c3-lang/libbsd/src/expand_number.c

• Show log

  Commit

• Hash : 8e8834d8
  Author :
  Date : 2017-06-14T02:53:35
  

  Remove RCSID tags These are obsolete markers, and in some cases they repeat the information already present in the comment header.

Download

• src/expand_number.c

• /*-
   * Copyright (c) 2007 Eric Anderson <anderson@FreeBSD.org>
   * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <sys/cdefs.h>
  #include <sys/types.h>
  #include <ctype.h>
  #include <errno.h>
  #include <inttypes.h>
  #include <libutil.h>
  #include <stdint.h>
  
  /*
   * Convert an expression of the following forms to a uint64_t.
   *	1) A positive decimal number.
   *	2) A positive decimal number followed by a 'b' or 'B' (mult by 1).
   *	3) A positive decimal number followed by a 'k' or 'K' (mult by 1 << 10).
   *	4) A positive decimal number followed by a 'm' or 'M' (mult by 1 << 20).
   *	5) A positive decimal number followed by a 'g' or 'G' (mult by 1 << 30).
   *	6) A positive decimal number followed by a 't' or 'T' (mult by 1 << 40).
   *	7) A positive decimal number followed by a 'p' or 'P' (mult by 1 << 50).
   *	8) A positive decimal number followed by a 'e' or 'E' (mult by 1 << 60).
   */
  int
  expand_number(const char *buf, uint64_t *num)
  {
  	uint64_t number;
  	unsigned shift;
  	char *endptr;
  
  	number = strtoumax(buf, &endptr, 0);
  
  	if (endptr == buf) {
  		/* No valid digits. */
  		errno = EINVAL;
  		return (-1);
  	}
  
  	switch (tolower((unsigned char)*endptr)) {
  	case 'e':
  		shift = 60;
  		break;
  	case 'p':
  		shift = 50;
  		break;
  	case 't':
  		shift = 40;
  		break;
  	case 'g':
  		shift = 30;
  		break;
  	case 'm':
  		shift = 20;
  		break;
  	case 'k':
  		shift = 10;
  		break;
  	case 'b':
  	case '\0': /* No unit. */
  		*num = number;
  		return (0);
  	default:
  		/* Unrecognized unit. */
  		errno = EINVAL;
  		return (-1);
  	}
  
  	if ((number << shift) >> shift != number) {
  		/* Overflow */
  		errno = ERANGE;
  		return (-1);
  	}
  
  	*num = number << shift;
  	return (0);
  }
  

Download