Commit 0f855aa6 authored by Sam Ravnborg's avatar Sam Ravnborg

kconfig: add helper to set config symbol from environment variable

Add conf_set_env_sym() that can set an already defined symbol
based on the value of an environment variable.

Unknown symbols are silently ignored.
A warning is printed if the value of the environment variable
is unexpected.
Signed-off-by: default avatarSam Ravnborg <>
Cc: Roman Zippel <>
parent 9c900a9c
...@@ -145,6 +145,33 @@ static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p) ...@@ -145,6 +145,33 @@ static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
return 0; return 0;
} }
/* Read an environment variable and assign the value to the symbol */
int conf_set_env_sym(const char *env, const char *symname, int def)
struct symbol *sym;
char *p;
int def_flags;
p = getenv(env);
if (p) {
char warning[200];
sprintf(warning, "Environment variable (%s = \"%s\")", env, p);
conf_filename = warning;
def_flags = SYMBOL_DEF << def;
if (def == S_DEF_USER) {
sym = sym_find(symname);
if (!sym)
return 1;
} else {
sym = sym_lookup(symname, 0);
if (sym->type == S_UNKNOWN)
sym->type = S_OTHER;
conf_set_sym_val(sym, def, def_flags, p);
return 0;
int conf_read_simple(const char *name, int def) int conf_read_simple(const char *name, int def)
{ {
FILE *in = NULL; FILE *in = NULL;
/* confdata.c */ /* confdata.c */
P(conf_parse,void,(const char *name)); P(conf_parse,void,(const char *name));
P(conf_set_env_sym,int,(const char *envname, const char *symname, int def));
P(conf_read,int,(const char *name)); P(conf_read,int,(const char *name));
P(conf_read_simple,int,(const char *name, int)); P(conf_read_simple,int,(const char *name, int));
P(conf_write,int,(const char *name)); P(conf_write,int,(const char *name));
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