usr.bin/sed/misc.c

   1 /*      $NetBSD: misc.c,v 1.15 2014/06/26 02:14:32 christos Exp $       */
   2
   3 /*-
   4  * Copyright (c) 1992 Diomidis Spinellis.
   5  * Copyright (c) 1992, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Diomidis Spinellis of Imperial College, University of London.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #if HAVE_NBTOOL_CONFIG_H
  37 #include "nbtool_config.h"
  38 #endif
  39
  40 #include <sys/cdefs.h>
  41 __RCSID("$NetBSD: misc.c,v 1.15 2014/06/26 02:14:32 christos Exp $");
  42 #ifdef __FBSDID
  43 __FBSDID("$FreeBSD: head/usr.bin/sed/misc.c 200462 2009-12-13 03:14:06Z delphij $");
  44 #endif
  45
  46 #if 0
  47 static const char sccsid[] = "@(#)misc.c        8.1 (Berkeley) 6/6/93";
  48 #endif
  49
  50 #include <sys/types.h>
  51
  52 #include <err.h>
  53 #include <limits.h>
  54 #include <regex.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58
  59 #include "defs.h"
  60 #include "extern.h"
  61
  62 /*
  63  * malloc with result test
  64  */
  65 void *
  66 xmalloc(size_t size)
  67 {
  68         void *p;
  69
  70         if ((p = malloc(size)) == NULL)
  71                 err(1, "malloc(%zu)", size);
  72         return p;
  73 }
  74
  75 /*
  76  * realloc with result test
  77  */
  78 void *
  79 xrealloc(void *p, size_t size)
  80 {
  81         if (p == NULL)                  /* Compatibility hack. */
  82                 return (xmalloc(size));
  83
  84         if ((p = realloc(p, size)) == NULL)
  85                 err(1, "realloc(%zu)", size);
  86         return p;
  87 }
  88
  89 /*
  90  * realloc with result test
  91  */
  92 void *
  93 xcalloc(size_t c, size_t n)
  94 {
  95         void *p;
  96
  97         if ((p = calloc(c, n)) == NULL)
  98                 err(1, "calloc(%zu, %zu)", c, n);
  99         return p;
 100 }
 101 /*
 102  * Return a string for a regular expression error passed.  This is overkill,
 103  * because of the silly semantics of regerror (we can never know the size of
 104  * the buffer).
 105  */
 106 char *
 107 strregerror(int errcode, regex_t *preg)
 108 {
 109         char buf[1];
 110         static char *oe;
 111         size_t s;
 112
 113         if (oe != NULL)
 114                 free(oe);
 115         s = regerror(errcode, preg, buf, 0);
 116         oe = xmalloc(s);
 117         (void)regerror(errcode, preg, oe, s);
 118         return (oe);
 119 }