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98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
/* temphelper.c: aid in converting temperature units
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*
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* Copyright (C) 2008 Phil Sutter <Phil@nwl.cc>
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*
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* This library 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 2 of the License, or
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* (at your option) any later version.
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*
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* This library 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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*
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* You should have received a copy of the GNU General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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* USA.
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*
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include "temphelper.h"
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#include "conky.h"
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/* default to output in celsius */
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static enum TEMP_UNIT output_unit = TEMP_CELSIUS;
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static double
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fahrenheit_to_celsius(double n)
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{
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return ((n - 32) * 5 / 9);
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}
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static double
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celsius_to_fahrenheit(double n)
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{
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return ((n * 9 / 5) + 32);
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}
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int
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set_temp_output_unit(const char *name)
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{
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size_t i;
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int rc = 0;
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char *buf;
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if (!name)
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return 1;
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buf = strdup(name);
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#ifdef HAVE_OPENMP
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#pragma omp parallel for
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#endif /* HAVE_OPENMP */
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for (i = 0; i < strlen(name); i++)
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buf[i] = tolower(name[i]);
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if (!strcmp(buf, "celsius"))
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output_unit = TEMP_CELSIUS;
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else if (!strcmp(buf, "fahrenheit"))
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output_unit = TEMP_FAHRENHEIT;
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else
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rc = 1;
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free(buf);
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return rc;
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}
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static double
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convert_temp_output(double n, enum TEMP_UNIT input_unit)
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{
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if (input_unit == output_unit)
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return n;
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switch(output_unit) {
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case TEMP_CELSIUS:
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return fahrenheit_to_celsius(n);
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case TEMP_FAHRENHEIT:
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return celsius_to_fahrenheit(n);
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}
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/* NOT REACHED */
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return 0.0;
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}
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int temp_print(char *p, size_t p_max_size, double n, enum TEMP_UNIT input_unit)
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{
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int out;
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size_t plen;
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out = round_to_int_temp(convert_temp_output(n, input_unit));
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plen = spaced_print(p, p_max_size, "%d", 3, out);
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return !(plen >= p_max_size);
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}
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