmt, ...)
{
va_list ap;
char msgbuf[WARNP_SYSLOG_MAX_LINE + 1];
int saved_errno;
/* Save errno in case it gets clobbered. */
saved_errno = errno;
va_start(ap, fmt);
if (use_syslog == 0) {
#ifdef _MSC_VER
/* Print to stderr (no flockfile in Windows) */
fprintf(stderr, "%s", (name != NULL) ? name : "(unknown)");
if (fmt != NULL) {
fprintf(stderr, ": ");
vfprintf(stderr, fmt, ap);
}
fprintf(stderr, ": %s\n", strerror(saved_errno));
#else
/* Stop other threads writing to stderr. */
flockfile(stderr);
/* Print to stderr. */
fprintf(stderr, "%s", (name != NULL) ? name : "(unknown)");
if (fmt != NULL) {
fprintf(stderr, ": ");
vfprintf(stderr, fmt, ap);
}
fprintf(stderr, ": %s\n", strerror(saved_errno));
/* Allow other threads to write to stderr. */
funlockfile(stderr);
#endif
} else {
/* Print to syslog. */
if (fmt != NULL) {
/* No need to print "${name}: "; syslog does it. */
vsnprintf(msgbuf, WARNP_SYSLOG_MAX_LINE + 1, fmt, ap);
syslog(syslog_priority, "%s: %s\n", msgbuf,
strerror(saved_errno));
} else
syslog(syslog_priority, "%s\n", strerror(saved_errno));
}
va_end(ap);
/* Restore saved errno. */
errno = saved_errno;
}
/* This function will preserve errno. */
void
warnx(const char * fmt, ...)
{
va_list ap;
char msgbuf[WARNP_SYSLOG_MAX_LINE + 1];
int saved_errno;
/* Save errno in case it gets clobbered. */
saved_errno = errno;
va_start(ap, fmt);
if (use_syslog == 0) {
#ifdef _MSC_VER
/* Print to stderr (no flockfile in Windows) */
fprintf(stderr, "%s", (name != NULL) ? name : "(unknown)");
if (fmt != NULL) {
fprintf(stderr, ": ");
vfprintf(stderr, fmt, ap);
}
fprintf(stderr, "\n");
#else
/* Stop other threads writing to stderr. */
flockfile(stderr);
/* Print to stderr. */
fprintf(stderr, "%s", (name != NULL) ? name : "(unknown)");
if (fmt != NULL) {
fprintf(stderr, ": ");
vfprintf(stderr, fmt, ap);
}
fprintf(stderr, "\n");
/* Allow other threads to write to stderr. */
funlockfile(stderr);
#endif
} else {
/* Print to syslog. */
if (fmt != NULL) {
/* No need to print "${name}: "; syslog does it. */
vsnprintf(msgbuf, WARNP_SYSLOG_MAX_LINE + 1, fmt, ap);
syslog(syslog_priority, "%s\n", msgbuf);
} else
syslog(syslog_priority, "\n");
}
va_end(ap);
/* Restore saved errno. */
errno = saved_errno;
}
/**
* warnp_syslog(enable):
* Send future messages to syslog if ${enable} is non-zero. Messages to
* syslog will be truncated at WARNP_SYSLOG_MAX_LINE characters.
*/
void
warnp_syslog(int enable)
{
/* Clean up writing to the syslog (if applicable). */
if (use_syslog && !enable)
closelog();
use_syslog = enable;
}
/**
* warnp_syslog_priority(priority):
* Tag future syslog messages with priority ${priority}. Do not enable
* syslog messages; for that, use warnp_syslog().
*/
void
warnp_syslog_priority(int priority)
{
syslog_priority = priority;
}
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