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-rw-r--r--coreutils/uname.c144
1 files changed, 48 insertions, 96 deletions
diff --git a/coreutils/uname.c b/coreutils/uname.c
index f7e2291a8..0f3a7d5c0 100644
--- a/coreutils/uname.c
+++ b/coreutils/uname.c
@@ -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;
-
- /* 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();
- }
+ const unsigned short int *delta;
+ int opt;
+ char toprint = 0;
+
+ 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 = 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");
-}
+ if (toprint == 0) {
+ toprint = flags[0]; /* sysname */
+ }
-#else
- strcpy(processor, "unknown");
-#endif
+ 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(name.machine, "sparc");
+ if ((fake_sparc != NULL)
+ && ((fake_sparc[0] == 'y')
+ || (fake_sparc[0] == 'Y'))) {
+ strcpy(uname_info.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);
+ strcpy(uname_info.processor, "unknown");
- return EXIT_SUCCESS;
-}
+ for (delta=utsname_offset ; toprint ; delta++, toprint >>= 1) {
+ if (toprint & 1) {
+ printf("%s ", ((char *)(&uname_info)) + *delta );
+ }
+ }
-/* 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. */
+ putchar('\n');
-static void print_element(unsigned int mask, char *element)
-{
- if (toprint & mask) {
- toprint &= ~mask;
- printf("%s%c", element, toprint ? ' ' : '\n');
- }
+ return EXIT_SUCCESS;
}