usr/src/lib/libuutil/common/uu_alloc.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  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #include "libuutil_common.h"
  26
  27 #include <stdarg.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 void *
  33 uu_zalloc(size_t n)
  34 {
  35         void *p = malloc(n);
  36
  37         if (p == NULL) {
  38                 uu_set_error(UU_ERROR_SYSTEM);
  39                 return (NULL);
  40         }
  41
  42         (void) memset(p, 0, n);
  43
  44         return (p);
  45 }
  46
  47 void
  48 uu_free(void *p)
  49 {
  50         free(p);
  51 }
  52
  53 char *
  54 uu_strdup(const char *str)
  55 {
  56         char *buf = NULL;
  57
  58         if (str != NULL) {
  59                 size_t sz;
  60
  61                 sz = strlen(str) + 1;
  62                 buf = uu_zalloc(sz);
  63                 if (buf != NULL)
  64                         (void) memcpy(buf, str, sz);
  65         }
  66         return (buf);
  67 }
  68
  69 /*
  70  * Duplicate up to n bytes of a string.  Kind of sort of like
  71  * strdup(strlcpy(s, n)).
  72  */
  73 char *
  74 uu_strndup(const char *s, size_t n)
  75 {
  76         size_t len;
  77         char *p;
  78
  79         len = strnlen(s, n);
  80         p = uu_zalloc(len + 1);
  81         if (p == NULL)
  82                 return (NULL);
  83
  84         if (len > 0)
  85                 (void) memcpy(p, s, len);
  86         p[len] = '\0';
  87
  88         return (p);
  89 }
  90
  91 /*
  92  * Duplicate a block of memory.  Combines malloc with memcpy, much as
  93  * strdup combines malloc, strlen, and strcpy.
  94  */
  95 void *
  96 uu_memdup(const void *buf, size_t sz)
  97 {
  98         void *p;
  99
 100         p = uu_zalloc(sz);
 101         if (p == NULL)
 102                 return (NULL);
 103         (void) memcpy(p, buf, sz);
 104         return (p);
 105 }
 106
 107 char *
 108 uu_msprintf(const char *format, ...)
 109 {
 110         va_list args;
 111         char attic[1];
 112         uint_t M, m;
 113         char *b;
 114
 115         va_start(args, format);
 116         M = vsnprintf(attic, 1, format, args);
 117         va_end(args);
 118
 119         for (;;) {
 120                 m = M;
 121                 if ((b = uu_zalloc(m + 1)) == NULL)
 122                         return (NULL);
 123
 124                 va_start(args, format);
 125                 M = vsnprintf(b, m + 1, format, args);
 126                 va_end(args);
 127
 128                 if (M == m)
 129                         break;          /* sizes match */
 130
 131                 uu_free(b);
 132         }
 133
 134         return (b);
 135 }