usr.sbin/netgroup_mkdb/str.c

   1 /*      $NetBSD: str.c,v 1.6 2006/08/26 18:15:37 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 1994 Christos Zoulas
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  17  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 #ifndef lint
  31 __RCSID("$NetBSD: str.c,v 1.6 2006/08/26 18:15:37 christos Exp $");
  32 #endif
  33
  34 /*
  35  * Counted strings
  36  */
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <err.h>
  40 #include <util.h>
  41
  42 #include "str.h"
  43
  44 /*
  45  * str_init(): Initialize string
  46  */
  47 void
  48 str_init(struct string  *s)
  49 {
  50         s->s_str = NULL;
  51         s->s_len = 0;
  52 }
  53
  54
  55 /*
  56  * str_append(): Append string allocating buffer as necessary
  57  */
  58 void
  59 str_append(struct string  *buf, const char *str, int del)
  60 {
  61         size_t          len = strlen(str) + 1;
  62
  63         if (buf->s_str == NULL)
  64                 buf->s_str = emalloc(len);
  65         else {
  66                 buf->s_str = erealloc(buf->s_str, buf->s_len + len +
  67                                                   (del ? 2 : 1));
  68                 if (del)
  69                         buf->s_str[buf->s_len++] = del;
  70         }
  71
  72         memcpy(&buf->s_str[buf->s_len], str, len);
  73         buf->s_len += len - 1;
  74 }
  75
  76 /*
  77  * str_prepend(): Prepend string allocating buffer as necessary
  78  */
  79 void
  80 str_prepend(struct string *buf, const char *str, int del)
  81 {
  82         char           *ptr, *sptr;
  83         size_t          len = strlen(str) + 1;
  84
  85         sptr = ptr = emalloc(buf->s_len + len + (del ? 2 : 1));
  86
  87         if (del)
  88                 *ptr++ = del;
  89
  90         memcpy(ptr, str, len);
  91
  92         if (buf->s_str) {
  93                 memcpy(&ptr[len - 1], buf->s_str, buf->s_len + 1);
  94                 free(buf->s_str);
  95         }
  96
  97         buf->s_str = sptr;
  98         buf->s_len += del ? len : len - 1;
  99 }
 100
 101 /*
 102  * str_free(): Free a string
 103  */
 104 void
 105 str_free(struct string *s)
 106 {
 107         free(s->s_str);
 108         s->s_str = NULL;
 109         s->s_len = 0;
 110 }