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[svn] Rewrote the logging code.

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Published at <sxs1ywrf300.fsf@florida.arsdigita.de>.
This commit is contained in:
hniksic 2000-11-04 20:38:31 -08:00
parent c2c821b3c9
commit 366ad1d6d9
6 changed files with 322 additions and 72 deletions
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2
configure vendored
View File

@ -2150,7 +2150,7 @@ else
fi
done
for ac_func in strerror vsnprintf select signal symlink access isatty
for ac_func in strerror snprintf vsnprintf select signal symlink access isatty
do
echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
echo "configure:2157: checking for $ac_func" >&5

2
configure.in
View File

@ -162,7 +162,7 @@ dnl
AC_FUNC_ALLOCA
AC_CHECK_FUNCS(strdup strstr strcasecmp strncasecmp)
AC_CHECK_FUNCS(gettimeofday mktime strptime)
AC_CHECK_FUNCS(strerror vsnprintf select signal symlink access isatty)
AC_CHECK_FUNCS(strerror snprintf vsnprintf select signal symlink access isatty)
AC_CHECK_FUNCS(uname gethostname)
AC_CHECK_FUNCS(gethostbyname, [], [

23
src/ChangeLog
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@ -1,3 +1,26 @@
2000-11-05 Hrvoje Niksic <hniksic@arsdigita.com>
* log.c (logvprintf): Use vsnprintf() in all cases. If necessary,
resize the buffer to fit the formated message. That way, messages
of arbitrary size may be printed.
(logvprintf): Use saved_append() to optionally log the last
several lines of output.
(logputs): Ditto.
(log_close): Adapt to new data structures.
(log_dump): Ditto.
(redirect_output): Print messages to stderr, not to stdout.
* log.c (saved_append_1): New function. Replaces the old logging
system ("log all output until 10M characters") with a new, much
more reasonable one ("log last screenful of text").
(saved_append): New function; call saved_append_1.
(free_log_line): New function.
2000-11-05 Hrvoje Niksic <hniksic@arsdigita.com>
* url.c (construct): Fix comment.
(find_last_char): Document.
2000-11-04 Hrvoje Niksic <hniksic@arsdigita.com>
* snprintf.c: New file.

3
src/config.h.in
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@ -119,6 +119,9 @@ char *alloca ();
/* Define if you have the strerror function. */
#undef HAVE_STRERROR
/* Define if you have the snprintf function. */
#undef HAVE_SNPRINTF
/* Define if you have the vsnprintf function. */
#undef HAVE_VSNPRINTF

353
src/log.c
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@ -44,26 +44,182 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifndef errno
extern int errno;
#endif
/* We expect no message passed to logprintf() to be bigger than this.
Before a message is printed, we make sure that at least this much
room is left for printing it. */
#define SAVED_LOG_MAXMSG 32768
/* Maximum allowed growing size. */
#define SAVED_LOG_MAXSIZE (10 * 1L << 20)
static char *saved_log;
/* Size of the current log. */
static long saved_log_size;
/* Offset into the log where we are about to print (size of the
used-up part of SAVED_LOG). */
static long saved_log_offset;
/* Whether logging is saved at all. */
int save_log_p;
/* The file descriptor used for logging. */
static FILE *logfp;
/* Whether logging is saved at all. */
int save_log_p;
/* In the event of a hang-up, and if its output was on a TTY, Wget
redirects its output to `wget-log'.
For the convenience of reading this newly-created log, we store the
last several lines ("screenful", hence the choice of 24) of Wget
output, and dump them as context when the time comes. */
#define SAVED_LOG_LINES 24
/* log_lines is a circular buffer that stores SAVED_LOG_LINES lines of
output. log_line_current always points to the position in the
buffer that will be written to next. When log_line_current reaches
SAVED_LOG_LINES, it is reset to zero.
The problem here is that we'd have to either (re)allocate and free
strings all the time, or limit the lines to an arbitrary number of
characters. Instead of settling for either of these, we do both:
if the line is smaller than a certain "usual" line length (80 chars
by default), a preallocated memory is used. The rare lines that
are longer than 80 characters are malloc'ed and freed separately.
This gives good performance with minimum memory consumption and
fragmentation. */
#define STATIC_LENGTH 80
static struct log_ln {
char static_line[STATIC_LENGTH + 1]; /* statically allocated
line. */
char *malloced_line; /* malloc'ed line, for lines of output
larger than 80 characters. */
char *content; /* this points either to malloced_line
or to the appropriate static_line.
If this is NULL, it means the line
has not yet been used. */
} log_lines[SAVED_LOG_LINES];
/* The current position in the ring. */
static int log_line_current = -1;
/* Whether the most recently written line was "trailing", i.e. did not
finish with \n. This is an important piece of information because
the code is always careful to append data to trailing lines, rather
than create new ones. */
static int trailing_line;
#define ROT_ADVANCE(num) do { \
if (++num >= SAVED_LOG_LINES) \
num = 0; \
} while (0)
/* Free the log line index with NUM. This calls free on
ln->malloced_line if it's non-NULL, and it also resets
ln->malloced_line and ln->content to NULL. */
static void
free_log_line (int num)
{
struct log_ln *ln = log_lines + num;
if (ln->malloced_line)
{
free (ln->malloced_line);
ln->malloced_line = NULL;
}
ln->content = NULL;
}
/* Append bytes in the range [start, end) to one line in the log. The
region is not supposed to contain newlines, except for the last
character (at end[-1]). */
static void
saved_append_1 (const char *start, const char *end)
{
int len = end - start;
if (!len)
return;
/* First, check whether we need to append to an existing line or to
create a new one. */
if (!trailing_line)
{
/* Create a new line. */
struct log_ln *ln;
if (log_line_current == -1)
log_line_current = 0;
else
free_log_line (log_line_current);
ln = log_lines + log_line_current;
if (len > STATIC_LENGTH)
{
ln->malloced_line = strdupdelim (start, end);
ln->content = ln->malloced_line;
}
else
{
memcpy (ln->static_line, start, len);
ln->static_line[len] = '\0';
ln->content = ln->static_line;
}
}
else
{
/* Append to the last line. If the line is malloc'ed, we just
call realloc and append the new string. If the line is
static, we have to check whether appending the new string
would make it exceed STATIC_LENGTH characters, and if so,
convert it to malloc(). */
struct log_ln *ln = log_lines + log_line_current;
if (ln->malloced_line)
{
/* Resize malloc'ed line and append. */
int old_len = strlen (ln->malloced_line);
ln->malloced_line = xrealloc (ln->malloced_line, old_len + len + 1);
memcpy (ln->malloced_line + old_len, start, len);
ln->malloced_line[old_len + len] = '\0';
/* might have changed due to realloc */
ln->content = ln->malloced_line;
}
else
{
int old_len = strlen (ln->static_line);
if (old_len + len > STATIC_LENGTH)
{
/* Allocate memory and concatenate the old and the new
contents. */
ln->malloced_line = xmalloc (old_len + len + 1);
memcpy (ln->malloced_line, ln->static_line,
old_len);
memcpy (ln->malloced_line + old_len, start, len);
ln->malloced_line[old_len + len] = '\0';
ln->content = ln->malloced_line;
}
else
{
/* Just append to the old, statically allocated
contents. */
memcpy (ln->static_line + old_len, start, len);
ln->static_line[old_len + len] = '\0';
ln->content = ln->static_line;
}
}
}
trailing_line = !(end[-1] == '\n');
if (!trailing_line)
ROT_ADVANCE (log_line_current);
}
/* Log the contents of S, as explained above. If S consists of
multiple lines, they are logged separately. If S does not end with
a newline, it will form a "trailing" line, to which things will get
appended the next time this function is called. */
static void
saved_append (const char *s)
{
while (*s)
{
const char *end = strchr (s, '\n');
if (!end)
end = s + strlen (s);
else
++end;
saved_append_1 (s, end);
s = end;
}
}
/* Check X against opt.verbose and opt.quiet. The semantics is as
follows:
@ -96,11 +252,15 @@ static FILE *logfp;
if (logfp == stdin) \
return; \
else if (!logfp) \
/* #### Should this ever happen? */ \
/* This might happen if somebody calls a */ \
/* log* function before log_init(). */ \
logfp = stderr; \
} while (0)
/* Log a literal string S. The string is logged as-is, without a
newline appended. */
void
logputs (enum log_options o, const char *s)
{
@ -110,22 +270,13 @@ logputs (enum log_options o, const char *s)
fputs (s, logfp);
if (!opt.no_flush)
fflush (logfp);
if (save_log_p && saved_log_size < SAVED_LOG_MAXSIZE)
{
int len = strlen (s);
/* Increase size of SAVED_LOG exponentially. */
DO_REALLOC (saved_log, saved_log_size,
saved_log_offset + len + 1, char);
memcpy (saved_log + saved_log_offset, s, len + 1);
saved_log_offset += len;
}
if (save_log_p)
saved_append (s);
}
/* Print a message to the log file logfp. If logfp is NULL, print to
stderr. If logfp is stdin, don't print at all. A copy of message
will be saved to saved_log, for later reusal by dump_log(). */
/* Print a message to the log. A copy of message will be saved to
saved_log, for later reusal by log_dump(). */
static void
logvprintf (enum log_options o, const char *fmt, va_list args)
{
@ -136,25 +287,67 @@ logvprintf (enum log_options o, const char *fmt, va_list args)
the message needs to be stored with vsprintf(). However, Watcom
C didn't like ARGS being used twice, so now we first vsprintf()
the message, and then fwrite() it to LOGFP. */
if (save_log_p && saved_log_size < SAVED_LOG_MAXSIZE)
if (!save_log_p)
{
int len;
/* Increase size of `saved_log' exponentially. */
DO_REALLOC (saved_log, saved_log_size,
saved_log_offset + SAVED_LOG_MAXMSG, char);
/* Print the message to the log saver... */
vsnprintf (saved_log + saved_log_offset, SAVED_LOG_MAXMSG, fmt, args);
/* ...and then dump it to LOGFP. */
len = strlen (saved_log + saved_log_offset);
fwrite (saved_log + saved_log_offset, len, 1, logfp);
saved_log_offset += len;
/* If we ran off the limits and corrupted something, bail out
immediately. */
assert (saved_log_size >= saved_log_offset);
/* In the simple case just call vfprintf(), to avoid needless
allocation and games with vsnprintf(). */
vfprintf (logfp, fmt, args);
}
else
vfprintf (logfp, fmt, args);
{
char smallmsg[128];
char *bigmsg = NULL;
int available_size = sizeof (smallmsg);
char *write_ptr = smallmsg;
while (1)
{
/* The GNU coding standards advise not to rely on the return
value of sprintf(). However, vsnprintf() is a relatively
new function missing from legacy systems. Therefore it's
safe to assume that its return value is meaningful. On
the systems where vsnprintf() is not available, we use
the implementation from snprintf.c which does return the
correct value. */
int numwritten = vsnprintf (write_ptr, available_size, fmt, args);
/* vsnprintf() will not step over the limit given by
available_size. If it fails, it will return either -1
(POSIX?) or the number of characters that *would have*
been written, if there had been enough room. In the
former case, we double the available_size and malloc() to
get a larger buffer, and try again. In the latter case,
we use the returned information to build a buffer of the
correct size. */
if (numwritten == -1)
{
/* Writing failed, and we don't know the needed size.
Try again with doubled size. */
available_size <<= 1;
bigmsg = xrealloc (bigmsg, available_size);
write_ptr = bigmsg;
}
else if (numwritten >= available_size)
{
/* Writing failed, but we know exactly how much space we
need. */
available_size = numwritten + 1;
bigmsg = xrealloc (bigmsg, available_size);
write_ptr = bigmsg;
}
else
{
/* Writing succeeded. */
break;
}
}
saved_append (write_ptr);
fputs (write_ptr, logfp);
if (bigmsg)
free (bigmsg);
}
if (!opt.no_flush)
fflush (logfp);
}
@ -167,7 +360,8 @@ logflush (void)
fflush (logfp);
}
/* Portability makes these two functions look like @#%#@$@#$. */
/* Portability with pre-ANSI compilers makes these two functions look
like @#%#@$@#$. */
#ifdef WGET_USE_STDARG
void
@ -242,7 +436,14 @@ log_init (const char *file, int appendp)
}
else
{
/* The log goes to stderr to avoid collisions with the output if
the user specifies `-O -'. #### Francois Pinard suggests
that it's a better idea to print to stdout by default, and to
stderr only if the user actually specifies `-O -'. He says
this inconsistency is harder to document, but is overall
easier on the user. */
logfp = stderr;
/* If the output is a TTY, enable logging, which will make Wget
remember all the printed messages, to be able to dump them to
a log file in case SIGHUP or SIGUSR1 is received (or
@ -263,30 +464,45 @@ log_init (const char *file, int appendp)
void
log_close (void)
{
fclose (logfp);
int i;
if (logfp != stdin)
fclose (logfp);
save_log_p = 0;
FREE_MAYBE (saved_log);
saved_log = NULL;
saved_log_size = saved_log_offset = 0;
for (i = 0; i < SAVED_LOG_LINES; i++)
free_log_line (i);
log_line_current = -1;
trailing_line = 0;
}
/* Dump SAVED_LOG using logprintf(), but quit further logging to memory.
Also, free the memory occupied by saved_log. */
/* Dump saved lines to logfp. */
static void
log_dump (void)
{
save_log_p = 0;
if (!saved_log)
int num = log_line_current;
FILE *fp = logfp;
if (num == -1)
return;
logputs (LOG_ALWAYS, saved_log);
free (saved_log);
saved_log = NULL;
saved_log_size = saved_log_offset = 0;
if (trailing_line)
ROT_ADVANCE (num);
do
{
struct log_ln *ln = log_lines + num;
if (ln->content)
fputs (ln->content, fp);
ROT_ADVANCE (num);
}
while (num != log_line_current);
if (trailing_line)
if (log_lines[log_line_current].content)
fputs (log_lines[log_line_current].content, fp);
fflush (fp);
}
/* Redirect output to `wget-log' if opt.lfile is stdout. MESSIJ is
printed on stdout, and should contain *exactly one* `%s', which
will be replaced by the log file name.
/* Redirect output to `wget-log'. MESSIJ is printed on stdout, and
should contain *exactly one* `%s', which will be replaced by the
log file name.
If logging was not enabled, MESSIJ will not be printed. */
void
@ -301,12 +517,15 @@ redirect_output (const char *messij)
logfp = fopen (logfile, "w");
if (!logfp)
{
printf ("%s: %s: %s\n", exec_name, logfile, strerror (errno));
/* `stdin' is magic to not print anything. */
/* Eek! Opening the alternate log file has failed. Nothing we
can do but disable printing completely. */
fprintf (stderr, "%s: %s: %s\n", exec_name, logfile, strerror (errno));
/* `stdin' is magic to not print anything, ever. */
logfp = stdin;
}
printf (messij, logfile);
fprintf (stderr, messij, logfile);
free (logfile);
/* Dump all the previous messages to LOGFILE. */
/* Dump the previous screenful of output to LOGFILE. */
log_dump ();
save_log_p = 0;
}

11
src/url.c
View File

@ -1311,6 +1311,10 @@ urlpath_length (const char *url)
return strlen (url);
}
/* Find the last occurrence of character C in the range [b, e), or
NULL, if none are present. This is almost completely equivalent to
{ *e = '\0'; return strrchr(b); }, except that it doesn't change
the contents of the string. */
static const char *
find_last_char (const char *b, const char *e, char c)
{
@ -1320,9 +1324,10 @@ find_last_char (const char *b, const char *e, char c)
return NULL;
}
/* Construct an absolute URL, given a (possibly) relative one. This
gets tricky if you want to cover all the "reasonable" cases, but
I'm satisfied with the result. */
/* Construct a URL by concatenating an absolute URL and a path, which
may or may not be absolute. This tries to behave "reasonably" in
all foreseeable cases. It employs little specific knowledge about
protocols or URL-specific stuff -- it just works on strings. */
static char *
construct (const char *url, const char *sub, int subsize, int no_proto)
{