308 lines
7.1 KiB
C
308 lines
7.1 KiB
C
/*
|
|
* expand.c - macro expansion functions for cawf(1)
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 1991 Purdue University Research Foundation,
|
|
* West Lafayette, Indiana 47907. All rights reserved.
|
|
*
|
|
* Written by Victor A. Abell <abe@mace.cc.purdue.edu>, Purdue
|
|
* University Computing Center. Not derived from licensed software;
|
|
* derived from awf(1) by Henry Spencer of the University of Toronto.
|
|
*
|
|
* Permission is granted to anyone to use this software for any
|
|
* purpose on any computer system, and to alter it and redistribute
|
|
* it freely, subject to the following restrictions:
|
|
*
|
|
* 1. The author is not responsible for any consequences of use of
|
|
* this software, even if they arise from flaws in it.
|
|
*
|
|
* 2. The origin of this software must not be misrepresented, either
|
|
* by explicit claim or by omission. Credits must appear in the
|
|
* documentation.
|
|
*
|
|
* 3. Altered versions must be plainly marked as such, and must not
|
|
* be misrepresented as being the original software. Credits must
|
|
* appear in the documentation.
|
|
*
|
|
* 4. This notice may not be removed or altered.
|
|
*/
|
|
|
|
#include "cawf.h"
|
|
|
|
/*
|
|
* Expand(line) - expand macro or if/ie/el line
|
|
*/
|
|
|
|
void
|
|
Expand(line)
|
|
unsigned char *line;
|
|
{
|
|
unsigned char buf[2*MAXLINE]; /* line buffer */
|
|
unsigned char cmd[4]; /* nroff command */
|
|
int cmdl; /* command length */
|
|
int cmdx; /* cmd index in Macrotab[] */
|
|
int cond = 0; /* conditional statuses */
|
|
int i, j; /* temporary indexes */
|
|
int iflen; /* if statement length */
|
|
int invert; /* inversion status */
|
|
unsigned char *lp; /* line pointer */
|
|
int mx = -1; /* Macrotab[] index */
|
|
int n1, n2; /* temporary numbers */
|
|
int nargs = 0; /* number of arguments */
|
|
int nleft = 0; /* number of macro lines left */
|
|
char op; /* comparison operator */
|
|
int prevcond; /* previous condition (for else's) */
|
|
int ptr = -1; /* Macrotxt[] index */
|
|
int quote; /* quoted string status */
|
|
unsigned char *s1, *s2; /* temporary string pointers */
|
|
|
|
|
|
(void) sprintf((char *)buf, ".^= %d %s", NR, (char *)Inname);
|
|
Pass2(buf);
|
|
|
|
for (lp = line; *lp; ) {
|
|
invert = regexec(Pat[1].pat, lp);
|
|
prevcond = cond;
|
|
cond = 0;
|
|
if (regexec(Pat[0].pat, lp) == 0) {
|
|
/*
|
|
* Not conditional: - ! "^[.'](i[ef]|el)"
|
|
*/
|
|
cond = 1;
|
|
iflen = 0;
|
|
}
|
|
|
|
else if (regexec(Pat[2].pat, lp)) {
|
|
/*
|
|
* Argument count comparison: -
|
|
* "^[.']i[ef] !?\\n\(\.\$(>|>=|=|<|<=)[0-9] "
|
|
*/
|
|
iflen = strlen(".if \\n(.$=n ") + invert;
|
|
s1 = lp + iflen - 3;
|
|
op = *s1++;
|
|
if (*s1 == '=' && (op == '>' || op == '<')) {
|
|
s1++;
|
|
op = (op == '>') ? 'G' : 'L';
|
|
}
|
|
n1 = (int)(*s1 - '0');
|
|
switch (op) {
|
|
case '=':
|
|
if ((nargs - 1) == n1)
|
|
cond = 1;
|
|
break;
|
|
case '<':
|
|
if ((nargs - 1) < n1)
|
|
cond = 1;
|
|
break;
|
|
case '>':
|
|
if ((nargs - 1) > n1)
|
|
cond = 1;
|
|
break;
|
|
case 'G': /* >= */
|
|
if ((nargs - 1) >= n1)
|
|
cond = 1;
|
|
break;
|
|
case 'L': /* <= */
|
|
if ((nargs - 1) <= n1)
|
|
cond = 1;
|
|
}
|
|
}
|
|
|
|
else if (regexec(Pat[3].pat, lp)) {
|
|
/*
|
|
* Argument string comparison: - "^[.']i[ef] !?'\\\$[0-9]'[^']*' "
|
|
*/
|
|
iflen = strlen(".if '\\$n'") + invert;
|
|
n1 = (int)(*(lp + iflen - 2) - '0');
|
|
if (n1 >= 0 && n1 < nargs)
|
|
s1 = Args[n1];
|
|
else
|
|
s1 = (unsigned char *)"";
|
|
if ((s2 = (unsigned char *)strchr((char *)lp
|
|
+ iflen, '\''))
|
|
!= NULL) {
|
|
n2 = s2 - lp - iflen;
|
|
if (strncmp((char *)s1, (char *)lp + iflen, n2)
|
|
== 0)
|
|
cond = 1;
|
|
iflen += n2 + 2;
|
|
}
|
|
}
|
|
|
|
else if (regexec(Pat[4].pat, lp)) {
|
|
/*
|
|
* Nroff or troff: - "^[.']i[ef] !?[nt] "
|
|
*/
|
|
iflen = strlen(".if n ") + invert;
|
|
if (*(lp + iflen - 2) == 'n')
|
|
cond = 1;
|
|
}
|
|
|
|
else if ((*lp == '.' || *lp == '\'')
|
|
&& strncmp((char *)lp+1, "el ", 3) == 0) {
|
|
/*
|
|
* Else clause: - "^[.']el "
|
|
*/
|
|
cond = 1 - prevcond;
|
|
iflen = 4;
|
|
}
|
|
|
|
else {
|
|
/*
|
|
* Unknown conditional:
|
|
*/
|
|
cond = 1;
|
|
iflen = 0;
|
|
(void) sprintf((char *)buf,
|
|
".tm unknown .if/.ie form: %s", (char *)lp);
|
|
lp = buf;
|
|
}
|
|
/*
|
|
* Handle conditional. If case is true, locate predicate.
|
|
* If predicate is an .i[ef], process it.
|
|
*/
|
|
if (invert)
|
|
cond = 1 - cond;
|
|
if (cond && iflen > 0) {
|
|
lp += iflen;
|
|
if (regexec(Pat[15].pat, lp))
|
|
continue;
|
|
}
|
|
/*
|
|
* Do argument substitution, as necessary.
|
|
*/
|
|
if (cond && regexec(Pat[5].pat, lp)) { /* "\$[0-9]" ??? */
|
|
for (s1 = buf;;) {
|
|
if ((n1 = Pat[5].pat->startp[0] - lp) > 0) {
|
|
(void) strncpy((char *)s1, (char *)lp,
|
|
n1);
|
|
s1 += n1;
|
|
}
|
|
*s1 = '\0';
|
|
lp = Pat[5].pat->endp[0];
|
|
n1 = (int)(*(lp-1) - '0');
|
|
if (n1 >= 0 && n1 < nargs) {
|
|
(void) strcpy((char *)s1,
|
|
(char *)Args[n1]);
|
|
s1 += strlen((char *)Args[n1]);
|
|
}
|
|
if (*lp == '\0')
|
|
break;
|
|
if (regexec(Pat[5].pat, lp) == 0) {
|
|
(void) strcpy((char *)s1, (char *)lp);
|
|
break;
|
|
}
|
|
}
|
|
lp = buf;
|
|
}
|
|
/*
|
|
* Check for nroff command.
|
|
*/
|
|
if (cond) {
|
|
cmdl = 0;
|
|
if (cond && (*lp == '.' || *lp == '\'')) {
|
|
if ((*cmd = *(lp+1)) != '\0') {
|
|
cmdl++;
|
|
if ((*(cmd+1) = *(lp+2)) == ' ')
|
|
*(cmd+1) = '\0';
|
|
else
|
|
cmdl++;
|
|
}
|
|
}
|
|
cmd[cmdl] = '\0';
|
|
}
|
|
if (cond == 0)
|
|
i = i; /* do nothing if condition is false */
|
|
else if (cmdl == 0 || ((cmdx = Findmacro(cmd, 0)) < 0))
|
|
Pass2(lp);
|
|
else if (Sp >= MAXSP) {
|
|
(void) sprintf((char *)buf, " macro nesting > %d",
|
|
MAXSP);
|
|
Error(WARN, LINE, (char *)buf, NULL);
|
|
} else {
|
|
/*
|
|
* Stack macros.
|
|
*/
|
|
/*
|
|
* Push stack.
|
|
*/
|
|
Sp++;
|
|
Nleftstack[Sp] = nleft;
|
|
Ptrstack[Sp] = ptr;
|
|
Mxstack[Sp] = mx;
|
|
Condstack[Sp] = cond;
|
|
for (i = 10*Sp, j = 0; j < 10; i++, j++) {
|
|
Argstack[i] = Args[j];
|
|
Args[j] = NULL;
|
|
}
|
|
/*
|
|
* Start new stack entry.
|
|
*/
|
|
mx = cmdx;
|
|
ptr = Macrotab[mx].bx;
|
|
cond = 0;
|
|
nleft = Macrotab[mx].ct;
|
|
Args[0] = Newstr(cmd);
|
|
/*
|
|
* Parse arguments.
|
|
*/
|
|
for (s1 = lp + cmdl + 1, nargs = 1; nargs < 10;) {
|
|
while (*s1 && (*s1 == ' ' || *s1 == '\t'))
|
|
s1++;
|
|
if (*s1 == '\0')
|
|
break;
|
|
if (*s1 == '"') {
|
|
s1++;
|
|
quote = 1;
|
|
} else
|
|
quote = 0;
|
|
for (s2 = buf;;) {
|
|
if (!quote && (*s1 == ' ' || *s1 == '\t')) {
|
|
*s2 = '\0';
|
|
break;
|
|
}
|
|
if ((*s2 = *s1) == '\0')
|
|
break;
|
|
s1++;
|
|
if (quote && *s2 == '"') {
|
|
*s2 = '\0';
|
|
break;
|
|
}
|
|
s2++;
|
|
}
|
|
if (buf[0])
|
|
Args[nargs++] = Newstr(buf);
|
|
}
|
|
for (i = nargs; i < 10; i++) {
|
|
Args[i] = NULL;
|
|
}
|
|
}
|
|
/*
|
|
* Unstack completed macros.
|
|
*/
|
|
while (nleft <= 0 && Sp >= 0) {
|
|
nleft = Nleftstack[Sp];
|
|
mx = Mxstack[Sp];
|
|
ptr = Ptrstack[Sp];
|
|
cond = Condstack[Sp];
|
|
for (i = 10*Sp, j = 0, nargs = -1; j < 10; i++, j++) {
|
|
Free(&Args[j]);
|
|
if ((Args[j] = Argstack[i]) != NULL)
|
|
nargs = j;
|
|
}
|
|
Sp--;
|
|
nargs++;
|
|
}
|
|
/*
|
|
* Get next line.
|
|
*/
|
|
if (nleft > 0) {
|
|
lp = Macrotxt[ptr++];
|
|
nleft--;
|
|
} else
|
|
lp = (unsigned char *)"";
|
|
}
|
|
(void) sprintf((char *)buf, ".^# %d %s", NR, (char *)Inname);
|
|
Pass2(buf);
|
|
}
|