github.com/rohankumardubey/syslog-redirector-golang@v0.0.0-20140320174030-4859f03d829a/src/lib9/errstr.c (about)

     1  /*
     2  Plan 9 from User Space src/lib9/errstr.c
     3  http://code.swtch.com/plan9port/src/tip/src/lib9/errstr.c
     4  
     5  Copyright 2001-2007 Russ Cox.  All Rights Reserved.
     6  
     7  Permission is hereby granted, free of charge, to any person obtaining a copy
     8  of this software and associated documentation files (the "Software"), to deal
     9  in the Software without restriction, including without limitation the rights
    10  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    11  copies of the Software, and to permit persons to whom the Software is
    12  furnished to do so, subject to the following conditions:
    13  
    14  The above copyright notice and this permission notice shall be included in
    15  all copies or substantial portions of the Software.
    16  
    17  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    18  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    19  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
    20  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    21  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    22  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    23  THE SOFTWARE.
    24  */
    25  
    26  /*
    27   * We assume there's only one error buffer for the whole system.
    28   * If you use ffork, you need to provide a _syserrstr.  Since most
    29   * people will use libthread (which provides a _syserrstr), this is
    30   * okay.
    31   */
    32  
    33  #include <u.h>
    34  #include <errno.h>
    35  #include <string.h>
    36  #include <libc.h>
    37  
    38  enum
    39  {
    40  	EPLAN9 = 0x19283745
    41  };
    42  
    43  char *(*_syserrstr)(void);
    44  static char xsyserr[ERRMAX];
    45  static char*
    46  getsyserr(void)
    47  {
    48  	char *s;
    49  
    50  	s = nil;
    51  	if(_syserrstr)
    52  		s = (*_syserrstr)();
    53  	if(s == nil)
    54  		s = xsyserr;
    55  	return s;
    56  }
    57  
    58  int
    59  errstr(char *err, uint n)
    60  {
    61  	char tmp[ERRMAX];
    62  	char *syserr;
    63  
    64  	strecpy(tmp, tmp+ERRMAX, err);
    65  	rerrstr(err, n);
    66  	syserr = getsyserr();
    67  	strecpy(syserr, syserr+ERRMAX, tmp);
    68  	errno = EPLAN9;
    69  	return 0;
    70  }
    71  
    72  void
    73  rerrstr(char *err, uint n)
    74  {
    75  	char *syserr;
    76  
    77  	syserr = getsyserr();
    78  	if(errno == EINTR)
    79  		strcpy(syserr, "interrupted");
    80  	else if(errno != EPLAN9)
    81  		strcpy(syserr, strerror(errno));
    82  	strecpy(err, err+n, syserr);
    83  }
    84  
    85  /* replaces __errfmt in libfmt */
    86  
    87  int
    88  __errfmt(Fmt *f)
    89  {
    90  	if(errno == EPLAN9)
    91  		return fmtstrcpy(f, getsyserr());
    92  	return fmtstrcpy(f, strerror(errno));
    93  }
    94  
    95  void
    96  werrstr(char *fmt, ...)
    97  {
    98  	va_list arg;
    99  	char buf[ERRMAX];
   100  
   101  	va_start(arg, fmt);
   102  	vseprint(buf, buf+ERRMAX, fmt, arg);
   103  	va_end(arg);
   104  	errstr(buf, ERRMAX);
   105  }
   106