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Combined size reduction changes by Glenn and myself. Added back in "unknown"

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for -p to match normal uname behavior (at a cost of 30-40 bytes).
This commit is contained in:
Manuel Novoa III 2001-12-05 04:21:30 +00:00
parent 1dbbd2fe34
commit 6509f92a3b
1 changed files with 52 additions and 100 deletions
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152
coreutils/uname.c
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@ -31,126 +31,78 @@
/* Busyboxed by Erik Andersen */
/* Further size reductions by Glenn McGrath and Manuel Novoa III. */
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <sys/types.h>
#include <sys/utsname.h>
#if defined (HAVE_SYSINFO) && defined (HAVE_SYS_SYSTEMINFO_H)
# include <sys/systeminfo.h>
#endif
#include <getopt.h>
#include "busybox.h"
static void print_element(unsigned int mask, char *element);
/* Values that are bitwise or'd into `toprint'. */
/* Operating system name. */
static const int PRINT_SYSNAME = 1;
/* Node name on a communications network. */
static const int PRINT_NODENAME = 2;
/* Operating system release. */
static const int PRINT_RELEASE = 4;
/* Operating system version. */
static const int PRINT_VERSION = 8;
/* Machine hardware name. */
static const int PRINT_MACHINE = 16;
/* Host processor type. */
static const int PRINT_PROCESSOR = 32;
/* Mask indicating which elements of the name to print. */
static unsigned char toprint;
typedef struct {
struct utsname name;
char processor[8]; /* for "unknown" */
} uname_info_t;
static const char options[] = "snrvmpa";
static const char flags[] = "\x01\x02\x04\x08\x10\x20\x3f";
static const unsigned short int utsname_offset[] = {
offsetof(uname_info_t,name.sysname),
offsetof(uname_info_t,name.nodename),
offsetof(uname_info_t,name.release),
offsetof(uname_info_t,name.version),
offsetof(uname_info_t,name.machine),
offsetof(uname_info_t,processor)
};
int uname_main(int argc, char **argv)
{
struct utsname name;
char processor[256];
uname_info_t uname_info;
#if defined(__sparc__) && defined(__linux__)
char *fake_sparc = getenv("FAKE_SPARC");
#endif
toprint = 0;
const unsigned short int *delta;
int opt;
char toprint = 0;
/* Parse any options */
//fprintf(stderr, "argc=%d, argv=%s\n", argc, *argv);
while (--argc > 0 && **(++argv) == '-') {
while (*(++(*argv))) {
switch (**argv) {
case 's':
toprint |= PRINT_SYSNAME;
break;
case 'n':
toprint |= PRINT_NODENAME;
break;
case 'r':
toprint |= PRINT_RELEASE;
break;
case 'v':
toprint |= PRINT_VERSION;
break;
case 'm':
toprint |= PRINT_MACHINE;
break;
case 'p':
toprint |= PRINT_PROCESSOR;
break;
case 'a':
toprint = (PRINT_SYSNAME | PRINT_NODENAME | PRINT_RELEASE |
PRINT_PROCESSOR | PRINT_VERSION |
PRINT_MACHINE);
break;
default:
show_usage();
}
while ((opt = getopt(argc, argv, options)) != -1) {
const char *p = strchr(options,opt);
if (p == NULL) {
show_usage();
}
toprint |= flags[(int)(p-options)];
}
if (toprint == 0) {
toprint = flags[0]; /* sysname */
}
if (uname(&uname_info.name) == -1) {
error_msg_and_die("cannot get system name");
}
#if defined(__sparc__) && defined(__linux__)
if ((fake_sparc != NULL)
&& ((fake_sparc[0] == 'y')
|| (fake_sparc[0] == 'Y'))) {
strcpy(uname_info.name.machine, "sparc");
}
#endif
strcpy(uname_info.processor, "unknown");
for (delta=utsname_offset ; toprint ; delta++, toprint >>= 1) {
if (toprint & 1) {
printf("%s ", ((char *)(&uname_info)) + *delta );
}
}
if (toprint == 0)
toprint = PRINT_SYSNAME;
if (uname(&name) == -1)
perror_msg("cannot get system name");
#if defined (HAVE_SYSINFO) && defined (SI_ARCHITECTURE)
if (sysinfo(SI_ARCHITECTURE, processor, sizeof(processor)) == -1)
perror_msg("cannot get processor type");
}
#else
strcpy(processor, "unknown");
#endif
#if defined(__sparc__) && defined(__linux__)
if (fake_sparc != NULL
&& (fake_sparc[0] == 'y'
|| fake_sparc[0] == 'Y')) strcpy(name.machine, "sparc");
#endif
print_element(PRINT_SYSNAME, name.sysname);
print_element(PRINT_NODENAME, name.nodename);
print_element(PRINT_RELEASE, name.release);
print_element(PRINT_VERSION, name.version);
print_element(PRINT_MACHINE, name.machine);
print_element(PRINT_PROCESSOR, processor);
putchar('\n');
return EXIT_SUCCESS;
}
/* If the name element set in MASK is selected for printing in `toprint',
print ELEMENT; then print a space unless it is the last element to
be printed, in which case print a newline. */
static void print_element(unsigned int mask, char *element)
{
if (toprint & mask) {
toprint &= ~mask;
printf("%s%c", element, toprint ? ' ' : '\n');
}
}