htop/generic/uname.c

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/*
htop - generic/uname.c
(C) 2021 htop dev team
Released under the GNU GPLv2+, see the COPYING file
in the source distribution for its full text.
*/
#include "config.h" // IWYU pragma: keep
#include "generic/uname.h"
2021-04-29 15:12:43 +00:00
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include "Macros.h"
#include "XUtils.h"
#ifdef HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#endif
#ifndef OSRELEASEFILE
#define OSRELEASEFILE "/etc/os-release"
#endif
static void parseOSRelease(char* buffer, size_t bufferLen) {
FILE* stream = fopen(OSRELEASEFILE, "r");
if (!stream) {
xSnprintf(buffer, bufferLen, "No OS Release");
return;
}
char name[64] = {'\0'};
char version[64] = {'\0'};
char lineBuffer[256];
while (fgets(lineBuffer, sizeof(lineBuffer), stream)) {
if (String_startsWith(lineBuffer, "PRETTY_NAME=\"")) {
const char* start = lineBuffer + strlen("PRETTY_NAME=\"");
const char* stop = strrchr(lineBuffer, '"');
if (!stop || stop <= start)
continue;
String_safeStrncpy(buffer, start, MINIMUM(bufferLen, (size_t)(stop - start + 1)));
fclose(stream);
return;
}
if (String_startsWith(lineBuffer, "NAME=\"")) {
const char* start = lineBuffer + strlen("NAME=\"");
const char* stop = strrchr(lineBuffer, '"');
if (!stop || stop <= start)
continue;
String_safeStrncpy(name, start, MINIMUM(sizeof(name), (size_t)(stop - start + 1)));
continue;
}
if (String_startsWith(lineBuffer, "VERSION=\"")) {
const char* start = lineBuffer + strlen("VERSION=\"");
const char* stop = strrchr(lineBuffer, '"');
if (!stop || stop <= start)
continue;
String_safeStrncpy(version, start, MINIMUM(sizeof(version), (size_t)(stop - start + 1)));
continue;
}
}
fclose(stream);
snprintf(buffer, bufferLen, "%s%s%s", name[0] ? name : "", name[0] && version[0] ? " " : "", version);
}
char* Generic_uname(void) {
static char savedString[
/* uname structure fields - manpages recommend sizeof */
sizeof(((struct utsname*)0)->sysname) +
sizeof(((struct utsname*)0)->release) +
sizeof(((struct utsname*)0)->machine) +
16/*markup*/ +
128/*distro*/] = {'\0'};
static bool loaded_data = false;
if (!loaded_data) {
struct utsname uname_info;
int uname_result = uname(&uname_info);
char distro[128];
parseOSRelease(distro, sizeof(distro));
if (uname_result == 0) {
size_t written = xSnprintf(savedString, sizeof(savedString), "%s %s [%s]", uname_info.sysname, uname_info.release, uname_info.machine);
if (!String_contains_i(savedString, distro) && sizeof(savedString) > written)
snprintf(savedString + written, sizeof(savedString) - written, " @ %s", distro);
} else {
snprintf(savedString, sizeof(savedString), "%s", distro);
}
loaded_data = true;
}
return savedString;
}