843 lines
20 KiB
C
843 lines
20 KiB
C
/*
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* pass2.c - cawf(1) pass 2 function
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*/
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/*
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* Copyright (c) 1991 Purdue University Research Foundation,
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* West Lafayette, Indiana 47907. All rights reserved.
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*
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* Written by Victor A. Abell <abe@mace.cc.purdue.edu>, Purdue
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* University Computing Center. Not derived from licensed software;
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* derived from awf(1) by Henry Spencer of the University of Toronto.
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*
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* Permission is granted to anyone to use this software for any
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* purpose on any computer system, and to alter it and redistribute
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* it freely, subject to the following restrictions:
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*
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* 1. The author is not responsible for any consequences of use of
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* this software, even if they arise from flaws in it.
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*
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* 2. The origin of this software must not be misrepresented, either
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* by explicit claim or by omission. Credits must appear in the
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* documentation.
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*
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* 3. Altered versions must be plainly marked as such, and must not
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* be misrepresented as being the original software. Credits must
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* appear in the documentation.
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*
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* 4. This notice may not be removed or altered.
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*/
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#include "cawf.h"
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#include <ctype.h>
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/*
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* Pass2(line) - process the nroff requests in a line and break
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* text into words for pass 3
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*/
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void
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Pass2(line)
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unsigned char *line;
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{
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int brk; /* request break status */
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unsigned char buf[MAXLINE]; /* working buffer */
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unsigned char c; /* character buffer */
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double d; /* temporary double */
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double exscale; /* expression scaling factor */
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double expr[MAXEXP]; /* expressions */
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unsigned char exsign[MAXEXP]; /* expression signs */
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int i, j; /* temporary indexes */
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int inword; /* word processing status */
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int nexpr; /* number of expressions */
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unsigned char nm[4], nm1[4]; /* names */
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int nsp; /* number of spaces */
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unsigned char op; /* expression term operator */
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unsigned char opstack[MAXSP]; /* expression operation stack */
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unsigned char period; /* end of word status */
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unsigned char *s1, *s2, *s3; /* temporary string pointers */
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double sexpr[MAXEXP]; /* signed expressions */
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int sp; /* expression stack pointer */
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unsigned char ssign; /* expression's starting sign */
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int tabpos; /* tab position */
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double tscale; /* term scaling factor */
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double tval; /* term value */
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double val; /* term value */
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double valstack[MAXSP]; /* expression value stack */
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unsigned char xbuf[MAXLINE]; /* expansion buffer */
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if (line == NULL) {
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/*
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* End of macro expansion.
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*/
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Pass3(DOBREAK, (unsigned char *)"need", NULL, 999);
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return;
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}
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/*
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* Adjust line number.
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*/
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if (Lockil == 0)
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P2il++;
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/*
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* Empty line - "^[ \t]*$" or "^\\\"".
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*/
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if (regexec(Pat[6].pat, line)
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|| strncmp((char *)line, "\\\"", 2) == 0) {
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Pass3(DOBREAK, (unsigned char *)"space", NULL, 0);
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return;
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}
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/*
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* Line begins with white space.
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*/
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if (*line == ' ' || *line == '\t') {
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Pass3(DOBREAK, (unsigned char *)"flush", NULL, 0);
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Pass3(0, (unsigned char *)"", NULL, 0);
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}
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if (*line != '.' && *line != '\'') {
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/*
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* Line contains text (not an nroff request).
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*/
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if (Font[0] == 'R' && Backc == 0 && Aftnxt == NULL
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&& regexec(Pat[7].pat, line) == 0) {
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/*
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* The font is Roman, there is no "\\c" or "after next"
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* trap pending and and the line has no '\\', '\t', '-',
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* or " " (regular expression "\\|\t|-| ").
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*
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* Output each word of the line as "<length> <word>".
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*/
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for (s1 = line;;) {
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while (*s1 && *s1 == ' ')
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s1++;
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if (*s1 == '\0')
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break;
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for (s2 = s1, s3 = buf; *s2 && *s2 != ' ';)
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*s3++ = Trtbl[(int)*s2++];
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*s3 = '\0';
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Pass3((s2 - s1), buf, NULL, 0);
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s1 = *s2 ? ++s2 : s2;
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}
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/*
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* Line terminates with punctuation and optional
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* bracketing (regular expression "[.!?:][\])'\"*]*$").
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*/
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if (regexec(Pat[8].pat, line))
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Pass3(NOBREAK, (unsigned char *)"gap", NULL, 2);
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if (Centering > 0) {
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Pass3(DOBREAK,(unsigned char *)"center", NULL,
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0);
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Centering--;
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} else if (Fill == 0)
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Pass3(DOBREAK, (unsigned char *)"flush", NULL,
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0);
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return;
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}
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/*
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* Line must be scanned a character at a time.
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*/
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inword = nsp = tabpos = 0;
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period = '\0';
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for (s1 = line;; s1++) {
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/*
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* Space or TAB causes state transition.
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*/
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if (*s1 == '\0' || *s1 == ' ' || *s1 == '\t') {
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if (inword) {
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if (!Backc) {
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Endword();
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Pass3(Wordl, Word, NULL, 0);
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if (Uhyph) {
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Pass3(NOBREAK,
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(unsigned char *)"nohyphen",
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NULL, 0);
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}
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}
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inword = 0;
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nsp = 0;
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}
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if (*s1 == '\0')
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break;
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} else {
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if (inword == 0) {
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if (Backc == 0) {
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Wordl = Wordx = 0;
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Uhyph = 0;
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}
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Backc = 0;
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inword = 1;
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if (nsp > 1) {
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Pass3(NOBREAK,
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(unsigned char *)"gap",
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NULL, nsp);
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}
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}
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}
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/*
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* Process a character.
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*/
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switch (*s1) {
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/*
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* Space
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*/
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case ' ':
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nsp++;
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period = '\0';
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break;
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/*
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* TAB
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*/
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case '\t':
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tabpos++;
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if (tabpos <= Ntabs) {
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Pass3(NOBREAK,
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(unsigned char *)"tabto", NULL,
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Tabs[tabpos-1]);
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}
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nsp = 0;
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period = '\0';
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break;
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/*
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* Hyphen if word is being assembled
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*/
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case '-':
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if (Wordl <= 0)
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goto ordinary_char;
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if ((i = Findhy(NULL, 0, 0)) < 0) {
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Error(WARN, LINE, " no hyphen for font ",
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(char *)Font);
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return;
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}
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Endword();
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Pass3(Wordl, Word, NULL, Hychar[i].len);
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Pass3(NOBREAK, (unsigned char *)"userhyphen",
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Hychar[i].str, Hychar[i].len);
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Wordl = Wordx = 0;
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period = '\0';
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Uhyph = 1;
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break;
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/*
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* Backslash
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*/
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case '\\':
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s1++;
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switch(*s1) {
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/*
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* Comment - "\\\""
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*/
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case '"':
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while (*(s1+1))
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s1++;
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break;
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/*
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* Change font - "\\fN"
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*/
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case 'f':
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s1 = Asmcode(&s1, nm);
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if (nm[0] == 'P') {
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Font[0] = Prevfont;
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break;
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}
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for (i = 0; Fcode[i].nm; i++) {
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if (Fcode[i].nm == nm[0])
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break;
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}
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if (Fcode[i].nm == '\0'
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|| nm[1] != '\0') {
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Error(WARN, LINE, " unknown font ",
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(char *)nm);
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break;
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}
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if (Fcode[i].status != '1') {
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Error(WARN, LINE,
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" font undefined ", (char *)nm);
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break;
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} else {
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Prevfont = Font[0];
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Font[0] = nm[0];
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}
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break;
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/*
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* Positive horizontal motion - "\\h\\n(NN" or
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* "\\h\\nN"
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*/
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case 'h':
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if (s1[1] != '\\' || s1[2] != 'n') {
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Error(WARN, LINE,
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" no \\n after \\h", NULL);
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break;
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}
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s1 +=2;
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s1 = Asmcode(&s1, nm);
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if ((i = Findnum(nm, 0, 0)) < 0)
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goto unknown_num;
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if ((j = Numb[i].val) < 0) {
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Error(WARN, LINE, " \\h < 0 ",
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NULL);
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break;
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}
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if (j == 0)
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break;
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if ((strlen((char *)s1+1) + j + 1)
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>= MAXLINE)
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goto line_too_long;
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for (s2 = &xbuf[1]; j; j--)
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*s2++ = ' ';
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(void) strcpy((char *)s2, (char *)s1+1);
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s1 = xbuf;
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break;
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/*
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* Save current position in register if "\\k<reg>"
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*/
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case 'k':
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s1 = Asmcode(&s1, nm);
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if ((i = Findnum(nm, 0, 0)) < 0)
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i = Findnum(nm, 0, 1);
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Numb[i].val =
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(int)((double)Outll * Scalen);
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break;
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/*
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* Interpolate number - "\\n(NN" or "\\nN"
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*/
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case 'n':
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s1 = Asmcode(&s1, nm);
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if ((i = Findnum(nm, 0, 0)) < 0) {
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unknown_num:
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Error(WARN, LINE,
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" unknown number register ",
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(char *)nm);
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break;
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}
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(void) sprintf((char *)buf, "%d",
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Numb[i].val);
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if ((strlen((char *)buf)
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+ strlen((char *)s1+1) + 1)
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>= MAXLINE) {
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line_too_long:
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Error(WARN, LINE, " line too long",
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NULL);
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break;
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}
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(void) sprintf((char *)buf, "%d%s",
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Numb[i].val, (char *)s1+1);
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(void) strcpy((char *)&xbuf[1],
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(char *)buf);
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s1 = xbuf;
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break;
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/*
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* Change size - "\\s[+-][0-9]" - NOP
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*/
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case 's':
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s1++;
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if (*s1 == '+' || *s1 == '-')
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s1++;
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while (*s1 && isdigit(*s1))
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s1++;
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s1--;
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break;
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/*
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* Continue - "\\c"
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*/
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case 'c':
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Backc = 1;
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break;
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/*
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* Interpolate string - "\\*(NN" or "\\*N"
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*/
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case '*':
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s1 = Asmcode(&s1, nm);
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s2 = Findstr(nm, NULL, 0);
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if (*s2 != '\0') {
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if ((strlen((char *)s2)
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+ strlen((char *)s1+1) + 1)
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>= MAXLINE)
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goto line_too_long;
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(void) sprintf((char *)buf, "%s%s",
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(char *)s2, (char *)s1+1);
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(void) strcpy((char *)&xbuf[1],
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(char *)buf);
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s1 = xbuf;
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}
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break;
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/*
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* Discretionary hyphen - "\\%"
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*/
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case '%':
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if (Wordl <= 0)
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break;
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if ((i = Findhy(NULL, 0, 0)) < 0) {
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Error(WARN, LINE,
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" no hyphen for font ",
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(char *)Font);
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break;
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}
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Endword();
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Pass3(Wordl, Word, NULL, Hychar[i].len);
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Pass3(NOBREAK,
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(unsigned char *) "hyphen",
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Hychar[i].str, Hychar[i].len);
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Wordl = Wordx = 0;
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Uhyph = 1;
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break;
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/*
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* None of the above - may be special character
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* name.
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*/
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default:
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s2 = s1--;
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s1 = Asmcode(&s1, nm);
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if ((i = Findchar(nm, 0, NULL, 0)) < 0){
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s1 = s2;
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goto ordinary_char;
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}
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if (strcmp((char *)nm, "em") == 0
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&& Wordx > 0) {
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/*
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* "\\(em" is a special case when a word
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* has been assembled, because of
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* hyphenation.
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*/
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Endword();
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Pass3(Wordl, Word, NULL,
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Schar[i].len);
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Pass3(NOBREAK,
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(unsigned char *)"userhyphen",
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Schar[i].str, Schar[i].len);
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Wordl = Wordx = 0;
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period = '\0';
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Uhyph = 1;
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}
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/*
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* Interpolate a special character
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*/
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if (Str2word(Schar[i].str,
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strlen((char *)Schar[i].str)) != 0)
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return;
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Wordl += Schar[i].len;
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period = '\0';
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}
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break;
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/*
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* Ordinary character
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*/
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default:
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ordinary_char:
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if (Str2word(s1, 1) != 0)
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return;
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Wordl++;
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if (*s1 == '.' || *s1 == '!'
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|| *s1 == '?' || *s1 == ':')
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period = '.';
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else if (period == '.') {
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nm[0] = *s1;
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nm[1] = '\0';
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if (regexec(Pat[13].pat, nm) == 0)
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period = '\0';
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}
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}
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}
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/*
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* End of line processing
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*/
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if (!Backc) {
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if (period == '.')
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Pass3(NOBREAK, (unsigned char *)"gap", NULL, 2);
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if (Centering > 0) {
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Pass3(DOBREAK, (unsigned char *)"center", NULL,
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0);
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Centering--;
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} else if (!Fill)
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Pass3(DOBREAK, (unsigned char *)"flush", NULL,
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0);
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}
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if (Aftnxt == NULL)
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return;
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/* else fall through to process an "after next trap */
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}
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/*
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* Special -man macro handling.
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*/
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if (Marg == MANMACROS) {
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/*
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* A text line - "^[^.]" - is only processed when there is an
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* "after next" directive.
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*/
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if (*line != '.' && *line != '\'') {
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if (Aftnxt != NULL) {
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if (regexec(Pat[9].pat, Aftnxt)) /* ",fP" */
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Font[0] = Prevfont;
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if (regexec(Pat[16].pat, Aftnxt)) /* ",fR" */
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Font[0] = 'R';
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if (regexec(Pat[10].pat, Aftnxt)) /* ",tP" */
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Pass3(DOBREAK,
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(unsigned char *)"toindent",
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NULL, 0);
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Free(&Aftnxt);
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}
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return;
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}
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/*
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* Special footer handling - "^.lF"
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*/
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if (line[1] == 'l' && line[2] == 'F') {
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s1 = Findstr((unsigned char *)"by", NULL, 0);
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s2 = Findstr((unsigned char *)"nb", NULL, 0);
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if (*s1 == '\0' || *s2 == '\0')
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(void) sprintf((char *)buf, "%s%s",
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(char *)s1, (char *)s2);
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else
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(void) sprintf((char *)buf, "%s; %s",
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(char *)s1, (char *)s2);
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Pass3(NOBREAK, (unsigned char *)"LF", buf, 0);
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return;
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}
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}
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/*
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* Special -ms macro handling.
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*/
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if (Marg == MSMACROS) {
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/*
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* A text line - "^[^.]" - is only processed when there is an
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* "after next" directive.
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*/
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if (*line != '.' && *line != '\'') {
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if (Aftnxt != NULL) {
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if (regexec(Pat[10].pat, Aftnxt)) /* ",tP" */
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Pass3(DOBREAK,
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(unsigned char *)"toindent",
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NULL, 0);
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Free(&Aftnxt);
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}
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return;
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}
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/*
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* Numbered headings - "^[.']nH"
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*/
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if (line[1] == 'n' && line[2] == 'H') {
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s1 = Field(2, line, 0);
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if (s1 != NULL) {
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i = atoi((char *)s1) - 1;
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if (i < 0) {
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for (j = 0; j < MAXNHNR; j++) {
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Nhnr[j] = 0;
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}
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i = 0;
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} else if (i >= MAXNHNR) {
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(void) sprintf((char *)buf,
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" over NH limit (%d)", MAXNHNR);
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Error(WARN, LINE, (char *)buf, NULL);
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}
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} else
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i = 0;
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Nhnr[i]++;
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for (j = i + 1; j < MAXNHNR; j++) {
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Nhnr[j] = 0;
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}
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s1 = buf;
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for (j = 0; j <= i; j++) {
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(void) sprintf((char *)s1, "%d.", Nhnr[j]);
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s1 = buf + strlen((char *)buf);
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}
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(void) Findstr((unsigned char *)"Nh", buf, 1);
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return;
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}
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}
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/*
|
|
* Remaining lines should begin with a '.' or '\'' unless an "after next"
|
|
* trap has failed.
|
|
*/
|
|
if (*line != '.' && *line != '\'') {
|
|
if (Aftnxt != NULL)
|
|
Error(WARN, LINE, " failed .it: ", (char *)Aftnxt);
|
|
else
|
|
Error(WARN, LINE, " unrecognized line ", NULL);
|
|
return;
|
|
}
|
|
brk = (*line == '.') ? DOBREAK : NOBREAK;
|
|
/*
|
|
* Evaluate expressions for "^[.'](ta|ll|ls|in|ti|po|ne|sp|pl|nr)"
|
|
* Then process the requests.
|
|
*/
|
|
if (regexec(Pat[11].pat, &line[1])) {
|
|
/*
|
|
* Establish default scale factor.
|
|
*/
|
|
if ((line[1] == 'n' && line[2] == 'e')
|
|
|| (line[1] == 's' && line[2] == 'p')
|
|
|| (line[1] == 'p' && line[2] == 'l'))
|
|
exscale = Scalev;
|
|
else if (line[1] == 'n' && line[2] == 'r')
|
|
exscale = Scaleu;
|
|
else
|
|
exscale = Scalen;
|
|
/*
|
|
* Determine starting argument.
|
|
*/
|
|
if (line[1] == 'n' && line[2] == 'r')
|
|
s1 = Field(2, &line[3], 0);
|
|
else
|
|
s1 = Field(1, &line[3], 0);
|
|
/*
|
|
* Evaluate expressions.
|
|
*/
|
|
for (nexpr = 0; s1 != NULL &&*s1 != '\0'; ) {
|
|
while (*s1 == ' ' || *s1 == '\t')
|
|
s1++;
|
|
if (*s1 == '+' || *s1 == '-')
|
|
ssign = *s1++;
|
|
else
|
|
ssign = '\0';
|
|
/*
|
|
* Process terms.
|
|
*/
|
|
val = 0.0;
|
|
sp = -1;
|
|
c = '+';
|
|
s1--;
|
|
while (c == '+' || c == '*' || c == '%'
|
|
|| c == ')' || c == '-' || c == '/') {
|
|
op = c;
|
|
s1++;
|
|
tscale = exscale;
|
|
tval = 0.0;
|
|
/*
|
|
* Pop stack on right parenthesis.
|
|
*/
|
|
if (op == ')') {
|
|
tval = val;
|
|
if (sp >= 0) {
|
|
val = valstack[sp];
|
|
op = opstack[sp];
|
|
sp--;
|
|
} else {
|
|
Error(WARN, LINE,
|
|
" expression stack underflow", NULL);
|
|
return;
|
|
}
|
|
tscale = Scaleu;
|
|
/*
|
|
* Push stack on left parenthesis.
|
|
*/
|
|
} else if (*s1 == '(') {
|
|
sp++;
|
|
if (sp >= MAXSP) {
|
|
Error(WARN, LINE,
|
|
" expression stack overflow", NULL);
|
|
return;
|
|
}
|
|
valstack[sp] = val;
|
|
opstack[sp] = op;
|
|
val = 0.0;
|
|
c = '+';
|
|
continue;
|
|
} else if (*s1 == '\\') {
|
|
s1++;
|
|
switch(*s1) {
|
|
/*
|
|
* "\\"" begins a comment.
|
|
*/
|
|
case '"':
|
|
while (*s1)
|
|
s1++;
|
|
break;
|
|
/*
|
|
* Crude width calculation for "\\w"
|
|
*/
|
|
case 'w':
|
|
s2 = ++s1;
|
|
if (*s1) {
|
|
s1++;
|
|
while (*s1 && *s1 != *s2)
|
|
s1++;
|
|
tval = (double) (s1 - s2 - 1) * Scalen;
|
|
if (*s1)
|
|
s1++;
|
|
}
|
|
break;
|
|
/*
|
|
* Interpolate number register if "\\n".
|
|
*/
|
|
case 'n':
|
|
s1 = Asmcode(&s1, nm);
|
|
if ((i = Findnum(nm, 0, 0)) >= 0)
|
|
tval = Numb[i].val;
|
|
s1++;
|
|
}
|
|
/*
|
|
* Assemble numeric value.
|
|
*/
|
|
} else if (*s1 == '.' || isdigit(*s1)) {
|
|
for (i = 0; isdigit(*s1) || *s1 == '.'; s1++) {
|
|
if (*s1 == '.') {
|
|
i = 10;
|
|
continue;
|
|
}
|
|
d = (double) (*s1 - '0');
|
|
if (i) {
|
|
tval = tval + (d / (double) i);
|
|
i = i * 10;
|
|
} else
|
|
tval = (tval * 10.0) + d;
|
|
}
|
|
} else {
|
|
/*
|
|
* It's not an expression. Ignore extra scale.
|
|
*/
|
|
if ((i = Findscale((int)*s1, 0.0, 0)) < 0) {
|
|
(void) sprintf((char *)buf,
|
|
" \"%s\" isn't an expression",
|
|
(char *)s1);
|
|
Error(WARN, LINE, (char *)buf, NULL);
|
|
}
|
|
s1++;
|
|
}
|
|
/*
|
|
* Add term to expression value.
|
|
*/
|
|
if ((i = Findscale((int)*s1, 0.0, 0)) >= 0) {
|
|
tval *= Scale[i].val;
|
|
s1++;
|
|
} else
|
|
tval *= tscale;
|
|
switch (op) {
|
|
case '+':
|
|
val += tval;
|
|
break;
|
|
case '-':
|
|
val -= tval;
|
|
break;
|
|
case '*':
|
|
val *= tval;
|
|
break;
|
|
case '/':
|
|
case '%':
|
|
i = (int) val;
|
|
j = (int) tval;
|
|
if (j == 0) {
|
|
Error(WARN, LINE,
|
|
(*s1 == '/') ? "div" : "mod",
|
|
" by 0");
|
|
return;
|
|
}
|
|
if (op == '/')
|
|
val = (double) (i / j);
|
|
else
|
|
val = (double) (i % j);
|
|
break;
|
|
}
|
|
c = *s1;
|
|
}
|
|
/*
|
|
* Save expression value and sign.
|
|
*/
|
|
if (nexpr >= MAXEXP) {
|
|
(void) sprintf((char *)buf,
|
|
" at expression limit of %d", MAXEXP);
|
|
Error(WARN, LINE, (char *)buf, NULL);
|
|
return;
|
|
}
|
|
exsign[nexpr] = ssign;
|
|
expr[nexpr] = val;
|
|
if (ssign == '-')
|
|
sexpr[nexpr] = -1.0 * val;
|
|
else
|
|
sexpr[nexpr] = val;
|
|
nexpr++;
|
|
while (*s1 == ' ' || *s1 == '\t')
|
|
s1++;
|
|
}
|
|
/*
|
|
* Set parameters "(ll|ls|in|ti|po|pl)"
|
|
*/
|
|
if (regexec(Pat[12].pat, &line[1])) {
|
|
nm[0] = line[1];
|
|
nm[1] = line[2];
|
|
if ((i = Findparms(nm)) < 0) {
|
|
Error(WARN, LINE,
|
|
" can't find parameter register ",
|
|
(char *)nm);
|
|
return;
|
|
}
|
|
if (nexpr == 0 || exscale == 0.0)
|
|
j = Parms[i].prev;
|
|
else if (exsign[0] == '\0'
|
|
|| (nm[0] == 't' && nm[1] == 'i'))
|
|
j = (int)(sexpr[0] / exscale);
|
|
else
|
|
j = Parms[i].val + (int)(sexpr[0] / exscale);
|
|
Parms[i].prev = Parms[i].val;
|
|
Parms[i].val = j;
|
|
nm[0] = (nexpr) ? exsign[0] : '\0'; /* for .ti */
|
|
nm[1] = '\0';
|
|
Pass3(brk, (unsigned char *)Parms[i].cmd, nm, j);
|
|
return;
|
|
}
|
|
if (line[1] == 'n') {
|
|
switch(line[2]) {
|
|
/*
|
|
* Need - "^[.']ne <expression>"
|
|
*/
|
|
case 'e':
|
|
if (nexpr && Scalev > 0.0)
|
|
i = (int) ((expr[0]/Scalev) + 0.99);
|
|
else
|
|
i = 0;
|
|
Pass3(DOBREAK, (unsigned char *)"need", NULL,
|
|
i);
|
|
return;
|
|
/*
|
|
* Number - "^[.']nr <name> <expression>"
|
|
*/
|
|
case 'r':
|
|
if ((s1 = Field(2, line, 0)) == NULL) {
|
|
Error(WARN, LINE, " bad number register",
|
|
NULL);
|
|
return;
|
|
}
|
|
if ((i = Findnum(s1, 0, 0)) < 0)
|
|
i = Findnum(s1, 0, 1);
|
|
if (nexpr < 1) {
|
|
Numb[i].val = 0;
|
|
return;
|
|
}
|
|
if (exsign[0] == '\0')
|
|
Numb[i].val = (int) expr[0];
|
|
else
|
|
Numb[i].val += (int) sexpr[0];
|
|
return;
|
|
}
|
|
}
|
|
/*
|
|
* Space - "^[.']sp <expression>"
|
|
*/
|
|
if (line[1] == 's' && line[2] == 'p') {
|
|
if (nexpr == 0)
|
|
i = 1;
|
|
else
|
|
i = (int)((expr[0] / Scalev) + 0.99);
|
|
while (i--)
|
|
Pass3(brk, (unsigned char *)"space", NULL, 0);
|
|
return;
|
|
}
|
|
/*
|
|
* Tab positions - "^[.']ta <pos1> <pos2> . . ."
|
|
*/
|
|
if (line[1] == 't' && line[2] == 'a') {
|
|
tval = 0.0;
|
|
for (j = 0; j < nexpr; j++) {
|
|
if (exsign[j] == '\0')
|
|
tval = expr[j];
|
|
else
|
|
tval += sexpr[j];
|
|
Tabs[j] = (int) (tval / Scalen);
|
|
}
|
|
Ntabs = nexpr;
|
|
return;
|
|
}
|
|
}
|
|
/*
|
|
* Process all other nroff requests via Nreq().
|
|
*/
|
|
(void) Nreq(line, brk);
|
|
return;
|
|
}
|