simple implementation of the roff(7) .als (macro alias) request,

[mandoc.git] / read.c

diff --git a/read.c b/read.c
index 13b25778d740e1f365907736ed8ea30574b1d30d..f86d57003a9726b9f4bea2adf1b974f498d5084d 100644 (file)
--- a/read.c
+++ b/read.c
@@ -1,7 +1,7 @@
-/*     $Id: read.c,v 1.144 2015/10/13 22:59:54 schwarze Exp $ */
+/*     $Id: read.c,v 1.176 2017/06/11 19:37:01 schwarze Exp $ */

 /*
  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 /*
  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>

- * Copyright (c) 2010-2015 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2010-2017 Ingo Schwarze <schwarze@openbsd.org>

  * Copyright (c) 2010, 2012 Joerg Sonnenberger <joerg@netbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * Copyright (c) 2010, 2012 Joerg Sonnenberger <joerg@netbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any


@@ -19,18 +19,17 @@
 #include "config.h"
 
 #include <sys/types.h>
 #include "config.h"
 
 #include <sys/types.h>

-#if HAVE_MMAP

 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/mman.h>
 #include <sys/stat.h>

-#endif

 
 #include <assert.h>
 #include <ctype.h>
 
 #include <assert.h>
 #include <ctype.h>

+#if HAVE_ERR

 #include <err.h>
 #include <err.h>

+#endif

 #include <errno.h>
 #include <fcntl.h>
 #include <stdarg.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdarg.h>

-#include <stdint.h>

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>


@@ -48,8 +47,8 @@
 #define        REPARSE_LIMIT   1000
 
 struct mparse {
 #define        REPARSE_LIMIT   1000
 
 struct mparse {

-       struct roff_man  *man; /* man parser */

        struct roff      *roff; /* roff parser (!NULL) */
        struct roff      *roff; /* roff parser (!NULL) */

+       struct roff_man  *man; /* man parser */

        char             *sodest; /* filename pointed to by .so */
        const char       *file; /* filename of current input file */
        struct buf       *primary; /* buffer currently being parsed */
        char             *sodest; /* filename pointed to by .so */
        const char       *file; /* filename of current input file */
        struct buf       *primary; /* buffer currently being parsed */


@@ -67,7 +66,7 @@ struct        mparse {
 
 static void      choose_parser(struct mparse *);
 static void      resize_buf(struct buf *, size_t);
 
 static void      choose_parser(struct mparse *);
 static void      resize_buf(struct buf *, size_t);

-static void      mparse_buf_r(struct mparse *, struct buf, size_t, int);
+static int       mparse_buf_r(struct mparse *, struct buf, size_t, int);

 static int       read_whole_file(struct mparse *, const char *, int,
                                struct buf *, int *);
 static void      mparse_end(struct mparse *);
 static int       read_whole_file(struct mparse *, const char *, int,
                                struct buf *, int *);
 static void      mparse_end(struct mparse *);


@@ -76,7 +75,7 @@ static        void      mparse_parse_buffer(struct mparse *, struct buf,
 
 static const enum mandocerr    mandoclimits[MANDOCLEVEL_MAX] = {
        MANDOCERR_OK,
 
 static const enum mandocerr    mandoclimits[MANDOCLEVEL_MAX] = {
        MANDOCERR_OK,

-       MANDOCERR_WARNING,
+       MANDOCERR_STYLE,

        MANDOCERR_WARNING,
        MANDOCERR_ERROR,
        MANDOCERR_UNSUPP,
        MANDOCERR_WARNING,
        MANDOCERR_ERROR,
        MANDOCERR_UNSUPP,


@@ -87,6 +86,19 @@ static       const enum mandocerr    mandoclimits[MANDOCLEVEL_MAX] = {
 static const char * const      mandocerrs[MANDOCERR_MAX] = {
        "ok",
 
 static const char * const      mandocerrs[MANDOCERR_MAX] = {
        "ok",
 

+       "generic style suggestion",
+
+       "Mdocdate found",
+       "Mdocdate missing",
+       "legacy man(7) date format",
+       "useless macro",
+       "consider using OS macro",
+       "errnos out of order",
+       "duplicate errno",
+       "description line ends with a full stop",
+       "no blank before trailing delimiter",
+       "function name without markup",
+

        "generic warning",
 
        /* related to the prologue */
        "generic warning",
 
        /* related to the prologue */


@@ -108,11 +120,13 @@ static    const char * const      mandocerrs[MANDOCERR_MAX] = {
        "no document body",
        "content before first section header",
        "first section is not \"NAME\"",
        "no document body",
        "content before first section header",
        "first section is not \"NAME\"",

-       "NAME section without name",
+       "NAME section without Nm before Nd",

        "NAME section without description",
        "description not at the end of NAME",
        "bad NAME section content",
        "NAME section without description",
        "description not at the end of NAME",
        "bad NAME section content",

+       "missing comma before name",

        "missing description line, using \"\"",
        "missing description line, using \"\"",

+       "description line outside NAME section",

        "sections out of conventional order",
        "duplicate section title",
        "unexpected section",
        "sections out of conventional order",
        "duplicate section title",
        "unexpected section",


@@ -132,6 +146,7 @@ static      const char * const      mandocerrs[MANDOCERR_MAX] = {
        "fill mode already enabled, skipping",
        "fill mode already disabled, skipping",
        "line scope broken",
        "fill mode already enabled, skipping",
        "fill mode already disabled, skipping",
        "line scope broken",

+       "skipping blank line in line scope",

 
        /* related to missing macro arguments */
        "skipping empty request",
 
        /* related to missing macro arguments */
        "skipping empty request",


@@ -141,7 +156,7 @@ static      const char * const      mandocerrs[MANDOCERR_MAX] = {
        "empty argument, using 0n",
        "missing display type, using -ragged",
        "list type is not the first argument",
        "empty argument, using 0n",
        "missing display type, using -ragged",
        "list type is not the first argument",

-       "missing -width in -tag list, using 8n",
+       "missing -width in -tag list, using 6n",

        "missing utility name, using \"\"",
        "missing function name, using \"\"",
        "empty head in list item",
        "missing utility name, using \"\"",
        "missing function name, using \"\"",
        "empty head in list item",


@@ -150,6 +165,7 @@ static      const char * const      mandocerrs[MANDOCERR_MAX] = {
        "unknown font type, using \\fR",
        "nothing follows prefix",
        "empty reference block",
        "unknown font type, using \\fR",
        "nothing follows prefix",
        "empty reference block",

+       "missing section argument",

        "missing -std argument, adding it",
        "missing option string, using \"\"",
        "missing resource identifier, using \"\"",
        "missing -std argument, adding it",
        "missing option string, using \"\"",
        "missing resource identifier, using \"\"",


@@ -166,6 +182,7 @@ static      const char * const      mandocerrs[MANDOCERR_MAX] = {
        "unknown AT&T UNIX version",
        "comma in function argument",
        "parenthesis in function name",
        "unknown AT&T UNIX version",
        "comma in function argument",
        "parenthesis in function name",

+       "unknown library name",

        "invalid content in Rs block",
        "invalid Boolean argument",
        "unknown font, skipping request",
        "invalid content in Rs block",
        "invalid Boolean argument",
        "unknown font, skipping request",


@@ -175,6 +192,7 @@ static      const char * const      mandocerrs[MANDOCERR_MAX] = {
        "blank line in fill mode, using .sp",
        "tab in filled text",
        "whitespace at end of input line",
        "blank line in fill mode, using .sp",
        "tab in filled text",
        "whitespace at end of input line",

+       "new sentence, new line",

        "bad comment style",
        "invalid escape sequence",
        "undefined string, using \"\"",
        "bad comment style",
        "invalid escape sequence",
        "undefined string, using \"\"",


@@ -215,7 +233,9 @@ static      const char * const      mandocerrs[MANDOCERR_MAX] = {
        /* related to request and macro arguments */
        "escaped character not allowed in a name",
        "NOT IMPLEMENTED: Bd -file",
        /* related to request and macro arguments */
        "escaped character not allowed in a name",
        "NOT IMPLEMENTED: Bd -file",

+       "skipping display without arguments",

        "missing list type, using -item",
        "missing list type, using -item",

+       "argument is not numeric, using 1",

        "missing manual name, using \"\"",
        "uname(3) system call failed, using UNKNOWN",
        "unknown standard specifier",
        "missing manual name, using \"\"",
        "uname(3) system call failed, using UNKNOWN",
        "unknown standard specifier",


@@ -237,7 +257,7 @@ static      const char * const      mandocerrs[MANDOCERR_MAX] = {
 
 static const char * const      mandoclevels[MANDOCLEVEL_MAX] = {
        "SUCCESS",
 
 static const char * const      mandoclevels[MANDOCLEVEL_MAX] = {
        "SUCCESS",

-       "RESERVED",
+       "STYLE",

        "WARNING",
        "ERROR",
        "UNSUPP",
        "WARNING",
        "ERROR",
        "UNSUPP",


@@ -288,22 +308,16 @@ choose_parser(struct mparse *curp)
                }
        }
 
                }
        }
 

-       if (curp->man == NULL) {
-               curp->man = roff_man_alloc(curp->roff, curp, curp->defos,
-                   curp->options & MPARSE_QUICK ? 1 : 0);
-               curp->man->macroset = MACROSET_MAN;
-               curp->man->first->tok = TOKEN_NONE;
-       }
-

        if (format == MPARSE_MDOC) {
        if (format == MPARSE_MDOC) {

-               mdoc_hash_init();

                curp->man->macroset = MACROSET_MDOC;
                curp->man->macroset = MACROSET_MDOC;

-               curp->man->first->tok = TOKEN_NONE;
+               if (curp->man->mdocmac == NULL)
+                       curp->man->mdocmac = roffhash_alloc(MDOC_Dd, MDOC_MAX);

        } else {
        } else {

-               man_hash_init();

                curp->man->macroset = MACROSET_MAN;
                curp->man->macroset = MACROSET_MAN;

-               curp->man->first->tok = TOKEN_NONE;
+               if (curp->man->manmac == NULL)
+                       curp->man->manmac = roffhash_alloc(MAN_TH, MAN_MAX);

        }
        }

+       curp->man->first->tok = TOKEN_NONE;

 }
 
 /*
 }
 
 /*


@@ -313,7 +327,7 @@ choose_parser(struct mparse *curp)
  * macros, inline equations, and input line traps)
  * and indirectly (for .so file inclusion).
  */
  * macros, inline equations, and input line traps)
  * and indirectly (for .so file inclusion).
  */

-static void
+static int

 mparse_buf_r(struct mparse *curp, struct buf blk, size_t i, int start)
 {
        const struct tbl_span   *span;
 mparse_buf_r(struct mparse *curp, struct buf blk, size_t i, int start)
 {
        const struct tbl_span   *span;


@@ -402,72 +416,14 @@ mparse_buf_r(struct mparse *curp, struct buf blk, size_t i, int start)
                                continue;
                        }
 
                                continue;
                        }
 

-                       /* Trailing backslash = a plain char. */
-
-                       if (blk.buf[i] != '\\' || i + 1 == blk.sz) {
-                               ln.buf[pos++] = blk.buf[i++];
-                               continue;
-                       }
-
-                       /*
-                        * Found escape and at least one other character.
-                        * When it's a newline character, skip it.
-                        * When there is a carriage return in between,
-                        * skip that one as well.
-                        */
-
-                       if ('\r' == blk.buf[i + 1] && i + 2 < blk.sz &&
-                           '\n' == blk.buf[i + 2])
-                               ++i;
-                       if ('\n' == blk.buf[i + 1]) {
-                               i += 2;
-                               ++lnn;
-                               continue;
-                       }
-
-                       if ('"' == blk.buf[i + 1] || '#' == blk.buf[i + 1]) {
-                               i += 2;
-                               /* Comment, skip to end of line */
-                               for (; i < blk.sz; ++i) {
-                                       if ('\n' == blk.buf[i]) {
-                                               ++i;
-                                               ++lnn;
-                                               break;
-                                       }
-                               }
-
-                               /* Backout trailing whitespaces */
-                               for (; pos > 0; --pos) {
-                                       if (ln.buf[pos - 1] != ' ')
-                                               break;
-                                       if (pos > 2 && ln.buf[pos - 2] == '\\')
-                                               break;
-                               }
-                               break;
-                       }
-
-                       /* Catch escaped bogus characters. */
-
-                       c = (unsigned char) blk.buf[i+1];
-
-                       if ( ! (isascii(c) &&
-                           (isgraph(c) || isblank(c)))) {
-                               mandoc_vmsg(MANDOCERR_CHAR_BAD, curp,
-                                   curp->line, pos, "0x%x", c);
-                               i += 2;
-                               ln.buf[pos++] = '?';
-                               continue;
-                       }
-
-                       /* Some other escape sequence, copy & cont. */
-
-                       ln.buf[pos++] = blk.buf[i++];

                        ln.buf[pos++] = blk.buf[i++];
                }
 
                        ln.buf[pos++] = blk.buf[i++];
                }
 

-               if (pos >= ln.sz)
+               if (pos + 1 >= ln.sz)

                        resize_buf(&ln, 256);
 
                        resize_buf(&ln, 256);
 

+               if (i == blk.sz || blk.buf[i] == '\0')
+                       ln.buf[pos++] = '\n';

                ln.buf[pos] = '\0';
 
                /*
                ln.buf[pos] = '\0';
 
                /*


@@ -506,13 +462,16 @@ rerun:
 
                switch (rr) {
                case ROFF_REPARSE:
 
                switch (rr) {
                case ROFF_REPARSE:

-                       if (REPARSE_LIMIT >= ++curp->reparse_count)
-                               mparse_buf_r(curp, ln, of, 0);
-                       else
+                       if (++curp->reparse_count > REPARSE_LIMIT)

                                mandoc_msg(MANDOCERR_ROFFLOOP, curp,
                                    curp->line, pos, NULL);
                                mandoc_msg(MANDOCERR_ROFFLOOP, curp,
                                    curp->line, pos, NULL);

-                       pos = 0;
-                       continue;
+                       else if (mparse_buf_r(curp, ln, of, 0) == 1 ||
+                           start == 1) {
+                               pos = 0;
+                               continue;
+                       }
+                       free(ln.buf);
+                       return 0;

                case ROFF_APPEND:
                        pos = strlen(ln.buf);
                        continue;
                case ROFF_APPEND:
                        pos = strlen(ln.buf);
                        continue;


@@ -526,7 +485,7 @@ rerun:
                            (i >= blk.sz || blk.buf[i] == '\0')) {
                                curp->sodest = mandoc_strdup(ln.buf + of);
                                free(ln.buf);
                            (i >= blk.sz || blk.buf[i] == '\0')) {
                                curp->sodest = mandoc_strdup(ln.buf + of);
                                free(ln.buf);

-                               return;
+                               return 1;

                        }
                        /*
                         * We remove `so' clauses from our lookaside
                        }
                        /*
                         * We remove `so' clauses from our lookaside


@@ -536,9 +495,9 @@ rerun:
                        if (curp->secondary)
                                curp->secondary->sz -= pos + 1;
                        save_file = curp->file;
                        if (curp->secondary)
                                curp->secondary->sz -= pos + 1;
                        save_file = curp->file;

-                       if (mparse_open(curp, &fd, ln.buf + of) ==
-                           MANDOCLEVEL_OK) {
+                       if ((fd = mparse_open(curp, ln.buf + of)) != -1) {

                                mparse_readfd(curp, fd, ln.buf + of);
                                mparse_readfd(curp, fd, ln.buf + of);

+                               close(fd);

                                curp->file = save_file;
                        } else {
                                curp->file = save_file;
                                curp->file = save_file;
                        } else {
                                curp->file = save_file;


@@ -559,15 +518,7 @@ rerun:
                        break;
                }
 
                        break;
                }
 

-               /*
-                * If input parsers have not been allocated, do so now.
-                * We keep these instanced between parsers, but set them
-                * locally per parse routine since we can use different
-                * parsers with each one.
-                */
-
-               if (curp->man == NULL ||
-                   curp->man->macroset == MACROSET_NONE)
+               if (curp->man->macroset == MACROSET_NONE)

                        choose_parser(curp);
 
                /*
                        choose_parser(curp);
 
                /*


@@ -600,19 +551,18 @@ rerun:
        }
 
        free(ln.buf);
        }
 
        free(ln.buf);

+       return 1;

 }
 
 static int
 read_whole_file(struct mparse *curp, const char *file, int fd,
                struct buf *fb, int *with_mmap)
 {
 }
 
 static int
 read_whole_file(struct mparse *curp, const char *file, int fd,
                struct buf *fb, int *with_mmap)
 {

+       struct stat      st;

        gzFile           gz;
        size_t           off;
        ssize_t          ssz;
 
        gzFile           gz;
        size_t           off;
        ssize_t          ssz;
 

-#if HAVE_MMAP
-       struct stat      st;
-

        if (fstat(fd, &st) == -1)
                err((int)MANDOCLEVEL_SYSERR, "%s", file);
 
        if (fstat(fd, &st) == -1)
                err((int)MANDOCLEVEL_SYSERR, "%s", file);
 


@@ -634,7 +584,6 @@ read_whole_file(struct mparse *curp, const char *file, int fd,
                if (fb->buf != MAP_FAILED)
                        return 1;
        }
                if (fb->buf != MAP_FAILED)
                        return 1;
        }

-#endif

 
        if (curp->gzip) {
                if ((gz = gzdopen(fd, "rb")) == NULL)
 
        if (curp->gzip) {
                if ((gz = gzdopen(fd, "rb")) == NULL)


@@ -680,10 +629,6 @@ read_whole_file(struct mparse *curp, const char *file, int fd,
 static void
 mparse_end(struct mparse *curp)
 {
 static void
 mparse_end(struct mparse *curp)
 {

-
-       if (curp->man == NULL && curp->sodest == NULL)
-               curp->man = roff_man_alloc(curp->roff, curp, curp->defos,
-                   curp->options & MPARSE_QUICK ? 1 : 0);

        if (curp->man->macroset == MACROSET_NONE)
                curp->man->macroset = MACROSET_MAN;
        if (curp->man->macroset == MACROSET_MDOC)
        if (curp->man->macroset == MACROSET_NONE)
                curp->man->macroset = MACROSET_MAN;
        if (curp->man->macroset == MACROSET_MDOC)


@@ -763,24 +708,19 @@ mparse_readfd(struct mparse *curp, int fd, const char *file)
                    (MPARSE_UTF8 | MPARSE_LATIN1);
                mparse_parse_buffer(curp, blk, file);
                curp->filenc = save_filenc;
                    (MPARSE_UTF8 | MPARSE_LATIN1);
                mparse_parse_buffer(curp, blk, file);
                curp->filenc = save_filenc;

-#if HAVE_MMAP

                if (with_mmap)
                        munmap(blk.buf, blk.sz);
                else
                if (with_mmap)
                        munmap(blk.buf, blk.sz);
                else

-#endif

                        free(blk.buf);
        }
                        free(blk.buf);
        }

-
-       if (fd != STDIN_FILENO && close(fd) == -1)
-               perror(file);
-

        return curp->file_status;
 }
 
        return curp->file_status;
 }
 

-enum mandoclevel
-mparse_open(struct mparse *curp, int *fd, const char *file)
+int
+mparse_open(struct mparse *curp, const char *file)

 {
        char             *cp;
 {
        char             *cp;

+       int               fd;

 
        curp->file = file;
        cp = strrchr(file, '.');
 
        curp->file = file;
        cp = strrchr(file, '.');


@@ -788,8 +728,8 @@ mparse_open(struct mparse *curp, int *fd, const char *file)
 
        /* First try to use the filename as it is. */
 
 
        /* First try to use the filename as it is. */
 

-       if ((*fd = open(file, O_RDONLY)) != -1)
-               return MANDOCLEVEL_OK;
+       if ((fd = open(file, O_RDONLY)) != -1)
+               return fd;

 
        /*
         * If that doesn't work and the filename doesn't
 
        /*
         * If that doesn't work and the filename doesn't


@@ -798,18 +738,18 @@ mparse_open(struct mparse *curp, int *fd, const char *file)
 
        if ( ! curp->gzip) {
                mandoc_asprintf(&cp, "%s.gz", file);
 
        if ( ! curp->gzip) {
                mandoc_asprintf(&cp, "%s.gz", file);

-               *fd = open(file, O_RDONLY);
+               fd = open(cp, O_RDONLY);

                free(cp);
                free(cp);

-               if (*fd != -1) {
+               if (fd != -1) {

                        curp->gzip = 1;
                        curp->gzip = 1;

-                       return MANDOCLEVEL_OK;
+                       return fd;

                }
        }
 
        /* Neither worked, give up. */
 
        mandoc_msg(MANDOCERR_FILE, curp, 0, 0, strerror(errno));
                }
        }
 
        /* Neither worked, give up. */
 
        mandoc_msg(MANDOCERR_FILE, curp, 0, 0, strerror(errno));

-       return MANDOCLEVEL_ERROR;
+       return -1;

 }
 
 struct mparse *
 }
 
 struct mparse *


@@ -829,11 +769,13 @@ mparse_alloc(int options, enum mandoclevel wlevel, mandocmsg mmsg,
        curp->man = roff_man_alloc( curp->roff, curp, curp->defos,
                curp->options & MPARSE_QUICK ? 1 : 0);
        if (curp->options & MPARSE_MDOC) {
        curp->man = roff_man_alloc( curp->roff, curp, curp->defos,
                curp->options & MPARSE_QUICK ? 1 : 0);
        if (curp->options & MPARSE_MDOC) {

-               mdoc_hash_init();

                curp->man->macroset = MACROSET_MDOC;
                curp->man->macroset = MACROSET_MDOC;

+               if (curp->man->mdocmac == NULL)
+                       curp->man->mdocmac = roffhash_alloc(MDOC_Dd, MDOC_MAX);

        } else if (curp->options & MPARSE_MAN) {
        } else if (curp->options & MPARSE_MAN) {

-               man_hash_init();

                curp->man->macroset = MACROSET_MAN;
                curp->man->macroset = MACROSET_MAN;

+               if (curp->man->manmac == NULL)
+                       curp->man->manmac = roffhash_alloc(MAN_TH, MAN_MAX);

        }
        curp->man->first->tok = TOKEN_NONE;
        return curp;
        }
        curp->man->first->tok = TOKEN_NONE;
        return curp;


@@ -842,27 +784,27 @@ mparse_alloc(int options, enum mandoclevel wlevel, mandocmsg mmsg,
 void
 mparse_reset(struct mparse *curp)
 {
 void
 mparse_reset(struct mparse *curp)
 {

-

        roff_reset(curp->roff);
        roff_reset(curp->roff);

+       roff_man_reset(curp->man);
+
+       free(curp->sodest);
+       curp->sodest = NULL;

 
 

-       if (curp->man != NULL)
-               roff_man_reset(curp->man);

        if (curp->secondary)
                curp->secondary->sz = 0;
 
        curp->file_status = MANDOCLEVEL_OK;
        if (curp->secondary)
                curp->secondary->sz = 0;
 
        curp->file_status = MANDOCLEVEL_OK;

-
-       free(curp->sodest);
-       curp->sodest = NULL;
+       curp->gzip = 0;

 }
 
 void
 mparse_free(struct mparse *curp)
 {
 
 }
 
 void
 mparse_free(struct mparse *curp)
 {
 

+       roffhash_free(curp->man->mdocmac);
+       roffhash_free(curp->man->manmac);

        roff_man_free(curp->man);
        roff_man_free(curp->man);

-       if (curp->roff)
-               roff_free(curp->roff);
+       roff_free(curp->roff);

        if (curp->secondary)
                free(curp->secondary->buf);
 
        if (curp->secondary)
                free(curp->secondary->buf);
 


@@ -884,6 +826,13 @@ mparse_result(struct mparse *curp, struct roff_man **man,
                *man = curp->man;
 }
 
                *man = curp->man;
 }
 

+void
+mparse_updaterc(struct mparse *curp, enum mandoclevel *rc)
+{
+       if (curp->file_status > *rc)
+               *rc = curp->file_status;
+}
+

 void
 mandoc_vmsg(enum mandocerr t, struct mparse *m,
                int ln, int pos, const char *fmt, ...)
 void
 mandoc_vmsg(enum mandocerr t, struct mparse *m,
                int ln, int pos, const char *fmt, ...)