msg_vstream.c

[詳解]

/*++
/* NAME
/*  msg_vstream 3
/* SUMMARY
/*  report diagnostics to VSTREAM
/* SYNOPSIS
/*  #include <msg_vstream.h>
/*
/*  void    msg_vstream_init(progname, stream)
/*  const char *progname;
/*  VSTREAM *stream;
/* DESCRIPTION
/*  This module implements support to report msg(3) diagnostics
/*  to a VSTREAM.
/*
/*  msg_vstream_init() sets the program name that appears in each output
/*  record, and directs diagnostics (see msg(3)) to the specified
/*  VSTREAM. The \fIprogname\fR argument is not copied.
/* SEE ALSO
/*  msg(3)
/* BUGS
/*  No guarantee that long records are written atomically.
/*  Only the last msg_vstream_init() call takes effect.
/* LICENSE
/* .ad
/* .fi
/*  The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*  Wietse Venema
/*  IBM T.J. Watson Research
/*  P.O. Box 704
/*  Yorktown Heights, NY 10598, USA
/*--*/

/* System libraries. */

#include <sys_defs.h>
#include <errno.h>
#include <stdlib.h>         /* 44BSD stdarg.h uses abort() */
#include <stdarg.h>

/* Utility library. */

#include "vstream.h"
#include "msg.h"
#include "msg_output.h"
#include "msg_vstream.h"

 /*
  * Private state.
  */
static const char *msg_tag;
static VSTREAM *msg_stream;

/* msg_vstream_print - log diagnostic to VSTREAM */

static void msg_vstream_print(int level, const char *text)
{
    static const char *level_text[] = {
    "info", "warning", "error", "fatal", "panic",
    };

    if (level < 0 || level >= (int) (sizeof(level_text) / sizeof(level_text[0])))
    msg_panic("invalid severity level: %d", level);
    if (level == MSG_INFO) {
    vstream_fprintf(msg_stream, "%s: %s\n",
            msg_tag, text);
    } else {
    vstream_fprintf(msg_stream, "%s: %s: %s\n",
            msg_tag, level_text[level], text);
    }
    vstream_fflush(msg_stream);
}

/* msg_vstream_init - initialize */

void    msg_vstream_init(const char *name, VSTREAM *vp)
{
    static int first_call = 1;

    msg_tag = name;
    msg_stream = vp;
    if (first_call) {
    first_call = 0;
    msg_output(msg_vstream_print);
    }
}