7 /* declare [ident] as [storage] [function specs] [other crap] [qualifiers] [type specs] */
10 voutput(char *buf, size_t n, size_t off, const char *fmt, va_list ap)
13 return vsnprintf(NULL, 0, fmt, ap);
14 return vsnprintf(buf+off, n-off, fmt, ap);
17 static size_t output(char *buf, size_t n, size_t off, const char *fmt, ...)
23 ret = voutput(buf, n, off, fmt, ap);
29 /* Renders the type qualifiers and type specifiers in canonical form. */
31 explain_post_specs(char *buf, size_t n, struct cdecl_declspec *s)
33 unsigned long qualmap = 0, typemap;
34 const char *tag = NULL;
37 typemap = cdecl__build_typemap(s);
41 for (struct cdecl_declspec *c = s; c; c = c->next) {
42 switch (cdecl_spec_kind(c)) {
44 qualmap |= 1ul << (c->type & 0xff);
47 /* Valid C types have at most one identifier. */
54 if (qualmap & (1ul << (CDECL_QUAL_RESTRICT & 0xff)))
55 ret += output(buf, n, ret, "restrict ");
56 if (qualmap & (1ul << (CDECL_QUAL_VOLATILE & 0xff)))
57 ret += output(buf, n, ret, "volatile ");
58 if (qualmap & (1ul << (CDECL_QUAL_CONST & 0xff)))
59 ret += output(buf, n, ret, "const ");
61 ret += output(buf, n, ret, "%s", cdecl__explain_typemap(typemap));
63 ret += output(buf, n, ret, " %s", tag);
67 static const char *explain_storage(unsigned spec)
70 case CDECL_STOR_TYPEDEF:
72 case CDECL_STOR_EXTERN:
74 case CDECL_STOR_STATIC:
78 case CDECL_STOR_REGISTER:
85 /* Renders the storage-class and function specifiers in canonical form. */
86 static size_t explain_pre_specs(char *buf, size_t n, struct cdecl_declspec *s)
88 unsigned long funcmap = 0;
89 const char *storage = NULL;
92 for (struct cdecl_declspec *c = s; c; c = c->next) {
93 switch (cdecl_spec_kind(c)) {
95 funcmap |= 1ul << (c->type & 0xff);
98 /* Valid C declarations have at most one
99 * storage-class specifier. */
100 storage = explain_storage(c->type);
106 ret += output(buf, n, ret, "%s", storage);
107 if (funcmap & (1ul << (CDECL_FUNC_INLINE & 0xff)))
108 ret += output(buf, n, ret, "%.*s%s", !!ret, "", "inline");
112 static size_t advance(char **buf, size_t *n, size_t amount)
121 (*buf)[amount] = ' ';
122 if (amount + 1 >= *n) {
134 size_t cdecl_explain(char *buf, size_t n, struct cdecl *decl)
139 * XXX: This won't work when we add support for more complicated
142 rc = output(buf, n, 0, "declare %s as", decl->declarators->ident);
143 ret += advance(&buf, &n, rc);
145 rc = explain_pre_specs(buf, n, decl->specifiers);
146 ret += advance(&buf, &n, rc);
148 return ret + explain_post_specs(buf, n, decl->specifiers);