lib/libc/stdlib/strsuftoll.c

   1 /*      $NetBSD: strsuftoll.c,v 1.8 2008/04/28 20:23:00 martin Exp $    */
   2 /*-
   3  * Copyright (c) 2001-2002,2004 The NetBSD Foundation, Inc.
   4  * All rights reserved.
   5  *
   6  * This code is derived from software contributed to The NetBSD Foundation
   7  * by Luke Mewburn.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  */
  30 /*-
  31  * Copyright (c) 1991, 1993, 1994
  32  *      The Regents of the University of California.  All rights reserved.
  33  *
  34  * This code is derived from software contributed to Berkeley by
  35  * Keith Muller of the University of California, San Diego and Lance
  36  * Visser of Convex Computer Corporation.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  */
  62
  63 #if HAVE_NBTOOL_CONFIG_H
  64 #include "nbtool_config.h"
  65 #endif
  66
  67 #include <sys/cdefs.h>
  68
  69 #if defined(LIBC_SCCS) && !defined(lint)
  70 __RCSID("$NetBSD: strsuftoll.c,v 1.8 2008/04/28 20:23:00 martin Exp $");
  71 #endif /* LIBC_SCCS and not lint */
  72
  73 #ifdef _LIBC
  74 #include "namespace.h"
  75 #endif
  76
  77 #if !HAVE_STRSUFTOLL
  78
  79 #include <sys/types.h>
  80 #include <sys/time.h>
  81
  82 #include <assert.h>
  83 #include <ctype.h>
  84 #include <err.h>
  85 #include <errno.h>
  86 #include <limits.h>
  87 #include <stdio.h>
  88 #include <stdlib.h>
  89 #include <string.h>
  90
  91 #ifdef _LIBC
  92 # ifdef __weak_alias
  93 __weak_alias(strsuftoll, _strsuftoll)
  94 __weak_alias(strsuftollx, _strsuftollx)
  95 # endif
  96 #endif /* LIBC */
  97
  98 /*
  99  * Convert an expression of the following forms to a (u)int64_t.
 100  *      1) A positive decimal number.
 101  *      2) A positive decimal number followed by a b (mult by 512).
 102  *      3) A positive decimal number followed by a k (mult by 1024).
 103  *      4) A positive decimal number followed by a m (mult by 1048576).
 104  *      5) A positive decimal number followed by a g (mult by 1073741824).
 105  *      6) A positive decimal number followed by a t (mult by 1099511627776).
 106  *      7) A positive decimal number followed by a w (mult by sizeof int)
 107  *      8) Two or more positive decimal numbers (with/without k,b or w).
 108  *         separated by x (also * for backwards compatibility), specifying
 109  *         the product of the indicated values.
 110  * Returns the result upon successful conversion, or exits with an
 111  * appropriate error.
 112  *
 113  */
 114 /* LONGLONG */
 115 long long
 116 strsuftoll(const char *desc, const char *val,
 117     long long min, long long max)
 118 {
 119         long long result;
 120         char    errbuf[100];
 121
 122         result = strsuftollx(desc, val, min, max, errbuf, sizeof(errbuf));
 123         if (*errbuf != '\0')
 124                 errx(1, "%s", errbuf);
 125         return (result);
 126 }
 127
 128 /*
 129  * As strsuftoll(), but returns the error message into the provided buffer
 130  * rather than exiting with it.
 131  */
 132 /* LONGLONG */
 133 long long
 134 strsuftollx(const char *desc, const char *val,
 135     long long min, long long max, char *ebuf, size_t ebuflen)
 136 {
 137         long long num, t;
 138         char    *expr;
 139
 140         _DIAGASSERT(desc != NULL);
 141         _DIAGASSERT(val != NULL);
 142         _DIAGASSERT(ebuf != NULL);
 143
 144         errno = 0;
 145         ebuf[0] = '\0';
 146
 147         while (isspace((unsigned char)*val))    /* Skip leading space */
 148                 val++;
 149
 150         num = strtoll(val, &expr, 10);
 151         if (errno == ERANGE)
 152                 goto erange;                    /* Overflow */
 153
 154         if (expr == val)                        /* No digits */
 155                 goto badnum;
 156
 157         switch (*expr) {
 158         case 'b':
 159                 t = num;
 160                 num *= 512;                     /* 1 block */
 161                 if (t > num)
 162                         goto erange;
 163                 ++expr;
 164                 break;
 165         case 'k':
 166                 t = num;
 167                 num *= 1024;                    /* 1 kibibyte */
 168                 if (t > num)
 169                         goto erange;
 170                 ++expr;
 171                 break;
 172         case 'm':
 173                 t = num;
 174                 num *= 1048576;                 /* 1 mebibyte */
 175                 if (t > num)
 176                         goto erange;
 177                 ++expr;
 178                 break;
 179         case 'g':
 180                 t = num;
 181                 num *= 1073741824;              /* 1 gibibyte */
 182                 if (t > num)
 183                         goto erange;
 184                 ++expr;
 185                 break;
 186         case 't':
 187                 t = num;
 188                 num *= 1099511627776LL;         /* 1 tebibyte */
 189                 if (t > num)
 190                         goto erange;
 191                 ++expr;
 192                 break;
 193         case 'w':
 194                 t = num;
 195                 num *= sizeof(int);             /* 1 word */
 196                 if (t > num)
 197                         goto erange;
 198                 ++expr;
 199                 break;
 200         }
 201
 202         switch (*expr) {
 203         case '\0':
 204                 break;
 205         case '*':                               /* Backward compatible */
 206         case 'x':
 207                 t = num;
 208                 num *= strsuftollx(desc, expr + 1, min, max, ebuf, ebuflen);
 209                 if (*ebuf != '\0')
 210                         return (0);
 211                 if (t > num) {
 212  erange:
 213                         snprintf(ebuf, ebuflen,
 214                             "%s: %s", desc, strerror(ERANGE));
 215                         return (0);
 216                 }
 217                 break;
 218         default:
 219  badnum:        snprintf(ebuf, ebuflen,
 220                     "%s `%s': illegal number", desc, val);
 221                 return (0);
 222         }
 223         if (num < min) {
 224                         /* LONGLONG */
 225                 snprintf(ebuf, ebuflen, "%s %lld is less than %lld.",
 226                     desc, (long long)num, (long long)min);
 227                 return (0);
 228         }
 229         if (num > max) {
 230                         /* LONGLONG */
 231                 snprintf(ebuf, ebuflen,
 232                     "%s %lld is greater than %lld.",
 233                     desc, (long long)num, (long long)max);
 234                 return (0);
 235         }
 236         *ebuf = '\0';
 237         return (num);
 238 }
 239
 240 #endif /* !HAVE_STRSUFTOLL */