/* $Id$ */
/*
* Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
* Copyright (c) 2010, 2011 Ingo Schwarze <schwarze@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "mandoc.h"
#include "libroff.h"
#include "libmandoc.h"
/* Maximum number of nested if-else conditionals. */
#define RSTACK_MAX 128
enum rofft {
ROFF_ad,
ROFF_am,
ROFF_ami,
ROFF_am1,
ROFF_de,
ROFF_dei,
ROFF_de1,
ROFF_ds,
ROFF_el,
ROFF_hy,
ROFF_ie,
ROFF_if,
ROFF_ig,
ROFF_it,
ROFF_ne,
ROFF_nh,
ROFF_nr,
ROFF_ns,
ROFF_ps,
ROFF_rm,
ROFF_so,
ROFF_ta,
ROFF_tr,
ROFF_TS,
ROFF_TE,
ROFF_T_,
ROFF_EQ,
ROFF_EN,
ROFF_cblock,
ROFF_ccond,
ROFF_USERDEF,
ROFF_MAX
};
enum roffrule {
ROFFRULE_ALLOW,
ROFFRULE_DENY
};
struct roffstr {
char *name; /* key of symbol */
char *string; /* current value */
struct roffstr *next; /* next in list */
};
struct roff {
struct mparse *parse; /* parse point */
struct roffnode *last; /* leaf of stack */
enum roffrule rstack[RSTACK_MAX]; /* stack of !`ie' rules */
int rstackpos; /* position in rstack */
struct regset *regs; /* read/writable registers */
struct roffstr *first_string; /* user-defined strings & macros */
const char *current_string; /* value of last called user macro */
struct tbl_node *first_tbl; /* first table parsed */
struct tbl_node *last_tbl; /* last table parsed */
struct tbl_node *tbl; /* current table being parsed */
struct eqn_node *last_eqn; /* last equation parsed */
struct eqn_node *first_eqn; /* first equation parsed */
struct eqn_node *eqn; /* current equation being parsed */
};
struct roffnode {
enum rofft tok; /* type of node */
struct roffnode *parent; /* up one in stack */
int line; /* parse line */
int col; /* parse col */
char *name; /* node name, e.g. macro name */
char *end; /* end-rules: custom token */
int endspan; /* end-rules: next-line or infty */
enum roffrule rule; /* current evaluation rule */
};
#define ROFF_ARGS struct roff *r, /* parse ctx */ \
enum rofft tok, /* tok of macro */ \
char **bufp, /* input buffer */ \
size_t *szp, /* size of input buffer */ \
int ln, /* parse line */ \
int ppos, /* original pos in buffer */ \
int pos, /* current pos in buffer */ \
int *offs /* reset offset of buffer data */
typedef enum rofferr (*roffproc)(ROFF_ARGS);
struct roffmac {
const char *name; /* macro name */
roffproc proc; /* process new macro */
roffproc text; /* process as child text of macro */
roffproc sub; /* process as child of macro */
int flags;
#define ROFFMAC_STRUCT (1 << 0) /* always interpret */
struct roffmac *next;
};
struct predef {
const char *name; /* predefined input name */
const char *str; /* replacement symbol */
};
#define PREDEF(__name, __str) \
{ (__name), (__str) },
static enum rofferr roff_block(ROFF_ARGS);
static enum rofferr roff_block_text(ROFF_ARGS);
static enum rofferr roff_block_sub(ROFF_ARGS);
static enum rofferr roff_cblock(ROFF_ARGS);
static enum rofferr roff_ccond(ROFF_ARGS);
static enum rofferr roff_cond(ROFF_ARGS);
static enum rofferr roff_cond_text(ROFF_ARGS);
static enum rofferr roff_cond_sub(ROFF_ARGS);
static enum rofferr roff_ds(ROFF_ARGS);
static enum roffrule roff_evalcond(const char *, int *);
static void roff_freestr(struct roff *);
static char *roff_getname(struct roff *, char **, int, int);
static const char *roff_getstrn(const struct roff *,
const char *, size_t);
static enum rofferr roff_line_ignore(ROFF_ARGS);
static enum rofferr roff_nr(ROFF_ARGS);
static int roff_res(struct roff *,
char **, size_t *, int, int);
static enum rofferr roff_rm(ROFF_ARGS);
static void roff_setstr(struct roff *,
const char *, const char *, int);
static enum rofferr roff_so(ROFF_ARGS);
static enum rofferr roff_TE(ROFF_ARGS);
static enum rofferr roff_TS(ROFF_ARGS);
static enum rofferr roff_EQ(ROFF_ARGS);
static enum rofferr roff_EN(ROFF_ARGS);
static enum rofferr roff_T_(ROFF_ARGS);
static enum rofferr roff_userdef(ROFF_ARGS);
/* See roff_hash_find() */
#define ASCII_HI 126
#define ASCII_LO 33
#define HASHWIDTH (ASCII_HI - ASCII_LO + 1)
static struct roffmac *hash[HASHWIDTH];
static struct roffmac roffs[ROFF_MAX] = {
{ "ad", roff_line_ignore, NULL, NULL, 0, NULL },
{ "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
{ "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
{ "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
{ "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
{ "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
{ "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
{ "ds", roff_ds, NULL, NULL, 0, NULL },
{ "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
{ "hy", roff_line_ignore, NULL, NULL, 0, NULL },
{ "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
{ "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
{ "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
{ "it", roff_line_ignore, NULL, NULL, 0, NULL },
{ "ne", roff_line_ignore, NULL, NULL, 0, NULL },
{ "nh", roff_line_ignore, NULL, NULL, 0, NULL },
{ "nr", roff_nr, NULL, NULL, 0, NULL },
{ "ns", roff_line_ignore, NULL, NULL, 0, NULL },
{ "ps", roff_line_ignore, NULL, NULL, 0, NULL },
{ "rm", roff_rm, NULL, NULL, 0, NULL },
{ "so", roff_so, NULL, NULL, 0, NULL },
{ "ta", roff_line_ignore, NULL, NULL, 0, NULL },
{ "tr", roff_line_ignore, NULL, NULL, 0, NULL },
{ "TS", roff_TS, NULL, NULL, 0, NULL },
{ "TE", roff_TE, NULL, NULL, 0, NULL },
{ "T&", roff_T_, NULL, NULL, 0, NULL },
{ "EQ", roff_EQ, NULL, NULL, 0, NULL },
{ "EN", roff_EN, NULL, NULL, 0, NULL },
{ ".", roff_cblock, NULL, NULL, 0, NULL },
{ "\\}", roff_ccond, NULL, NULL, 0, NULL },
{ NULL, roff_userdef, NULL, NULL, 0, NULL },
};
/* Array of injected predefined strings. */
#define PREDEFS_MAX 38
static const struct predef predefs[PREDEFS_MAX] = {
#include "predefs.in"
};
static void roff_free1(struct roff *);
static enum rofft roff_hash_find(const char *, size_t);
static void roff_hash_init(void);
static void roffnode_cleanscope(struct roff *);
static void roffnode_push(struct roff *, enum rofft,
const char *, int, int);
static void roffnode_pop(struct roff *);
static enum rofft roff_parse(struct roff *, const char *, int *);
/* See roff_hash_find() */
#define ROFF_HASH(p) (p[0] - ASCII_LO)
static void
roff_hash_init(void)
{
struct roffmac *n;
int buc, i;
for (i = 0; i < (int)ROFF_USERDEF; i++) {
assert(roffs[i].name[0] >= ASCII_LO);
assert(roffs[i].name[0] <= ASCII_HI);
buc = ROFF_HASH(roffs[i].name);
if (NULL != (n = hash[buc])) {
for ( ; n->next; n = n->next)
/* Do nothing. */ ;
n->next = &roffs[i];
} else
hash[buc] = &roffs[i];
}
}
/*
* Look up a roff token by its name. Returns ROFF_MAX if no macro by
* the nil-terminated string name could be found.
*/
static enum rofft
roff_hash_find(const char *p, size_t s)
{
int buc;
struct roffmac *n;
/*
* libroff has an extremely simple hashtable, for the time
* being, which simply keys on the first character, which must
* be printable, then walks a chain. It works well enough until
* optimised.
*/
if (p[0] < ASCII_LO || p[0] > ASCII_HI)
return(ROFF_MAX);
buc = ROFF_HASH(p);
if (NULL == (n = hash[buc]))
return(ROFF_MAX);
for ( ; n; n = n->next)
if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
return((enum rofft)(n - roffs));
return(ROFF_MAX);
}
/*
* Pop the current node off of the stack of roff instructions currently
* pending.
*/
static void
roffnode_pop(struct roff *r)
{
struct roffnode *p;
assert(r->last);
p = r->last;
r->last = r->last->parent;
free(p->name);
free(p->end);
free(p);
}
/*
* Push a roff node onto the instruction stack. This must later be
* removed with roffnode_pop().
*/
static void
roffnode_push(struct roff *r, enum rofft tok, const char *name,
int line, int col)
{
struct roffnode *p;
p = mandoc_calloc(1, sizeof(struct roffnode));
p->tok = tok;
if (name)
p->name = mandoc_strdup(name);
p->parent = r->last;
p->line = line;
p->col = col;
p->rule = p->parent ? p->parent->rule : ROFFRULE_DENY;
r->last = p;
}
static void
roff_free1(struct roff *r)
{
struct tbl_node *t;
struct eqn_node *e;
while (NULL != (t = r->first_tbl)) {
r->first_tbl = t->next;
tbl_free(t);
}
r->first_tbl = r->last_tbl = r->tbl = NULL;
while (NULL != (e = r->first_eqn)) {
r->first_eqn = e->next;
eqn_free(e);
}
r->first_eqn = r->last_eqn = r->eqn = NULL;
while (r->last)
roffnode_pop(r);
roff_freestr(r);
}
void
roff_reset(struct roff *r)
{
int i;
roff_free1(r);
for (i = 0; i < PREDEFS_MAX; i++)
roff_setstr(r, predefs[i].name, predefs[i].str, 0);
}
void
roff_free(struct roff *r)
{
roff_free1(r);
free(r);
}
struct roff *
roff_alloc(struct regset *regs, struct mparse *parse)
{
struct roff *r;
int i;
r = mandoc_calloc(1, sizeof(struct roff));
r->regs = regs;
r->parse = parse;
r->rstackpos = -1;
roff_hash_init();
for (i = 0; i < PREDEFS_MAX; i++)
roff_setstr(r, predefs[i].name, predefs[i].str, 0);
return(r);
}
/*
* Pre-filter each and every line for reserved words (one beginning with
* `\*', e.g., `\*(ab'). These must be handled before the actual line
* is processed.
*/
static int
roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos)
{
const char *stesc; /* start of an escape sequence ('\\') */
const char *stnam; /* start of the name, after "[(*" */
const char *cp; /* end of the name, e.g. before ']' */
const char *res; /* the string to be substituted */
int i, maxl;
size_t nsz;
char *n;
/* Search for a leading backslash and save a pointer to it. */
cp = *bufp + pos;
while (NULL != (cp = strchr(cp, '\\'))) {
stesc = cp++;
/*
* The second character must be an asterisk.
* If it isn't, skip it anyway: It is escaped,
* so it can't start another escape sequence.
*/
if ('\0' == *cp)
return(1);
if ('*' != *cp++)
continue;
/*
* The third character decides the length
* of the name of the string.
* Save a pointer to the name.
*/
switch (*cp) {
case ('\0'):
return(1);
case ('('):
cp++;
maxl = 2;
break;
case ('['):
cp++;
maxl = 0;
break;
default:
maxl = 1;
break;
}
stnam = cp;
/* Advance to the end of the name. */
for (i = 0; 0 == maxl || i < maxl; i++, cp++) {
if ('\0' == *cp)
return(1); /* Error. */
if (0 == maxl && ']' == *cp)
break;
}
/*
* Retrieve the replacement string; if it is
* undefined, resume searching for escapes.
*/
res = roff_getstrn(r, stnam, (size_t)i);
if (NULL == res) {
/* TODO: keep track of the correct position. */
mandoc_msg(MANDOCERR_BADESCAPE, r->parse, ln, pos, NULL);
res = "";
}
/* Replace the escape sequence by the string. */
nsz = *szp + strlen(res) + 1;
n = mandoc_malloc(nsz);
strlcpy(n, *bufp, (size_t)(stesc - *bufp + 1));
strlcat(n, res, nsz);
strlcat(n, cp + (maxl ? 0 : 1), nsz);
free(*bufp);
*bufp = n;
*szp = nsz;
return(0);
}
return(1);
}
enum rofferr
roff_parseln(struct roff *r, int ln, char **bufp,
size_t *szp, int pos, int *offs)
{
enum rofft t;
enum rofferr e;
int ppos, ctl;
/*
* Run the reserved-word filter only if we have some reserved
* words to fill in.
*/
if (r->first_string && ! roff_res(r, bufp, szp, ln, pos))
return(ROFF_REPARSE);
ppos = pos;
ctl = mandoc_getcontrol(*bufp, &pos);
/*
* First, if a scope is open and we're not a macro, pass the
* text through the macro's filter. If a scope isn't open and
* we're not a macro, just let it through.
* Finally, if there's an equation scope open, divert it into it
* no matter our state.
*/
if (r->last && ! ctl) {
t = r->last->tok;
assert(roffs[t].text);
e = (*roffs[t].text)
(r, t, bufp, szp, ln, pos, pos, offs);
assert(ROFF_IGN == e || ROFF_CONT == e);
if (ROFF_CONT != e)
return(e);
if (r->eqn)
return(eqn_read(&r->eqn, ln, *bufp, pos, offs));
if (r->tbl)
return(tbl_read(r->tbl, ln, *bufp, pos));
return(ROFF_CONT);
} else if ( ! ctl) {
if (r->eqn)
return(eqn_read(&r->eqn, ln, *bufp, pos, offs));
if (r->tbl)
return(tbl_read(r->tbl, ln, *bufp, pos));
return(ROFF_CONT);
} else if (r->eqn)
return(eqn_read(&r->eqn, ln, *bufp, ppos, offs));
/*
* If a scope is open, go to the child handler for that macro,
* as it may want to preprocess before doing anything with it.
* Don't do so if an equation is open.
*/
if (r->last) {
t = r->last->tok;
assert(roffs[t].sub);
return((*roffs[t].sub)
(r, t, bufp, szp,
ln, ppos, pos, offs));
}
/*
* Lastly, as we've no scope open, try to look up and execute
* the new macro. If no macro is found, simply return and let
* the compilers handle it.
*/
if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos)))
return(ROFF_CONT);
assert(roffs[t].proc);
return((*roffs[t].proc)
(r, t, bufp, szp,
ln, ppos, pos, offs));
}
void
roff_endparse(struct roff *r)
{
if (r->last)
mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
r->last->line, r->last->col, NULL);
if (r->eqn) {
mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
r->eqn->eqn.line, r->eqn->eqn.pos, NULL);
eqn_end(r->eqn);
r->eqn = NULL;
}
if (r->tbl) {
mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
r->tbl->line, r->tbl->pos, NULL);
tbl_end(r->tbl);
r->tbl = NULL;
}
}
/*
* Parse a roff node's type from the input buffer. This must be in the
* form of ".foo xxx" in the usual way.
*/
static enum rofft
roff_parse(struct roff *r, const char *buf, int *pos)
{
const char *mac;
size_t maclen;
enum rofft t;
if ('\0' == buf[*pos] || '"' == buf[*pos] ||
'\t' == buf[*pos] || ' ' == buf[*pos])
return(ROFF_MAX);
/*
* We stop the macro parse at an escape, tab, space, or nil.
* However, `\}' is also a valid macro, so make sure we don't
* clobber it by seeing the `\' as the end of token.
*/
mac = buf + *pos;
maclen = strcspn(mac + 1, " \\\t\0") + 1;
t = (r->current_string = roff_getstrn(r, mac, maclen))
? ROFF_USERDEF : roff_hash_find(mac, maclen);
*pos += (int)maclen;
while (buf[*pos] && ' ' == buf[*pos])
(*pos)++;
return(t);
}
/* ARGSUSED */
static enum rofferr
roff_cblock(ROFF_ARGS)
{
/*
* A block-close `..' should only be invoked as a child of an
* ignore macro, otherwise raise a warning and just ignore it.
*/
if (NULL == r->last) {
mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
return(ROFF_IGN);
}
switch (r->last->tok) {
case (ROFF_am):
/* FALLTHROUGH */
case (ROFF_ami):
/* FALLTHROUGH */
case (ROFF_am1):
/* FALLTHROUGH */
case (ROFF_de):
/* ROFF_de1 is remapped to ROFF_de in roff_block(). */
/* FALLTHROUGH */
case (ROFF_dei):
/* FALLTHROUGH */
case (ROFF_ig):
break;
default:
mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
return(ROFF_IGN);
}
if ((*bufp)[pos])
mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
roffnode_pop(r);
roffnode_cleanscope(r);
return(ROFF_IGN);
}
static void
roffnode_cleanscope(struct roff *r)
{
while (r->last) {
if (--r->last->endspan < 0)
break;
roffnode_pop(r);
}
}
/* ARGSUSED */
static enum rofferr
roff_ccond(ROFF_ARGS)
{
if (NULL == r->last) {
mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
return(ROFF_IGN);
}
switch (r->last->tok) {
case (ROFF_el):
/* FALLTHROUGH */
case (ROFF_ie):
/* FALLTHROUGH */
case (ROFF_if):
break;
default:
mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
return(ROFF_IGN);
}
if (r->last->endspan > -1) {
mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
return(ROFF_IGN);
}
if ((*bufp)[pos])
mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
roffnode_pop(r);
roffnode_cleanscope(r);
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_block(ROFF_ARGS)
{
int sv;
size_t sz;
char *name;
name = NULL;
if (ROFF_ig != tok) {
if ('\0' == (*bufp)[pos]) {
mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
return(ROFF_IGN);
}
/*
* Re-write `de1', since we don't really care about
* groff's strange compatibility mode, into `de'.
*/
if (ROFF_de1 == tok)
tok = ROFF_de;
if (ROFF_de == tok)
name = *bufp + pos;
else
mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos,
roffs[tok].name);
while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
pos++;
while (isspace((unsigned char)(*bufp)[pos]))
(*bufp)[pos++] = '\0';
}
roffnode_push(r, tok, name, ln, ppos);
/*
* At the beginning of a `de' macro, clear the existing string
* with the same name, if there is one. New content will be
* added from roff_block_text() in multiline mode.
*/
if (ROFF_de == tok)
roff_setstr(r, name, "", 0);
if ('\0' == (*bufp)[pos])
return(ROFF_IGN);
/* If present, process the custom end-of-line marker. */
sv = pos;
while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
pos++;
/*
* Note: groff does NOT like escape characters in the input.
* Instead of detecting this, we're just going to let it fly and
* to hell with it.
*/
assert(pos > sv);
sz = (size_t)(pos - sv);
if (1 == sz && '.' == (*bufp)[sv])
return(ROFF_IGN);
r->last->end = mandoc_malloc(sz + 1);
memcpy(r->last->end, *bufp + sv, sz);
r->last->end[(int)sz] = '\0';
if ((*bufp)[pos])
mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_block_sub(ROFF_ARGS)
{
enum rofft t;
int i, j;
/*
* First check whether a custom macro exists at this level. If
* it does, then check against it. This is some of groff's
* stranger behaviours. If we encountered a custom end-scope
* tag and that tag also happens to be a "real" macro, then we
* need to try interpreting it again as a real macro. If it's
* not, then return ignore. Else continue.
*/
if (r->last->end) {
for (i = pos, j = 0; r->last->end[j]; j++, i++)
if ((*bufp)[i] != r->last->end[j])
break;
if ('\0' == r->last->end[j] &&
('\0' == (*bufp)[i] ||
' ' == (*bufp)[i] ||
'\t' == (*bufp)[i])) {
roffnode_pop(r);
roffnode_cleanscope(r);
while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
i++;
pos = i;
if (ROFF_MAX != roff_parse(r, *bufp, &pos))
return(ROFF_RERUN);
return(ROFF_IGN);
}
}
/*
* If we have no custom end-query or lookup failed, then try
* pulling it out of the hashtable.
*/
t = roff_parse(r, *bufp, &pos);
/*
* Macros other than block-end are only significant
* in `de' blocks; elsewhere, simply throw them away.
*/
if (ROFF_cblock != t) {
if (ROFF_de == tok)
roff_setstr(r, r->last->name, *bufp + ppos, 1);
return(ROFF_IGN);
}
assert(roffs[t].proc);
return((*roffs[t].proc)(r, t, bufp, szp,
ln, ppos, pos, offs));
}
/* ARGSUSED */
static enum rofferr
roff_block_text(ROFF_ARGS)
{
if (ROFF_de == tok)
roff_setstr(r, r->last->name, *bufp + pos, 1);
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_cond_sub(ROFF_ARGS)
{
enum rofft t;
enum roffrule rr;
char *ep;
rr = r->last->rule;
roffnode_cleanscope(r);
/*
* If the macro is unknown, first check if it contains a closing
* delimiter `\}'. If it does, close out our scope and return
* the currently-scoped rule (ignore or continue). Else, drop
* into the currently-scoped rule.
*/
if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos))) {
ep = &(*bufp)[pos];
for ( ; NULL != (ep = strchr(ep, '\\')); ep++) {
ep++;
if ('}' != *ep)
continue;
/*
* Make the \} go away.
* This is a little haphazard, as it's not quite
* clear how nroff does this.
* If we're at the end of line, then just chop
* off the \} and resize the buffer.
* If we aren't, then conver it to spaces.
*/
if ('\0' == *(ep + 1)) {
*--ep = '\0';
*szp -= 2;
} else
*(ep - 1) = *ep = ' ';
roff_ccond(r, ROFF_ccond, bufp, szp,
ln, pos, pos + 2, offs);
break;
}
return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
}
/*
* A denied conditional must evaluate its children if and only
* if they're either structurally required (such as loops and
* conditionals) or a closing macro.
*/
if (ROFFRULE_DENY == rr)
if ( ! (ROFFMAC_STRUCT & roffs[t].flags))
if (ROFF_ccond != t)
return(ROFF_IGN);
assert(roffs[t].proc);
return((*roffs[t].proc)(r, t, bufp, szp,
ln, ppos, pos, offs));
}
/* ARGSUSED */
static enum rofferr
roff_cond_text(ROFF_ARGS)
{
char *ep;
enum roffrule rr;
rr = r->last->rule;
roffnode_cleanscope(r);
ep = &(*bufp)[pos];
for ( ; NULL != (ep = strchr(ep, '\\')); ep++) {
ep++;
if ('}' != *ep)
continue;
*ep = '&';
roff_ccond(r, ROFF_ccond, bufp, szp,
ln, pos, pos + 2, offs);
}
return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
}
static enum roffrule
roff_evalcond(const char *v, int *pos)
{
switch (v[*pos]) {
case ('n'):
(*pos)++;
return(ROFFRULE_ALLOW);
case ('e'):
/* FALLTHROUGH */
case ('o'):
/* FALLTHROUGH */
case ('t'):
(*pos)++;
return(ROFFRULE_DENY);
default:
break;
}
while (v[*pos] && ' ' != v[*pos])
(*pos)++;
return(ROFFRULE_DENY);
}
/* ARGSUSED */
static enum rofferr
roff_line_ignore(ROFF_ARGS)
{
if (ROFF_it == tok)
mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos, "it");
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_cond(ROFF_ARGS)
{
int sv;
enum roffrule rule;
/*
* An `.el' has no conditional body: it will consume the value
* of the current rstack entry set in prior `ie' calls or
* defaults to DENY.
*
* If we're not an `el', however, then evaluate the conditional.
*/
rule = ROFF_el == tok ?
(r->rstackpos < 0 ?
ROFFRULE_DENY : r->rstack[r->rstackpos--]) :
roff_evalcond(*bufp, &pos);
sv = pos;
while (' ' == (*bufp)[pos])
pos++;
/*
* Roff is weird. If we have just white-space after the
* conditional, it's considered the BODY and we exit without
* really doing anything. Warn about this. It's probably
* wrong.
*/
if ('\0' == (*bufp)[pos] && sv != pos) {
mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
return(ROFF_IGN);
}
roffnode_push(r, tok, NULL, ln, ppos);
r->last->rule = rule;
/*
* An if-else will put the NEGATION of the current evaluated
* conditional into the stack of rules.
*/
if (ROFF_ie == tok) {
if (r->rstackpos == RSTACK_MAX - 1) {
mandoc_msg(MANDOCERR_MEM,
r->parse, ln, ppos, NULL);
return(ROFF_ERR);
}
r->rstack[++r->rstackpos] =
ROFFRULE_DENY == r->last->rule ?
ROFFRULE_ALLOW : ROFFRULE_DENY;
}
/* If the parent has false as its rule, then so do we. */
if (r->last->parent && ROFFRULE_DENY == r->last->parent->rule)
r->last->rule = ROFFRULE_DENY;
/*
* Determine scope. If we're invoked with "\{" trailing the
* conditional, then we're in a multiline scope. Else our scope
* expires on the next line.
*/
r->last->endspan = 1;
if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
r->last->endspan = -1;
pos += 2;
}
/*
* If there are no arguments on the line, the next-line scope is
* assumed.
*/
if ('\0' == (*bufp)[pos])
return(ROFF_IGN);
/* Otherwise re-run the roff parser after recalculating. */
*offs = pos;
return(ROFF_RERUN);
}
/* ARGSUSED */
static enum rofferr
roff_ds(ROFF_ARGS)
{
char *name, *string;
/*
* A symbol is named by the first word following the macro
* invocation up to a space. Its value is anything after the
* name's trailing whitespace and optional double-quote. Thus,
*
* [.ds foo "bar " ]
*
* will have `bar " ' as its value.
*/
string = *bufp + pos;
name = roff_getname(r, &string, ln, pos);
if ('\0' == *name)
return(ROFF_IGN);
/* Read past initial double-quote. */
if ('"' == *string)
string++;
/* The rest is the value. */
roff_setstr(r, name, string, 0);
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_nr(ROFF_ARGS)
{
const char *key;
char *val;
int iv;
struct reg *rg;
val = *bufp + pos;
key = roff_getname(r, &val, ln, pos);
rg = r->regs->regs;
if (0 == strcmp(key, "nS")) {
rg[(int)REG_nS].set = 1;
if ((iv = mandoc_strntou(val, strlen(val), 10)) >= 0)
rg[REG_nS].v.u = (unsigned)iv;
else
rg[(int)REG_nS].v.u = 0u;
}
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_rm(ROFF_ARGS)
{
const char *name;
char *cp;
cp = *bufp + pos;
while ('\0' != *cp) {
name = roff_getname(r, &cp, ln, (int)(cp - *bufp));
if ('\0' != *name)
roff_setstr(r, name, NULL, 0);
}
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_TE(ROFF_ARGS)
{
if (NULL == r->tbl)
mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
else
tbl_end(r->tbl);
r->tbl = NULL;
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_T_(ROFF_ARGS)
{
if (NULL == r->tbl)
mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
else
tbl_restart(ppos, ln, r->tbl);
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_EQ(ROFF_ARGS)
{
struct eqn_node *e;
assert(NULL == r->eqn);
e = eqn_alloc(ppos, ln, r->parse);
if (r->last_eqn)
r->last_eqn->next = e;
else
r->first_eqn = r->last_eqn = e;
r->eqn = r->last_eqn = e;
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_EN(ROFF_ARGS)
{
mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_TS(ROFF_ARGS)
{
struct tbl_node *t;
if (r->tbl) {
mandoc_msg(MANDOCERR_SCOPEBROKEN, r->parse, ln, ppos, NULL);
tbl_end(r->tbl);
}
t = tbl_alloc(ppos, ln, r->parse);
if (r->last_tbl)
r->last_tbl->next = t;
else
r->first_tbl = r->last_tbl = t;
r->tbl = r->last_tbl = t;
return(ROFF_IGN);
}
/* ARGSUSED */
static enum rofferr
roff_so(ROFF_ARGS)
{
char *name;
mandoc_msg(MANDOCERR_SO, r->parse, ln, ppos, NULL);
/*
* Handle `so'. Be EXTREMELY careful, as we shouldn't be
* opening anything that's not in our cwd or anything beneath
* it. Thus, explicitly disallow traversing up the file-system
* or using absolute paths.
*/
name = *bufp + pos;
if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) {
mandoc_msg(MANDOCERR_SOPATH, r->parse, ln, pos, NULL);
return(ROFF_ERR);
}
*offs = pos;
return(ROFF_SO);
}
/* ARGSUSED */
static enum rofferr
roff_userdef(ROFF_ARGS)
{
const char *arg[9];
char *cp, *n1, *n2;
int i;
/*
* Collect pointers to macro argument strings
* and null-terminate them.
*/
cp = *bufp + pos;
for (i = 0; i < 9; i++)
arg[i] = '\0' == *cp ? "" :
mandoc_getarg(r->parse, &cp, ln, &pos);
/*
* Expand macro arguments.
*/
*szp = 0;
n1 = cp = mandoc_strdup(r->current_string);
while (NULL != (cp = strstr(cp, "\\$"))) {
i = cp[2] - '1';
if (0 > i || 8 < i) {
/* Not an argument invocation. */
cp += 2;
continue;
}
*szp = strlen(n1) - 3 + strlen(arg[i]) + 1;
n2 = mandoc_malloc(*szp);
strlcpy(n2, n1, (size_t)(cp - n1 + 1));
strlcat(n2, arg[i], *szp);
strlcat(n2, cp + 3, *szp);
cp = n2 + (cp - n1);
free(n1);
n1 = n2;
}
/*
* Replace the macro invocation
* by the expanded macro.
*/
free(*bufp);
*bufp = n1;
if (0 == *szp)
*szp = strlen(*bufp) + 1;
return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ?
ROFF_REPARSE : ROFF_APPEND);
}
static char *
roff_getname(struct roff *r, char **cpp, int ln, int pos)
{
char *name, *cp;
name = *cpp;
if ('\0' == *name)
return(name);
/* Read until end of name. */
for (cp = name; '\0' != *cp && ' ' != *cp; cp++) {
if ('\\' != *cp)
continue;
cp++;
if ('\\' == *cp)
continue;
mandoc_msg(MANDOCERR_NAMESC, r->parse, ln, pos, NULL);
*cp = '\0';
name = cp;
}
/* Nil-terminate name. */
if ('\0' != *cp)
*(cp++) = '\0';
/* Read past spaces. */
while (' ' == *cp)
cp++;
*cpp = cp;
return(name);
}
/*
* Store *string into the user-defined string called *name.
* In multiline mode, append to an existing entry and append '\n';
* else replace the existing entry, if there is one.
* To clear an existing entry, call with (*r, *name, NULL, 0).
*/
static void
roff_setstr(struct roff *r, const char *name, const char *string,
int multiline)
{
struct roffstr *n;
char *c;
size_t oldch, newch;
/* Search for an existing string with the same name. */
n = r->first_string;
while (n && strcmp(name, n->name))
n = n->next;
if (NULL == n) {
/* Create a new string table entry. */
n = mandoc_malloc(sizeof(struct roffstr));
n->name = mandoc_strdup(name);
n->string = NULL;
n->next = r->first_string;
r->first_string = n;
} else if (0 == multiline) {
/* In multiline mode, append; else replace. */
free(n->string);
n->string = NULL;
}
if (NULL == string)
return;
/*
* One additional byte for the '\n' in multiline mode,
* and one for the terminating '\0'.
*/
newch = strlen(string) + (multiline ? 2u : 1u);
if (NULL == n->string) {
n->string = mandoc_malloc(newch);
*n->string = '\0';
oldch = 0;
} else {
oldch = strlen(n->string);
n->string = mandoc_realloc(n->string, oldch + newch);
}
/* Skip existing content in the destination buffer. */
c = n->string + (int)oldch;
/* Append new content to the destination buffer. */
while (*string) {
/*
* Rudimentary roff copy mode:
* Handle escaped backslashes.
*/
if ('\\' == *string && '\\' == *(string + 1))
string++;
*c++ = *string++;
}
/* Append terminating bytes. */
if (multiline)
*c++ = '\n';
*c = '\0';
}
static const char *
roff_getstrn(const struct roff *r, const char *name, size_t len)
{
const struct roffstr *n;
n = r->first_string;
while (n && (strncmp(name, n->name, len) || '\0' != n->name[(int)len]))
n = n->next;
return(n ? n->string : NULL);
}
static void
roff_freestr(struct roff *r)
{
struct roffstr *n, *nn;
for (n = r->first_string; n; n = nn) {
free(n->name);
free(n->string);
nn = n->next;
free(n);
}
r->first_string = NULL;
}
const struct tbl_span *
roff_span(const struct roff *r)
{
return(r->tbl ? tbl_span(r->tbl) : NULL);
}
const struct eqn *
roff_eqn(const struct roff *r)
{
return(r->last_eqn ? &r->last_eqn->eqn : NULL);
}
