/*
* vii - buffer and display output
* Copyright (C) 1991-1995, 1999, 2005 Peter Miller
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* MANIFEST: functions to report errors
*/
#include <ac/ctype.h>
#include <ac/errno.h>
#include <ac/stddef.h>
#include <ac/stdio.h>
#include <ac/stdlib.h>
#include <ac/string.h>
#include <grp.h>
#include <pwd.h>
#include <ac/unistd.h>
#include <ac/stdarg.h>
#include <arglex.h>
#include <error.h>
#include <mprintf.h>
#include <option.h>
static void error_get_id _((int *, int *));
static void
error_get_id(uid, gid)
int *uid;
int *gid;
{
*uid = geteuid();
*gid = getegid();
}
static error_id_ty errid = error_get_id;
void
error_set_id_func(f)
error_id_ty f;
{
if (f)
errid = f;
else
errid = error_get_id;
}
/*
* NAME
* wrap - wrap s string over lines
*
* SYNOPSIS
* void wrap(char *);
*
* DESCRIPTION
* The wrap function is used to print error messages onto stderr
* wrapping ling lines.
*
* CAVEATS
* Line length is assumed to be 80 characters.
*/
static void wrap _((char *));
static void
wrap(s)
char *s;
{
char *progname;
static char escapes[] = "\rr\nn\ff\bb\tt";
int page_width;
char tmp[MAX_PAGE_WIDTH + 2];
int first_line;
char *tp;
if (fflush(stdout) || ferror(stdout))
nfatal("(stdout)");
/* don't use last column, many terminals are dumb */
page_width = option_page_width_get() - 1;
progname = option_progname_get();
first_line = 1;
while (*s)
{
char *ep;
int ocol;
/*
* Work out how many characters fit on the line.
*/
if (first_line)
ocol = strlen(progname) + 2;
else
ocol = 8;
for (ep = s; *ep; ++ep)
{
int cw;
int c;
c = (unsigned char)*ep;
if (isprint(c))
cw = 1 + (c == '\\');
else
cw = (strchr(escapes, c) ? 2 : 4);
if (ocol + cw > page_width)
break;
ocol += cw;
}
/*
* see if there is a better place to break the line
*/
if (*ep && *ep != ' ')
{
char *mp;
for (mp = ep; mp > s; --mp)
{
if (strchr(" /", mp[-1]))
{
ep = mp;
break;
}
}
}
/*
* ignore trailing blanks
*/
while (ep > s && ep[-1] == ' ')
ep--;
/*
* print the line
*/
if (first_line)
sprintf(tmp, "%s: ", progname);
else
strcpy(tmp, "\t");
tp = tmp + strlen(tmp);
while (s < ep)
{
int c;
c = (unsigned char)*s++;
if (isprint(c))
{
if (c == '\\')
*tp++ = '\\';
*tp++ = c;
}
else
{
char *esc;
esc = strchr(escapes, c);
if (esc)
{
*tp++ = '\\';
*tp++ = esc[1];
}
else
{
sprintf(tp, "\\%3.3o", c);
tp += strlen(tp);
}
}
}
*tp++ = '\n';
*tp = 0;
fputs(tmp, stderr);
if (ferror(stderr))
break;
/*
* skip leading spaces for subsequent lines
*/
while (*s == ' ')
s++;
first_line = 0;
}
if (fflush(stderr) || ferror(stderr))
nfatal("(stderr)");
}
static void double_jeopardy _((void));
static void
double_jeopardy()
{
char buffer[200];
sprintf
(
buffer,
"while attempting to construct an error message: %s (fatal)",
strerror(errno)
);
wrap(buffer);
quit(1);
}
static char *copy_string _((char *));
static char *
copy_string(s)
char *s;
{
char *cp;
errno = 0;
cp = malloc(strlen(s) + 1);
if (!cp)
{
if (!errno)
errno = ENOMEM;
double_jeopardy();
}
strcpy(cp, s);
return cp;
}
static char *id _((void));
static char *
id()
{
int uid;
struct passwd *pw;
char uidn[20];
int gid;
struct group *gr;
char gidn[20];
char buffer[100];
errid(&uid, &gid);
pw = getpwuid(uid);
if (pw)
sprintf(uidn, "user \"%.8s\"", pw->pw_name);
else
sprintf(uidn, "uid %d", uid);
gr = getgrgid(gid);
if (gr)
sprintf(gidn, "group \"%.8s\"", gr->gr_name);
else
sprintf(gidn, "gid %d", gid);
sprintf(buffer, " [%s, %s]", uidn, gidn);
return copy_string(buffer);
}
/*
* NAME
* error - place a message on the error stream
*
* SYNOPSIS
* void error(char *fmt, ...);
*
* DESCRIPTION
* Error places a message on the error output stream.
* The first argument is a printf-like format string,
* optionally followed by other arguments.
* The message will be prefixed by the program name and a colon,
* and will be terminated with a newline, automatically.
*
* CAVEAT
* Things like "error(filename)" blow up if the filename
* contains a '%' character.
*/
/*VARARGS1*/
void
error(fmt sva_last)
char *fmt;
sva_last_decl
{
va_list ap;
char *buffer;
sva_init(ap, fmt);
buffer = vmprintf_errok(fmt, ap);
va_end(ap);
if (!buffer)
double_jeopardy();
wrap(buffer);
}
/*
* NAME
* nerror - place a system fault message on the error stream
*
* SYNOPSIS
* void nerror(char *fmt, ...);
*
* DESCRIPTION
* Nerror places a message on the error output stream.
* The first argument is a printf-like format string,
* optionally followed by other arguments.
* The message will be prefixed by the program name and a colon,
* and will be terminated with a text description of the error
* indicated by the 'errno' global variable, automatically.
*
* CAVEAT
* Things like "nerror(filename)" blow up if the filename
* contains a '%' character.
*/
/*VARARGS1*/
void
nerror(fmt sva_last)
char *fmt;
sva_last_decl
{
char *s1;
char *s2;
va_list ap;
int n;
n = errno;
sva_init(ap, fmt);
s1 = vmprintf_errok(fmt, ap);
va_end(ap);
if (!s1)
double_jeopardy();
s1 = copy_string(s1);
if (n == EPERM || n == EACCES)
s2 = id();
else
s2 = copy_string("");
error("%s: %s%s", s1, strerror(n), s2);
free(s1);
free(s2);
}
/*
* NAME
* nfatal - place a system fault message on the error stream and exit
*
* SYNOPSIS
* void nfatal(char *fmt, ...);
*
* DESCRIPTION
* Nfatal places a message on the error output stream and exits.
* The first argument is a printf-like format string,
* optionally followed by other arguments.
* The message will be prefixed by the program name and a colon,
* and will be terminated with a text description of the error
* indicated by the 'errno' global variable, automatically.
*
* CAVEAT
* Things like "nfatal(filename)" blow up if the filename
* contains a '%' character.
*
* This function does NOT return.
*/
/*VARARGS1*/
void
nfatal(fmt sva_last)
char *fmt;
sva_last_decl
{
char *s1;
char *s2;
va_list ap;
int n;
n = errno;
sva_init(ap, fmt);
s1 = vmprintf_errok(fmt, ap);
va_end(ap);
if (!s1)
double_jeopardy();
s1 = copy_string(s1);
if (n == EPERM || n == EACCES)
s2 = id();
else
s2 = "";
fatal("%s: %s%s", s1, strerror(n), s2);
}
/*
* NAME
* fatal - place a message on the error stream and exit
*
* SYNOPSIS
* void fatal(char *fmt, ...);
*
* DESCRIPTION
* Fatal places a message on the error output stream and exits.
* The first argument is a printf-like format string,
* optionally followed by other arguments.
* The message will be prefixed by the program name and a colon,
* and will be terminated with a newline, automatically.
*
* CAVEAT
* Things like "error(filename)" blow up if the filename
* contains a '%' character.
*
* This function does NOT return.
*/
/*VARARGS1*/
void
fatal(fmt sva_last)
char *fmt;
sva_last_decl
{
va_list ap;
char *buffer;
sva_init(ap, fmt);
buffer = vmprintf_errok(fmt, ap);
va_end(ap);
if (!buffer)
double_jeopardy();
wrap(buffer);
quit(1);
}
/*
* NAME
* assert - make an assertion
*
* SYNOPSIS
* void assert(int condition);
*
* DESCRIPTION
* Assert is a handy tool for a programmer to guarantee the internal
* consistency of their program. If "-DDEBUG" is specified on
* the compiler's command line, then assert will generate code to verify
* the assertios made. If no DEBUG is defined, assertions will generate
* no code.
*
* CAVEAT
* If the assertion fails, a fatal diagnostic is issued.
*
* The #define's which control the compilation may be found in "error.h".
*
*/
int
assert_failed(s, file, line)
char *s;
char *file;
int line;
{
error("%s: %d: assertion \"%s\" failed (bug)", file, line, s);
abort();
exit(1); /* incase abort() comes back */
return 0; /* to silence lint */
}
/*
* NAME
* verbose - place a verbose message on the error stream
*
* SYNOPSIS
* void verbose(char *fmt, ...);
*
* DESCRIPTION
* The verbose function places a verbose message on the error stream.
* The first argument is a printf-like format string,
* optionally followed by other arguments.
* The message will be prefixed by the program name and a colon,
* and will be terminated with a newline, automatically.
*
* CAVEAT
* Things like "verbose(filename)" blow up if the filename
* contains a '%' character.
*/
/*VARARGS1*/
void
verbose(fmt sva_last)
char *fmt;
sva_last_decl
{
va_list ap;
char *buffer;
sva_init(ap, fmt);
buffer = vmprintf_errok(fmt, ap);
va_end(ap);
if (!buffer)
double_jeopardy();
if (option_verbose_get())
wrap(buffer);
}
/*
* NAME
* signal_name - find it
*
* SYNOPSIS
* char *signal_name(int n);
*
* DESCRIPTION
* The signal_name function is used to find the name of a signal from its
* number.
*
* RETURNS
* char *: pointer to the signal name.
*
* CAVEAT
* The signal name may not be written on. Subsequent calls may alter the
* area pointed to.
*/
char *
signal_name(n)
int n;
{
static char buffer[16];
switch (n)
{
#ifdef SIGHUP
case SIGHUP:
return "hang up [SIGHUP]";
#endif /* SIGHUP */
#ifdef SIGINT
case SIGINT:
return "user interrupt [SIGINT]";
#endif /* SIGINT */
#ifdef SIGQUIT
case SIGQUIT:
return "user quit [SIGQUIT]";
#endif /* SIGQUIT */
#ifdef SIGILL
case SIGILL:
return "illegal instruction [SIGILL]";
#endif /* SIGILL */
#ifdef SIGTRAP
case SIGTRAP:
return "trace trap [SIGTRAP]";
#endif /* SIGTRAP */
#ifdef SIGIOT
case SIGIOT:
return "abort [SIGIOT]";
#endif /* SIGIOT */
#ifdef SIGEMT
case SIGEMT:
return "EMT instruction [SIGEMT]";
#endif /* SIGEMT */
#ifdef SIGFPE
case SIGFPE:
return "floating point exception [SIGFPE]";
#endif /* SIGFPE */
#ifdef SIGKILL
case SIGKILL:
return "kill [SIGKILL]";
#endif /* SIGKILL */
#ifdef SIGBUS
case SIGBUS:
return "bus error [SIGBUS]";
#endif /* SIGBUS */
#ifdef SIGSEGV
case SIGSEGV:
return "segmentation violation [SIGSEGV]";
#endif /* SIGSEGV */
#ifdef SIGSYS
case SIGSYS:
return "bad argument to system call [SIGSYS]";
#endif /* SIGSYS */
#ifdef SIGPIPE
case SIGPIPE:
return "write on a pipe with no one to read it [SIGPIPE]";
#endif /* SIGPIPE */
#ifdef SIGALRM
case SIGALRM:
return "alarm clock [SIGALRM]";
#endif /* SIGALRM */
#ifdef SIGTERM
case SIGTERM:
return "software termination [SIGTERM]";
#endif /* SIGTERM */
#ifdef SIGUSR1
case SIGUSR1:
return "user defined signal one [SIGUSR1]";
#endif /* SIGUSR1 */
#ifdef SIGUSR2
case SIGUSR2:
return "user defined signal two [SIGUSR2]";
#endif /* SIGUSR2 */
#ifdef SIGCLD
case SIGCLD:
return "death of child [SIGCLD]";
#endif /* SIGCLD */
#ifdef SIGPWR
case SIGPWR:
return "power failure [SIGPWR]";
#endif /* SIGPWR */
default:
sprintf(buffer, "signal %d", n);
return buffer;
}
}
static quit_ty quit_list[10];
static int quit_list_len;
void
quit_register(func)
quit_ty func;
{
assert(quit_list_len < SIZEOF(quit_list));
assert(func);
quit_list[quit_list_len++] = func;
}
void
quit(n)
int n;
{
int j;
static int quitting;
if (quitting > 4)
{
fprintf
(
stderr,
"%s: incorrectly handled error while quitting (bug)\n",
option_progname_get()
);
exit(1);
}
++quitting;
for (j = quit_list_len - 1; j >= 0; --j)
quit_list[j](n);
exit(n);
}
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