X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fstrutil.c;h=30e992b815468e5a86c1210652b3a19aece2720b;hb=4f0463a079f61ca60ac94a126a5a9cd0f40c14f3;hp=d817e642d8f1cb9dfb44292c9ea0d8acf11f73af;hpb=89b3a0d8d1cd44e3959a5c332954f34d6e9bd685;p=libsigrok.git
diff --git a/src/strutil.c b/src/strutil.c
index d817e642..30e992b8 100644
--- a/src/strutil.c
+++ b/src/strutil.c
@@ -14,8 +14,7 @@
* 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
+ * along with this program; if not, see .
*/
#include
@@ -24,6 +23,7 @@
#include
#include
#include
+#include
#include
#include "libsigrok-internal.h"
@@ -169,6 +169,38 @@ SR_PRIV int sr_atof(const char *str, float *ret)
return SR_OK;
}
+/**
+ * @private
+ *
+ * Convert a string representation of a numeric value to a double. The
+ * conversion is strict and will fail if the complete string does not represent
+ * a valid double. The function sets errno according to the details of the
+ * failure. This version ignores the locale.
+ *
+ * @param str The string representation to convert.
+ * @param ret Pointer to double where the result of the conversion will be stored.
+ *
+ * @retval SR_OK Conversion successful.
+ * @retval SR_ERR Failure.
+ */
+SR_PRIV int sr_atod_ascii(const char *str, double *ret)
+{
+ double tmp;
+ char *endptr = NULL;
+
+ errno = 0;
+ tmp = g_ascii_strtod(str, &endptr);
+
+ if (!endptr || *endptr || errno) {
+ if (!errno)
+ errno = EINVAL;
+ return SR_ERR;
+ }
+
+ *ret = tmp;
+ return SR_OK;
+}
+
/**
* @private
*
@@ -211,6 +243,84 @@ SR_PRIV int sr_atof_ascii(const char *str, float *ret)
return SR_OK;
}
+/**
+ * Convert a string representation of a numeric value to a sr_rational.
+ *
+ * The conversion is strict and will fail if the complete string does not
+ * represent a valid number. The function sets errno according to the details
+ * of the failure. This version ignores the locale.
+ *
+ * @param str The string representation to convert.
+ * @param ret Pointer to sr_rational where the result of the conversion will be stored.
+ *
+ * @retval SR_OK Conversion successful.
+ * @retval SR_ERR Failure.
+ *
+ * @since 0.5.0
+ */
+SR_API int sr_parse_rational(const char *str, struct sr_rational *ret)
+{
+ char *endptr = NULL;
+ int64_t integral;
+ int64_t fractional = 0;
+ int64_t denominator = 1;
+ int32_t fractional_len = 0;
+ int32_t exponent = 0;
+ bool is_negative = false;
+
+ errno = 0;
+ integral = g_ascii_strtoll(str, &endptr, 10);
+
+ if (str == endptr && (str[0] == '-' || str[0] == '+') && str[1] == '.')
+ endptr += 1;
+ else if (errno)
+ return SR_ERR;
+
+ if (integral < 0 || str[0] == '-')
+ is_negative = true;
+
+ if (*endptr == '.') {
+ const char* start = endptr + 1;
+ fractional = g_ascii_strtoll(start, &endptr, 10);
+ if (errno)
+ return SR_ERR;
+ fractional_len = endptr - start;
+ }
+
+ if ((*endptr == 'E') || (*endptr == 'e')) {
+ exponent = g_ascii_strtoll(endptr + 1, &endptr, 10);
+ if (errno)
+ return SR_ERR;
+ }
+
+ if (*endptr != '\0')
+ return SR_ERR;
+
+ for (int i = 0; i < fractional_len; i++)
+ integral *= 10;
+ exponent -= fractional_len;
+
+ if (!is_negative)
+ integral += fractional;
+ else
+ integral -= fractional;
+
+ while (exponent > 0) {
+ integral *= 10;
+ exponent--;
+ }
+
+ while (exponent < 0) {
+ denominator *= 10;
+ exponent++;
+ }
+
+ ret->p = integral;
+ ret->q = denominator;
+
+ return SR_OK;
+}
+
/**
* Convert a numeric value value to its "natural" string representation
* in SI units.
@@ -276,43 +386,50 @@ SR_API char *sr_samplerate_string(uint64_t samplerate)
}
/**
- * Convert a numeric frequency value to the "natural" string representation
- * of its period.
+ * Convert a numeric period value to the "natural" string representation
+ * of its period value.
+ *
+ * The period is specified as a rational number's numerator and denominator.
*
- * E.g. a value of 3000000 would be converted to "3 us", 20000 to "50 ms".
+ * E.g. a pair of (1, 5) would be converted to "200 ms", (10, 100) to "100 ms".
*
- * @param frequency The frequency in Hz.
+ * @param v_p The period numerator.
+ * @param v_q The period denominator.
*
- * @return A newly allocated string representation of the frequency value,
+ * @return A newly allocated string representation of the period value,
* or NULL upon errors. The caller is responsible to g_free() the
* memory.
*
- * @since 0.1.0
+ * @since 0.5.0
*/
-SR_API char *sr_period_string(uint64_t frequency)
+SR_API char *sr_period_string(uint64_t v_p, uint64_t v_q)
{
- char *o;
- int r;
-
- /* Allocate enough for a uint64_t as string + " ms". */
- o = g_malloc0(30 + 1);
-
- if (frequency >= SR_GHZ(1))
- r = snprintf(o, 30, "%" PRIu64 " ns", frequency / 1000000000);
- else if (frequency >= SR_MHZ(1))
- r = snprintf(o, 30, "%" PRIu64 " us", frequency / 1000000);
- else if (frequency >= SR_KHZ(1))
- r = snprintf(o, 30, "%" PRIu64 " ms", frequency / 1000);
- else
- r = snprintf(o, 30, "%" PRIu64 " s", frequency);
-
- if (r < 0) {
- /* Something went wrong... */
- g_free(o);
- return NULL;
+ double freq, v;
+ int prec;
+
+ freq = 1 / ((double)v_p / v_q);
+
+ if (freq > SR_GHZ(1)) {
+ v = (double)v_p / v_q * 1000000000000.0;
+ prec = ((v - (uint64_t)v) < FLT_MIN) ? 0 : 3;
+ return g_strdup_printf("%.*f ps", prec, v);
+ } else if (freq > SR_MHZ(1)) {
+ v = (double)v_p / v_q * 1000000000.0;
+ prec = ((v - (uint64_t)v) < FLT_MIN) ? 0 : 3;
+ return g_strdup_printf("%.*f ns", prec, v);
+ } else if (freq > SR_KHZ(1)) {
+ v = (double)v_p / v_q * 1000000.0;
+ prec = ((v - (uint64_t)v) < FLT_MIN) ? 0 : 3;
+ return g_strdup_printf("%.*f us", prec, v);
+ } else if (freq > 1) {
+ v = (double)v_p / v_q * 1000.0;
+ prec = ((v - (uint64_t)v) < FLT_MIN) ? 0 : 3;
+ return g_strdup_printf("%.*f ms", prec, v);
+ } else {
+ v = (double)v_p / v_q;
+ prec = ((v - (uint64_t)v) < FLT_MIN) ? 0 : 3;
+ return g_strdup_printf("%.*f s", prec, v);
}
-
- return o;
}
/**
@@ -333,25 +450,12 @@ SR_API char *sr_period_string(uint64_t frequency)
*/
SR_API char *sr_voltage_string(uint64_t v_p, uint64_t v_q)
{
- int r;
- char *o;
-
- o = g_malloc0(30 + 1);
-
if (v_q == 1000)
- r = snprintf(o, 30, "%" PRIu64 "mV", v_p);
+ return g_strdup_printf("%" PRIu64 " mV", v_p);
else if (v_q == 1)
- r = snprintf(o, 30, "%" PRIu64 "V", v_p);
+ return g_strdup_printf("%" PRIu64 " V", v_p);
else
- r = snprintf(o, 30, "%gV", (float)v_p / (float)v_q);
-
- if (r < 0) {
- /* Something went wrong... */
- g_free(o);
- return NULL;
- }
-
- return o;
+ return g_strdup_printf("%g V", (float)v_p / (float)v_q);
}
/**
@@ -466,8 +570,13 @@ SR_API uint64_t sr_parse_timestring(const char *timestring)
/** @since 0.1.0 */
SR_API gboolean sr_parse_boolstring(const char *boolstr)
{
- if (!boolstr)
- return FALSE;
+ /*
+ * Complete absence of an input spec is assumed to mean TRUE,
+ * as in command line option strings like this:
+ * ...:samplerate=100k:header:numchannels=4:...
+ */
+ if (!boolstr || !*boolstr)
+ return TRUE;
if (!g_ascii_strncasecmp(boolstr, "true", 4) ||
!g_ascii_strncasecmp(boolstr, "yes", 3) ||