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/* eus_help.c
EusLisp interface to Eushelp
1994/Jul/24
(c) 1994 Nakagaki, H., KEPCO
*/
static char *rcsid="@(#)$Id$";
#include "eus.h"
#pragma init (init_object_module)
extern pointer helpsub();
static void init_object_module()
{ add_module_initializer("helpsub", helpsub);}
#include <sys/types.h>
#include <unistd.h>
#define BUFSIZE 256
#define CHAR_SIZE 16384
static int bp=0;
static char buf[CHAR_SIZE];
static char us[4]={0x1b, 0x5b, 0x34, 0x6d}, /* underline start */
ue[3]={0x1b, 0x5b, 0x6d}, /* underline end */
so[4]={0x1b, 0x5b, 0x37, 0x6d}, /* highlight mode start */
se[3]={0x1b, 0x5b, 0x6d}, /* highlight mode end */
md[4]={0x1b, 0x5b, 0x31, 0x6d}, /* bold mode start */
me[3]={0x1b, 0x5b, 0x6d}; /* bold mode end */
/*****************************************************************/
/* READ_TEX( fp ) : read latex file and convert to eushelp */
/*****************************************************************/
static char READ_CHAR(fd)
int fd;
{
char c;
int r;
if ((bp == -1) || (bp == BUFSIZE)){
bp=0;
GC_REGION(r=read(fd, &buf[0], BUFSIZE););
}
c=buf[bp];
bp++;
return(c);
}
static int COMPARE_STRING(str)
char *str;
{
int mode=0;
if ((str[0] == 't') && (str[1] == 't'))
mode=1;
if ((str[0] == 'e') && (str[1] == 'm'))
mode=2;
if ((str[0] == 'i') && (str[1] == 't'))
mode=2;
if ((str[0] == 'b') && (str[1] == 'f'))
mode=3;
return(mode);
}
/* (read-tex fp) */
static pointer READ_TEX(ctx, n,argv)
context *ctx;
int n;
pointer argv[];
{ register int i,j, fd;
int brace=1, bslash=0, brace2=0, emphasis=0, kanji=0, mode;
off_t offset;
pointer fp, s;
char *sp, c, *ch;
static char str[CHAR_SIZE], cmd[10];
ckarg(2);
fp=argv[0];
offset=(off_t)ckintval(argv[1]);
fd=intval(fp->c.fstream.fd);
if (offset >= 0){
bp=-1;
lseek( fd, offset, 0);
}
for(;(c=READ_CHAR(fd)) != '{';);
for(sp=&str[0],j=0;brace != 0;){
c=READ_CHAR(fd);
if (kanji != 0){
*sp++=c;
if ( c == 27 ){
for(i=0;i<2;i++){ c=READ_CHAR(fd); *sp++=c;}
kanji=0;
}
}
else if (bslash != 0){
switch(c){
case '>' : for(i=0; i<3; i++) *sp++=' ';
case '=' : bslash=0; break;
case '^' : ;
case '~' : ;
case '_' : ;
case '%' : ;
case '&' : ;
case '#' : *sp++=c; bslash=0; break;
case '\\': *sp++=0x0a; bslash=0; break;
case ' ' : if ((mode=COMPARE_STRING(cmd)) != 0){
switch(mode){
case 1 : ch=us; break;
case 2 : ch=so; break;
case 3 : ch=md; break;
}
for(i=0;i<4;i++)
*sp++=ch[i];
emphasis=1;
}
bslash=0; break;
case '$' : ;
case '}' : if (j == 0) *sp++=c;
bslash=0; break;
case '[' : j=0; break;
case '{' : if (j == 0) {*sp++='{'; bslash=0; break;}
j=0; break;
case ']' : for(i=0;i<4;i++) *sp++=' ';
for(i=0;i<j;i++) *sp++=cmd[i];
bslash=0;
brace2=1;
break;
default : cmd[j++]=c; break;
}
}
else {
switch(c){
case '$' : break;
case '\\': bslash=1; j=0; break;
case '{' : brace++; break;
case '}' : if (emphasis != 0){
for(i=0;i<3;i++) *sp++=ue[i];
emphasis=0;
}
brace--; break;
case '%' : while ((c=READ_CHAR(fd)) != 10); break;
case 10 : if (brace2 == 1) *sp++=10; else *sp++=' ';
brace2=0; break;
case 27 : kanji=1; *sp++=27; break;
default : *sp++=c; break;
}
}
}
*sp=0;
j=strlen(str);
s=makestring(&str[0],j);
return(s);
}
/*****************************************************************/
/* eusmain routine */
/*****************************************************************/
pointer helpsub(ctx,n,argv)
context *ctx;
int n;
pointer argv[];
{ pointer mod=argv[0];
defun(ctx, "READ-TEX", mod, READ_TEX,NULL);
}
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