[U-Boot] [PATCH v2] tools: env: support skip leading zero of env

[Stefan Agner]

Maybe I miss something, but why is this needed exactly?


--

Stefan

On 27.11.18 02:49, zqb-all wrote:
> Signed-off-by: zqb-all <zhuangqiubin at gmail.com>
> ---
> v2: fix all "env = environment.data" and "env = default_environment"
>
>  tools/env/fw_env.c | 46 ++++++++++++++++++++++++++++++++++++++++------
>  1 file changed, 40 insertions(+), 6 deletions(-)
>
> diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
> index a5d7595..60742b6 100644
> --- a/tools/env/fw_env.c
> +++ b/tools/env/fw_env.c
> @@ -398,7 +398,14 @@ char *fw_getenv(char *name)
>  {
>  	char *env, *nxt;
>  
> -	for (env = environment.data; *env; env = nxt + 1) {
> +	for (nxt = environment.data; !(*nxt); ++nxt) {
> +		if (nxt >= &environment.data[ENV_SIZE]) {
> +			fprintf (stderr, "## Error: "
> +				"environment is empty\n");
> +			return NULL;
> +		}
> +	}
> +	for (env = nxt; *env; env = nxt + 1) {
>  		char *val;
>  
>  		for (nxt = env; *nxt; ++nxt) {
> @@ -423,8 +430,14 @@ char *fw_getenv(char *name)
>  char *fw_getdefenv(char *name)
>  {
>  	char *env, *nxt;
> -
> -	for (env = default_environment; *env; env = nxt + 1) {
> +	for (nxt = default_environment; !(*nxt); ++nxt) {
> +		if (nxt >= &default_environment[ENV_SIZE]) {
> +			fprintf (stderr, "## Error: "
> +				"default environment is empty\n");
> +			return NULL;
> +		}
> +	}
> +	for (env = nxt; *env; env = nxt + 1) {
>  		char *val;
>  
>  		for (nxt = env; *nxt; ++nxt) {
> @@ -464,7 +477,14 @@ int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts)
>  
>  	if (argc == 0) {	/* Print all env variables  */
>  		char *env, *nxt;
> -		for (env = environment.data; *env; env = nxt + 1) {
> +		for (nxt = environment.data; !(*nxt); ++nxt) {
> +			if (nxt >= &environment.data[ENV_SIZE]) {
> +				fprintf (stderr, "## Error: "
> +					"environment is empty\n");
> +				return -1;
> +			}
> +		}
> +		for (env = nxt; *env; env = nxt + 1) {
>  			for (nxt = env; *nxt; ++nxt) {
>  				if (nxt >= &environment.data[ENV_SIZE]) {
>  					fprintf(stderr, "## Error: "
> @@ -537,7 +557,14 @@ int fw_env_write(char *name, char *value)
>  	/*
>  	 * search if variable with this name already exists
>  	 */
> -	for (nxt = env = environment.data; *env; env = nxt + 1) {
> +	for (nxt = environment.data; !(*nxt); ++nxt) {
> +		if (nxt >= &environment.data[ENV_SIZE]) {
> +			fprintf (stderr, "## Error: "
> +				"environment is empty\n");
> +			return -1;
> +		}
> +	}
> +	for (env = nxt; *env; env = nxt + 1) {
>  		for (nxt = env; *nxt; ++nxt) {
>  			if (nxt >= &environment.data[ENV_SIZE]) {
>  				fprintf(stderr, "## Error: "
> @@ -614,7 +641,14 @@ int fw_env_write(char *name, char *value)
>  	/*
>  	 * Append new definition at the end
>  	 */
> -	for (env = environment.data; *env || *(env + 1); ++env)
> +	for (nxt = environment.data; !(*nxt); ++nxt) {
> +		if (nxt >= &environment.data[ENV_SIZE]) {
> +			fprintf (stderr, "## Error: "
> +				"environment is empty\n");
> +			return -1;
> +		}
> +	}
> +	for (env = nxt; *env || *(env + 1); ++env)
>  		;
>  	if (env > environment.data)
>  		++env;