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hush: Add default value substitution support

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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.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Joe Hershberger 2012-08-17 10:26:29 +00:00 committed by Wolfgang Denk
parent 923c46f97a
commit 641b0d374e
1 changed files with 40 additions and 3 deletions
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37
common/hush.c
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@ -2743,14 +2743,51 @@ static int parse_group(o_string *dest, struct p_context *ctx,
static char *lookup_param(char *src) static char *lookup_param(char *src)
{ {
char *p; char *p;
char *sep;
char *default_val = NULL;
int assign = 0;
int expand_empty = 0;
if (!src) if (!src)
return NULL; return NULL;
sep = strchr(src, ':');
if (sep) {
*sep = '\0';
if (*(sep + 1) == '-')
default_val = sep+2;
if (*(sep + 1) == '=') {
default_val = sep+2;
assign = 1;
}
if (*(sep + 1) == '+') {
default_val = sep+2;
expand_empty = 1;
}
}
p = getenv(src); p = getenv(src);
if (!p) if (!p)
p = get_local_var(src); p = get_local_var(src);
if (!p || strlen(p) == 0) {
p = default_val;
if (assign) {
char *var = malloc(strlen(src)+strlen(default_val)+2);
if (var) {
sprintf(var, "%s=%s", src, default_val);
set_local_var(var, 0);
}
free(var);
}
} else if (expand_empty) {
p += strlen(p);
}
if (sep)
*sep = ':';
return p; return p;
} }