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Allow closing config elems with </> if from envvar

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The Cyclone DDS configuration is in principle an XML document, but it is
possible to write configuration fragments directly in the CYCLONEDDS_URI
environment variable.  In that case, it is quite annoying to have to
enter the full closing tags all the time, and so it now allows closing
elements with a simple </> when not reading them from a file.

While it would be trivial to also allow this when reading the
configuration from a file, it seems that promulgating invalid XML would
be bad form ... and besides, in that case editors can help keep
everything in order.

Signed-off-by: Erik Boasson <eb@ilities.com>
This commit is contained in:
Erik Boasson 2019-05-04 15:26:53 +08:00 • committed by eboasson
parent f601beb907
commit 326ab93572
3 changed files with 21 additions and 12 deletions
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5
src/ddsrt/include/dds/ddsrt/xmlparser.h
View file

@ -36,9 +36,12 @@ extern "C" {
struct ddsrt_xmlp_state;
#define DDSRT_XMLP_REQUIRE_EOF 1u /* set by default; if not set, junk may follow top-level closing tag */
#define DDSRT_XMLP_ANONYMOUS_CLOSE_TAG 2u /* clear by default; if set allow closing an element with </> instead of </name> */
DDS_EXPORT struct ddsrt_xmlp_state *ddsrt_xmlp_new_file (FILE *fp, void *varg, const struct ddsrt_xmlp_callbacks *cb);
DDS_EXPORT struct ddsrt_xmlp_state *ddsrt_xmlp_new_string (const char *string, void *varg, const struct ddsrt_xmlp_callbacks *cb);
DDS_EXPORT void ddsrt_xmlp_set_requireEOF (struct ddsrt_xmlp_state *st, int require_eof);
DDS_EXPORT void ddsrt_xmlp_set_options (struct ddsrt_xmlp_state *st, unsigned options);
DDS_EXPORT size_t ddsrt_xmlp_get_bufpos (const struct ddsrt_xmlp_state *st);
DDS_EXPORT void ddsrt_xmlp_free (struct ddsrt_xmlp_state *st);
DDS_EXPORT int ddsrt_xmlp_parse (struct ddsrt_xmlp_state *st);

26
src/ddsrt/src/xmlparser.c
View file

@ -49,7 +49,7 @@ struct ddsrt_xmlp_state {
size_t tpescp; /* still escape sequences in tpescp .. tpp */
int nest; /* current nesting level */
void *varg; /* user argument to callback functions */
int require_eof; /* if false, junk may follow top-level closing tag */
unsigned options;
struct ddsrt_xmlp_callbacks cb; /* user-supplied callbacks (or stubs) */
};
@ -108,7 +108,7 @@ static void ddsrt_xmlp_new_common (struct ddsrt_xmlp_state *st)
st->peekpayload = NULL;
st->nest = 0;
st->error = 0;
st->require_eof = 1;
st->options = DDSRT_XMLP_REQUIRE_EOF;
}
static void ddsrt_xmlp_new_setCB (struct ddsrt_xmlp_state *st, void *varg, const struct ddsrt_xmlp_callbacks *cb)
@ -148,9 +148,9 @@ struct ddsrt_xmlp_state *ddsrt_xmlp_new_string (const char *string, void *varg,
return st;
}
void ddsrt_xmlp_set_requireEOF (struct ddsrt_xmlp_state *st, int require_eof)
void ddsrt_xmlp_set_options (struct ddsrt_xmlp_state *st, unsigned options)
{
st->require_eof = require_eof;
st->options = options;
}
size_t ddsrt_xmlp_get_bufpos (const struct ddsrt_xmlp_state *st)
@ -451,11 +451,14 @@ static int next_token_tag_withoutclose (struct ddsrt_xmlp_state *st, char **payl
next_char (st);
}
/* we only do tag names that are identifiers */
if (!qq_isidentfirst (peek_char (st))) {
if (peek_char (st) == '>' && (st->options & DDSRT_XMLP_ANONYMOUS_CLOSE_TAG)) {
return TOK_SHORTHAND_CLOSE_TAG;
} else if (!qq_isidentfirst (peek_char (st))) {
return TOK_ERROR;
} else {
next_token_ident (st, payload);
return tok;
}
next_token_ident (st, payload);
return tok;
}
}
@ -560,6 +563,9 @@ static int next_token (struct ddsrt_xmlp_state *st, char **payload)
}
}
if (tok == TOK_ERROR) {
char msg[512];
(void) snprintf (msg, sizeof (msg), "invalid token encountered");
st->cb.error (st->varg, msg, st->line);
st->error = 1;
}
return tok;
@ -674,10 +680,10 @@ static int parse_element (struct ddsrt_xmlp_state *st, uintptr_t parentinfo)
}
}
st->nest--;
if (next_token (st, &ename) != TOK_CLOSE_TAG || next_char (st) != '>') {
if (((tok = next_token (st, &ename)) != TOK_CLOSE_TAG && tok != TOK_SHORTHAND_CLOSE_TAG) || next_char (st) != '>') {
PE_LOCAL_ERROR ("expecting closing tag", name);
}
if (strcmp (name, ename) != 0) {
if (tok != TOK_SHORTHAND_CLOSE_TAG && strcmp (name, ename) != 0) {
PE_LOCAL_ERROR ("open/close tag mismatch", ename);
}
ret = st->cb.elem_close (st->varg, eleminfo);
@ -709,7 +715,7 @@ int ddsrt_xmlp_parse (struct ddsrt_xmlp_state *st)
return 0;
} else {
int ret = parse_element (st, 0);
if (ret < 0|| !st->require_eof || next_token (st, NULL) == TOK_EOF ) {
if (ret < 0|| !(st->options & DDSRT_XMLP_REQUIRE_EOF) || next_token (st, NULL) == TOK_EOF ) {
return ret;
} else {
return -1;