116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
/* uconvert - convert string representations of decimal numbers into whole
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number/fractional value pairs. */
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/* Copyright (C) 2008,2009 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "bashtypes.h"
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#if defined (TIME_WITH_SYS_TIME)
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# include <sys/time.h>
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# include <time.h>
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#else
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# if defined (HAVE_SYS_TIME_H)
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#if defined (HAVE_UNISTD_H)
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#include <unistd.h>
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#endif
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#include <stdio.h>
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#include "chartypes.h"
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#include "shell.h"
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#include "builtins.h"
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#define DECIMAL '.' /* XXX - should use locale */
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#define RETURN(x) \
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do { \
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if (ip) *ip = ipart * mult; \
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if (up) *up = upart; \
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return (x); \
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} while (0)
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/*
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* An incredibly simplistic floating point converter.
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*/
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static int multiplier[7] = { 1, 100000, 10000, 1000, 100, 10, 1 };
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/* Take a decimal number int-part[.[micro-part]] and convert it to the whole
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and fractional portions. The fractional portion is returned in
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millionths (micro); callers are responsible for multiplying appropriately.
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Return 1 if value converted; 0 if invalid integer for either whole or
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fractional parts. */
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int
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uconvert(s, ip, up)
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char *s;
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long *ip, *up;
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{
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int n, mult;
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long ipart, upart;
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char *p;
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ipart = upart = 0;
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mult = 1;
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if (s && (*s == '-' || *s == '+'))
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{
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mult = (*s == '-') ? -1 : 1;
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p = s + 1;
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}
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else
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p = s;
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for ( ; p && *p; p++)
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{
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if (*p == DECIMAL) /* decimal point */
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break;
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if (DIGIT(*p) == 0)
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RETURN(0);
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ipart = (ipart * 10) + (*p - '0');
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}
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if (p == 0 || *p == 0) /* callers ensure p can never be 0; this is to shut up clang */
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RETURN(1);
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if (*p == DECIMAL)
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p++;
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/* Look for up to six digits past a decimal point. */
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for (n = 0; n < 6 && p[n]; n++)
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{
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if (DIGIT(p[n]) == 0)
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RETURN(0);
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upart = (upart * 10) + (p[n] - '0');
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}
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/* Now convert to millionths */
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upart *= multiplier[n];
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if (n == 6 && p[6] >= '5' && p[6] <= '9')
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upart++; /* round up 1 */
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RETURN(1);
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}
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