wdvi

font-open.c (38928B)

---

 /*========================================================================*\
 
 Copyright (c) 1990-2013  Paul Vojta
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to
 deal in the Software without restriction, including without limitation the
 rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 sell copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 IN NO EVENT SHALL PAUL VOJTA OR ANY OTHER AUTHOR OF OR CONTRIBUTOR TO
 THIS SOFTWARE BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 IN THE SOFTWARE.
 
 NOTE:
 	xdvi is based on prior work, as noted in the modification history
 	in xdvi.c.
 
 \*========================================================================*/
 
 #include <err.h>
 #include <errno.h>
 #include <stdlib.h>	/* free(), atoi() */
 
 #include "events.h"	/* ev_flags */
 #include "font.h"	/* struct avl_t1 */
 #include "filf-app.h"	/* application-related defs, etc. */
 #include "filefind.h"
 #include "font-open.h"
 #include "util.h"	/* xmalloc(), xmemdup(), avladd(), ... */
 
 
 /*
  *	If you think you have to change DEFAULT_TAIL, then you haven't read the
  *	documentation closely enough.
  */
 
 #define	PATH_SEP	':'
 #define	DEFAULT_TAIL	"/%f.%d%p"
 #define	DEFAULT_VF_TAIL	"/%f.vf"
 
 #define DEFAULT_FONT_PATH	".:%S"	/* font searching */
 #define DEFAULT_VF_PATH		".:%S"	/* virtual-font searching */
 #define DEFAULT_DVIPS_CF_PATH	".:%S"	/* dvips config file searching */
 #define DEFAULT_FONTMAP_PATH	".:%S"	/* dvips-style fontmap searching */
 #define DEFAULT_ENC_PATH	".:%S"	/* encoding file searching */
 #define DEFAULT_TYPE1_PATH	".:%S"	/* Type 1 font file searching */
 
 /*
  * gs -h | sed \
  *     -e '1,/Search path:/d' \
  *     -e '/For more information/,$d' \
  *     -e '/Initialization files are compiled/d' \
  *     -e 's/$/\/\/\//' \
  *     -e 's/^   //' \
  *   | tr '\n' '/'
  */
 #define DEFAULT_GS_LIB_PATH "/usr/local/share/ghostscript/9.07/Resource/Init:/usr/local/share/ghostscript/9.07/lib:/usr/local/share/ghostscript/9.07/Resource/Font:/usr/local/share/fonts/ghostscript"
 
 #ifndef DEFAULT_FONT_SIZES
 	/* default sizes for current dpi */
 #define	DEFAULT_FONT_SIZES	"m0:m0.5:m1:m2:m3:m4:m5"
 #endif
 
 /*
  *	Information on how to search for pk and gf files.
  */
 
 static	const	char	no_f_str_pkgf[]	= DEFAULT_TAIL;
 
 static	struct findrec			search_pkgf	= {
 	/* path1	*/	NULL,
 	/* path2	*/	DEFAULT_FONT_PATH,
 	/* type		*/	"font",
 	/* fF_etc	*/	"fFdbpm",
 	/* x_var_char	*/	'd',
 	/* n_var_opts	*/	3,
 	/* no_f_str	*/	no_f_str_pkgf,
 	/* no_f_str_end	*/	no_f_str_pkgf + sizeof(no_f_str_pkgf) - 1,
 	/* abs_str	*/	"%f.%d%p",
 	/* pct_s_str	*/	"%qfonts/%p/%m//:%qfonts/%p/modeless//",
 	{
 	  /* v.stephead		*/	NULL,
 	  /* v.pct_s_head	*/	NULL,
 	  /* v.pct_s_count	*/	0,
 	  /* v.pct_s_atom	*/	NULL,
 	  /* v.rootp		*/	NULL,
 	}
 };
 
 /*
  *	Information on how to search for vf files.
  */
 
 static	const	char	no_f_str_vf[]	= DEFAULT_VF_TAIL;
 
 static	struct findrec			search_vf	= {
 	/* path1	*/	NULL,
 	/* path2	*/	DEFAULT_VF_PATH,
 	/* type		*/	"vf",
 	/* fF_etc	*/	"fF",
 	/* x_var_char	*/	'f',		/* i.e., none */
 	/* n_var_opts	*/	2,
 	/* no_f_str	*/	no_f_str_vf,
 	/* no_f_str_end	*/	no_f_str_vf + sizeof(no_f_str_vf) - 1,
 	/* abs_str	*/	"%f.vf",
 	/* pct_s_str	*/	"%qfonts/vf//",
 	{
 	  /* v.stephead		*/	NULL,
 	  /* v.pct_s_head	*/	NULL,
 	  /* v.pct_s_count	*/	0,
 	  /* v.pct_s_atom	*/	NULL,
 	  /* v.rootp		*/	NULL,
 	}
 };
 
 static	int	*sizes, *sizend;
 static	char	default_size_list[]	= DEFAULT_FONT_SIZES;
 
 static	char		bdpi_string[10];
 static	char		dpi_string[10];
 
 static	double		magsteps[10]	= {1.0, 1.2, 1.44, 1.728, 2.0736,
 					   2.48832, 2.985984, 3.5831808,
 					   4.29981696, 5.159780352};
 
 
 /*
  *	Information on how to search for dvips configuration files.
  */
 
 static	const	char	no_f_str_dvips_cf[]	= "/%f";
 
 static	struct findrec			search_dvips_cf	= {
 	/* path1	*/	NULL,
 	/* path2	*/	DEFAULT_DVIPS_CF_PATH,
 	/* type		*/	"dvips config",
 	/* fF_etc	*/	"fF",
 	/* x_var_char	*/	'f',		/* i.e., none */
 	/* n_var_opts	*/	2,
 	/* no_f_str	*/	no_f_str_dvips_cf,
 	/* no_f_str_end	*/	no_f_str_dvips_cf + sizeof no_f_str_dvips_cf -1,
 	/* abs_str	*/	"%f",
 	/* pct_s_str	*/	"%qdvips//",
 	{
 	  /* v.stephead		*/	NULL,
 	  /* v.pct_s_head	*/	NULL,
 	  /* v.pct_s_count	*/	0,
 	  /* v.pct_s_atom	*/	NULL,
 	  /* v.rootp		*/	NULL,
 	}
 };
 
 /*
  *	Information on how to search for (dvips-style) map files.
  */
 
 static	const	char	no_f_str_fontmap[]	= "/%f";
 
 static	struct findrec			search_fontmap	= {
 	/* path1	*/	NULL,
 	/* path2	*/	DEFAULT_FONTMAP_PATH,
 	/* type		*/	"font map",
 	/* fF_etc	*/	"fF",
 	/* x_var_char	*/	'f',		/* i.e., none */
 	/* n_var_opts	*/	2,
 	/* no_f_str	*/	no_f_str_fontmap,
 	/* no_f_str_end	*/	no_f_str_fontmap + sizeof no_f_str_fontmap -1,
 	/* abs_str	*/	"%f",
 	/* pct_s_str	*/    "%qfonts/map/{xdvi,dvips,pdftex}//:%qfonts/map//",
 	{
 	  /* v.stephead		*/	NULL,
 	  /* v.pct_s_head	*/	NULL,
 	  /* v.pct_s_count	*/	0,
 	  /* v.pct_s_atom	*/	NULL,
 	  /* v.rootp		*/	NULL,
 	}
 };
 
 /*
  *	Information on how to search for font encoding files.
  */
 
 static	const	char	no_f_str_enc[]	= "/%f";
 
 static	struct findrec			search_enc	= {
 	/* path1	*/	no_f_str_enc,	/* flag value:  uninitialized */
 	/* path2	*/	DEFAULT_ENC_PATH,
 	/* type		*/	"font encoding",
 	/* fF_etc	*/	"fF",
 	/* x_var_char	*/	'f',		/* i.e., none */
 	/* n_var_opts	*/	2,
 	/* no_f_str	*/	no_f_str_enc,
 	/* no_f_str_end	*/	no_f_str_enc + sizeof no_f_str_enc -1,
 	/* abs_str	*/	"%f",
 	/* pct_s_str	*/	"%qfonts/enc//",
 	{
 	  /* v.stephead		*/	NULL,
 	  /* v.pct_s_head	*/	NULL,
 	  /* v.pct_s_count	*/	0,
 	  /* v.pct_s_atom	*/	NULL,
 	  /* v.rootp		*/	NULL,
 	}
 };
 
 /*
  *	Information on how to search for Type 1 fonts.
  */
 
 static	const	char	no_f_str_type1[]	= "/%f";
 
 static	struct findrec			search_type1	= {
 	/* path1	*/	no_f_str_type1,	/* flag value:  uninitialized */
 	/* path2	*/	DEFAULT_TYPE1_PATH,
 	/* type		*/	"Type 1 font",
 	/* fF_etc	*/	"fF",
 	/* x_var_char	*/	'f',
 	/* n_var_opts	*/	2,
 	/* no_f_str	*/	no_f_str_type1,
 	/* no_f_str_end	*/	no_f_str_type1 + sizeof(no_f_str_type1) - 1,
 	/* abs_str	*/	"%f",
 	/* pct_s_str	*/	"%qfonts/type1//",
 	{
 	  /* v.stephead		*/	NULL,
 	  /* v.pct_s_head	*/	NULL,
 	  /* v.pct_s_count	*/	0,
 	  /* v.pct_s_atom	*/	NULL,
 	  /* v.rootp		*/	NULL,
 	}
 };
 
 
 
 static	int
 atosize(p)
 	const	char	*p;
 {
 	const	char	*q;
 	Boolean		minus;
 	double		factor;
 
 	if (*p != 'm')
 	    return atoi(p);
 
 	for (q = "agstep";; ++q) {
 	    ++p;
 	    if (*q == '\0' || *p != *q) break;
 	}
 
 	minus = False;
 	if (*p == '-') {
 	    minus = True;
 	    ++p;
 	}
 
 	if (*p < '0' || *p > '9')
 	    return 0;
 	factor = magsteps[*p - '0'];
 	++p;
 
 	if (*p == '.' && p[1] == '5')
 	    factor *= 1.0954451150103321;	/* sqrt(1.2) */
 
 	return (int)
 	  ((minus ? pixels_per_inch / factor : pixels_per_inch * factor) + 0.5);
 }
 
 static	void
 get_sizes(size_list, spp)
 	char	*size_list;
 	int	**spp;
 {
 	if (*size_list == PATH_SEP) ++size_list;
 	for (;;) {
 	    *(*spp)++ = atosize(size_list);
 	    size_list = index(size_list, PATH_SEP);
 	    if (size_list == NULL) return;
 	    ++size_list;
 	}
 }
 
 
 
 /*
  *	The following code handles lookup of Type 1 fonts for use as FreeType
  *	fonts, and for use within MetaPost output.
  *	The system psfonts.map file is read into an AVL tree as needed (lazy
  *	evaluation), and searched for Type 1 fonts.
  */
 
 struct p_list {					/* list of map file names */
 	struct p_list	*next;
 	const char	*value;
 };
 
 	/* Initialize this list to "psfonts.map".  */
 
 static	struct p_list	psfonts_map		= {NULL, "psfonts.map"};
 
 static	struct p_list	*p_head			= &psfonts_map;
 static	struct p_list	**p_tail		= &psfonts_map.next;
 
 static	FILE		*mapfile		= NULL;
 
 static	Boolean
 fgets_long(f)
 	FILE	*f;
 {
 	int	len;
 
 	if (fgets(ffline, ffline_len, f) == NULL)
 	    return False;
 
 	len = 0;
 	for (;;) {
 	    len += strlen(ffline + len);
 	    if (len > 0 && ffline[len - 1] == '\n') {
 		ffline[--len] = '\0';
 		break;
 	    }
 	    if (len < ffline_len - 1)
 		break;
 	    expandline(len);
 	    fgets(ffline + len, ffline_len - len, f);
 	}
 
 	return True;
 }
 
 /*
  *	Get list of map files from dvips config file(s).
  */
 
 static	void
 getdefaults(f)
 	FILE	*f;
 {
 	char		*p, *q;
 	int		len;
 	struct p_list	*p_node;
 
 	while (fgets_long(f)) {
 	    p = ffline;
 	    while (*p == ' ' || *p == '\t') ++p;
 	    if (*p == 'p') {
 		do ++p;
 		while (*p == ' ' || *p == '\t');
 
 		if (*p == '+')
 		    do ++p;
 		    while (*p == ' ' || *p == '\t');
 		else {	/* discard old list */
 		    struct p_list *pl, *pl2;
 
 		    *p_tail = NULL;
 		    pl = p_head;
 		    if (pl == &psfonts_map) pl = pl->next;
 		    while (pl != NULL) {
 			free((char *) pl->value);
 			pl2 = pl->next;
 			free(pl);
 			pl = pl2;
 		    }
 		    p_tail = &p_head;
 		}
 
 		/* get white-delimited argument */
 		len = strlen(p);
 		q = memchr(p, ' ', len);
 		if (q != NULL) len = q - p;
 		q = memchr(p, '\t', len);
 		if (q != NULL) len = q - p;
 		p[len] = '\0';
 
 		p_node = xmalloc(sizeof *p_node);
 		p_node->value = xmemdup(p, len + 1);
 		*p_tail = p_node;
 		p_tail = &p_node->next;
 	    }
 	}
 
 	fclose(f);
 }
 
 
 /*
  *	Information about Type 1 fonts is stored in an AVL tree.
  */
 
 static	struct avl_t1	*t1_head	= NULL;
 
 
 /*
  *	Parse line from psfonts.map file.
  */
 
 static struct avl_t1 *
 dvips_parse(line)
 	const char	*line;
 {
 	const char	*w1p, *encp, *pfp, *qp;
 	size_t		w1l, encl, pfl, ql;
 	const char	*w2p;
 	size_t		w2l;
 	const char	*p, *p0;
 	const char	*err;
 	struct avl_t1	*t1p;
 	char		*q;
 
 	w2l = w1l = encl = pfl = ql = 0;
 	err = NULL;
 	p = line;
 	for (;;) {	/* loop over words */
 	    while (*p == ' ' || *p == '\t') ++p;
 	    if (*p == '\0')
 		break;
 
 	    if (*p == '"') {	/* quoted string */
 		const char *p_end;
 
 		p0 = p + 1;
 		p_end = p0 + strlen(p0);
 		p = memchr(p0, '"', p_end - p0);
 		if (p == NULL) p = p_end;
 		qp = (ql == 0 ? p0 : NULL);
 		ql += p - p0 + 1;
 		if (*p == '"') ++p;
 		continue;
 	    }
 
 	    if (*p == '<') {	/* encoding or pfa/b file */
 		int	wtype	= 0;
 
 		++p;
 		if (*p == '<') {
 		    wtype = 1;	/* font file */
 		    ++p;
 		}
 		else if (*p == '[') {
 		    wtype = -1;	/* encoding file */
 		    ++p;
 		}
 
 		/* find word */
 		while (*p == ' ' || *p == '\t') ++p;
 		p0 = p;
 		while (*p != '\0' && *p != ' ' && *p != '\t') ++p;
 
 		if (wtype == 0 && p > p0 + 4 && p[-4] == '.') {
 		    if (memcmp(p - 3, "enc", 3) == 0
 		      || memcmp(p - 3, "ENC", 3) == 0)
 			wtype = -1;
 		    else if (memcmp(p - 3, "pfa", 3) == 0
 		      || memcmp(p - 3, "pfb", 3) == 0
 		      || memcmp(p - 3, "PFA", 3) == 0
 		      || memcmp(p - 3, "PFB", 3) == 0)
 			wtype = 1;
 		}
 
 		if (wtype > 0) {
 		    if (pfl != 0)
 			err = "more than one font file given";
 		    else {
 			pfp = p0;
 			pfl = p - p0 + 1;
 		    }
 		}
 		else if (wtype < 0) {
 		    if (encl != 0)
 			err = "more than one encoding file given";
 		    else {
 			encp = p0;
 			encl = p - p0 + 1;
 		    }
 		}
 		else
 		    err = "cannot identify file type";
 	    }
 	    else {	/* if ordinary word */
 		p0 = p;
 		while (*p != '\0' && *p != ' ' && *p != '\t') ++p;
 		if (w1l == 0) {
 		    w1p = p0;
 		    w1l = p - p0;
 		}
 		else if (w2l == 0) {
 		    w2p = p0;
 		    w2l = p - p0;
 		}
 		else
 		    err = "more than two non-download words given";
 	    }
 	}	/* end loop over words */
 
 	if (w1l == 0) {
 	    if (debug & DBG_OPEN)
 		warnx("map file '%s': line '%s' does not give a font name.",
 		  p_head->value, line);
 	    return NULL;
 	}
 
 	if (err != NULL) {
 	    if (debug & DBG_OPEN)
 		warnx("map file '%s', font '%.*s': '%s'", p_head->value,
 		    (int) w1l, w1p, err);
 	    return NULL;
 	}
 
 	t1p = (struct avl_t1 *) avladd(w1p, w1l, (struct avl **) &t1_head,
 	  sizeof(struct avl_t1));
 
 	if (t1p->key != w1p) {	/* if existing record */
 	    if (debug & DBG_OPEN)
 		warnx("map file '%s', font '%.*s': duplicate record; using first one",
 		  p_head->value, (int) w1l, w1p);
 	    return NULL;
 	}
 
 	t1p->key = q = xmalloc(w1l + w2l + 1 + pfl + encl + ql);
 
 	memcpy(q, w1p, w1l);
 	q += w1l;
 	t1p->psname = t1p->key;
 	if (w2l != 0) {
 	    t1p->psname = q;
 	    memcpy(q, w2p, w2l);
 	    q += w2l;
 	}
 	*q++ = '\0';
 
 	t1p->fontfile = NULL;
 	if (pfl != 0) {
 	    t1p->fontfile = q;
 	    memcpy(q, pfp, pfl - 1);
 	    q += pfl;
 	    q[-1] = '\0';
 	}
 
 	t1p->encname = t1p->addinfo = NULL;
 	t1p->bad = False;
 	t1p->ft = NULL;
 
 	if (encl != 0) {
 	    t1p->encname = q;
 	    memcpy(q, encp, encl - 1);
 	    q += encl;
 	    q[-1] = '\0';
 	}
 
 	if (ql != 0) {
 	    t1p->addinfo = q;
 	    if (qp != 0) {
 		memcpy(q, qp, ql - 1);
 		q += ql;
 	    }
 	    else {	/* multiple quoted strings; rescan to get them */
 		const char	*p_end;
 
 		p = line;
 		p_end = p + strlen(p);
 		for (;;) {
 		    while (*p == ' ' || *p == '\t') ++p;
 		    if (*p == '\0')
 			break;
 
 		    /* found a word */
 		    if (*p == '"') {
 			++p;
 			p0 = p;
 			p = memchr(p0, '"', p_end - p0);
 			if (p == NULL) p = p_end;
 			memcpy(q, p0, p - p0);
 			q += p - p0;
 			*q++ = ' ';
 			if (*p == '\0') break;
 			++p;
 		    }
 		    else	/* skip unquoted word */
 			while (*p != '\0' && *p != ' ' && *p != '\t') ++p;
 		}
 	    }
 	    q[-1] = '\0';
 	}
 
 	return t1p;
 }
 
 /*
  *	Information on the Ghostscript font aliasing mechanism is kept in
  *	another AVL tree.  Each identifier points to a list of strings,
  *	up to one from each Fontmap file.  Within a Fontmap file, later entries
  *	for a given string override earlier ones.
  */
 
 struct avl_gs {		/* structure for gs font information */
 	AVL_COMMON;
 	short		fontmap_number;	/* sequence of most recent entry */
 	Boolean		in_use;
 	struct gs_list	*list;
 };
 
 struct gs_list {	/* list of Fontmap entries for this font name */
 	struct gs_list	*next;
 	const char	value[0];
 };
 
 static	struct avl_gs	*gs_head	= NULL;
 
 typedef	void	(*gs_path_proc)(FILE *);
 
 static	const char	*env_gs_lib;
 
 static FILE *
 gs_try_fopen(str, len, name)
 	const char	*str;
 	unsigned int	len;
 	const char	*name;
 {
 	unsigned int	namelen	= strlen(name) + 1;
 	FILE		*f;
 
 	if (len + namelen + 1 > ffline_len) expandline(len + namelen + 1);
 	memcpy(ffline, str, len);
 	ffline[len] = '/';
 	memcpy(ffline + len + 1, name, namelen);
 
 	f = xfopen(ffline, "r");
 
 	if (debug & DBG_OPEN)
 	    printf("gs_try_fopen: %s: %s\n", ffline,
 	      f != NULL ? "file opened" : strerror(errno));
 
 	return f;
 }
 
 static FILE *
 gs_path_fopen(name, proc)
 	const char	*name;
 	gs_path_proc	proc;
 {
 	const	char	*str1	= env_gs_lib;
 	const	char	*str2	= DEFAULT_GS_LIB_PATH;
 	const	char	*str1_end, *str2_end;
 	const char	*p1, *p2;
 	FILE		*f;
 
 	if (str1 == NULL) {
 	    str1 = str2;
 	    str2 = NULL;
 	}
 
 	str1_end = str1 + strlen(str1);
 
 	for (;;) {
 	    p1 = memchr(str1, ':', str1_end - str1);
 	    if (p1 == NULL) p1 = str1_end;
 	    if (p1 == str1) {
 		if (str2 != NULL) {
 		    str2_end = str2 + strlen(str2);
 		    for (;;) {
 			p2 = memchr(str2, ':', str2_end - str2);
 			if (p2 == NULL) p2 = str2_end;
 			if (p2 > str2) {
 			    f = gs_try_fopen(str2, p2 - str2, name);
 			    if (f != NULL) {
 				if (proc != NULL)
 				    proc(f);
 				else
 				    return f;
 			    }
 			}
 			if (*p2 == '\0')
 			    break;
 			str2 = p2 + 1;
 		    }
 		    str2 = NULL;
 		}
 	    }
 	    else {
 		f = gs_try_fopen(str1, p1 - str1, name);
 		if (f != NULL) {
 		    if (proc != NULL)
 			proc(f);
 		    else
 			return f;
 		}
 	    }
 
 	    if (*p1 == '\0')
 		break;
 	    str1 = p1 + 1;
 	}
 
 	return NULL;
 }
 
 
 static FILE *
 lookup_gs_font(font, path_ret)
 	const char	*font;
 	const char	**path_ret;
 {
 	struct avl_gs	*gsfp;
 	int		font_len;
 	int		i;
 
 	font_len = strlen(font);
 	gsfp = gs_head;
 	for (;;) {
 	    if (gsfp == NULL)		/* if not found */
 		return NULL;
 
 	    i = font_len - gsfp->key_len;
 	    if (i == 0)
 		i = memcmp(font, gsfp->key, font_len);
 	    if (i == 0) {		/* if found */
 		struct gs_list	*gl, *gl2, *gl3;
 		FILE		*f;
 
 		if (gsfp->in_use) {
 		    if (debug & DBG_OPEN)
 			printf("Alias loop for %s detected; ignoring.\n", font);
 		    return NULL;
 		}
 
 		/* If we haven't done it yet, reverse the linked list */
 		if (gsfp->fontmap_number != 0) {
 		    gsfp->fontmap_number = 0;
 		    gl = gsfp->list;
 		    gl2 = NULL;
 		    while (gl != NULL) {
 			gl3 = gl->next;
 			gl->next = gl2;
 			gl2 = gl;
 			gl = gl3;
 		    }
 		    gsfp->list = gl2;
 		}
 		gsfp->in_use = True;
 		f = NULL;
 		for (gl = gsfp->list; gl != NULL; gl = gl->next) {
 		    if (gl->value[0] == '\0') {	/* if alias */
 			if (debug & DBG_OPEN)
 			    printf("Found alias %s --> %s\n", font,
 			      gl->value + 1);
 			f = lookup_gs_font(gl->value + 1, path_ret);
 			if (debug & DBG_OPEN)
 			    if (f == NULL)
 				printf("Alias %s not found.\n", gl->value + 1);
 			if (f != NULL) break;
 		    }
 		    else {
 			if (debug & DBG_OPEN)
 			    printf("Checking file %s\n", gl->value);
 			if (gl->value[0] == '/' || (gl->value[0] == '.'
 			  && (gl->value[1] == '/' || (gl->value[1] == '.'
 			  && gl->value[2] == '/')))) {
 			    f = xfopen(gl->value, "r");
 			    if (f != NULL) {
 				*path_ret = xstrdup(gl->value);
 				break;
 			    }
 			}
 			else {
 			    f = gs_path_fopen(gl->value, NULL);
 			    if (f != NULL) {
 				*path_ret = xstrdup(ffline);
 				break;
 			    }
 			}
 		    }
 		}
 		gsfp->in_use = False;
 		return f;
 	    }
 	    gsfp = (struct avl_gs *) (i < 0 ? gsfp->left : gsfp->right);
 	}
 }
 
 
 #define	GS_BUF_SIZE	4096
 
 struct gsfile {
 	FILE			*f;
 	unsigned char		*buffer;
 	const unsigned char	*bufpos;
 	const unsigned char	*buf_end;
 };
 
 static Boolean
 gs_fillbuf(gsf)
 	struct gsfile	*gsf;
 {
 	unsigned char	*p;
 	unsigned int	len;
 
 	if (gsf->buf_end < gsf->buffer + GS_BUF_SIZE)
 	    return False;
 
 	gsf->bufpos = p = gsf->buffer;
 	for (;;) {
 	    len = gsf->buf_end - p;
 	    if (len <= 0) break;
 	    len = fread(p, 1, len, gsf->f);
 	    if (len <= 0) break;
 	    p += len;
 	}
 	gsf->buf_end = p;
 	return (p > gsf->buffer);
 }
 
 static	unsigned char	gs_ctype[256];
 
 #define	GS_EOF	'\0'
 #define	GS_ERR	'%'
 #define	LPAREN	'('
 #define	RPAREN	')'
 
 static void
 init_gs_ctype()
 {
 	const char	*p;
 
 	for (p = " \t\f\n\r";; ++p) {
 	    gs_ctype[(unsigned char) *p] = 1;	/* white space */
 	    if (*p == '\0') break;
 	}
 	gs_ctype['/'] = 2;		/* literal token */
 	gs_ctype['('] = 3;		/* string */
 	for (p = ")<>[]{}%"; *p != '\0'; ++p)
 	    gs_ctype[(unsigned char) *p] = 4;	/* delimiter */
 }
 
 static unsigned char
 get_gs_character(gsfp)
 	struct gsfile	*gsfp;
 {
 	unsigned char		c;
 
 	for (;;) {
 	    if (gsfp->bufpos >= gsfp->buf_end && !gs_fillbuf(gsfp))
 		return '%';
 	    c = *gsfp->bufpos++;
 
 	    /* Check for comments */
 	    if (c == '%') {
 		for (;;) {
 		    const unsigned char *p1, *p2;
 
 		    p1 = memchr(gsfp->bufpos, '\n',
 		      gsfp->buf_end - gsfp->bufpos);
 		    if (p1 == NULL) p1 = gsfp->buf_end;
 		    p2 = memchr(gsfp->bufpos, '\r', p1 - gsfp->bufpos);
 		    if (p2 != NULL) p1 = p2;
 		    p2 = memchr(gsfp->bufpos, '\f', p1 - gsfp->bufpos);
 		    if (p2 != NULL) p1 = p2;
 		    if (p1 < gsfp->buf_end) {
 			gsfp->bufpos = p1 + 1;
 			break;
 		    }
 		    if (!gs_fillbuf(gsfp))
 			return '%';
 		}
 		continue;
 	    }
 
 	    if (gs_ctype[c] != 1)
 		break;
 	}
 
 	return c;
 }
 
 static unsigned char
 get_gs_token(gsfp, pos, pos_ret, file_type)
 	struct gsfile	*gsfp;
 	unsigned int	pos;
 	unsigned int	*pos_ret;
 	const char	*file_type;
 {
 	unsigned char		gs_t_type;
 	unsigned char		c;
 	const unsigned char	*p0;
 	unsigned int		pos0;
 	unsigned int		depth;
 
 	gs_t_type = c = get_gs_character(gsfp);
 	if (c == '%')
 	    return GS_EOF;
 
 	p0 = gsfp->bufpos;
 	switch (gs_ctype[c]) {
 	    case 0:	/* most characters */
 	    case 2:	/* '/' */
 		--p0;	/* retain initial character */
 		pos0 = pos;
 		for (;;) {
 		    if (gsfp->bufpos >= gsfp->buf_end) {
 			unsigned int	len	= gsfp->bufpos - p0;
 
 			if (pos + len >= ffline_len) expandline(pos + len);
 			bcopy(p0, ffline + pos, len);
 			pos += len;
 			if (!gs_fillbuf(gsfp))
 			    break;
 			p0 = gsfp->buffer;
 		    }
 		    if (gs_ctype[*gsfp->bufpos] != 0) {
 			unsigned int	len	= gsfp->bufpos - p0;
 
 			if (pos + len >= ffline_len) expandline(pos + len);
 			bcopy(p0, ffline + pos, len);
 			pos += len;
 			break;
 		    }
 		    ++gsfp->bufpos;
 		}
 		/* Filter out DOS ^Z */
 		if (pos == pos0 + 1 && ffline[pos0] == '\032')
 		    return GS_EOF;
 		break;
 
 	    case 3:	/* left parenthesis */
 		depth = 1;
 		for (;;) {
 		    const unsigned char *p1, *p2, *p3;
 
 		    if (gsfp->bufpos >= gsfp->buf_end) {
 			unsigned int	len	= gsfp->bufpos - p0;
 
 			if (pos + len >= ffline_len) expandline(pos + len);
 			bcopy(p0, ffline + pos, len);
 			pos += len;
 			if (!gs_fillbuf(gsfp)) {
 			    warnx("unterminated string in '%s' file; giving up." ,
 			      file_type);
 			    return GS_ERR;
 			}
 			p0 = gsfp->buffer;
 		    }
 		    p1 = memchr(gsfp->bufpos, RPAREN,
 		      gsfp->buf_end - gsfp->bufpos);
 		    if (p1 == NULL) p1 = gsfp->buf_end;
 		    for (;;) {
 			p2 = memchr(gsfp->bufpos, LPAREN, p1 - gsfp->bufpos);
 			if (p2 == NULL) p2 = p1;
 			p3 = p2;
 			for (;;) {
 			    if (p3 <= gsfp->bufpos) {
 				if (c == '\\') --p3;
 				break;
 			    }
 			    if (p3[-1] != '\\') break;
 			    --p3;
 			}
 			c = '\\' - 1 + ((p2 - p3) & 1);
 			if (p2 >= p1)
 			    break;
 			if (c != '\\')
 			    ++depth;
 			gsfp->bufpos = p2 + 1;
 			c = '\0';
 		    }
 		    if (p1 < gsfp->buf_end) {	/* if left parenthesis at p1 */
 			if (c != '\\') {
 			    if (--depth == 0) {
 				unsigned int	len	= p1 - p0;
 
 				if (pos + len >= ffline_len)
 				    expandline(pos + len);
 				bcopy(p0, ffline + pos, len);
 				pos += len;
 				gsfp->bufpos = p1 + 1;
 				break;
 			    }
 			}
 			++p1;
 		    }
 		    gsfp->bufpos = p1;
 		}
 		/* We could do backslash escaping here, but it's probably
 		   unnecessary.  */
 		break;
 
 	    default:
 		warnx("invalid character `%c' encountered in '%s' file; giving up.",
 		  c, file_type);
 		return GS_ERR;
 	}
 
 	*pos_ret = pos;
 	return gs_t_type;
 }
 
 
 static	short		gs_fontmap_number	= 0;
 
 static void
 process_gs_fontmap(FILE *f)
 {
 	struct gsfile	gsf;
 	unsigned char	buffer[GS_BUF_SIZE];
 	unsigned char	ttype;
 	unsigned int	pos1, pos2, pos3;
 
 	++gs_fontmap_number;
 
 	gsf.f = f;
 	gsf.buffer = buffer;
 	gsf.bufpos = gsf.buf_end = buffer + GS_BUF_SIZE;
 
 	/*
 	 * Allow entries of the following types:
 	 *
 	 *	(string) .runlibfile
 	 *	/identifier (string) ;
 	 *	/identifier /alias ;
 	 */
 
 	for (;;) {
 	    ttype = get_gs_token(&gsf, 0, &pos1, "Fontmap");
 	    if (ttype == GS_EOF || ttype == GS_ERR)
 		break;
 	    if (ttype == LPAREN) {
 		FILE	*f1;
 
 		ttype = get_gs_token(&gsf, pos1, &pos2, "Fontmap");
 		if (ttype == GS_ERR)
 		    break;
 		if (ttype == GS_EOF) {
 		    warnx("unexpected end of Fontmap file; giving up.");
 		    break;
 		}
 		if (ttype != '.' || pos2 - pos1 != 11
 		  || memcmp(ffline + pos1, ".runlibfile", 11) != 0) {
 		    warnx("invalid token following '(%.*s)' in Fontmap file; giving up.",
 		      (int) pos1, ffline);
 		    break;
 		}
 
 		ffline[pos1] = '\0';
 		if (ffline[0] == '/' || (ffline[0] == '.' && (ffline[1] == '/'
 		  || (ffline[1] == '.' && ffline[2] == '/'))))
 		    f1 = xfopen(ffline, "r");
 		else {
 		    char *q;
 
 		    q = xmemdup(ffline, pos1 + 1);
 		    f1 = gs_path_fopen(q, NULL);
 		    free(q);
 		}
 
 		if (f1 == NULL)
 		    warn("Fontmap .runlibfile: '%s'", ffline);
 		else {
 		    --gs_fontmap_number;
 		    process_gs_fontmap(f1);
 		}
 	    }
 	    else if (ttype == '/') {
 		struct avl_gs	*gsfp;
 		struct gs_list	*gslp;
 
 		ttype = get_gs_token(&gsf, pos1, &pos2, "Fontmap");
 		if (ttype == GS_ERR)
 		    break;
 		if (ttype == GS_EOF) {
 		    warnx("unexpected end of Fontmap file; giving up.");
 		    break;
 		}
 		if ((ttype != '/' && ttype != LPAREN)
 		  || pos2 == pos1	/* empty string would mess things up */
 		  || get_gs_token(&gsf, pos2, &pos3, "Fontmap") != ';'
 		  || pos3 != pos2 + 1) {
 		    warnx("invalid token following '%.*s' in Fontmap file; giving up.",
 		      (int) pos1, ffline);
 		    break;
 		}
 		if (ttype == '/')
 		    ffline[pos1] = '\0';	/* mark aliases by initial \0 */
 		ffline[pos2++] = '\0';		/* terminate string */
 
 		/* Add to database */
 		gsfp = (struct avl_gs *) avladd(ffline + 1, pos1 - 1,
 		  (struct avl **) &gs_head, sizeof *gsfp);
 
 		if (gsfp->key == ffline + 1) {	/* if new record */
 		    gsfp->key = xmemdup(ffline + 1, pos1 - 1);
 		    gsfp->in_use = False;
 		    gsfp->list = NULL;
 		}
 		else {
 		    if (strlen(gsfp->list->value + 1) + 2 == pos2 - pos1
 		      && memcmp(gsfp->list->value, ffline + pos1, pos2 - pos1)
 		      == 0)
 			continue;	/* ignore duplicate entry */
 		    if (gsfp->fontmap_number == gs_fontmap_number) {
 			/* Later entries in a Fontmap file override earlier
 			   ones */
 			gslp = gsfp->list;
 			gsfp->list = gslp->next;
 			free(gslp);
 		    }
 		}
 		gslp = xmalloc(sizeof *gslp + pos2 - pos1);
 		gslp->next = gsfp->list;
 		gsfp->list = gslp;
 		memcpy((char *) gslp->value, ffline + pos1, pos2 - pos1);
 
 		gsfp->fontmap_number = gs_fontmap_number;
 	    }
 	    else {
 		warnx("invalid token '%s' in Fontmap file; giving up.",
 		  ffline);
 	    }
 	}
 
 	fclose(f);
 }
 
 /*
  *	Read Ghostscript Fontmap files.  These are used if the line in
  *	psfonts.map does not contain a filename for the font.
  *
  *	For example:
  *		n019003l NimbusSanL-Regu
  */
 
 static void
 read_gs_fontmaps()
 {
 	env_gs_lib = getenv("XDVI_GS_LIB");
 	if (env_gs_lib == NULL)
 	    env_gs_lib = getenv("GS_LIB");
 
 	if (gs_ctype[0] == 0)
 	    init_gs_ctype();
 
 	(void) gs_path_fopen("Fontmap", process_gs_fontmap);
 }
 
 
 /*
  *	pre_lookup_t1_font - Find a Type 1 font (or return NULL).
  */
 
 static struct avl_t1 *
 pre_lookup_t1_font(fontname)
 	const char	*fontname;
 {
 	struct avl_t1	*t1p;
 	size_t		len;
 	int		i;
 
 	/* first, search for the font */
 
 	len = strlen(fontname);
 	t1p = t1_head;
 	while (t1p != NULL) {
 	    i = len - t1p->key_len;
 	    if (i == 0)
 		i = memcmp(fontname, t1p->key, len);
 	    if (i == 0)
 		return t1p;	/* found it */
 	    t1p = (struct avl_t1 *) (i < 0 ? t1p->left : t1p->right);
 	}
 
 	/* next, read in more records in hopes of finding the font */
 
 	if (p_head != NULL)
 	    for (;;) {
 		if (!fgets_long(mapfile)) {	/* if end of file */
 		    fclose(mapfile);
 		    for (;;) {
 			p_head = p_head->next;
 			if (p_head == NULL)
 			    return NULL;
 			mapfile = filefind(p_head->value, &search_fontmap,
 			  NULL);
 			if (mapfile != NULL) {
 			    if (debug & DBG_OPEN)
 				printf("Map file: %s\n", p_head->value);
 			    break;
 			}
 			warnx("cannot open map file '%s'", p_head->value);
 		    }
 		    continue;
 		}
 
 		if (*ffline < ' ' || *ffline == '*' || *ffline == '#'
 		  || *ffline == ';' || *ffline == '%')
 		    continue;
 
 		t1p = dvips_parse(ffline);
 
 		if (t1p != NULL && t1p->key_len == len
 		  && memcmp(t1p->key, fontname, len) == 0)
 		    return t1p;	/* found it */
 	    }
 
 	return NULL;
 }
 
 /*
  *	lookup_t1_font - Find a Type 1 font (or return NULL).
  */
 
 
 static struct avl_t1 *
 lookup_t1_font(fontp)
 	struct font	*fontp;
 {
 	struct avl_t1	*t1p;
 	struct ftfont	*ftp;
 
 	t1p = pre_lookup_t1_font(fontp->fontname);
 
 	if (t1p == NULL)
 	    return NULL;
 
 	if (t1p->bad) {
 	    if (debug & DBG_OPEN)
 		printf("Font %s is marked as bad:  skipping scalable version\n",
 		  fontp->fontname);
 	    return NULL;
 	}
 
 	ftp = t1p->ft;
 	if (ftp != NULL) {	/* if it's is already in use at another size */
 	    struct font *first_size;
 
 	    /* The first node in the linked list of sizes contains the file */
 	    /* reference, so we link in the new node after the first node */
 	    first_size = ftp->first_size;
 	    fontp->next_size = first_size->next_size;
 	    first_size->next_size = fontp;
 	}
 	else {	/* first use at this size */
 	    t1p->ft = ftp = xmalloc(sizeof *ftp);
 	    ftp->face = NULL;
 	    ftp->t1 = t1p;
 	    ftp->first_size = fontp;
 	    fontp->next_size = NULL;
 	}
 	fontp->ft = ftp;
 	fontp->size = NULL;
 
 	return t1p;
 }
 
 
 FILE *
 open_t1_font(t1p, path_ret)
 	struct avl_t1	*t1p;
 	const char	**path_ret;
 {
 	FILE		*f;
 
 	/*
 	 * Set up the search paths, if necessary.
 	 */
 
 	if (search_type1.path1 == no_f_str_type1) {	/* if uninitialized */
 	    if ((search_type1.path1 = getenv("XDVIT1FONTS")) == NULL
 	      && (search_type1.path1 = getenv("T1FONTS")) == NULL
 	      && (search_type1.path1 = getenv("T1INPUTS")) == NULL
 	      && (search_type1.path1 = getenv("TEXFONTS")) == NULL
 	      && (search_type1.path1 = getenv("XDVIHEADERS")) == NULL
 	      && (search_type1.path1 = getenv("TEXPSHEADERS")) == NULL
 	      && (search_type1.path1 = getenv("PSHEADERS")) == NULL) {
 		search_type1.path1 = search_type1.path2;
 		search_type1.path2 = NULL;
 	    }
 	}
 
 	if (t1p->fontfile == NULL) {	/* look up in GS Fontmap */
 	    static Boolean gs_fontmap_initialized = False;
 
 	    if (!gs_fontmap_initialized) {
 		read_gs_fontmaps();
 		gs_fontmap_initialized = True;
 	    }
 
 	    if (debug & DBG_OPEN)
 		printf(
 		  "Looking for font %.*s using gs method (PS name %s) --\n",
 		  t1p->key_len, t1p->key, t1p->psname);
 	    f = lookup_gs_font(t1p->psname, path_ret);
 
 	    if (f == NULL) {
 		warnx("cannot find Type 1 font '%s'", t1p->psname);
 		return NULL;
 	    }
 
 	    if (debug & DBG_OPEN)
 		printf("Found file %s\n", *path_ret);
 	}
 	else {
 	    f = filefind(t1p->fontfile, &search_type1, path_ret);
 
 	    if (f == NULL) {
 		warnx("cannot find Type 1 font file '%s' (will try PK version instead)",
 		  t1p->fontfile);
 		return NULL;
 	    }
 	}
 
 	return f;
 }
 
 
 /*
  *	Read the encoding vector file.  This assumes the same format as afm2tfm.
  */
 
 void
 read_encoding(encp)
 	struct avl_enc	*encp;
 {
 	FILE		*f;
 	struct gsfile	gsf;
 	unsigned char	buffer[GS_BUF_SIZE];
 	jmp_buf		err_env;
 	unsigned char	ttype;
 	unsigned int	pos1, pos2;
 	unsigned int	identindex[256];
 	const char	*str;
 	unsigned int	i;
 
 	if (debug & DBG_OPEN)
 	    printf("Reading encoding file %s\n", encp->key);
 
 	encp->valid = False;
 
 	/*
 	 * Set up the search paths, if necessary.
 	 */
 
 	if (search_enc.path1 == no_f_str_enc) {		/* if uninitialized */
 	    if ((search_enc.path1 = getenv("XDVIENCS")) == NULL
 	      && (search_enc.path1 = getenv("ENCFONTS")) == NULL
 	      && (search_enc.path1 = getenv("TEXFONTS")) == NULL) {
 		search_enc.path1 = search_enc.path2;
 		search_enc.path2 = NULL;
 	    }
 	}
 
 	f = filefind(encp->key, &search_enc, NULL);
 	if (f == NULL) {
 	    warnx("cannot find encoding file '%s'; ignoring encoding",
 		encp->key);
 	    return;
 	}
 
 	if (gs_ctype[0] == 0)
 	    init_gs_ctype();
 
 	gsf.f = f;
 	gsf.buffer = buffer;
 	gsf.bufpos = gsf.buf_end = buffer + GS_BUF_SIZE;
 
 	if (!setjmp(err_env)) {
 	    if (get_gs_token(&gsf, 0, &pos1, "encoding") != '/'
 	      || get_gs_character(&gsf) != '[')
 		longjmp(err_env, 1);
 
 	    pos1 = 0;
 	    for (i = 0; i < 256; ++i) {
 		if (get_gs_token(&gsf, pos1, &pos2, "encoding") != '/')
 		    longjmp(err_env, 1);
 		if (pos2 == pos1 + 8
 		  && memcmp(ffline + pos1, "/.notdef", 8) == 0)
 		    identindex[i] = 0;
 		else {
 		    ffline[pos1] = '\0';
 		    identindex[i] = pos1 + 1;
 		    pos1 = pos2;
 		}
 	    }
 
 	    if (get_gs_character(&gsf) != ']')
 		longjmp(err_env, 1);
 
 	    ttype = get_gs_token(&gsf, pos1, &pos2, "encoding");
 	    if (!(ttype == GS_EOF
 	      || (ttype == 'd' && pos2 == pos1 + 3
 	      && memcmp(ffline + pos1, "def", 3) == 0
 	      && get_gs_token(&gsf, pos2, &pos2, "encoding") == GS_EOF)))
 		longjmp(err_env, 1);
 
 	    if (pos1 >= ffline_len) expandline(pos1 + 1);
 	    ffline[pos1] = '\0';
 	    str = xmemdup(ffline + 1, pos1);
 	    for (i = 0; i < 256; ++i)
 		encp->vec[i] =
 		  (identindex[i] != 0 ? str + identindex[i] - 1 : NULL);
 
 	    encp->valid = True;
 	}
 	else	/* if error */
 	    warnx("invalid format in encoding file '%s'; giving up.",
 		encp->key);
 
 	fclose(f);
 }
 
 
 
 void
 init_font_open()
 {
 	char		*size_list;
 	int		*sp, *sp1;
 	unsigned int	n;
 	char		*p;
 	FILE		*f;
 	const char	*dvipsrc;
 
 	sprintf(bdpi_string, "%d", pixels_per_inch);
 
 	if ((search_pkgf.path1 = getenv("XDVIFONTS")) == NULL
 #ifndef	XDVIFONTS_ONLY
 		&& (search_pkgf.path1 = getenv("PKFONTS")) == NULL
 		&& (search_pkgf.path1 = getenv("TEXPKS")) == NULL
 		&& (search_pkgf.path1 = getenv("TEXFONTS")) == NULL
 #endif
 		) {
 	    search_pkgf.path1 = search_pkgf.path2;
 	    search_pkgf.path2 = NULL;
 	}
 
 	/*
 	 * pk/gf searching is the only kind that uses more than three
 	 * characters in fF_etc, so these can be initialized once and then
 	 * forgotten.
 	 */
 
 	fF_values[2] = dpi_string;
 	fF_values[3] = bdpi_string;
 	fF_values[4] = "pk";
 	fF_values[5] = resource.mfmode;
 
 	if ((search_vf.path1 = getenv("XDVIVFS")) == NULL
 #ifndef	XDVIFONTS_ONLY
 		&& (search_vf.path1 = getenv("VFFONTS")) == NULL
 #endif
 		) {
 	    search_vf.path1 = search_vf.path2;
 	    search_vf.path2 = NULL;
 	}
 
 	size_list = getenv("XDVISIZES");
 	n = 1;	/* count number of sizes */
 	if (size_list == NULL || *size_list == '\0' || *size_list == PATH_SEP)
 	    for (p = default_size_list; (p = index(p, PATH_SEP)) != NULL; ++p)
 		++n;
 	if (size_list != NULL)
 	    for (p = size_list; (p = index(p, PATH_SEP)) != NULL; ++p) ++n;
 	sizes = xmalloc(n * sizeof(int));
 	sizend = sizes;	/* get the actual sizes */
 	if (size_list == NULL || *size_list == '\0' || *size_list == PATH_SEP)
 	    get_sizes(default_size_list, &sizend);
 	if (size_list != NULL && *size_list != '\0')
 	    get_sizes(size_list, &sizend);
 
 	/* sort the sizes (insertion sort) */
 	for (sp = sizes + 1; sp < sizend; ++sp)
 	    if (*sp < sp[-1]) {
 		int	i	= *sp;
 
 		sp1 = sp;
 		do
 		    *sp1 = sp1[-1];
 		while (--sp1 > sizes && i < sp1[-1]);
 		*sp1 = i;
 	    }
 
 	/* eliminate duplicates and erroneous values */
 	n = 0;	/* previous value */
 	for (sp = sp1 = sizes; sp < sizend; ++sp)
 	    if (*sp != n)
 		n = *sp1++ = *sp;
 	sizend = sp1;
 
 	/*
 	 * Initialize reading of Type 1 fonts and map files
 	 * (PS uses T1 fonts for MetaPost figures).
 	 */
 
 	if ((search_dvips_cf.path1 = getenv("XDVITYPE1CONFIG")) == NULL
 	  && (search_dvips_cf.path1 = getenv("TEXCONFIG")) == NULL) {
 	    search_dvips_cf.path1 = search_dvips_cf.path2;
 	    search_dvips_cf.path2 = NULL;
 	}
 
 	if ((search_fontmap.path1 = getenv("XDVIFONTMAPS")) == NULL
 	  && (search_fontmap.path1 = getenv("TEXFONTMAPS")) == NULL
 	  && (search_fontmap.path1 = getenv("TEXFONTS")) == NULL) {
 	    search_fontmap.path1 = search_fontmap.path2;
 	    search_fontmap.path2 = NULL;
 	}
 
 	if (ffline == NULL) expandline(80);
 
 	f = filefind("config.ps", &search_dvips_cf, NULL);
 	if (f != NULL)
 	    getdefaults(f);
 
 	dvipsrc = getenv("DVIPSRC");
 	if (dvipsrc == NULL) {
 	    dvipsrc = getenv("HOME");
 	    if (dvipsrc != NULL) {
 		n = strlen(dvipsrc);
 		if (n + 10 > ffline_len) expandline(n + 10);
 		memcpy(ffline, dvipsrc, n);
 		memcpy(ffline + n, "/.dvipsrc", 10);
 		dvipsrc = ffline;
 	    }
 	}
 	if (dvipsrc != NULL) {
 	    f = xfopen(dvipsrc, "r");
 	    if (f != NULL)
 		getdefaults(f);
 	}
 
 	f = filefind("config.xdvi", &search_dvips_cf, NULL);
 	if (f != NULL)
 	    getdefaults(f);
 
 	*p_tail = NULL;
 
 	/*
 	 * Look for the first (openable) map file.  Others will be read later
 	 * as needed.
 	 */
 
 	while (p_head != NULL) {
 	    mapfile = filefind(p_head->value, &search_fontmap, NULL);
 	    if (mapfile != NULL) {
 		if (debug & DBG_OPEN)
 		    printf("Map file: %s\n", p_head->value);
 		break;
 	    }
 	    warnx("Cannot open map file '%s'", p_head->value);
 	    p_head = p_head->next;
 	}
 }
 
 /*
  *	Try a given size.
  */
 
 static	FILE *
 try_size(font, dpi, ret_path)
 	const char	*font;
 	int		dpi;
 	const char	**ret_path;
 {
 	sprintf(dpi_string, "%d", dpi);
 
 	return filefind(font, &search_pkgf, ret_path);
 }
 
 
 /*
  *	Try a given font name
  */
 
 static	Boolean
 pre_font_open(struct font *fontp, const char *fontname, double fdpi,
 	const char **name_ret, int *dpi_ret)
 {
 	FILE	*f;
 	int	*p1, *p2;
 	int	dpi;
 	int	tempdpi;
 
 	*dpi_ret = dpi = fdpi + 0.5;
 
 	/*
 	 * First look for a scalable font.
 	 */
 
 	struct avl_t1 *t1p = lookup_t1_font(fontp);
 
 	if (t1p != NULL) {	/* if font found */
 		if (debug & DBG_OPEN)
 			printf("lookup_t1_font(%s) --> found %s\n",
 				fontp->fontname, t1p->fontfile != NULL ? 
 				t1p->fontfile : t1p->psname);
 
 		return True;
 	}
 
 	if (debug & DBG_OPEN)
 		printf("lookup_t1_font(%s) --> not found\n", fontp->fontname);
 
 	/*
 	 * Loop over sizes.  Try actual size first, then closest sizes.
 	 * If the pathname is absolutely or explicitly relative, don't
 	 * use the usual paths to search for it; just look for it in the
 	 * directory specified.
 	 */
 
 	f = try_size(fontname, dpi, name_ret);
 	if (f != NULL) {
 	    fontp->file = f;
 	    return True;
 	}
 
 	/* Try at one away from the size we just tried, to account
 	   for rounding error.  */
 	tempdpi = dpi + (dpi < fdpi ? 1 : -1);
 	f = try_size(fontname, tempdpi, name_ret);
 	if (f != NULL) {
 	    fontp->file = f;
 	    *dpi_ret = tempdpi;
 	    return True;
 	}
 
 	/* Try a virtual font. */
 	f = filefind(fontname, &search_vf, name_ret);
 	if (f != NULL) {
 	    fontp->file = f;
 	    return True;
 	}
 
 	/* Now try at all the sizes. */
 	for (p2 = sizes; p2 < sizend; ++p2) if (*p2 >= dpi) break;
 	p1 = p2;
 	for (;;) {
 		/* find another resolution */
 	    if (p1 <= sizes)
 		if (p2 >= sizend) return False;
 		else tempdpi = *p2++;
 	    else if (p2 >= sizend || (long) dpi * dpi <= (long) p1[-1] * *p2)
 		    tempdpi = *--p1;
 		else tempdpi = *p2++;
 	    f = try_size(fontname, *dpi_ret = tempdpi, name_ret);
 	    if (f != NULL) {
 		fontp->file = f;
 		return True;
 	    }
 	}
 }
 
 /*
  *	font_open()
  *
  *	This is the publicly accessible routine.  It uses the following fields
  *	in the font structure:
  *		fontname
  *		magstepval
  *		fsize
  *		filename
  *		ft
  *		next_size
  *		size
  */
 
 Boolean
 font_open(fontp, font_ret, dpi_ret)
 	struct font	*fontp;
 	char		**font_ret;
 	int		*dpi_ret;
 {
 	Boolean	val;
 	int	actual_pt, low_pt, high_pt, trial_pt;
 	char	*fn, *fnend;
 
 	val = pre_font_open(fontp, fontp->fontname, fontp->fsize,
 	  &fontp->filename, dpi_ret);
 	if (val || ev_flags & EV_GE_NEWDOC) {
 	    *font_ret = NULL;
 	    return val;
 	}
 
 	fn = xmalloc(strlen(fontp->fontname) + 2);
 	strcpy(fn, fontp->fontname);
 	fnend = fn + strlen(fn);
 	while (fnend > fn && fnend[-1] >= '0' && fnend[-1] <= '9') --fnend;
 	actual_pt = low_pt = high_pt = atoi(fnend);
 	if (actual_pt) {
 	    low_pt = actual_pt - 1;
 	    high_pt = actual_pt + 1;
 	    for (;;) {
 		if (2 * low_pt >= actual_pt &&
 		    (low_pt * high_pt > actual_pt * actual_pt ||
 		    high_pt > actual_pt + 5))
 			trial_pt = low_pt--;
 		else if (high_pt > actual_pt + 5) break;
 		else trial_pt = high_pt++;
 		sprintf(fnend, "%d", trial_pt);
 		if (pre_font_open(fontp, fn,
 		  fontp->fsize * actual_pt / trial_pt,
 		  &fontp->filename, dpi_ret)) {
 		    *font_ret = fn;
 		    return True;
 		}
 	    }
 	}
 	free(fn);
 
 	if (resource._alt_font != NULL) {
 	    if (pre_font_open(fontp, resource._alt_font, fontp->fsize,
 	      &fontp->filename, dpi_ret)) {
 		*font_ret = xstrdup(resource._alt_font);
 		return True;
 	    }
 	}
 	return False;
 }