freebsd-dev/contrib/mdocml/mdoc.c
Baptiste Daroussin 849684b013 Update mandoc to cvs snaphot from 20150302
Use the new unsupp warning level to detect the unsupported manpages in man(1)
2015-03-02 16:58:57 +00:00

900 lines
19 KiB
C

/* $Id: mdoc.c,v 1.238 2015/02/12 13:00:52 schwarze Exp $ */
/*
* Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
* Copyright (c) 2010, 2012-2015 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 AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
*/
#include "config.h"
#include <sys/types.h>
#include <assert.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "mdoc.h"
#include "mandoc.h"
#include "mandoc_aux.h"
#include "libmdoc.h"
#include "libmandoc.h"
const char *const __mdoc_macronames[MDOC_MAX + 1] = {
"Ap", "Dd", "Dt", "Os",
"Sh", "Ss", "Pp", "D1",
"Dl", "Bd", "Ed", "Bl",
"El", "It", "Ad", "An",
"Ar", "Cd", "Cm", "Dv",
"Er", "Ev", "Ex", "Fa",
"Fd", "Fl", "Fn", "Ft",
"Ic", "In", "Li", "Nd",
"Nm", "Op", "Ot", "Pa",
"Rv", "St", "Va", "Vt",
"Xr", "%A", "%B", "%D",
"%I", "%J", "%N", "%O",
"%P", "%R", "%T", "%V",
"Ac", "Ao", "Aq", "At",
"Bc", "Bf", "Bo", "Bq",
"Bsx", "Bx", "Db", "Dc",
"Do", "Dq", "Ec", "Ef",
"Em", "Eo", "Fx", "Ms",
"No", "Ns", "Nx", "Ox",
"Pc", "Pf", "Po", "Pq",
"Qc", "Ql", "Qo", "Qq",
"Re", "Rs", "Sc", "So",
"Sq", "Sm", "Sx", "Sy",
"Tn", "Ux", "Xc", "Xo",
"Fo", "Fc", "Oo", "Oc",
"Bk", "Ek", "Bt", "Hf",
"Fr", "Ud", "Lb", "Lp",
"Lk", "Mt", "Brq", "Bro",
"Brc", "%C", "Es", "En",
"Dx", "%Q", "br", "sp",
"%U", "Ta", "ll", "text",
};
const char *const __mdoc_argnames[MDOC_ARG_MAX] = {
"split", "nosplit", "ragged",
"unfilled", "literal", "file",
"offset", "bullet", "dash",
"hyphen", "item", "enum",
"tag", "diag", "hang",
"ohang", "inset", "column",
"width", "compact", "std",
"filled", "words", "emphasis",
"symbolic", "nested", "centered"
};
const char * const *mdoc_macronames = __mdoc_macronames;
const char * const *mdoc_argnames = __mdoc_argnames;
static void mdoc_node_free(struct mdoc_node *);
static void mdoc_node_unlink(struct mdoc *,
struct mdoc_node *);
static void mdoc_free1(struct mdoc *);
static void mdoc_alloc1(struct mdoc *);
static struct mdoc_node *node_alloc(struct mdoc *, int, int,
enum mdoct, enum mdoc_type);
static void node_append(struct mdoc *, struct mdoc_node *);
static int mdoc_ptext(struct mdoc *, int, char *, int);
static int mdoc_pmacro(struct mdoc *, int, char *, int);
const struct mdoc_node *
mdoc_node(const struct mdoc *mdoc)
{
return(mdoc->first);
}
const struct mdoc_meta *
mdoc_meta(const struct mdoc *mdoc)
{
return(&mdoc->meta);
}
/*
* Frees volatile resources (parse tree, meta-data, fields).
*/
static void
mdoc_free1(struct mdoc *mdoc)
{
if (mdoc->first)
mdoc_node_delete(mdoc, mdoc->first);
free(mdoc->meta.msec);
free(mdoc->meta.vol);
free(mdoc->meta.arch);
free(mdoc->meta.date);
free(mdoc->meta.title);
free(mdoc->meta.os);
free(mdoc->meta.name);
}
/*
* Allocate all volatile resources (parse tree, meta-data, fields).
*/
static void
mdoc_alloc1(struct mdoc *mdoc)
{
memset(&mdoc->meta, 0, sizeof(struct mdoc_meta));
mdoc->flags = 0;
mdoc->lastnamed = mdoc->lastsec = SEC_NONE;
mdoc->last = mandoc_calloc(1, sizeof(struct mdoc_node));
mdoc->first = mdoc->last;
mdoc->last->type = MDOC_ROOT;
mdoc->last->tok = MDOC_MAX;
mdoc->next = MDOC_NEXT_CHILD;
}
/*
* Free up volatile resources (see mdoc_free1()) then re-initialises the
* data with mdoc_alloc1(). After invocation, parse data has been reset
* and the parser is ready for re-invocation on a new tree; however,
* cross-parse non-volatile data is kept intact.
*/
void
mdoc_reset(struct mdoc *mdoc)
{
mdoc_free1(mdoc);
mdoc_alloc1(mdoc);
}
/*
* Completely free up all volatile and non-volatile parse resources.
* After invocation, the pointer is no longer usable.
*/
void
mdoc_free(struct mdoc *mdoc)
{
mdoc_free1(mdoc);
free(mdoc);
}
/*
* Allocate volatile and non-volatile parse resources.
*/
struct mdoc *
mdoc_alloc(struct roff *roff, struct mparse *parse,
const char *defos, int quick)
{
struct mdoc *p;
p = mandoc_calloc(1, sizeof(struct mdoc));
p->parse = parse;
p->defos = defos;
p->quick = quick;
p->roff = roff;
mdoc_hash_init();
mdoc_alloc1(p);
return(p);
}
void
mdoc_endparse(struct mdoc *mdoc)
{
mdoc_macroend(mdoc);
}
void
mdoc_addeqn(struct mdoc *mdoc, const struct eqn *ep)
{
struct mdoc_node *n;
n = node_alloc(mdoc, ep->ln, ep->pos, MDOC_MAX, MDOC_EQN);
n->eqn = ep;
if (ep->ln > mdoc->last->line)
n->flags |= MDOC_LINE;
node_append(mdoc, n);
mdoc->next = MDOC_NEXT_SIBLING;
}
void
mdoc_addspan(struct mdoc *mdoc, const struct tbl_span *sp)
{
struct mdoc_node *n;
n = node_alloc(mdoc, sp->line, 0, MDOC_MAX, MDOC_TBL);
n->span = sp;
node_append(mdoc, n);
mdoc->next = MDOC_NEXT_SIBLING;
}
/*
* Main parse routine. Parses a single line -- really just hands off to
* the macro (mdoc_pmacro()) or text parser (mdoc_ptext()).
*/
int
mdoc_parseln(struct mdoc *mdoc, int ln, char *buf, int offs)
{
if (mdoc->last->type != MDOC_EQN || ln > mdoc->last->line)
mdoc->flags |= MDOC_NEWLINE;
/*
* Let the roff nS register switch SYNOPSIS mode early,
* such that the parser knows at all times
* whether this mode is on or off.
* Note that this mode is also switched by the Sh macro.
*/
if (roff_getreg(mdoc->roff, "nS"))
mdoc->flags |= MDOC_SYNOPSIS;
else
mdoc->flags &= ~MDOC_SYNOPSIS;
return(roff_getcontrol(mdoc->roff, buf, &offs) ?
mdoc_pmacro(mdoc, ln, buf, offs) :
mdoc_ptext(mdoc, ln, buf, offs));
}
void
mdoc_macro(MACRO_PROT_ARGS)
{
assert(tok < MDOC_MAX);
if (mdoc->flags & MDOC_PBODY) {
if (tok == MDOC_Dt) {
mandoc_vmsg(MANDOCERR_DT_LATE,
mdoc->parse, line, ppos,
"Dt %s", buf + *pos);
return;
}
} else if ( ! (mdoc_macros[tok].flags & MDOC_PROLOGUE)) {
if (mdoc->meta.title == NULL) {
mandoc_vmsg(MANDOCERR_DT_NOTITLE,
mdoc->parse, line, ppos, "%s %s",
mdoc_macronames[tok], buf + *pos);
mdoc->meta.title = mandoc_strdup("UNTITLED");
}
if (NULL == mdoc->meta.vol)
mdoc->meta.vol = mandoc_strdup("LOCAL");
mdoc->flags |= MDOC_PBODY;
}
(*mdoc_macros[tok].fp)(mdoc, tok, line, ppos, pos, buf);
}
static void
node_append(struct mdoc *mdoc, struct mdoc_node *p)
{
assert(mdoc->last);
assert(mdoc->first);
assert(MDOC_ROOT != p->type);
switch (mdoc->next) {
case MDOC_NEXT_SIBLING:
mdoc->last->next = p;
p->prev = mdoc->last;
p->parent = mdoc->last->parent;
break;
case MDOC_NEXT_CHILD:
mdoc->last->child = p;
p->parent = mdoc->last;
break;
default:
abort();
/* NOTREACHED */
}
p->parent->nchild++;
/*
* Copy over the normalised-data pointer of our parent. Not
* everybody has one, but copying a null pointer is fine.
*/
switch (p->type) {
case MDOC_BODY:
if (ENDBODY_NOT != p->end)
break;
/* FALLTHROUGH */
case MDOC_TAIL:
/* FALLTHROUGH */
case MDOC_HEAD:
p->norm = p->parent->norm;
break;
default:
break;
}
mdoc_valid_pre(mdoc, p);
switch (p->type) {
case MDOC_HEAD:
assert(MDOC_BLOCK == p->parent->type);
p->parent->head = p;
break;
case MDOC_TAIL:
assert(MDOC_BLOCK == p->parent->type);
p->parent->tail = p;
break;
case MDOC_BODY:
if (p->end)
break;
assert(MDOC_BLOCK == p->parent->type);
p->parent->body = p;
break;
default:
break;
}
mdoc->last = p;
switch (p->type) {
case MDOC_TBL:
/* FALLTHROUGH */
case MDOC_TEXT:
mdoc_valid_post(mdoc);
break;
default:
break;
}
}
static struct mdoc_node *
node_alloc(struct mdoc *mdoc, int line, int pos,
enum mdoct tok, enum mdoc_type type)
{
struct mdoc_node *p;
p = mandoc_calloc(1, sizeof(struct mdoc_node));
p->sec = mdoc->lastsec;
p->line = line;
p->pos = pos;
p->tok = tok;
p->type = type;
/* Flag analysis. */
if (MDOC_SYNOPSIS & mdoc->flags)
p->flags |= MDOC_SYNPRETTY;
else
p->flags &= ~MDOC_SYNPRETTY;
if (MDOC_NEWLINE & mdoc->flags)
p->flags |= MDOC_LINE;
mdoc->flags &= ~MDOC_NEWLINE;
return(p);
}
void
mdoc_tail_alloc(struct mdoc *mdoc, int line, int pos, enum mdoct tok)
{
struct mdoc_node *p;
p = node_alloc(mdoc, line, pos, tok, MDOC_TAIL);
node_append(mdoc, p);
mdoc->next = MDOC_NEXT_CHILD;
}
struct mdoc_node *
mdoc_head_alloc(struct mdoc *mdoc, int line, int pos, enum mdoct tok)
{
struct mdoc_node *p;
assert(mdoc->first);
assert(mdoc->last);
p = node_alloc(mdoc, line, pos, tok, MDOC_HEAD);
node_append(mdoc, p);
mdoc->next = MDOC_NEXT_CHILD;
return(p);
}
struct mdoc_node *
mdoc_body_alloc(struct mdoc *mdoc, int line, int pos, enum mdoct tok)
{
struct mdoc_node *p;
p = node_alloc(mdoc, line, pos, tok, MDOC_BODY);
node_append(mdoc, p);
mdoc->next = MDOC_NEXT_CHILD;
return(p);
}
struct mdoc_node *
mdoc_endbody_alloc(struct mdoc *mdoc, int line, int pos, enum mdoct tok,
struct mdoc_node *body, enum mdoc_endbody end)
{
struct mdoc_node *p;
body->flags |= MDOC_ENDED;
body->parent->flags |= MDOC_ENDED;
p = node_alloc(mdoc, line, pos, tok, MDOC_BODY);
p->body = body;
p->norm = body->norm;
p->end = end;
node_append(mdoc, p);
mdoc->next = MDOC_NEXT_SIBLING;
return(p);
}
struct mdoc_node *
mdoc_block_alloc(struct mdoc *mdoc, int line, int pos,
enum mdoct tok, struct mdoc_arg *args)
{
struct mdoc_node *p;
p = node_alloc(mdoc, line, pos, tok, MDOC_BLOCK);
p->args = args;
if (p->args)
(args->refcnt)++;
switch (tok) {
case MDOC_Bd:
/* FALLTHROUGH */
case MDOC_Bf:
/* FALLTHROUGH */
case MDOC_Bl:
/* FALLTHROUGH */
case MDOC_En:
/* FALLTHROUGH */
case MDOC_Rs:
p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
break;
default:
break;
}
node_append(mdoc, p);
mdoc->next = MDOC_NEXT_CHILD;
return(p);
}
void
mdoc_elem_alloc(struct mdoc *mdoc, int line, int pos,
enum mdoct tok, struct mdoc_arg *args)
{
struct mdoc_node *p;
p = node_alloc(mdoc, line, pos, tok, MDOC_ELEM);
p->args = args;
if (p->args)
(args->refcnt)++;
switch (tok) {
case MDOC_An:
p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
break;
default:
break;
}
node_append(mdoc, p);
mdoc->next = MDOC_NEXT_CHILD;
}
void
mdoc_word_alloc(struct mdoc *mdoc, int line, int pos, const char *p)
{
struct mdoc_node *n;
n = node_alloc(mdoc, line, pos, MDOC_MAX, MDOC_TEXT);
n->string = roff_strdup(mdoc->roff, p);
node_append(mdoc, n);
mdoc->next = MDOC_NEXT_SIBLING;
}
void
mdoc_word_append(struct mdoc *mdoc, const char *p)
{
struct mdoc_node *n;
char *addstr, *newstr;
n = mdoc->last;
addstr = roff_strdup(mdoc->roff, p);
mandoc_asprintf(&newstr, "%s %s", n->string, addstr);
free(addstr);
free(n->string);
n->string = newstr;
mdoc->next = MDOC_NEXT_SIBLING;
}
static void
mdoc_node_free(struct mdoc_node *p)
{
if (MDOC_BLOCK == p->type || MDOC_ELEM == p->type)
free(p->norm);
if (p->string)
free(p->string);
if (p->args)
mdoc_argv_free(p->args);
free(p);
}
static void
mdoc_node_unlink(struct mdoc *mdoc, struct mdoc_node *n)
{
/* Adjust siblings. */
if (n->prev)
n->prev->next = n->next;
if (n->next)
n->next->prev = n->prev;
/* Adjust parent. */
if (n->parent) {
n->parent->nchild--;
if (n->parent->child == n)
n->parent->child = n->prev ? n->prev : n->next;
if (n->parent->last == n)
n->parent->last = n->prev ? n->prev : NULL;
}
/* Adjust parse point, if applicable. */
if (mdoc && mdoc->last == n) {
if (n->prev) {
mdoc->last = n->prev;
mdoc->next = MDOC_NEXT_SIBLING;
} else {
mdoc->last = n->parent;
mdoc->next = MDOC_NEXT_CHILD;
}
}
if (mdoc && mdoc->first == n)
mdoc->first = NULL;
}
void
mdoc_node_delete(struct mdoc *mdoc, struct mdoc_node *p)
{
while (p->child) {
assert(p->nchild);
mdoc_node_delete(mdoc, p->child);
}
assert(0 == p->nchild);
mdoc_node_unlink(mdoc, p);
mdoc_node_free(p);
}
void
mdoc_node_relink(struct mdoc *mdoc, struct mdoc_node *p)
{
mdoc_node_unlink(mdoc, p);
node_append(mdoc, p);
}
/*
* Parse free-form text, that is, a line that does not begin with the
* control character.
*/
static int
mdoc_ptext(struct mdoc *mdoc, int line, char *buf, int offs)
{
char *c, *ws, *end;
struct mdoc_node *n;
assert(mdoc->last);
n = mdoc->last;
/*
* Divert directly to list processing if we're encountering a
* columnar MDOC_BLOCK with or without a prior MDOC_BLOCK entry
* (a MDOC_BODY means it's already open, in which case we should
* process within its context in the normal way).
*/
if (n->tok == MDOC_Bl && n->type == MDOC_BODY &&
n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) {
/* `Bl' is open without any children. */
mdoc->flags |= MDOC_FREECOL;
mdoc_macro(mdoc, MDOC_It, line, offs, &offs, buf);
return(1);
}
if (MDOC_It == n->tok && MDOC_BLOCK == n->type &&
NULL != n->parent &&
MDOC_Bl == n->parent->tok &&
LIST_column == n->parent->norm->Bl.type) {
/* `Bl' has block-level `It' children. */
mdoc->flags |= MDOC_FREECOL;
mdoc_macro(mdoc, MDOC_It, line, offs, &offs, buf);
return(1);
}
/*
* Search for the beginning of unescaped trailing whitespace (ws)
* and for the first character not to be output (end).
*/
/* FIXME: replace with strcspn(). */
ws = NULL;
for (c = end = buf + offs; *c; c++) {
switch (*c) {
case ' ':
if (NULL == ws)
ws = c;
continue;
case '\t':
/*
* Always warn about trailing tabs,
* even outside literal context,
* where they should be put on the next line.
*/
if (NULL == ws)
ws = c;
/*
* Strip trailing tabs in literal context only;
* outside, they affect the next line.
*/
if (MDOC_LITERAL & mdoc->flags)
continue;
break;
case '\\':
/* Skip the escaped character, too, if any. */
if (c[1])
c++;
/* FALLTHROUGH */
default:
ws = NULL;
break;
}
end = c + 1;
}
*end = '\0';
if (ws)
mandoc_msg(MANDOCERR_SPACE_EOL, mdoc->parse,
line, (int)(ws-buf), NULL);
if (buf[offs] == '\0' && ! (mdoc->flags & MDOC_LITERAL)) {
mandoc_msg(MANDOCERR_FI_BLANK, mdoc->parse,
line, (int)(c - buf), NULL);
/*
* Insert a `sp' in the case of a blank line. Technically,
* blank lines aren't allowed, but enough manuals assume this
* behaviour that we want to work around it.
*/
mdoc_elem_alloc(mdoc, line, offs, MDOC_sp, NULL);
mdoc->next = MDOC_NEXT_SIBLING;
mdoc_valid_post(mdoc);
return(1);
}
mdoc_word_alloc(mdoc, line, offs, buf+offs);
if (mdoc->flags & MDOC_LITERAL)
return(1);
/*
* End-of-sentence check. If the last character is an unescaped
* EOS character, then flag the node as being the end of a
* sentence. The front-end will know how to interpret this.
*/
assert(buf < end);
if (mandoc_eos(buf+offs, (size_t)(end-buf-offs)))
mdoc->last->flags |= MDOC_EOS;
return(1);
}
/*
* Parse a macro line, that is, a line beginning with the control
* character.
*/
static int
mdoc_pmacro(struct mdoc *mdoc, int ln, char *buf, int offs)
{
struct mdoc_node *n;
const char *cp;
enum mdoct tok;
int i, sv;
char mac[5];
sv = offs;
/*
* Copy the first word into a nil-terminated buffer.
* Stop when a space, tab, escape, or eoln is encountered.
*/
i = 0;
while (i < 4 && strchr(" \t\\", buf[offs]) == NULL)
mac[i++] = buf[offs++];
mac[i] = '\0';
tok = (i > 1 && i < 4) ? mdoc_hash_find(mac) : MDOC_MAX;
if (tok == MDOC_MAX) {
mandoc_msg(MANDOCERR_MACRO, mdoc->parse,
ln, sv, buf + sv - 1);
return(1);
}
/* Skip a leading escape sequence or tab. */
switch (buf[offs]) {
case '\\':
cp = buf + offs + 1;
mandoc_escape(&cp, NULL, NULL);
offs = cp - buf;
break;
case '\t':
offs++;
break;
default:
break;
}
/* Jump to the next non-whitespace word. */
while (buf[offs] && ' ' == buf[offs])
offs++;
/*
* Trailing whitespace. Note that tabs are allowed to be passed
* into the parser as "text", so we only warn about spaces here.
*/
if ('\0' == buf[offs] && ' ' == buf[offs - 1])
mandoc_msg(MANDOCERR_SPACE_EOL, mdoc->parse,
ln, offs - 1, NULL);
/*
* If an initial macro or a list invocation, divert directly
* into macro processing.
*/
if (NULL == mdoc->last || MDOC_It == tok || MDOC_El == tok) {
mdoc_macro(mdoc, tok, ln, sv, &offs, buf);
return(1);
}
n = mdoc->last;
assert(mdoc->last);
/*
* If the first macro of a `Bl -column', open an `It' block
* context around the parsed macro.
*/
if (n->tok == MDOC_Bl && n->type == MDOC_BODY &&
n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) {
mdoc->flags |= MDOC_FREECOL;
mdoc_macro(mdoc, MDOC_It, ln, sv, &sv, buf);
return(1);
}
/*
* If we're following a block-level `It' within a `Bl -column'
* context (perhaps opened in the above block or in ptext()),
* then open an `It' block context around the parsed macro.
*/
if (MDOC_It == n->tok && MDOC_BLOCK == n->type &&
NULL != n->parent &&
MDOC_Bl == n->parent->tok &&
LIST_column == n->parent->norm->Bl.type) {
mdoc->flags |= MDOC_FREECOL;
mdoc_macro(mdoc, MDOC_It, ln, sv, &sv, buf);
return(1);
}
/* Normal processing of a macro. */
mdoc_macro(mdoc, tok, ln, sv, &offs, buf);
/* In quick mode (for mandocdb), abort after the NAME section. */
if (mdoc->quick && MDOC_Sh == tok &&
SEC_NAME != mdoc->last->sec)
return(2);
return(1);
}
enum mdelim
mdoc_isdelim(const char *p)
{
if ('\0' == p[0])
return(DELIM_NONE);
if ('\0' == p[1])
switch (p[0]) {
case '(':
/* FALLTHROUGH */
case '[':
return(DELIM_OPEN);
case '|':
return(DELIM_MIDDLE);
case '.':
/* FALLTHROUGH */
case ',':
/* FALLTHROUGH */
case ';':
/* FALLTHROUGH */
case ':':
/* FALLTHROUGH */
case '?':
/* FALLTHROUGH */
case '!':
/* FALLTHROUGH */
case ')':
/* FALLTHROUGH */
case ']':
return(DELIM_CLOSE);
default:
return(DELIM_NONE);
}
if ('\\' != p[0])
return(DELIM_NONE);
if (0 == strcmp(p + 1, "."))
return(DELIM_CLOSE);
if (0 == strcmp(p + 1, "fR|\\fP"))
return(DELIM_MIDDLE);
return(DELIM_NONE);
}
void
mdoc_deroff(char **dest, const struct mdoc_node *n)
{
char *cp;
size_t sz;
if (MDOC_TEXT != n->type) {
for (n = n->child; n; n = n->next)
mdoc_deroff(dest, n);
return;
}
/* Skip leading whitespace. */
for (cp = n->string; '\0' != *cp; cp++)
if (0 == isspace((unsigned char)*cp))
break;
/* Skip trailing whitespace. */
for (sz = strlen(cp); sz; sz--)
if (0 == isspace((unsigned char)cp[sz-1]))
break;
/* Skip empty strings. */
if (0 == sz)
return;
if (NULL == *dest) {
*dest = mandoc_strndup(cp, sz);
return;
}
mandoc_asprintf(&cp, "%s %*s", *dest, (int)sz, cp);
free(*dest);
*dest = cp;
}