contrib/libarchive/archive_string.c

   1 /*-
   2  * Copyright (c) 2003-2004 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "archive_platform.h"
  28 __FBSDID("$FreeBSD: src/lib/libarchive/archive_string.c,v 1.6 2004/12/22 06:12:40 kientzle Exp $");
  29
  30 /*
  31  * Basic resizable string support, to simplify manipulating arbitrary-sized
  32  * strings while minimizing heap activity.
  33  */
  34
  35 #include <stdlib.h>
  36 #include <string.h>
  37
  38 #include "archive_private.h"
  39 #include "archive_string.h"
  40
  41 struct archive_string *
  42 __archive_string_append(struct archive_string *as, const char *p, size_t s)
  43 {
  44         __archive_string_ensure(as, as->length + s + 1);
  45         memcpy(as->s + as->length, p, s);
  46         as->s[as->length + s] = 0;
  47         as->length += s;
  48         return (as);
  49 }
  50
  51 void
  52 __archive_string_free(struct archive_string *as)
  53 {
  54         as->length = 0;
  55         as->buffer_length = 0;
  56         if (as->s != NULL)
  57                 free(as->s);
  58 }
  59
  60 struct archive_string *
  61 __archive_string_ensure(struct archive_string *as, size_t s)
  62 {
  63         if (as->s && (s <= as->buffer_length))
  64                 return (as);
  65
  66         if (as->buffer_length < 32)
  67                 as->buffer_length = 32;
  68         while (as->buffer_length < s)
  69                 as->buffer_length *= 2;
  70         as->s = realloc(as->s, as->buffer_length);
  71         /* TODO: Return null instead and fix up all of our callers to
  72          * handle this correctly. */
  73         if (as->s == NULL)
  74                 __archive_errx(1, "Out of memory");
  75         return (as);
  76 }
  77
  78 struct archive_string *
  79 __archive_strncat(struct archive_string *as, const char *p, size_t n)
  80 {
  81         size_t s;
  82         const char *pp;
  83
  84         /* Like strlen(p), except won't examine positions beyond p[n]. */
  85         s = 0;
  86         pp = p;
  87         while (*pp && s < n) {
  88                 pp++;
  89                 s++;
  90         }
  91         return (__archive_string_append(as, p, s));
  92 }
  93
  94 struct archive_string *
  95 __archive_strappend_char(struct archive_string *as, char c)
  96 {
  97         return (__archive_string_append(as, &c, 1));
  98 }
  99
 100 struct archive_string *
 101 __archive_strappend_int(struct archive_string *as, int d, int base)
 102 {
 103         static const char *digits = "0123457890abcdef";
 104
 105         if (d < 0) {
 106                 __archive_strappend_char(as, '-');
 107                 d = -d;
 108         }
 109         if (d >= base)
 110                 __archive_strappend_int(as, d/base, base);
 111         __archive_strappend_char(as, digits[d % base]);
 112         return (as);
 113 }