ref: 47ec5de29e56c4cf223e0582b930b88ca2a589ee
dir: /sys/src/cmd/eqn/main.c/
#include "e.h"
#include <errno.h>
#define MAXLINE 3600 /* maximum input line */
char *version = "version Oct 24, 1991";
char in[MAXLINE+1]; /* input buffer */
int noeqn;
char *cmdname;
int yyparse(void);
void settype(char *);
int getdata(void);
int getline(char *);
void inlineeq(void);
void init(void);
void init_tbl(void);
void
main(int argc, char *argv[])
{
char *p, buf[20];
cmdname = argv[0];
if (p = getenv("TYPESETTER"))
typesetter = p;
while (argc > 1 && argv[1][0] == '-') {
switch (argv[1][1]) {
case 'd':
if (argv[1][2] == '\0') {
dbg++;
printf("...\teqn %s\n", version);
} else {
lefteq = argv[1][2];
righteq = argv[1][3];
}
break;
case 's': szstack[0] = gsize = atoi(&argv[1][2]); break;
case 'p': deltaps = atoi(&argv[1][2]); dps_set = 1; break;
case 'm': minsize = atoi(&argv[1][2]); break;
case 'f': strcpy(ftstack[0].name,&argv[1][2]); break;
case 'e': noeqn++; break;
case 'T': typesetter = &argv[1][2]; break;
default:
fprintf(stderr, "%s: unknown option %s\n", cmdname, argv[1]);
break;
}
argc--;
argv++;
}
settype(typesetter);
sprintf(buf, "\"%s\"", typesetter);
install(deftbl, strsave(typesetter), strsave(buf), 0);
init_tbl(); /* install other keywords in tables */
curfile = infile;
pushsrc(File, curfile->fname);
if (argc <= 1) {
curfile->fin = stdin;
curfile->fname = strsave("-");
getdata();
} else
while (argc-- > 1) {
if (strcmp(*++argv, "-") == 0)
curfile->fin = stdin;
else if ((curfile->fin = fopen(*argv, "r")) == NULL)
ERROR "can't open file %s", *argv FATAL;
curfile->fname = strsave(*argv);
getdata();
if (curfile->fin != stdin)
fclose(curfile->fin);
}
exit(0);
}
void settype(char *s) /* initialize data for particular typesetter */
/* the minsize could profitably come from the */
{ /* troff description file /usr/lib/font/dev.../DESC.out */
if (strcmp(s, "202") == 0)
{ minsize = 5; ttype = DEV202; }
else if (strcmp(s, "aps") == 0)
{ minsize = 5; ttype = DEVAPS; }
else if (strcmp(s, "cat") == 0)
{ minsize = 6; ttype = DEVCAT; }
else if (strcmp(s, "post") == 0)
{ minsize = 4; ttype = DEVPOST; }
else
{ minsize = 5; ttype = DEV202; }
}
getdata(void)
{
int i, type, ln;
char fname[100];
errno = 0;
curfile->lineno = 0;
printf(".lf 1 %s\n", curfile->fname);
while ((type = getline(in)) != EOF) {
if (in[0] == '.' && in[1] == 'E' && in[2] == 'Q') {
for (i = 11; i < 100; i++)
used[i] = 0;
printf("%s", in);
if (markline) { /* turn off from last time */
printf(".nr MK 0\n");
markline = 0;
}
display = 1;
init();
yyparse();
if (eqnreg > 0) {
if (markline)
printf(".nr MK %d\n", markline); /* for -ms macros */
printf(".if %gm>\\n(.v .ne %gm\n", eqnht, eqnht);
printf(".rn %d 10\n", eqnreg);
if (!noeqn)
printf("\\&\\*(10\n");
}
printf(".EN");
while (putchar(input()) != '\n')
;
printf(".lf %d\n", curfile->lineno+1);
}
else if (type == lefteq)
inlineeq();
else if (in[0] == '.' && in[1] == 'l' && in[2] == 'f') {
if (sscanf(in+3, "%d %s", &ln, fname) == 2) {
free(curfile->fname);
printf(".lf %d %s\n", curfile->lineno = ln, curfile->fname = strsave(fname));
} else
printf(".lf %d\n", curfile->lineno = ln);
} else
printf("%s", in);
}
return(0);
}
getline(char *s)
{
register c;
while ((c=input()) != '\n' && c != EOF && c != lefteq) {
if (s >= in+MAXLINE) {
ERROR "input line too long: %.20s\n", in WARNING;
in[MAXLINE] = '\0';
break;
}
*s++ = c;
}
if (c != lefteq)
*s++ = c;
*s = '\0';
return(c);
}
void inlineeq(void)
{
int ds, n, sz1 = 0;
n = curfile->lineno;
if (szstack[0] != 0)
printf(".nr %d \\n(.s\n", sz1 = salloc());
ds = salloc();
printf(".rm %d \n", ds);
display = 0;
do {
if (*in)
printf(".as %d \"%s\n", ds, in);
init();
yyparse();
if (eqnreg > 0) {
printf(".as %d \\*(%d\n", ds, eqnreg);
sfree(eqnreg);
printf(".lf %d\n", curfile->lineno+1);
}
} while (getline(in) == lefteq);
if (*in)
printf(".as %d \"%s", ds, in);
if (sz1)
printf("\\s\\n(%d", sz1);
printf("\\*(%d\n", ds);
printf(".lf %d\n", curfile->lineno+1);
if (curfile->lineno > n+3)
fprintf(stderr, "eqn warning: multi-line %c...%c, file %s:%d,%d\n",
lefteq, righteq, curfile->fname, n, curfile->lineno);
sfree(ds);
if (sz1) sfree(sz1);
}
void putout(int p1)
{
double before, after;
extern double BeforeSub, AfterSub;
dprintf(".\tanswer <- S%d, h=%g,b=%g\n",p1, eht[p1], ebase[p1]);
eqnht = eht[p1];
before = eht[p1] - ebase[p1] - BeforeSub; /* leave room for sub or superscript */
after = ebase[p1] - AfterSub;
if (spaceval || before > 0.01 || after > 0.01) {
printf(".ds %d ", p1); /* used to be \\x'0' here: why? */
if (spaceval != NULL)
printf("\\x'0-%s'", spaceval);
else if (before > 0.01)
printf("\\x'0-%gm'", before);
printf("\\*(%d", p1);
if (spaceval == NULL && after > 0.01)
printf("\\x'%gm'", after);
putchar('\n');
}
if (szstack[0] != 0)
printf(".ds %d %s\\*(%d\\s\\n(99\n", p1, DPS(gsize,gsize), p1);
eqnreg = p1;
if (spaceval != NULL) {
free(spaceval);
spaceval = NULL;
}
}
void init(void)
{
synerr = 0;
ct = 0;
ps = gsize;
ftp = ftstack;
ft = ftp->ft;
nszstack = 0;
if (szstack[0] != 0) /* absolute gsize in effect */
printf(".nr 99 \\n(.s\n");
}
salloc(void)
{
int i;
for (i = 11; i < 100; i++)
if (used[i] == 0) {
used[i]++;
return(i);
}
ERROR "no eqn strings left (%d)", i FATAL;
return(0);
}
void sfree(int n)
{
used[n] = 0;
}
void nrwid(int n1, int p, int n2)
{
printf(".nr %d 0\\w'%s\\*(%d'\n", n1, DPS(gsize,p), n2); /* 0 defends against - width */
}
char *ABSPS(int dn) /* absolute size dn in printable form \sd or \s(dd (dd >= 40) */
{
static char buf[100], *lb = buf;
char *p;
if (lb > buf + sizeof(buf) - 10)
lb = buf;
p = lb;
*lb++ = '\\';
*lb++ = 's';
if (dn >= 10) { /* \s(dd only works in new troff */
if (dn >= 40)
*lb++ = '(';
*lb++ = dn/10 + '0';
*lb++ = dn%10 + '0';
} else {
*lb++ = dn + '0';
}
*lb++ = '\0';
return p;
}
char *DPS(int f, int t) /* delta ps (t-f) in printable form \s+d or \s-d or \s+-(dd */
{
static char buf[100], *lb = buf;
char *p;
int dn;
if (lb > buf + sizeof(buf) - 10)
lb = buf;
p = lb;
*lb++ = '\\';
*lb++ = 's';
dn = EFFPS(t) - EFFPS(f);
if (szstack[nszstack] != 0) /* absolute */
dn = EFFPS(t); /* should do proper \s(dd */
else if (dn >= 0)
*lb++ = '+';
else {
*lb++ = '-';
dn = -dn;
}
if (dn >= 10) { /* \s+(dd only works in new troff */
*lb++ = '(';
*lb++ = dn/10 + '0';
*lb++ = dn%10 + '0';
} else {
*lb++ = dn + '0';
}
*lb++ = '\0';
return p;
}
EFFPS(int n) /* effective value of n */
{
if (n >= minsize)
return n;
else
return minsize;
}
double EM(double m, int ps) /* convert m to ems in gsize */
{
m *= (double) EFFPS(ps) / gsize;
if (m <= 0.001 && m >= -0.001)
return 0;
else
return m;
}
double REL(double m, int ps) /* convert m to ems in ps */
{
m *= (double) gsize / EFFPS(ps);
if (m <= 0.001 && m >= -0.001)
return 0;
else
return m;
}