//process a line at a time
//this is the heart of the program
//it takes a line and adds all declared variables to a binary tree
//comments and strings are ignored
struct tnode *processline(char *line, struct tnode *root)
{
while(*line != '\0' && *line != '\n') {
while(isspace(*line)) //skip whitespace
line++;
if(ignore)
line += ignoreend(line); //process if ignore should be switched to 0
else {
int c = specialchar(line); //see if line has any special characters
if(c == BREAK)
break;
else if(c == CONTINUE) {
line++;
continue;
}
if(isalnum(*line)) {
line += getnextword(line);
if(istype(word)) {
line += getnextvar(line);
if(*line == '(') { //if var is actually a function
line++;
while(*line != ')' && *line != '\0')
line++;
}
else //var is a variable not a function
if(var[0] != '\0')
root = addtree(root, var); //add variable to binary tree
}
}
else //if character is not alphanumeric
line++;
}
}
return root;
}
/*
* expesc
*
* Expand escape sequences in the buffer <src>, placing the results
* in buffer <dest>. If the number of characters written into <dest>
* would be more than <len-1> characters, then abort with an error
* message.
*/
void
expesc (char *src, char *dest, size_t len) {
register char *s;
register char *t;
register char *pstr;
register int i;
register int val;
register int autoinc;
char c;
char fs[5]; /* for font change */
char nrstr[20];
char fmt[20];
char name[10];
int nreg;
char *pfs;
int inc;
int tmp;
char delim;
const char *percent = "%";
char *scratch;
s = src;
t = dest;
/*
* if escape parsing is not on, just copy string
*/
if (dc.escon == NO) {
if (strlen(src) > len-1) {
errx(-1, "buffer overflow at %s:%d", __FILE__, __LINE__);
}
strcpy (dest, src);
return;
}
/*
* do it...
*/
while (*s != EOS) {
if (*s != dc.escchr) {
/*
* not esc, continue...
*/
*t++ = *s++;
} else if (*(s + 1) == dc.escchr) {
/*
* \\ escape escape
*/
*t++ = *s++;
++s;
} else {
switch(*(s+1)) {
case 'n':
/*
* \nx, \n(xx register
*
* first check for \n+... or \n-... (either form)
*/
s += 2;
autoinc = 0;
if (*s == '+') {
autoinc = 1;
s += 1;
}
if (*s == '-') {
autoinc = -1;
s += 1;
}
/*
* was this \nx or \n(xx form?
*/
if (isalpha (*s)) {
/*
* \nx form. find reg (a-z)
*/
nreg = tolower (*s) - 'a';
/*
* was this \n+x or \n-x? if so, do the
* auto incr
*/
if (autoinc > 0) {
dc.nr[nreg] += dc.nrauto[nreg];
} else if (autoinc < 0) {
dc.nr[nreg] -= dc.nrauto[nreg];
}
/*
* display format
*/
if (dc.nrfmt[nreg] == '1') {
/*
* normal decimal digits
*/
t += itoda (dc.nr[nreg], t, 6) - 1;
} else if (dc.nrfmt[nreg] == 'i') {
/*
* lower roman
*/
t += itoroman (dc.nr[nreg], t, 24) - 1;
} else if (dc.nrfmt[nreg] == 'I') {
/*
* upper roman
*/
t += itoROMAN (dc.nr[nreg], t, 24) - 1;
} else if (dc.nrfmt[nreg] == 'a') {
/*
* lower letters
*/
t += itoletter (dc.nr[nreg], t, 12) - 1;
} else if (dc.nrfmt[nreg] == 'A') {
/*
* upper letters
*/
t += itoLETTER (dc.nr[nreg], t, 12) - 1;
} else if (dc.nrfmt[nreg] & 0x80) {
/*
* zero-filled decimal
*/
sprintf (fmt, "%%0%dld", (int)(dc.nrfmt[nreg] & 0x7F));
fmt[5] = '\0';
sprintf (nrstr, fmt, (long) dc.nr[nreg]);
tmp = dc.nrfmt[nreg] & 0x7F;
nrstr[tmp] = '\0';
strcpy (t, nrstr);
t += strlen (nrstr);
} else {
/*
* normal (default)
*/
t += itoda (dc.nr[nreg], t, 6) - 1;
}
++s;
} else if (*s == '%') {
/*
* \n% form. find index into reg struct
*/
FINDREG(percent, nreg, scratch);
if (nreg < 0) {
errx(-1, "no register match");
}
/*
* was this \n+% or \n-%? if so, do the
* auto incr
*/
if (autoinc > 0) {
rg[nreg].rval += rg[nreg].rauto;
} else if (autoinc < 0) {
rg[nreg].rval -= rg[nreg].rauto;
}
/*
* display format
*/
if (rg[nreg].rfmt == '1') {
/*
* normal decimal digits
*/
t += itoda (rg[nreg].rval, t, 6) - 1;
} else if (rg[nreg].rfmt == 'i') {
/*
* lower roman
*/
t += itoroman (rg[nreg].rval, t, 24) - 1;
} else if (rg[nreg].rfmt == 'I') {
/*
* upper roman
*/
t += itoROMAN (rg[nreg].rval, t, 24) - 1;
} else if (rg[nreg].rfmt == 'a') {
/*
* lower letters
*/
t += itoletter (rg[nreg].rval, t, 12) - 1;
} else if (rg[nreg].rfmt == 'A') {
/*
* upper letters
*/
t += itoLETTER (rg[nreg].rval, t, 12) - 1;
} else if (rg[nreg].rfmt & 0x80) {
/*
* zero-filled decimal
*/
sprintf (fmt, "%%0%dld",
(int)(rg[nreg].rfmt & 0x7F));
fmt[5] = '\0';
sprintf (nrstr, fmt, (long) rg[nreg].rval);
tmp = rg[nreg].rfmt & 0x7F;
nrstr[tmp] = '\0';
strcpy (t, nrstr);
t += strlen (nrstr);
} else {
/*
* normal (default)
*/
t += itoda (rg[nreg].rval, t, 6) - 1;
}
s += 1;
} else if (*s == '(') {
/*
* \n(xx form. find index into reg struct
*/
s += 1;
name[0] = *s;
name[1] = *(s + 1);
if (name[1] == ' ' || name[1] == '\t'
|| name[1] == '\n' || name[1] == '\r') {
name[1] = '\0';
}
name[2] = '\0';
FINDREG(name, nreg, scratch);
if (nreg < 0) {
errx(-1, "no register match");
}
/*
* was this \n+(xx or \n-(xx? if so, do the
* auto incr
*/
if (rg[nreg].rflag & RF_WRITE) {
if (autoinc > 0) {
rg[nreg].rval += rg[nreg].rauto;
} else if (autoinc < 0) {
rg[nreg].rval -= rg[nreg].rauto;
}
}
/*
* display format
*/
if (rg[nreg].rfmt == '1') {
/*
* normal decimal digits
*/
t += itoda (rg[nreg].rval, t, 6) - 1;
} else if (rg[nreg].rfmt == 'i') {
/*
* lower roman
*/
t += itoroman (rg[nreg].rval, t, 24) - 1;
} else if (rg[nreg].rfmt == 'I') {
/*
* upper roman
*/
t += itoROMAN (rg[nreg].rval, t, 24) - 1;
} else if (rg[nreg].rfmt == 'a') {
/*
* lower letters
*/
t += itoletter (rg[nreg].rval, t, 12) - 1;
} else if (rg[nreg].rfmt == 'A') {
/*
* upper letters
*/
t += itoLETTER (rg[nreg].rval, t, 12) - 1;
} else if (rg[nreg].rfmt & 0x80) {
/*
* zero-filled decimal
*/
sprintf (fmt, "%%0%dld",
(int)(rg[nreg].rfmt & 0x7F));
fmt[5] = '\0';
sprintf (nrstr, fmt, (long) rg[nreg].rval);
tmp = rg[nreg].rfmt & 0x7F;
nrstr[tmp] = '\0';
strcpy (t, nrstr);
t += strlen (nrstr);
} else {
/*
* normal (default)
*/
t += itoda (rg[nreg].rval, t, 6) - 1;
}
s += 2;
}
break;
case '"': /* \" comment */
*s = EOS;
*t = *s;
return;
case '*': /* \*x, \*(xx string */
/*
*/
s += 2;
if (*s == '(') {
/*
* \*(xx form
*/
s += 1;
name[0] = *s;
name[1] = *(s + 1);
name[2] = '\0';
pstr = getstr (name);
if (!pstr) {
errx(-1,"string not found");
}
while (*pstr) {
*t++ = *pstr++;
}
s += 2;
} else {
/*
* \*x form
*/
name[0] = *s;
name[1] = '\0';
pstr = getstr (name);
if (!pstr) {
errx(-1, "string not found");
}
while (*pstr) {
*t++ = *pstr++;
}
s += 1;
}
break;
case 'f': /* \fx font */
s += 2;
pfs = fs; /* set up ret string */
fs[0] = '\0';
/*
* it parses 1-2 char of s and returns esc seq for
* \fB and \fR (\fI is same as \fB)
*/
fontchange (*s, pfs);
/*
* imbed the atari (vt52) escape seq
*/
while (*pfs) {
*t++ = *pfs++;
}
++s; /* skip B,I,R,S,P */
break;
case '(': /* \(xx special char */
{
char *cp;
s += 2;
cp = specialchar(s);
while (*cp) *t++ = *cp++;
s += 2;
}
break;
case 'e': /* \e printable version of escape */
*t++ = dc.escchr;
s += 2;
break;
case '-': /* \- minus */
case '`': /* \` grave, like \(ga */
case '\'': /* \' accute, like \(aa */
case '.': /* \. period */
case ' ': /* \(space) space */
/* verbatim */
*t++ = *(s+1);
s += 2;
break;
case '0': /* \0 digital width space */
*t++ = ' ';
s += 2;
break;
case '|': /* \| narrow width char (0 in nroff) */
case '^': /* \^ narrow width char (0 in nroff) */
case '&': /* \& non-printing zero width */
case '!': /* \! transparent copy line */
case '$': /* \$N interpolate arg 1<=N<=9 */
case 'a': /* \a */
case 'b': /* \b'abc...' */
case 'c': /* \c */
case 'd': /* \d */
case 'k': /* \kx */
case 'l': /* \l'Nc' */
case 'L': /* \L'Nc' */
case 'p': /* \p */
case 'r': /* \r */
case 's': /* \sN,\s+-N */
case 'u': /* \u */
case 'w': /* \w'str' */
case 'x': /* \x'N' */
case '{': /* \{ */
case '}': /* \} */
case '\n': /* \(newline) ignore newline */
case '\r': /* \(newline) ignore newline */
s += 2; /* currently ignored */
break;
case '%': /* \% hyphen */
*t++ = '-';
*t++ = '-';
s += 2;
break;
case 'h': /* \h'N' horiz motion*/
s += 2;
delim = *s++;
val = atoi (s);
for (i = 0; i < val; i++) {
*t++ = ' ';
}
while (*s != delim) {
if (*s == 0) {
break;
}
s++;
}
if (*s) {
s++;
}
break;
case 'o': /* \o'abc...' overstrike*/
s += 2;
delim = *s++;
while (*s != EOS && *s != delim) {
*t++ = *s++;
*t++ = 0x08;
}
s++;
break;
case 't': /* \t horizontal tab*/
*t++ = '\t';
s += 2;
break;
case 'v': /* \v'N' vert tab*/
s += 2;
delim = *s++;
val = atoi (s);
for (i = 0; i < val; i++) {
*t++ = 0x0A;
}
while (*s != delim) {
if (*s == 0) {
break;
}
s++;
}
if (*s) {
s++;
}
break;
case 'z': /* \zc print c w/o spacing*/
s += 2;
*t++ = *s++;
*t++ = 0x08;
break;
default: /* \X any other character not above*/
s += 1;
*t++ = *s++;
break;
}
}
}
/*
* end the string and return it in original buf
*/
*t = EOS;
if (strlen(dest) > len-1) {
errx(-1, "buffer overflow at %s:%d", __FILE__, __LINE__);
}
strcpy (src, dest);
}