usr/src/lib/libc/port/gen/addsev.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #pragma weak _addsev = addsev
  33
  34 #include "lint.h"
  35 #include "mtlib.h"
  36 #include "libc.h"
  37 #include <stdlib.h>
  38 #include <pfmt.h>
  39 #include <thread.h>
  40 #include "pfmt_data.h"
  41 #include <sys/types.h>
  42 #include <string.h>
  43 #include <synch.h>
  44
  45 int
  46 addsev(int severity, const char *string)
  47 {
  48         int i, firstfree;
  49         void *new;
  50
  51         /* Cannot redefine standard severity */
  52         if ((severity <= 4) || (severity > 255))
  53                 return (-1);
  54
  55         /* Locate severity in table */
  56         lrw_wrlock(&_rw_pfmt_sev_tab);
  57         for (i = 0, firstfree = -1; i < __pfmt_nsev; i++) {
  58                 if (__pfmt_sev_tab[i].severity == 0 && firstfree == -1)
  59                         firstfree = i;
  60                 if (__pfmt_sev_tab[i].severity == severity)
  61                         break;
  62         }
  63
  64         if (i == __pfmt_nsev) {
  65                 if (string == NULL)     /* Removing non-existing severity */
  66                         return (0);
  67                 if (firstfree != -1)    /* Re-use old entry */
  68                         i = firstfree;
  69                 else {
  70                         /* Allocate new entry */
  71                         new = libc_realloc(__pfmt_sev_tab,
  72                             sizeof (struct sev_tab) * (__pfmt_nsev + 1));
  73                         if (new == NULL) {
  74                                 lrw_unlock(&_rw_pfmt_sev_tab);
  75                                 return (-1);
  76                         }
  77                         __pfmt_nsev++;
  78                         __pfmt_sev_tab = new;
  79                 }
  80         }
  81         if (string == NULL) {
  82                 if (__pfmt_sev_tab[i].string)
  83                         libc_free(__pfmt_sev_tab[i].string);
  84                 __pfmt_sev_tab[i].severity = 0;
  85                 __pfmt_sev_tab[i].string = NULL;
  86                 lrw_unlock(&_rw_pfmt_sev_tab);
  87                 return (0);
  88         }
  89         new = libc_realloc(__pfmt_sev_tab[i].string, strlen(string) + 1);
  90         if (new == NULL) {
  91                 lrw_unlock(&_rw_pfmt_sev_tab);
  92                 return (-1);
  93         }
  94         __pfmt_sev_tab[i].severity = severity;
  95         __pfmt_sev_tab[i].string = new;
  96         (void) strcpy(__pfmt_sev_tab[i].string, string);
  97         lrw_unlock(&_rw_pfmt_sev_tab);
  98         return (0);
  99 }