ihost/libukcprog/logf.c

/* logf.c -- Log file and error reporting routines. */

/* Copyright 1992 Godfrey Paul, University of Kent of Canterbury. */

char ukcprog_logf_sccsid[] = "$Id: logf.c,v 1.22 1999/07/15 11:10:21 djb1 Exp $ UKC";

#ifndef MSDOS
#include <sys/types.h>
#else
#include <sys/tk_types.h>
#endif

#include <fcntl.h>

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#ifdef __STDC__
#ifndef VMS
#include <unistd.h>
#endif /* VMS */
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#ifndef MSDOS
#ifndef __FreeBSD__
#ifndef linux
extern int sys_nerr, errno;
extern char *sys_errlist[];
#endif /* !linux */
#endif /* !__FreeBSD__ */
#endif /* !MSDOS */

#include "ukcprog.h"

static void write_logstr PROTO((const char *str, bool err));
static const char *get_errno_str PROTO((void));

static int Log_fd = 2;          /* just print to stderr by default */
static int Log_level = LG_INFO; /* by default */
static char *Log_prefix;        /* identification tag */
static int Log_prefix_len = 0;

/*  This is to avoid using %m in logf_set_ofile.  We should really make
 *  this public and use it in formf().
 */
static const char *
get_errno_str()
{
        static char buf[40];
                
        if (errno > 0 && errno < sys_nerr && *sys_errlist[errno] != '\0')
                return sys_errlist[errno];
        
        sprintf(buf, "[errno=%d (unknown value)]", errno);
        return buf;
}

int
logf_set_ofile(filename, prefix)
const char *filename, *prefix;
{
        static bool first_time = TRUE;
        int fd;

        if (filename != NULL) {
                if ((fd = open(filename, O_RDWR|O_APPEND|O_CREAT, 0666)) < 0) {
                        errf("Can't open logfile %s (%s)",
                             filename, get_errno_str());
                        return -1;
                }

                if (!first_time)
                        (void)close(Log_fd);
                else
                        first_time = FALSE;

                Log_fd = fd;
        }

        if (prefix != NULL) {
                if (Log_prefix != NULL)
                        free(Log_prefix);
                Log_prefix = strsave(prefix);
                Log_prefix_len = strlen(Log_prefix);
        }

        return 0;
}


static void
write_logstr(str, err)
const char *str;
bool err;
{
        time_t now;
        const char *errstr;

        if (Log_fd < 0) {
                fprintf(stderr, "%s: %s\n", errf_get_progname(), str);
                return;
        }

        now = time((time_t *)NULL);
        errstr = err ? " ERROR: " : " ";
        
        write(Log_fd, ctime(&now), sizeof("Fri Sep  9 15:10:00 ") - 1);
        write(Log_fd, Log_prefix, Log_prefix_len);
        write(Log_fd, errstr, strlen(errstr));
        write(Log_fd, str, strlen(str));
        write(Log_fd, "\n", 1);
}


#ifdef __STDC__
void
logf(int level, const char *fmt, ...)
{

#else /* !__STDC__ */
void
logf(va_alist)
va_dcl
{
        int level;
        char *fmt;
#endif /* !__STDC__ */
        va_list args;
        char buffer[100];
        char *s;

#ifdef __STDC__
        va_start(args, fmt);
#else
        va_start(args);
        level = va_arg(args, int);
        fmt = va_arg(args, char *);
#endif
        if (level < Log_level) {
                va_end(args);
                return;
        }

        s = formf(buffer, sizeof(buffer), fmt, args);
        va_end(args);
        write_logstr(s, FALSE);

        if (s != buffer)
                free(s);        /* allocated by formf() */
}

int
logf_set_level(new_level)
int new_level;
{
        int old;

        old = Log_level;
        Log_level = new_level;
        logf(LG_LOG, "Log level changed from %d to %d", old, new_level);

        return old;
}


void
logf_errf_ofunc(str)
const char *str;
{
        write_logstr(str, TRUE);
}
Revision:	1.1
Committed:	Fri Mar 8 14:37:29 2002 UTC (22 years, 6 months ago) by tdb
Content type:	text/plain
Branch:	MAIN
CVS Tags:	IHOST_1_5_3, IHOST_1_5_2, IHOST_1_5_1, IHOST_1_5, IHOST_1_0_RC1
Log Message:	I'm not usually up for putting third party sources in here, but in this case I'll make an exception. This is ukcprog, a set of useful C functions which the ihost plugins Pete's writing uses. It's got a pretty free license too. I've munged the Makefile around, as all it needs to do now is make the library, not install anything. The idea is to statically compile the other programs against this library, making the final binary independent of this code etc.
#	User	Rev	Content
1	tdb	1.1	/* logf.c -- Log file and error reporting routines. */
2
3			/* Copyright 1992 Godfrey Paul, University of Kent of Canterbury. */
4
5			char ukcprog_logf_sccsid[] = "$Id: logf.c,v 1.22 1999/07/15 11:10:21 djb1 Exp $ UKC";
6
7			#ifndef MSDOS
8			#include <sys/types.h>
9			#else
10			#include <sys/tk_types.h>
11			#endif
12
13			#include <fcntl.h>
14
15			#include <stdlib.h>
16			#include <stdio.h>
17			#include <string.h>
18			#include <time.h>
19			#include <errno.h>
20			#ifdef __STDC__
21			#ifndef VMS
22			#include <unistd.h>
23			#endif /* VMS */
24			#include <stdarg.h>
25			#else
26			#include <varargs.h>
27			#endif
28
29			#ifndef MSDOS
30			#ifndef __FreeBSD__
31			#ifndef linux
32			extern int sys_nerr, errno;
33			extern char *sys_errlist[];
34			#endif /* !linux */
35			#endif /* !__FreeBSD__ */
36			#endif /* !MSDOS */
37
38			#include "ukcprog.h"
39
40			static void write_logstr PROTO((const char *str, bool err));
41			static const char *get_errno_str PROTO((void));
42
43			static int Log_fd = 2; /* just print to stderr by default */
44			static int Log_level = LG_INFO; /* by default */
45			static char Log_prefix; / identification tag */
46			static int Log_prefix_len = 0;
47
48			/* This is to avoid using %m in logf_set_ofile. We should really make
49			* this public and use it in formf().
50			*/
51			static const char *
52			get_errno_str()
53			{
54			static char buf[40];
55
56			if (errno > 0 && errno < sys_nerr && *sys_errlist[errno] != '\0')
57			return sys_errlist[errno];
58
59			sprintf(buf, "[errno=%d (unknown value)]", errno);
60			return buf;
61			}
62
63			int
64			logf_set_ofile(filename, prefix)
65			const char filename, prefix;
66			{
67			static bool first_time = TRUE;
68			int fd;
69
70			if (filename != NULL) {
71			if ((fd = open(filename, O_RDWR\|O_APPEND\|O_CREAT, 0666)) < 0) {
72			errf("Can't open logfile %s (%s)",
73			filename, get_errno_str());
74			return -1;
75			}
76
77			if (!first_time)
78			(void)close(Log_fd);
79			else
80			first_time = FALSE;
81
82			Log_fd = fd;
83			}
84
85			if (prefix != NULL) {
86			if (Log_prefix != NULL)
87			free(Log_prefix);
88			Log_prefix = strsave(prefix);
89			Log_prefix_len = strlen(Log_prefix);
90			}
91
92			return 0;
93			}
94
95
96			static void
97			write_logstr(str, err)
98			const char *str;
99			bool err;
100			{
101			time_t now;
102			const char *errstr;
103
104			if (Log_fd < 0) {
105			fprintf(stderr, "%s: %s\n", errf_get_progname(), str);
106			return;
107			}
108
109			now = time((time_t *)NULL);
110			errstr = err ? " ERROR: " : " ";
111
112			write(Log_fd, ctime(&now), sizeof("Fri Sep 9 15:10:00 ") - 1);
113			write(Log_fd, Log_prefix, Log_prefix_len);
114			write(Log_fd, errstr, strlen(errstr));
115			write(Log_fd, str, strlen(str));
116			write(Log_fd, "\n", 1);
117			}
118
119
120			#ifdef __STDC__
121			void
122			logf(int level, const char *fmt, ...)
123			{
124
125			#else /* !__STDC__ */
126			void
127			logf(va_alist)
128			va_dcl
129			{
130			int level;
131			char *fmt;
132			#endif /* !__STDC__ */
133			va_list args;
134			char buffer[100];
135			char *s;
136
137			#ifdef __STDC__
138			va_start(args, fmt);
139			#else
140			va_start(args);
141			level = va_arg(args, int);
142			fmt = va_arg(args, char *);
143			#endif
144			if (level < Log_level) {
145			va_end(args);
146			return;
147			}
148
149			s = formf(buffer, sizeof(buffer), fmt, args);
150			va_end(args);
151			write_logstr(s, FALSE);
152
153			if (s != buffer)
154			free(s); /* allocated by formf() */
155			}
156
157			int
158			logf_set_level(new_level)
159			int new_level;
160			{
161			int old;
162
163			old = Log_level;
164			Log_level = new_level;
165			logf(LG_LOG, "Log level changed from %d to %d", old, new_level);
166
167			return old;
168			}
169
170
171			void
172			logf_errf_ofunc(str)
173			const char *str;
174			{
175			write_logstr(str, TRUE);
176			}