libsigrok/strutil.c

264 lines
6.5 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 *sr_samplerate_string(uint64_t samplerate)
{
char *o;
int r;
o = malloc(30 + 1); /* Enough for a uint64_t as string + " GHz". */
if (!o)
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 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 malloc()ed string representation of the frequency value,
* or NULL upon errors. The caller is responsible to free() the memory.
*/
char *sr_period_string(uint64_t frequency)
{
char *o;
int r;
o = malloc(30 + 1); /* Enough for a uint64_t as string + " ms". */
if (!o)
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;
}
/**
* TODO
*
* @param device TODO
* @param triggerstring TODO
* @return TODO
*/
char **sr_parse_triggerstring(struct sr_device *device,
const char *triggerstring)
{
GSList *l;
struct sr_probe *probe;
int max_probes, probenum, i;
char **tokens, **triggerlist, *trigger, *tc, *trigger_types;
gboolean error;
max_probes = g_slist_length(device->probes);
error = FALSE;
triggerlist = g_malloc0(max_probes * sizeof(char *));
tokens = g_strsplit(triggerstring, ",", max_probes);
trigger_types = device->plugin->get_device_info(0, SR_DI_TRIGGER_TYPES);
if (trigger_types == NULL)
return NULL;
for (i = 0; tokens[i]; i++) {
if (tokens[i][0] < '0' || tokens[i][0] > '9') {
/* Named probe */
probenum = 0;
for (l = device->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;
}
}
} else {
probenum = strtol(tokens[i], NULL, 10);
}
if (probenum < 1 || probenum > max_probes) {
printf("Invalid probe.\n");
error = TRUE;
break;
}
if ((trigger = strchr(tokens[i], '='))) {
for (tc = ++trigger; *tc; tc++) {
if (strchr(trigger_types, *tc) == NULL) {
printf("Unsupported trigger type "
"'%c'\n", *tc);
error = TRUE;
break;
}
}
if (!error)
triggerlist[probenum - 1] = g_strdup(trigger);
}
}
g_strfreev(tokens);
if (error) {
for (i = 0; i < max_probes; i++)
if (triggerlist[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.
* @return The string's size value as uint64_t.
*
* TODO: Error handling.
*/
uint64_t sr_parse_sizestring(const char *sizestring)
{
int multiplier;
uint64_t val;
char *s;
val = strtoull(sizestring, &s, 10);
multiplier = 0;
while (s && *s && multiplier == 0) {
switch (*s) {
case ' ':
break;
case 'k':
case 'K':
multiplier = KHZ(1);
break;
case 'm':
case 'M':
multiplier = MHZ(1);
break;
case 'g':
case 'G':
multiplier = GHZ(1);
break;
default:
val = 0;
multiplier = -1;
}
s++;
}
if (multiplier > 0)
val *= multiplier;
return val;
}
/**
* 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: Error handling.
* TODO: Add support for "m" (minutes) and others.
* TODO: picoseconds?
* TODO: Allow both lower-case and upper-case.
*/
uint64_t sr_parse_timestring(const char *timestring)
{
uint64_t time_msec;
char *s;
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;
}