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