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#define DEBUG 0 /* 1:dummy main 2:numerical ascii codes off */
#include "esc.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#define THRU 0 /* THRU mode simply prints chars */
#define HOLD 1 /* HOLD mode stocks chars in bff[] */
#define MXBF 7 /* length of longest escape sequence excluding '&' */
#define CHARSET 256 /* set to 256 if ISO-8859-1 (European) */
static int scmp(char *, char *);
static int flush(int);
static int mode=THRU;
static char bff[MXBF];
static int index=0;
#if DEBUG == 1 /* dummy main */
void main(){
char ch;
while( (ch=getchar()) != EOF)
m_putchar(ch);
m_putchar(EOF);
}
#endif
struct table {
char * seq;
int n;
} ktbl[] = {
{"gt;" , 62},
{"lt;" , 60},
{"amp;" , 38},
{"quot;" , 34},
#if CHARSET == 128
{"nbsp;" , 32},
{"shy;" , 45},
#elif CHARSET == 256
{"nbsp;" , 160},
{"iexcl;" , 161},
{"cent;" , 162},
{"pound;" , 163},
{"curren;" , 164},
{"yen;" , 165},
{"brvbar;" , 166},
{"sect;" , 167},
{"uml;" , 168},
{"copy;" , 169},
{"ordf;" , 170},
{"laquo;" , 171},
{"not;" , 172},
{"shy;" , 173},
{"reg;" , 174},
{"macr;" , 175},
{"deg;" , 176},
{"plusmn;" , 177},
{"sup2;" , 178},
{"sup3;" , 179},
{"acute;" , 180},
{"micro;" , 181},
{"para;" , 182},
{"middot;" , 183},
{"cedil;" , 184},
{"sup1;" , 185},
{"ordm;" , 186},
{"raquo;" , 187},
{"frac14;" , 188},
{"frac12;" , 189},
{"frac34;" , 190},
{"iquest;" , 191},
{"Agrave;" , 192},
{"Aacute;" , 193},
{"Acirc;" , 194},
{"Atilde;" , 195},
{"Auml;" , 196},
{"Aring;" , 197},
{"AElig;" , 198},
{"Ccedil;" , 199},
{"Egrave;" , 200},
{"Eacute;" , 201},
{"Ecirc;" , 202},
{"Euml;" , 203},
{"Igrave;" , 204},
{"Iacute;" , 205},
{"Icirc;" , 206},
{"Iuml;" , 207},
{"ETH;" , 208},
{"Ntilde;" , 209},
{"Ograve;" , 210},
{"Oacute;" , 211},
{"Ocirc;" , 212},
{"Otilde;" , 213},
{"Ouml;" , 214},
{"times;" , 215},
{"Oslash;" , 216},
{"Ugrave;" , 217},
{"Uacute;" , 218},
{"Ucirc;" , 219},
{"Uuml;" , 220},
{"Yacute;" , 221},
{"THORN;" , 222},
{"szlig;" , 223},
{"agrave;" , 224},
{"aacute;" , 225},
{"acirc;" , 226},
{"atilde;" , 227},
{"auml;" , 228},
{"aring;" , 229},
{"aelig;" , 230},
{"ccedil;" , 231},
{"egrave;" , 232},
{"eacute;" , 233},
{"ecirc;" , 234},
{"euml;" , 235},
{"igrave;" , 236},
{"iacute;" , 237},
{"icirc;" , 238},
{"iuml;" , 239},
{"eth;" , 240},
{"ntilde;" , 241},
{"ograve;" , 242},
{"oacute;" , 243},
{"ocirc;" , 244},
{"otilde;" , 245},
{"ouml;" , 246},
{"divide;" , 247},
{"oslash;" , 248},
{"ugrave;" , 249},
{"uacute;" , 250},
{"ucirc;" , 251},
{"uuml;" , 252},
{"yacute;" , 253},
{"thorn;" , 254},
{"yuml;" , 255},
#endif
{"" , 0}
};
int
m_putchar(int chr){
struct table *ptr;
if ( mode == THRU ) switch (chr){
case '&': mode=HOLD; return '&';
case EOF: return EOF;
default : return putchar(chr); /* most chars pass through here */
}
/* mode == HOLD */
else switch (chr) {
case '&': return flush(HOLD);
case EOF: return flush(THRU);
case ';': bff[index++]=';'; /* delimiter */
for(ptr=ktbl; !scmp(ptr->seq,bff); ptr++)
;
chr= ptr->n; /* chr == 0 if no match */
#if DEBUG == 0 || DEBUG == 2
if(chr==0 && bff[0]=='#') /* numerical ascii code */
/* without the following strong tests seqs like "K;" would fall through */
{
if( (bff[1]=='X' || bff[1]=='x')
&& isxdigit(bff[2]) && isxdigit(bff[3]) )
/* hexadecimal */
/* /&#[Xx][0-9A-Da-d][0-9A-Da-d];/ */
chr=strtoul( &bff[2], NULL, 16 );
else if( (bff[2]==';'
&& isdigit(bff[1]) )
/* decimal */
/* /&#[0-9];/ */
|| (bff[3]==';'
&& isdigit(bff[1]) && isdigit(bff[2]) )
/* decimal */
/* /&#[0-9][0-9];/ */
|| (bff[4]==';'
&& (bff[1]=='1' || bff[1]=='2')
&& isdigit(bff[2]) && isdigit(bff[3]) )
/* decimal */
/* /&#[12][0-9][0-9];/ */
)
chr=strtoul( &bff[1], NULL, 10);
}
#endif
if( ( chr<0 ) || ( chr==0)
|| ( 0<=chr && chr<= 8 ) || ( 11<=chr && chr<= 12 )
|| ( 14<=chr && chr<= 31 ) || ( 127<=chr && chr<=159 )
|| ( CHARSET<=chr )
) return flush(THRU); /* no match or undefined */
else { index=0; mode=THRU; return putchar(chr); }
/* print converted character */
default : bff[index++]=chr;
return(index==MXBF)?flush(THRU):chr;
}
}
static int
flush(int md){ /* sends chars in bff to output stream */
int r; int idx;
register int i;
idx=index; index=0; mode=md;
if((r=putchar('&'))==EOF) return EOF;
for(i=0;i<idx;i++)
if((r=putchar(bff[i]))==EOF) return EOF;
return r;
}
static int
scmp(char *s1, char *s2){ /* compares 2 strings */
while (1)
{
if(*s1 == '\0' ) return 1; /* note that only s1 is checked */
if(*s1++ != *s2++ ) return 0;
}
}
/* returns 1 if s1 points to an empty string "" */
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