8d99b9cebd
o Fix range error checking to detect overflow when uint64_t < uintmax_t. o Remove a non-functional check for no valid digits as pointed out by Bruce. o Remove a rather pointless comment describing what the function does. o Clean up a bunch of style bugs. Brucified by: bde
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/*-
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* Copyright (c) 2007 Eric Anderson <anderson@FreeBSD.org>
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* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <ctype.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <libutil.h>
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#include <stdint.h>
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int
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expand_number(const char *buf, uint64_t *num)
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{
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char *endptr;
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uintmax_t umaxval;
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uint64_t number;
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unsigned shift;
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int serrno;
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serrno = errno;
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errno = 0;
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umaxval = strtoumax(buf, &endptr, 0);
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if (umaxval > UINT64_MAX)
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errno = ERANGE;
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if (errno != 0)
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return (-1);
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errno = serrno;
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number = umaxval;
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switch (tolower((unsigned char)*endptr)) {
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case 'e':
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shift = 60;
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break;
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case 'p':
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shift = 50;
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break;
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case 't':
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shift = 40;
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break;
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case 'g':
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shift = 30;
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break;
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case 'm':
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shift = 20;
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break;
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case 'k':
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shift = 10;
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break;
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case 'b':
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case '\0': /* No unit. */
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*num = number;
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return (0);
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default:
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/* Unrecognized unit. */
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errno = EINVAL;
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return (-1);
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}
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if ((number << shift) >> shift != number) {
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/* Overflow */
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errno = ERANGE;
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return (-1);
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}
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*num = number << shift;
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return (0);
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}
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