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util/cutils: Introduce freq_to_str() to display Hertz units

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Introduce freq_to_str() to convert frequency values in human
friendly units using the SI units for Hertz.

Suggested-by: Luc Michel <luc@lmichel.fr>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Luc Michel <luc@lmichel.fr>
Message-Id: <20201012095804.3335117-2-f4bug@amsat.org>
This commit is contained in:
Philippe Mathieu-Daudé 2020-10-12 11:57:44 +02:00
parent 7daf8f8d01
commit 709616c713
2 changed files with 26 additions and 0 deletions
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12
include/qemu/cutils.h
View file

@ -158,6 +158,18 @@ int qemu_strtosz_metric(const char *nptr, const char **end, uint64_t *result);
char *size_to_str(uint64_t val);
/**
* freq_to_str:
* @freq_hz: frequency to stringify
*
* Return human readable string for frequency @freq_hz.
* Use SI units like KHz, MHz, and so forth.
*
* The caller is responsible for releasing the value returned
* with g_free() after use.
*/
char *freq_to_str(uint64_t freq_hz);
/* used to print char* safely */
#define STR_OR_NULL(str) ((str) ? (str) : "null")

14
util/cutils.c
View file

@ -885,6 +885,20 @@ char *size_to_str(uint64_t val)
return g_strdup_printf("%0.3g %sB", (double)val / div, suffixes[i]);
}
char *freq_to_str(uint64_t freq_hz)
{
static const char *const suffixes[] = { "", "K", "M", "G", "T", "P", "E" };
double freq = freq_hz;
size_t idx = 0;
while (freq >= 1000.0 && idx < ARRAY_SIZE(suffixes)) {
freq /= 1000.0;
idx++;
}
return g_strdup_printf("%0.3g %sHz", freq, suffixes[idx]);
}
int qemu_pstrcmp0(const char **str1, const char **str2)
{
return g_strcmp0(*str1, *str2);