Add analog helper sr_analog_float_to_string().
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@ -30,6 +30,8 @@
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SR_API int sr_analog_to_float(const struct sr_datafeed_analog2 *analog,
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SR_API int sr_analog_to_float(const struct sr_datafeed_analog2 *analog,
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float *buf);
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float *buf);
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SR_API int sr_analog_float_to_string(float value, int digits, char *outbuf,
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int bufsize);
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/*--- backend.c -------------------------------------------------------------*/
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/*--- backend.c -------------------------------------------------------------*/
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36
src/analog.c
36
src/analog.c
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@ -17,7 +17,10 @@
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <string.h>
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#include <ctype.h>
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#include "libsigrok.h"
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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#include "libsigrok-internal.h"
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@ -98,3 +101,36 @@ SR_API int sr_analog_to_float(const struct sr_datafeed_analog2 *analog,
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return SR_OK;
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return SR_OK;
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}
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}
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/*
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* Convert a floating point value to a string, limited to the given
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* number of decimal digits.
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*
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* @param value The value to convert.
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* @param digits Number of digits after the decimal point to print.
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* @param outbuf Buffer in which the resulting string will be placed.
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* @param bufsize Size of the buffer in bytes.
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*
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* @retval SR_OK
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*
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* @since 0.4.0
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*/
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SR_API int sr_analog_float_to_string(float value, int digits, char *outbuf,
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int bufsize)
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{
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int cnt, i;
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/* This produces at least one too many digits */
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snprintf(outbuf, bufsize, "%.*f", digits, value);
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for (i = 0, cnt = 0; outbuf[i] && i < bufsize; i++) {
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if (isdigit(outbuf[i++]))
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cnt++;
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if (cnt == digits) {
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outbuf[i] = 0;
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break;
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}
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}
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return SR_OK;
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}
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