From 76a540958af5390a94b7f68c46cb7f2aed34ccf1 Mon Sep 17 00:00:00 2001 From: Arnaud Lacombe Date: Wed, 18 Aug 2010 01:23:50 -0400 Subject: kconfig: add a symbol string expansion helper Signed-off-by: Arnaud Lacombe Reviewed-by: Sam Ravnborg Reviewed-by: Michal Marek --- scripts/kconfig/symbol.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) (limited to 'scripts/kconfig/symbol.c') diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c index 943712ca6c0..dc5dcf2189a 100644 --- a/scripts/kconfig/symbol.c +++ b/scripts/kconfig/symbol.c @@ -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; -- cgit v1.2.3