Commit 76a54095 authored by Arnaud Lacombe's avatar Arnaud Lacombe

kconfig: add a symbol string expansion helper

Signed-off-by: default avatarArnaud Lacombe <lacombar@gmail.com>
Reviewed-by: default avatarSam Ravnborg <sam@ravnborg.org>
Reviewed-by: default avatarMichal Marek <mmarek@suse.cz>
parent c0920a1c
......@@ -28,6 +28,7 @@ P(symbol_hash,struct symbol *,[SYMBOL_HASHSIZE]);
P(sym_lookup,struct symbol *,(const char *name, int flags));
P(sym_find,struct symbol *,(const char *name));
P(sym_expand_string_value,const char *,(const char *in));
P(sym_re_search,struct symbol **,(const char *pattern));
P(sym_type_name,const char *,(enum symbol_type type));
P(sym_calc_value,void,(struct symbol *sym));
......
......@@ -840,6 +840,55 @@ struct symbol *sym_find(const char *name)
return symbol;
}
/*
* Expand symbol's names embedded in the string given in argument. Symbols'
* name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
* the empty string.
*/
const char *sym_expand_string_value(const char *in)
{
const char *src;
char *res;
size_t reslen;
reslen = strlen(in) + 1;
res = malloc(reslen);
res[0] = '\0';
while ((src = strchr(in, '$'))) {
char *p, name[SYMBOL_MAXLENGTH];
const char *symval = "";
struct symbol *sym;
size_t newlen;
strncat(res, in, src - in);
src++;
p = name;
while (isalnum(*src) || *src == '_')
*p++ = *src++;
*p = '\0';
sym = sym_find(name);
if (sym != NULL) {
sym_calc_value(sym);
symval = sym_get_string_value(sym);
}
newlen = strlen(res) + strlen(symval) + strlen(src);
if (newlen > reslen) {
reslen = newlen;
realloc(res, reslen);
}
strcat(res, symval);
in = src;
}
strcat(res, in);
return res;
}
struct symbol **sym_re_search(const char *pattern)
{
struct symbol *sym, **sym_arr = NULL;
......
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