100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
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* This file is part of the sigrok project.
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*
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* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
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*
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* This program 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 program 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 program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sigrok.h>
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/**
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* Convert a numeric samplerate value to its "natural" string representation.
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*
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* E.g. a value of 3000000 would be converted to "3 MHz", 20000 to "20 kHz".
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*
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* @param samplerate The samplerate in Hz.
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* @return A malloc()ed string representation of the samplerate value,
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* or NULL upon errors. The caller is responsible to free() the memory.
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*/
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char *sigrok_samplerate_string(uint64_t samplerate)
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{
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char *o;
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int r;
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o = malloc(30 + 1); /* Enough for a uint64_t as string + " GHz". */
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if (o == NULL)
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return NULL;
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if (samplerate >= GHZ(1))
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r = snprintf(o, 30, "%" PRIu64 " GHz", samplerate / 1000000000);
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else if (samplerate >= MHZ(1))
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r = snprintf(o, 30, "%" PRIu64 " MHz", samplerate / 1000000);
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else if (samplerate >= KHZ(1))
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r = snprintf(o, 30, "%" PRIu64 " kHz", samplerate / 1000);
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else
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r = snprintf(o, 30, "%" PRIu64 " Hz", samplerate);
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if (r < 0) {
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/* Something went wrong... */
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free(o);
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return NULL;
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}
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return o;
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}
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/**
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* Convert a numeric samplerate value to the "natural" string representation
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* of its period.
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*
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* E.g. a value of 3000000 would be converted to "3 us", 20000 to "50 ms".
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*
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* @param frequency The frequency in Hz.
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* @return A malloc()ed string representation of the frequency value,
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* or NULL upon errors. The caller is responsible to free() the memory.
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*/
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char *sigrok_period_string(uint64_t frequency)
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{
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char *o;
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int r;
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o = malloc(30 + 1); /* Enough for a uint64_t as string + " ms". */
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if (o == NULL)
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return NULL;
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if (frequency >= GHZ(1))
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r = snprintf(o, 30, "%" PRIu64 " ns", frequency / 1000000000);
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else if (frequency >= MHZ(1))
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r = snprintf(o, 30, "%" PRIu64 " us", frequency / 1000000);
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else if (frequency >= KHZ(1))
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r = snprintf(o, 30, "%" PRIu64 " ms", frequency / 1000);
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else
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r = snprintf(o, 30, "%" PRIu64 " s", frequency);
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if (r < 0) {
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/* Something went wrong... */
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free(o);
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return NULL;
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}
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return o;
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}
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