libsigrok/strutil.c

454 lines
12 KiB
C

/*
* This file is part of the libsigrok 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 "libsigrok.h"
#include "libsigrok-internal.h"
/* Message logging helpers with subsystem-specific prefix string. */
#define LOG_PREFIX "strutil: "
#define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args)
#define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args)
#define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args)
#define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args)
#define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args)
#define sr_err(s, args...) sr_err(LOG_PREFIX s, ## args)
/**
* @file
*
* Helper functions for handling or converting libsigrok-related strings.
*/
/**
* @defgroup grp_strutil String utilities
*
* Helper functions for handling or converting libsigrok-related strings.
*
* @{
*/
/**
* Convert a numeric value value to its "natural" string representation
* in SI units.
*
* E.g. a value of 3000000, with units set to "W", would be converted
* to "3 MW", 20000 to "20 kW", 31500 would become "31.5 kW".
*
* @param x The value to convert.
* @param unit The unit to append to the string, or NULL if the string
* has no units.
*
* @return A g_try_malloc()ed string representation of the samplerate value,
* or NULL upon errors. The caller is responsible to g_free() the
* memory.
*/
SR_API char *sr_si_string_u64(uint64_t x, const char *unit)
{
uint8_t i;
uint64_t quot, divisor[] = {
SR_HZ(1), SR_KHZ(1), SR_MHZ(1), SR_GHZ(1),
SR_GHZ(1000), SR_GHZ(1000 * 1000), SR_GHZ(1000 * 1000 * 1000),
};
const char *p, prefix[] = "\0kMGTPE";
char fmt[8], fract[20] = "", *f;
if (unit == NULL)
unit = "";
for (i = 0; (quot = x / divisor[i]) >= 1000; i++);
if (i) {
sprintf(fmt, ".%%0%dlu", i * 3);
f = fract + sprintf(fract, fmt, x % divisor[i]) - 1;
while (f >= fract && strchr("0.", *f))
*f-- = 0;
}
p = prefix + i;
return g_strdup_printf("%" PRIu64 "%s %.1s%s", quot, fract, p, unit);
}
/**
* 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",
* 31500 would become "31.5 kHz".
*
* @param samplerate The samplerate in Hz.
*
* @return A g_try_malloc()ed string representation of the samplerate value,
* or NULL upon errors. The caller is responsible to g_free() the
* memory.
*/
SR_API char *sr_samplerate_string(uint64_t samplerate)
{
return sr_si_string_u64(samplerate, "Hz");
}
/**
* Convert a numeric frequency 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 g_try_malloc()ed string representation of the frequency value,
* or NULL upon errors. The caller is responsible to g_free() the
* memory.
*/
SR_API char *sr_period_string(uint64_t frequency)
{
char *o;
int r;
/* Allocate enough for a uint64_t as string + " ms". */
if (!(o = g_try_malloc0(30 + 1))) {
sr_err("%s: o malloc failed", __func__);
return NULL;
}
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;
}
return o;
}
/**
* Convert a numeric voltage value to the "natural" string representation
* of its voltage value. The voltage is specified as a rational number's
* numerator and denominator.
*
* E.g. a value of 300000 would be converted to "300mV", 2 to "2V".
*
* @param v_p The voltage numerator.
* @param v_q The voltage denominator.
*
* @return A g_try_malloc()ed string representation of the voltage value,
* or NULL upon errors. The caller is responsible to g_free() the
* memory.
*/
SR_API char *sr_voltage_string(uint64_t v_p, uint64_t v_q)
{
int r;
char *o;
if (!(o = g_try_malloc0(30 + 1))) {
sr_err("%s: o malloc failed", __func__);
return NULL;
}
if (v_q == 1000)
r = snprintf(o, 30, "%" PRIu64 "mV", v_p);
else if (v_q == 1)
r = snprintf(o, 30, "%" 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;
}
/**
* Parse a trigger specification string.
*
* @param sdi The device instance for which the trigger specification is
* intended. Must not be NULL. Also, sdi->driver and
* sdi->driver->info_get must not be NULL.
* @param triggerstring The string containing the trigger specification for
* one or more probes of this device. Entries for multiple probes are
* comma-separated. Triggers are specified in the form key=value,
* where the key is a probe number (or probe name) and the value is
* the requested trigger type. Valid trigger types currently
* include 'r' (rising edge), 'f' (falling edge), 'c' (any pin value
* change), '0' (low value), or '1' (high value).
* Example: "1=r,sck=f,miso=0,7=c"
*
* @return Pointer to a list of trigger types (strings), or NULL upon errors.
* The pointer list (if non-NULL) has as many entries as the
* respective device has probes (all physically available probes,
* not just enabled ones). Entries of the list which don't have
* a trigger value set in 'triggerstring' are NULL, the other entries
* contain the respective trigger type which is requested for the
* respective probe (e.g. "r", "c", and so on).
*/
SR_API char **sr_parse_triggerstring(const struct sr_dev_inst *sdi,
const char *triggerstring)
{
GSList *l;
GVariant *gvar;
struct sr_probe *probe;
int max_probes, probenum, i;
char **tokens, **triggerlist, *trigger, *tc;
const char *trigger_types;
gboolean error;
max_probes = g_slist_length(sdi->probes);
error = FALSE;
if (!(triggerlist = g_try_malloc0(max_probes * sizeof(char *)))) {
sr_err("%s: triggerlist malloc failed", __func__);
return NULL;
}
if (sdi->driver->config_list(SR_CONF_TRIGGER_TYPE,
&gvar, sdi, NULL) != SR_OK) {
sr_err("%s: Device doesn't support any triggers.", __func__);
return NULL;
}
trigger_types = g_variant_get_string(gvar, NULL);
tokens = g_strsplit(triggerstring, ",", max_probes);
for (i = 0; tokens[i]; i++) {
probenum = -1;
for (l = sdi->probes; l; l = l->next) {
probe = (struct sr_probe *)l->data;
if (probe->enabled
&& !strncmp(probe->name, tokens[i],
strlen(probe->name))) {
probenum = probe->index;
break;
}
}
if (probenum < 0 || probenum >= max_probes) {
sr_err("Invalid probe.");
error = TRUE;
break;
}
if ((trigger = strchr(tokens[i], '='))) {
for (tc = ++trigger; *tc; tc++) {
if (strchr(trigger_types, *tc) == NULL) {
sr_err("Unsupported trigger "
"type '%c'.", *tc);
error = TRUE;
break;
}
}
if (!error)
triggerlist[probenum] = g_strdup(trigger);
}
}
g_strfreev(tokens);
g_variant_unref(gvar);
if (error) {
for (i = 0; i < max_probes; i++)
g_free(triggerlist[i]);
g_free(triggerlist);
triggerlist = NULL;
}
return triggerlist;
}
/**
* Convert a "natural" string representation of a size value to uint64_t.
*
* E.g. a value of "3k" or "3 K" would be converted to 3000, a value
* of "15M" would be converted to 15000000.
*
* Value representations other than decimal (such as hex or octal) are not
* supported. Only 'k' (kilo), 'm' (mega), 'g' (giga) suffixes are supported.
* Spaces (but not other whitespace) between value and suffix are allowed.
*
* @param sizestring A string containing a (decimal) size value.
* @param size Pointer to uint64_t which will contain the string's size value.
*
* @return SR_OK upon success, SR_ERR upon errors.
*/
SR_API int sr_parse_sizestring(const char *sizestring, uint64_t *size)
{
int multiplier, done;
char *s;
*size = strtoull(sizestring, &s, 10);
multiplier = 0;
done = FALSE;
while (s && *s && multiplier == 0 && !done) {
switch (*s) {
case ' ':
break;
case 'k':
case 'K':
multiplier = SR_KHZ(1);
break;
case 'm':
case 'M':
multiplier = SR_MHZ(1);
break;
case 'g':
case 'G':
multiplier = SR_GHZ(1);
break;
default:
done = TRUE;
s--;
}
s++;
}
if (multiplier > 0)
*size *= multiplier;
if (*s && strcasecmp(s, "Hz"))
return SR_ERR;
return SR_OK;
}
/**
* Convert a "natural" string representation of a time value to an
* uint64_t value in milliseconds.
*
* E.g. a value of "3s" or "3 s" would be converted to 3000, a value
* of "15ms" would be converted to 15.
*
* Value representations other than decimal (such as hex or octal) are not
* supported. Only lower-case "s" and "ms" time suffixes are supported.
* Spaces (but not other whitespace) between value and suffix are allowed.
*
* @param timestring A string containing a (decimal) time value.
* @return The string's time value as uint64_t, in milliseconds.
*
* @todo Add support for "m" (minutes) and others.
* @todo Add support for picoseconds?
* @todo Allow both lower-case and upper-case? If no, document it.
*/
SR_API uint64_t sr_parse_timestring(const char *timestring)
{
uint64_t time_msec;
char *s;
/* TODO: Error handling, logging. */
time_msec = strtoull(timestring, &s, 10);
if (time_msec == 0 && s == timestring)
return 0;
if (s && *s) {
while (*s == ' ')
s++;
if (!strcmp(s, "s"))
time_msec *= 1000;
else if (!strcmp(s, "ms"))
; /* redundant */
else
return 0;
}
return time_msec;
}
SR_API gboolean sr_parse_boolstring(const char *boolstr)
{
if (!boolstr)
return FALSE;
if (!g_ascii_strncasecmp(boolstr, "true", 4) ||
!g_ascii_strncasecmp(boolstr, "yes", 3) ||
!g_ascii_strncasecmp(boolstr, "on", 2) ||
!g_ascii_strncasecmp(boolstr, "1", 1))
return TRUE;
return FALSE;
}
SR_API int sr_parse_period(const char *periodstr, uint64_t *p, uint64_t *q)
{
char *s;
*p = strtoull(periodstr, &s, 10);
if (*p == 0 && s == periodstr)
/* No digits found. */
return SR_ERR_ARG;
if (s && *s) {
while (*s == ' ')
s++;
if (!strcmp(s, "fs"))
*q = 1000000000000000ULL;
else if (!strcmp(s, "ps"))
*q = 1000000000000ULL;
else if (!strcmp(s, "ns"))
*q = 1000000000ULL;
else if (!strcmp(s, "us"))
*q = 1000000;
else if (!strcmp(s, "ms"))
*q = 1000;
else if (!strcmp(s, "s"))
*q = 1;
else
/* Must have a time suffix. */
return SR_ERR_ARG;
}
return SR_OK;
}
SR_API int sr_parse_voltage(const char *voltstr, uint64_t *p, uint64_t *q)
{
char *s;
*p = strtoull(voltstr, &s, 10);
if (*p == 0 && s == voltstr)
/* No digits found. */
return SR_ERR_ARG;
if (s && *s) {
while (*s == ' ')
s++;
if (!strcasecmp(s, "mv"))
*q = 1000L;
else if (!strcasecmp(s, "v"))
*q = 1;
else
/* Must have a base suffix. */
return SR_ERR_ARG;
}
return SR_OK;
}
/** @} */