static int
scan(FILE *fp, const char *name, bool quiet)
{
int c;
bool hasid = false;
bool subversion = false;
analyzer_states state = INIT;
struct sbuf *id = sbuf_new_auto();
locale_t l;
l = newlocale(LC_ALL_MASK, "C", NULL);
if (name != NULL)
printf("%s:\n", name);
while ((c = fgetc(fp)) != EOF) {
switch (state) {
case INIT:
if (c == '$') {
/* Transit to DELIM_SEEN if we see $ */
state = DELIM_SEEN;
} else {
/* Otherwise, stay in INIT state */
continue;
}
break;
case DELIM_SEEN:
if (isalpha_l(c, l)) {
/* Transit to KEYWORD if we see letter */
sbuf_clear(id);
sbuf_putc(id, '$');
sbuf_putc(id, c);
state = KEYWORD;
continue;
} else if (c == '$') {
/* Or, stay in DELIM_SEEN if more $ */
continue;
} else {
/* Otherwise, transit back to INIT */
state = INIT;
}
break;
case KEYWORD:
sbuf_putc(id, c);
if (isalpha_l(c, l)) {
/*
* Stay in KEYWORD if additional letter is seen
*/
continue;
} else if (c == ':') {
/*
* See ':' for the first time, transit to
* PUNC_SEEN.
*/
state = PUNC_SEEN;
subversion = false;
} else if (c == '$') {
/*
* Incomplete ident. Go back to DELIM_SEEN
* state because we see a '$' which could be
* the beginning of a keyword.
*/
state = DELIM_SEEN;
} else {
/*
* Go back to INIT state otherwise.
*/
state = INIT;
}
break;
case PUNC_SEEN:
case PUNC_SEEN_SVN:
sbuf_putc(id, c);
switch (c) {
case ':':
/*
* If we see '::' (seen : in PUNC_SEEN),
* activate subversion treatment and transit
* to PUNC_SEEN_SVN state.
*
* If more than two :'s were seen, the ident
* is invalid and we would therefore go back
* to INIT state.
*/
if (state == PUNC_SEEN) {
state = PUNC_SEEN_SVN;
subversion = true;
} else {
state = INIT;
}
break;
case ' ':
/*
* A space after ':' or '::' indicates we are at the
* last component of potential ident.
*/
state = TEXT;
break;
default:
/* All other characters are invalid */
state = INIT;
break;
}
break;
case TEXT:
sbuf_putc(id, c);
if (iscntrl_l(c, l)) {
/* Control characters are not allowed in this state */
state = INIT;
} else if (c == '$') {
sbuf_finish(id);
/*
* valid ident should end with a space.
*
* subversion extension uses '#' to indicate that
* the keyword expansion have exceeded the fixed
* width, so it is also permitted if we are in
* subversion mode. No length check is enforced
* because GNU RCS ident(1) does not do it either.
*/
c = sbuf_data(id)[sbuf_len(id) - 2];
if (c == ' ' || (subversion && c == '#')) {
printf(" %s\n", sbuf_data(id));
hasid = true;
}
state = INIT;
}
/* Other characters: stay in the state */
break;
}
}
sbuf_delete(id);
freelocale(l);
if (!hasid) {
if (!quiet)
fprintf(stderr, "%s warning: no id keywords in %s\n",
getprogname(), name ? name : "standard input");
return (EXIT_FAILURE);
}
return (EXIT_SUCCESS);
}
int isprint_l(int c, locale_t loc) {
return !iscntrl_l(c, loc);
}
