C++ (Cpp) write_env_area Beispiele

Beispiel #1

Datei: env.c Projekt: 4Fwolf/signal75-kernel-3.10.61

int set_env(char *name,char *value)
{
	int  len, oldval;
	char *env, *nxt = NULL;
	
	int ret;

	char *env_data = g_env.env_data;

	printk("[%s]set_env %s %s\n",MODULE_NAME,name,value);

	oldval = -1;
	if(!env_buffer){
		return -1;
	}
	if(!env_valid){
		env = env_data;
		goto add;
	}
	
	for (env=env_data; *env; env=nxt+1) {
		for (nxt=env; *nxt; ++nxt)
			;
		if ((oldval = envmatch((char *)name, env-env_data)) >= 0)
			break;
	}

	if(oldval>0){
		if (*++nxt == '\0') {
			if (env > env_data) {
				env--;
			} else {
				*env = '\0';
			}
		} else {
			for (;;) {
				*env = *nxt++;
				if ((*env == '\0') && (*nxt == '\0'))
					break;
				++env;
			}
		}
		*++env = '\0';
	}

	for (env=env_data; *env || *(env+1); ++env)
		;
	if (env > env_data)
		++env;

add:
	if(*value == '\0'){
		printk("[LK_ENV]clear %s\n",name);
		goto write_env;
	}
		/*
	 * Overflow when:
	 * "name" + "=" + "val" +"\0\0"  > ENV_SIZE - (env-env_data)
	 */
	len = strlen(name) + 2;
	/* add '=' for first arg, ' ' for all others */
	len += strlen(value) + 1;

	if (len > (&env_data[CFG_ENV_DATA_SIZE]-env)) {
		printk ("## Error: environment overflow, \"%s\" deleted\n", name);
		return -1;
	}
	while ((*env = *name++) != '\0')
		env++;
	
	*env = '=';
	
	while ((*++env = *value++) != '\0')
			;

write_env:
	/* end is marked with double '\0' */
	*++env = '\0';
	memset(env,0x00,CFG_ENV_DATA_SIZE-(env-env_data));

	ret = write_env_area(env_buffer);
	if(ret < 0){
		printk("[%s]write env fail\n",MODULE_NAME);
		memset(env_buffer,0x00,CFG_ENV_SIZE);
		return -1;
	}
	env_valid = 1;
	return 0;

}

Beispiel #2

Datei: sysenv.c Projekt: CobraJet93/kernel-3.10.54

int set_env(char *name,char *value)
{
	int  len;
	int  oldval = -1;
	char *env, *nxt = NULL;
	int ret = 0;
	char *env_data = NULL;
	pr_notice("[%s]set env, name=%s,value=%s\n", 
		  MODULE_NAME, name, value);
	
	env_init();

	env_data = g_env.env_data;
	if (!env_buffer) {
		return (-1);
	}
	if (!env_valid) {
		env = env_data;
		goto add;
	}
/* find match name and return the val header pointer*/
	for (env = env_data; *env; env = nxt + 1) {
		for (nxt=env; *nxt; ++nxt) {
			;
		}
		if ((oldval = envmatch((char *)name, env-env_data)) >= 0)
			break;
	}/* end find */
	if (oldval>0) {
		if (*++nxt == '\0') {
			if (env > env_data) {
				env--;
			} else {
				*env = '\0';
			}
		} else {
			for (;;) {
				*env = *nxt++;
				if ((*env == '\0') && (*nxt == '\0'))
					break;
				++env;
			}
		}
		*++env = '\0';
	}

	for (env=env_data; *env || *(env+1); ++env) {
		;
	}
	if (env > env_data) {
		++env;
	}
add:
	if (*value == '\0') {
		pr_notice("[%s]clear env name=%s\n", 
			  MODULE_NAME, name);
		goto write_env;
	}

	len = strlen(name) + 2;
	len += strlen(value) + 1;
	if (len > (&env_data[CFG_ENV_DATA_SIZE] - env)) {
		pr_err("[%s]env data overflow, %s deleted\n", 
			MODULE_NAME, name);
		return -1;
	}
	while ((*env = *name++) != '\0') {
		env++;
	}
	*env = '=';
	while ((*++env = *value++) != '\0') {
		;
	}
write_env:
/* end is marked with double '\0' */
	*++env = '\0';
	memset(env, 0x00, CFG_ENV_DATA_SIZE - (env - env_data));

	ret = write_env_area(env_buffer);
	if (ret < 0) {
		pr_err("[%s]%s error: write env area fail\n", 
			MODULE_NAME, __FUNCTION__);
		memset(env_buffer, 0x00, CFG_ENV_SIZE);
		return -1;
	}
	env_valid = 1;
	return 0;
}