470 lines
11 KiB
C
470 lines
11 KiB
C
/*
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* Fix the Netscape executable for specified font widths
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*
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* (c) 1999 Copyright by Sergey Babkin
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* see COPYRIGHT
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*/
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#include <sys/types.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <locale.h>
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#include <unistd.h>
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/************************** DEFINES *************************/
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#undef DEBUG
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/* we can handle at most this many fonts */
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#define MAXFONTS 20
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/* maximal line buffer size */
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#define MAXLINE 512
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/* there may be multiple strings with the same contents */
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#define MAXDUPS 10
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/* file read buffer size */
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#define FILEBF 40960
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/* bits in the hardware page offset */
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#define BITSPERPAGE 12
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/* size of page in bytes */
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#define PAGESIZE (1<<BITSPERPAGE)
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/* mask of the in-page offset */
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#define PAGEMASK (PAGESIZE-1)
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/* this is machine-dependent! */
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typedef short t2b; /* 2-byte type */
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typedef int t4b; /* 4-byte type */
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typedef int tptr; /* integer type with the same size as pointer */
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struct bbox { /* bounding box */
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t2b llx; /* lower-left-x */
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t2b lly;
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t2b urx;
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t2b ury; /* upper-right-y */
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};
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struct glyphmetrics { /* metrics of one glyph */
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t2b width;
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t2b unknown;
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struct bbox bbox;
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};
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struct fontmetrics { /* metrics of the wholefont */
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tptr name;
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struct bbox bbox;
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t2b underlinepos;
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t2b underlinethick;
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struct glyphmetrics glyphs[256];
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};
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struct font {
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char nsname[MAXLINE]; /* name in the Netscape binary */
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char afmname[MAXLINE]; /* name of the .afm file */
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char pfaname[MAXLINE]; /* name of the .pfa (or .pfb) file */
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struct fontmetrics metrics;
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off_t binoff; /* offset in the binary */
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};
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#define SCONST(x) (x), ((sizeof (x))-1)
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/************************** GLOBALS *************************/
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struct font font[MAXFONTS];
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int nfonts=0;
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char msg[MAXLINE];
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/*************************** PROTOTYPES **********************/
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void usage(void);
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void readconfig( char *fn);
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void readmetrics(void);
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void replacefonts( char *fn);
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/************************** main ****************************/
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main(ac, av)
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int ac;
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char **av;
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{
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setlocale(LC_ALL, "");
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if(ac!=3) {
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usage(); exit(1);
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}
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readconfig(av[2]);
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readmetrics();
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replacefonts( av[1]);
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}
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/************************** usage ***************************/
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void
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usage(void)
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{
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fprintf(stderr,"Use:\n");
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fprintf(stderr," nsfix <netscape.bin> <config-file>\n");
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}
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/************************** readconfig **********************/
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void
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readconfig(fn)
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char *fn;
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{
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char s[MAXLINE];
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char afmsuffix[MAXLINE], pfasuffix[MAXLINE];
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int lineno=0;
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FILE *f;
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if(( f=fopen(fn, "r") )==NULL) {
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sprintf(msg,"nsfix: open %s",fn);
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perror(msg);
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exit(1);
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}
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while( fgets(s, MAXLINE, f) ) {
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lineno++;
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if(s[0]=='#' || s[0]=='\n')
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continue;
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if(nfonts>=MAXFONTS) {
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fprintf(stderr, "nsfix: only %d fonts are supported at once\n",
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MAXFONTS);
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exit(1);
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}
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if( sscanf(s, "%s %s %s %s", font[nfonts].nsname,
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font[nfonts].afmname, afmsuffix, pfasuffix) != 4 ) {
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fprintf(stderr, "nsfix: syntax error at line %d of %s\n",
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lineno, fn);
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exit(1);
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}
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strcpy(font[nfonts].pfaname, font[nfonts].afmname);
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strcat(font[nfonts].afmname, afmsuffix);
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strcat(font[nfonts].pfaname, pfasuffix);
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nfonts++;
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}
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if(nfonts==0) {
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fprintf(stderr, "nsfix: no fonts are defined in %s\n", fn);
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exit(1);
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}
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fclose(f);
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}
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/************************** readmetrics *********************/
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void
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readmetrics(void)
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{
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int i;
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char s[MAXLINE];
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FILE *f;
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int n;
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int lineno;
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int code, width, llx, lly, urx, ury;
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char gn[MAXLINE];
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struct glyphmetrics *gm;
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for(i=0; i<nfonts; i++) {
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if(( f=fopen(font[i].afmname, "r") )==NULL) {
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sprintf(msg,"nsfix: open %s", font[i].afmname);
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perror(msg);
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exit(1);
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}
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lineno=0;
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while( fgets(s, MAXLINE, f) ) {
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lineno++;
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if( !strncmp(s, SCONST("UnderlineThickness ")) ) {
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if( sscanf(s, "UnderlineThickness %d", &n) <1) {
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fprintf(stderr, "nsfix: weird UnderlineThickness at line %d in %s\n",
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lineno, font[i].afmname);
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exit(1);
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}
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font[i].metrics.underlinethick=n;
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} else if( !strncmp(s, SCONST("UnderlinePosition ")) ) {
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if( sscanf(s, "UnderlinePosition %d", &n) <1) {
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fprintf(stderr, "nsfix: weird UnderlinePosition at line %d in %s\n",
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lineno, font[i].afmname);
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exit(1);
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}
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font[i].metrics.underlinepos=n;
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} else if( !strncmp(s, SCONST("FontBBox ")) ) {
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if( sscanf(s, "FontBBox %d %d %d %d", &llx, &lly, &urx, &ury) <4) {
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fprintf(stderr, "nsfix: weird FontBBox at line %d in %s\n",
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lineno, font[i].afmname);
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exit(1);
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}
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font[i].metrics.bbox.llx=llx;
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font[i].metrics.bbox.lly=lly;
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font[i].metrics.bbox.urx=urx;
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font[i].metrics.bbox.ury=ury;
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} else if( !strncmp(s, SCONST("C ")) ) {
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if( sscanf(s, "C %d ; WX %d ; N %s ; B %d %d %d %d",
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&code, &width, &gn, &llx, &lly, &urx, &ury) <7)
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{
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fprintf(stderr, "nsfix: weird metrics at line %d in %s\n",
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lineno, font[i].afmname);
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exit(1);
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}
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if(code>=32 && code<=255) {
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font[i].metrics.glyphs[code].width=width;
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font[i].metrics.glyphs[code].bbox.llx=llx;
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font[i].metrics.glyphs[code].bbox.lly=lly;
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font[i].metrics.glyphs[code].bbox.urx=urx;
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font[i].metrics.glyphs[code].bbox.ury=ury;
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}
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}
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}
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fclose(f);
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}
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#ifdef DEBUG
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for(i=0; i<nfonts; i++) {
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printf("Font %s\n", font[i].nsname);
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for(n=0; n<256; n++) {
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gm= &font[i].metrics.glyphs[n];
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printf(" %d w=%4d [%4d %4d %4d %4d]", n, gm->width,
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gm->bbox.llx, gm->bbox.lly, gm->bbox.urx, gm->bbox.ury);
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printf(" w=0x%04x [0x%04x 0x%04x 0x%04x 0x%04x]\n", gm->width & 0xffff,
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gm->bbox.llx & 0xffff, gm->bbox.lly & 0xffff, gm->bbox.urx & 0xffff, gm->bbox.ury & 0xffff);
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}
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}
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exit(0);
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#endif
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}
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/************************** replacefonts ********************/
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void
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replacefonts(fn)
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char *fn;
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{
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int f; /* don't use stdio */
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char bf[FILEBF];
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char *bfend, *p;
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int len;
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off_t pos;
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off_t zerooff[MAXFONTS*MAXDUPS]; /* offset of zero strings */
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tptr nameaddr[MAXFONTS*MAXDUPS]; /* name pointers before these zero strings */
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int zeroid[MAXFONTS*MAXDUPS]; /* font number for this zero block */
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int nzeroes;
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short matched[MAXFONTS]; /* counters how many matches we have for each requested font */
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struct fontmetrics *fp;
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struct {
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int noff;
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int nz;
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off_t off[MAXDUPS]; /* there may be multiple strings with the same contents */
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} o[MAXFONTS];
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int maxnlen;
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int i, j, k, n;
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static struct glyphmetrics gm[32]; /* 0-initialized */
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if(( f=open(fn, O_RDWR) )<0) {
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sprintf(msg,"nsfix: open %s",fn);
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perror(msg);
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exit(1);
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}
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/* get the maximal font name length */
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maxnlen=0;
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for(i=0; i<nfonts; i++) {
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o[i].noff=o[i].nz=0;
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matched[i]=0;
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len=strlen(font[i].nsname)+1;
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if(len>maxnlen)
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maxnlen=len;
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}
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/* fprintf(stderr,"maxnlen= 0x%x\n", maxnlen); /* */
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/* try to find the literal strings of the font names */
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pos=0; bfend=bf;
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while(( len=read(f, bfend, FILEBF-(bfend-bf)) )>=0 ) {
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/* fprintf(stderr,"looking at 0x%lx\n", (long)pos); /* */
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/* the last position to check */
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if(len>=maxnlen)
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/* leave the rest with the next block */
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bfend+= len-maxnlen;
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else {
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/* we are very near to the end of file, check
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* up to the very last byte */
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bfend+= len-2;
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memset(bfend+2, 0, maxnlen);
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}
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for(p=bf; p<=bfend; p++)
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for(i=0; i<nfonts; i++)
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if(!strcmp(font[i].nsname, p) && o[i].noff<MAXDUPS) {
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o[i].off[ o[i].noff++ ] = pos + (p-bf);
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fprintf(stderr,"found %s at 0x%lx\n", font[i].nsname, (long)pos + (p-bf));
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}
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if(len==0)
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break;
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memmove(bf, bfend, maxnlen);
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pos+= (bfend-bf);
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bfend= (bf+maxnlen);
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}
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if(len<0) {
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sprintf(msg,"nsfix: read %s",fn);
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perror(msg);
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exit(1);
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}
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fprintf(stderr,"---\n");
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/* if there are any dups try to resolve them */
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for(i=0; i<nfonts; i++) {
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if(o[i].noff==0) {
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fprintf(stderr, "nsfix: font %s (%d of %d) is missing in %s\n",
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font[i].nsname, i, nfonts, fn);
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exit(1);
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}
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if(o[i].noff!=1)
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continue;
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/* good, only one entry */
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fprintf(stderr,"found unique %s at 0x%lx\n", font[i].nsname, (long)o[i].off[0] );
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/* if any dupped entry is right after this one then it's good */
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/* if it's farther than PAGESIZE/2 then it's bad */
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pos=o[i].off[0]+strlen(font[i].nsname)+1;
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for(j=0; j<MAXFONTS; j++) {
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if(o[j].noff<=1)
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continue;
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for(k=0; k<o[j].noff; k++) {
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if(o[j].off[k]==pos) { /* good */
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fprintf(stderr,"got unique %s at 0x%lx\n", font[j].nsname, (long)pos );
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o[j].off[0]=pos;
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o[j].noff=1;
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break;
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}
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if(o[j].off[k] < pos - PAGESIZE/2
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|| o[j].off[k] > pos + PAGESIZE/2) { /* bad */
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fprintf(stderr, "eliminated %s at 0x%lx\n", font[j].nsname, (long)o[j].off[k] );
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for(n=k+1; n<o[j].noff; n++)
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o[j].off[n-1]=o[j].off[n];
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o[j].noff--;
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k--;
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}
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}
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if(o[j].noff==1 && j<i) { /* have to revisit this font */
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i=j-1; /* compensate for i++ */
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break;
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}
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}
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}
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/* try to find the metric tables in the executable */
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if(lseek(f, (off_t)0, SEEK_SET)<0) {
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sprintf(msg,"nsfix: rewind %s",fn);
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perror(msg);
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exit(1);
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}
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/*
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* search for the zeroes in place of the metrics for the codes 0-31:
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* 4-byte aligned strings of (32*sizeof(struct glyphmetrics)) zero bytes
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*/
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maxnlen=sizeof(struct fontmetrics);
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pos=0; bfend=bf; nzeroes=0;
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while(( len=read(f, bfend, FILEBF-(bfend-bf)) )>=0 ) {
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/* fprintf(stderr,"looking at 0x%lx\n", (long)pos); /* */
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/* the last position to check */
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bfend+= len-maxnlen; /* don't look beyond the EOF */
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for(p=bf; p<=bfend; p+=4 /* 4-byte aligned */ ) {
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fp=(struct fontmetrics *)p;
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if(fp->name==0)
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continue;
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if( memcmp(gm, fp->glyphs, sizeof gm) )
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continue;
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/* OK, looks like it, see if we can match it to any name */
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n= fp->name & PAGEMASK;
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for(i=0; i<nfonts; i++) {
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for(j=0; j<o[i].noff; j++)
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if( n==(o[i].off[j] & PAGEMASK) ) {
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zerooff[nzeroes]= pos + (p-bf);
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nameaddr[nzeroes]= fp->name;
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zeroid[nzeroes]=i;
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o[i].nz++;
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fprintf(stderr, "matched %s at 0x%lx\n",
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font[i].nsname, (long) zerooff[nzeroes]);
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nzeroes++;
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matched[i]++;
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break;
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}
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}
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}
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if(len==0)
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break;
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memmove(bf, bfend, maxnlen);
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pos+= (bfend-bf);
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bfend= (bf+maxnlen);
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}
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if(len<0) {
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sprintf(msg,"nsfix: read %s",fn);
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perror(msg);
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exit(1);
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}
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fprintf(stderr,"---\n");
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/* make sure that all the fonts got one match */
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k=0; /* flag: have non-matched fonts */ n=0; /* flag: have ambiguities */
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for(i=0; i<nfonts; i++)
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if(matched[i]==0)
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k=1;
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else if(matched[i]>1)
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n=1;
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if(k) {
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fprintf(stderr,"nsfix: can't find match for some of the fonts\n");
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fprintf(stderr,"nsfix: maybe wrong byte order, aborting\n");
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exit(1);
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}
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if(n) {
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fprintf(stderr,"nsfix: got multiple matches for some of the fonts\n");
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fprintf(stderr,"nsfix: can't resolve, aborting\n");
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exit(1);
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}
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/* now finally write the updated tables */
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for(i=0; i<nzeroes; i++) {
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j=zeroid[i];
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fprintf(stderr, "nsfix: writing table for %s at 0x%lx\n", font[j].nsname,
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(long)zerooff[i]);
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font[j].metrics.name=nameaddr[i];
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if( lseek(f, zerooff[i], SEEK_SET)<0 ) {
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sprintf(msg,"nsfix: seek %s to 0x%lx",fn, (long)zerooff[i] );
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perror(msg);
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exit(1);
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}
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if( write(f, &font[j].metrics, sizeof font[j].metrics) != sizeof font[j].metrics ) {
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sprintf(msg,"nsfix: write to %s",fn );
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perror(msg);
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exit(1);
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}
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}
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close(f);
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}
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