[U-Boot] [PATCH 1/3] hush: Add default value substitution support

[Mike Frysinger <vapier@gentoo.org>]

On Friday 17 August 2012 16:26:29 Joe Hershberger wrote:
> Use standard sh syntax:
> ${VAR:-default}
> 	Use default value: if VAR is set and non-null, expands to $VAR.
> 	Otherwise, expands to default.
> ${VAR:=default}
> 	Set default value: if VAR is set and non-null, expands to $VAR.
> 	Otherwise, sets hush VAR to default and expands to default.
> ${VAR:+default}
> 	If VAR is set and non-null, expands to the empty string.
> 	Otherwise, expands to default.

how about ${VAR-default} and ${VAR=default} and ${VAR+default} ?

> --- a/common/hush.c
> +++ b/common/hush.c
>
> +	if (sep) {
> +		*sep = '\0';
> +		if (*(sep + 1) == '-')

switch (sep[1]) {
case '-':
	...

> +			default_val = sep+2;

sep + 2

> +	if (!p || strlen(p) == 0) {

if (!p || !p[0])

> +		if (assign) {
> +			char *var = malloc(strlen(src)+strlen(default_val)+2);

please put spaces around the "+"

> +			if (var) {
> +				sprintf(var, "%s=%s", src, default_val);
> +				set_local_var(var, 0);
> +			}

isn't there a helper func for this ?
-mike
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