libsigrok/output/common.c

100 lines
2.8 KiB
C

/*
* This file is part of the sigrok project.
*
* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sigrok.h>
/**
* Convert a numeric samplerate value to its "natural" string representation.
*
* E.g. a value of 3000000 would be converted to "3 MHz", 20000 to "20 kHz".
*
* @param samplerate The samplerate in Hz.
* @return A malloc()ed string representation of the samplerate value,
* or NULL upon errors. The caller is responsible to free() the memory.
*/
char *sigrok_samplerate_string(uint64_t samplerate)
{
char *o;
int r;
o = malloc(30 + 1); /* Enough for a uint64_t as string + " GHz". */
if (o == NULL)
return NULL;
if (samplerate >= GHZ(1))
r = snprintf(o, 30, "%" PRIu64 " GHz", samplerate / 1000000000);
else if (samplerate >= MHZ(1))
r = snprintf(o, 30, "%" PRIu64 " MHz", samplerate / 1000000);
else if (samplerate >= KHZ(1))
r = snprintf(o, 30, "%" PRIu64 " kHz", samplerate / 1000);
else
r = snprintf(o, 30, "%" PRIu64 " Hz", samplerate);
if (r < 0) {
/* Something went wrong... */
free(o);
return NULL;
}
return o;
}
/**
* Convert a numeric samplerate value to the "natural" string representation
* of its period.
*
* E.g. a value of 3000000 would be converted to "3 us", 20000 to "50 ms".
*
* @param frequency The frequency in Hz.
* @return A malloc()ed string representation of the frequency value,
* or NULL upon errors. The caller is responsible to free() the memory.
*/
char *sigrok_period_string(uint64_t frequency)
{
char *o;
int r;
o = malloc(30 + 1); /* Enough for a uint64_t as string + " ms". */
if (o == NULL)
return NULL;
if (frequency >= GHZ(1))
r = snprintf(o, 30, "%" PRIu64 " ns", frequency / 1000000000);
else if (frequency >= MHZ(1))
r = snprintf(o, 30, "%" PRIu64 " us", frequency / 1000000);
else if (frequency >= KHZ(1))
r = snprintf(o, 30, "%" PRIu64 " ms", frequency / 1000);
else
r = snprintf(o, 30, "%" PRIu64 " s", frequency);
if (r < 0) {
/* Something went wrong... */
free(o);
return NULL;
}
return o;
}