busybox-0.51-env.ppc.patch

这是嵌入式linux的busybox源代码

+ diff -u busybox-0.51/Config.h.ORIG busybox-0.51/Config.h
--- busybox-0.51/Config.h.ORIG	Sat Jun  2 17:26:58 2001
+++ busybox-0.51/Config.h	Sat Jun  2 17:27:57 2001
@@ -82,6 +82,7 @@
 #define BB_PING
 //#define BB_PIVOT_ROOT
 //#define BB_POWEROFF
+#define BB_PRINTENV
 //#define BB_PRINTF
 #define BB_PS
 #define BB_PWD
@@ -96,6 +97,7 @@
 //#define BB_ROUTE
 //#define BB_RPMUNPACK
 #define BB_SED
+#define BB_SETENV
 //#define BB_SETKEYCODES
 #define BB_SH
 #define BB_SLEEP
+ diff -u busybox-0.51/applets.h.ORIG busybox-0.51/applets.h
--- busybox-0.51/applets.h.ORIG	Sat Jun  2 17:26:58 2001
+++ busybox-0.51/applets.h	Sat Jun  2 17:31:32 2001
@@ -293,6 +293,9 @@
 #ifdef BB_POWEROFF
 	APPLET(poweroff, poweroff_main, _BB_DIR_SBIN)
 #endif
+#ifdef BB_PRINTENV
+	APPLET(printenv, printenv_main, _BB_DIR_BIN)
+#endif
 #ifdef BB_PRINTF
 	APPLET(printf, printf_main, _BB_DIR_USR_BIN)
 #endif
@@ -334,6 +337,9 @@
 #endif
 #ifdef BB_SED
 	APPLET(sed, sed_main, _BB_DIR_BIN)
+#endif
+#ifdef BB_SETENV
+	APPLET(setenv, setenv_main, _BB_DIR_BIN)
 #endif
 #ifdef BB_SETKEYCODES
 	APPLET(setkeycodes, setkeycodes_main, _BB_DIR_USR_BIN)
+ diff -u busybox-0.51/setenv.c.ORIG busybox-0.51/setenv.c
--- busybox-0.51/setenv.c.ORIG	Sun Jun  3 17:02:09 2001
+++ busybox-0.51/setenv.c	Sun Jun  3 17:12:12 2001
@@ -0,0 +1,533 @@
+/*
+ * (C) Copyright 2000
+ * DENX Software Engineering
+ * Wolfgang Denk, [e-mail]
+ * All rights reserved.
+ *
+ * $Date: 2001/12/13 22:31:05 $
+ * $Revision: 1.2 $
+ */
+
+#include "busybox.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "setenv.h"
+
+extern int errno;
+unsigned long crc32 (unsigned long, const unsigned char *, unsigned int);
+
+#define	CMD_GETENV	"fw_printenv"
+#define	CMD_SETENV	"fw_setenv"
+
+static char *device = "/dev/flasha";
+
+#define ENV_SIZE (CFG_ENV_SIZE - sizeof(long))
+
+typedef struct environment_s {
+	unsigned long	crc;		/* CRC32 over data bytes	*/
+	char		data[ENV_SIZE];
+} env_t;
+
+static env_t environment;
+static int valid = 0;
+
+
+#define XMK_STR(x)	#x
+#define MK_STR(x)	XMK_STR(x)
+
+static char default_environment[] = {
+#ifdef	CONFIG_BOOTARGS
+	"bootargs="	CONFIG_BOOTARGS			"\0"
+#endif
+#ifdef	CONFIG_BOOTCOMMAND
+	"bootcmd="	CONFIG_BOOTCOMMAND		"\0"
+#endif
+#if (CONFIG_BOOTDELAY >= 0)
+	"bootdelay="	MK_STR(CONFIG_BOOTDELAY)	"\0"
+#endif
+#if (CONFIG_BAUDRATE >= 0)
+	"baudrate="	MK_STR(CONFIG_BAUDRATE)		"\0"
+#endif
+#ifdef	CONFIG_ETHADDR
+	"ethaddr="	MK_STR(CONFIG_ETHADDR)		"\0"
+#endif
+#ifdef	CONFIG_IPADDR
+	"ipaddr="	MK_STR(CONFIG_IPADDR)		"\0"
+#endif
+#ifdef	CONFIG_SERVERIP
+	"serverip="	MK_STR(CONFIG_SERVERIP)		"\0"
+#endif
+	"\0"
+};
+
+static int  flash_io (int mode);
+static char *envmatch(char *s1, char *s2);
+static int env_init(void);
+
+
+/*
+ * Search the environment for a variable.
+ * Return the value, if found, or NULL, if not found.
+ */
+char *fw_getenv (char *name)
+{
+	char *env, *nxt;
+
+	if (env_init())
+		return (NULL);
+
+	for (env=environment.data; *env; env=nxt+1) {
+		char *val;
+
+		for (nxt=env; *nxt; ++nxt) {
+			if (nxt >= &environment.data[CFG_ENV_SIZE]) {
+				fprintf (stderr, "## Error: "
+					"environment not terminated\n");
+				return (NULL);
+			}
+		}
+		val=envmatch(name, env);
+		if (!val)
+			continue;
+		return (val);
+	}
+	return (NULL);
+}
+
+/*
+ * Print the current definition of one, or more, or all
+ * environment variables
+ */
+int printenv_main(int argc, char *argv[])
+{
+	char *env, *nxt;
+	int i, rc, n_flag;
+
+	if (env_init())
+		return (EXIT_FAILURE);
+
+	rc = EXIT_SUCCESS;
+
+	if (argc == 1) {		/* Print all env variables	*/
+		for (env=environment.data; *env; env=nxt+1) {
+			for (nxt=env; *nxt; ++nxt) {
+				if (nxt >= &environment.data[CFG_ENV_SIZE]) {
+					fprintf (stderr, "## Error: "
+						"environment not terminated\n");
+					return (EXIT_FAILURE);
+				}
+			}
+			puts (env);
+		}
+		return (rc);
+	}
+
+	if (strcmp(argv[1], "-n") == 0) {
+		n_flag = 1;
+		++argv;
+		--argc;
+		if (argc != 2) {
+			fprintf (stderr, "## Error: "
+				"`-n' option requires exactly one argument\n");
+			return (EXIT_FAILURE);
+		}
+	} else {
+		n_flag = 0;
+	}
+
+	for (i=1; i<argc; ++i) {	/* print single env variables	*/
+		char *name = argv[i];
+		char *val = NULL;
+
+		for (env=environment.data; *env; env=nxt+1) {
+			for (nxt=env; *nxt; ++nxt) {
+				if (nxt >= &environment.data[CFG_ENV_SIZE]) {
+					fprintf (stderr, "## Error: "
+						"environment not terminated\n");
+					return (EXIT_FAILURE);
+				}
+			}
+			val=envmatch(name, env);
+			if (val) {
+				if (!n_flag) {
+					fputs (name, stdout);
+					putc  ('=',  stdout);
+				}
+				puts  (val);
+				break;
+			}
+		}
+		if (!val) {
+			printf ("## Error: \"%s\" not defined\n", name);
+			rc = EXIT_FAILURE;
+		}
+	}
+	return (rc);
+}
+
+/*
+ * Deletes or sets environment variables.
+ */
+int setenv_main (int argc, char *argv[])
+{
+	int  i, len;
+	char *env, *nxt;
+	char *oldval = NULL;
+	char *name;
+
+	if (argc < 2) {
+		show_usage ();
+	}
+
+	if (env_init()) {
+		perror (device);
+		return (EXIT_FAILURE);
+	}
+
+	name = argv[1];
+
+	/*
+	 * search if variable with this name already exists
+	 */
+	for (nxt=env=environment.data; *env; env=nxt+1) {
+		for (nxt=env; *nxt; ++nxt) {
+			if (nxt >= &environment.data[CFG_ENV_SIZE]) {
+				fprintf (stderr, "## Error: "
+					"environment not terminated\n");
+				return (EINVAL);
+			}
+		}
+		if ((oldval=envmatch(name, env)) != NULL)
+			break;
+	}
+
+	/*
+	 * Delete any existing definition
+	 */
+	if (oldval) {
+		/*
+		 * Ethernet Address and serial# can be set only once
+		 */
+		if ((strcmp (name, "ethaddr") == 0) ||
+		    (strcmp (name, "serial#") == 0) ) {
+			fprintf (stderr, "Can't overwrite \"%s\"\n", name);
+			return (EXIT_FAILURE);
+		}
+
+		if (*++nxt == '\0') {
+			*env = '\0';
+		} else {
+			for (;;) {
+				*env = *nxt++;
+				if ((*env == '\0') && (*nxt == '\0'))
+					break;
+				++env;
+			}
+		}
+		*++env = '\0';
+	}
+
+	/* Delete only ? */
+	if (argc < 3)
+		goto WRITE_FLASH;
+
+	/*
+	 * Append new definition at the end
+	 */
+	for (env=environment.data; *env || *(env+1); ++env)
+		;
+	if (env > environment.data)
+		++env;
+	/*
+	 * Overflow when:
+	 * "name" + "=" + "val" +"\0\0"  > CFG_ENV_SIZE - (env-environment)
+	 */
+	len = strlen(name) + 2;
+	/* add '=' for first arg, ' ' for all others */
+	for (i=2; i<argc; ++i) {
+		len += strlen(argv[i]) + 1;
+	}
+	if (len > (&environment.data[CFG_ENV_SIZE]-env)) {
+		fprintf (stderr,
+			"Error: environment overflow, \"%s\" deleted\n",
+			name);
+		return (-1);
+	}
+	while ((*env = *name++) != '\0')
+		env++;
+	for (i=2; i<argc; ++i) {
+		char *val = argv[i];
+
+		*env = (i==2) ? '=' : ' ';
+		while ((*++env = *val++) != '\0')
+			;
+	}
+
+	/* end is marked with double '\0' */
+	*++env = '\0';
+
+WRITE_FLASH:
+
+	/* Update CRC */
+	environment.crc = crc32(0, environment.data, ENV_SIZE);
+
+	/* write environment back to flash */
+	if (flash_io (O_WRONLY)) {
+		perror (device);
+		return (EXIT_FAILURE);
+	}
+
+	return (EXIT_SUCCESS);
+}
+
+static int flash_io (int mode)
+{
+	int fd;
+
+	if ((fd = open(device, mode)) < 0) {
+		perror(device);