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/*
* man2html.c -- convert nroff output to html
*
* Convert backspace/overstrikes to bold.
* Convert backspace/underbar (either order) to italic.
* Convert bar/backspace/dash to `+' (also handle bold rendering)
* Convert bar/backspace/equals to `*' (also handle bold rendering)
* Convert plus/backspace/o to `o'
* Convert `<' to `<'; `>' to `>'; and `&' to `&'
* If -u specified, compress duplicate blank lines.
*
* $Id: man2html.c,v 1.1 2000/07/13 06:30:22 michael Exp $
*/
#include <stdio.h>
#define BUFSIZE 4096
main(argc, argv)
int argc;
char *argv[];
{
char buf[BUFSIZE];
static int blank = 1, uopt = 0, lineno = 0, bksp = 0;
/*
* Options.
*/
if (argc > 2)
usage();
if (argc == 2) {
if (strcmp(argv[1], "-u") == 0)
uopt = 1;
else
usage();
}
/*
* Enclose in html envelope
*/
puts("<BODY><PRE>");
/*
* Process each line. Count unresolved backspaces and issue
* a warning message at the end.
*/
while (fgets(buf, BUFSIZE, stdin)) {
lineno++;
/*
* if -u specified, compress duplicate blank lines
*/
if (uopt) {
if (blankline(buf)) {
if (blank)
continue;
else
blank = 1;
} else
blank = 0;
}
bksp += html(buf, lineno);
}
/*
* Close html envelope.
*/
puts("</PRE></BODY>");
/*
* Warn about any unresolved backspaces.
*/
if (bksp > 0)
fprintf(stderr,
"man2html: warning: %d unresolved backspaces\n", bksp);
exit(0);
}
usage()
{
fprintf(stderr, "man2html: usage: man2html [-u]\n");
exit(1);
}
/*
* Given a line, print it out as html.
* Return the number of unprocessed backspaces in this line.
*/
int
html(s, lineno)
char *s;
int lineno;
{
char *p;
int bold, italic, bksp;
unsigned char buf2[BUFSIZE];
/*
* two bits in each element of buf2 indicate attributes of
* corresponding character in `s'.
* bit 1, when set, indicates bold
* bit 2, when set, indicates underscore
*/
/*
* pass 1: set character attributes (and delete overstrikes)
*/
bzero(buf2, BUFSIZE);
for (p = s; *p; p++) {
if (p == s || *p != '\b')
continue;
/* detect a backspace/overstrike (bold <B>) */
if (*(p - 1) == *(p + 1)) {
/* get rid of backspace and overstrike */
strcpy(p - 1, p + 1);
/* flag character as bold */
buf2[p - 1 - s] |= 1;
p--;
/* detect an underbar/backspace (italic <I>) */
} else if (*(p - 1) == '_') {
/* get rid of backspace and underbar */
strcpy(p - 1, p + 1);
/* flag character as underscored */
buf2[p - 1 - s] |= 2;
p--;
/* detect a backspace/underbar (reverse of above) */
} else if (*(p + 1) == '_') {
/* get rid of backspace and underbar */
strcpy(p, p + 2);
/* flag character as underscored */
buf2[p - 1 - s] |= 2;
p--;
/* convert bar/backspace/dash to `+' */
} else if (strncmp(p - 1, "|\b-", 3) == 0
|| strncmp(p - 1, "+\b-", 3) == 0
|| strncmp(p - 1, "+\b|", 3) == 0) {
/* get rid of backspace and bar, change dash to `+' */
strcpy(p - 1, p + 1);
*(p - 1) = '+';
p--;
/* convert bar/backspace/equals to `*' */
} else if (strncmp(p - 1, "|\b=", 3) == 0
|| strncmp(p - 1, "*\b=", 3) == 0
|| strncmp(p - 1, "*\b|", 3) == 0) {
strcpy(p - 1, p + 1);
*(p - 1) = '*';
p--;
/* convert plus/backspace/o to bold `o' */
} else if (strncmp(p - 1, "+\bo", 3) == 0
|| strncmp(p - 1, "o\b+", 3) == 0) {
strcpy(p - 1, p + 1);
*(p - 1) = 'o';
/* flag character as bold */
buf2[p - 1 - s] |= 1;
p--;
}
}
/*
* pass 2: print out line as html
*/
bold = italic = bksp = 0;
for (p = s; *p; p++) {
/* bold */
if (buf2[p - s] & 1) {
if (!bold) {
/*
* an overstrike/underbar is ambiguous.
* change to italic if we are in an italic
* context right now
*/
if (italic && *p == '_')
buf2[p - s] |= 2;
else {
fputs("<B>", stdout);
bold = 1;
}
}
} else {
if (bold && *p != ' ') {
fputs("</B>", stdout);
bold = 0;
}
}
/* italic */
if (buf2[p - s] & 2) {
if (!italic) {
fputs("<I>", stdout);
italic = 1;
}
} else {
if (italic && *p != ' ') {
fputs("</I>", stdout);
italic = 0;
}
}
/* print the char, escaping the three html special chars */
switch (*p) {
case '<':
fputs("<", stdout);
break;
case '>':
fputs(">", stdout);
break;
case '&':
fputs("&", stdout);
break;
case '\b':
#ifdef notdef
fprintf(stderr,
"man2html: warning, \\b on line %d\n", lineno);
#endif
bksp++;
default:
putchar(*p);
}
}
if (bold)
fputs("</B>", stdout);
if (italic)
fputs("</I>", stdout);
return(bksp);
}
int
blankline(s)
char *s;
{
while (*s) {
if (!isspace(*s))
return(0);
s++;
}
return(1);
}
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