ref: 4e1e04ac903989a6973d5b9c4df1821f0e1d9366
dir: /post.c/
/*
* neatpost troff postscript postprocessor
*
* Copyright (C) 2013-2014 Ali Gholami Rudi <ali at rudi dot ir>
*
* This program is released under the Modified BSD license.
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "post.h"
static int ps_pagewidth = 2159; /* page width (tenths of a millimetre) */
static int ps_pageheight = 2794;/* page height (tenths of a millimetre) */
static int ps_linewidth = 40; /* drawing line thickness in thousandths of an em */
static int o_pages; /* output pages */
static int next(void)
{
return getc(stdin);
}
static void back(int c)
{
ungetc(c, stdin);
}
static int utf8len(int c)
{
if (c <= 0x7f)
return 1;
if (c >= 0xfc)
return 6;
if (c >= 0xf8)
return 5;
if (c >= 0xf0)
return 4;
if (c >= 0xe0)
return 3;
if (c >= 0xc0)
return 2;
return 1;
}
static int nextutf8(char *s)
{
int c = next();
int l = utf8len(c);
int i;
if (c < 0)
return 0;
s[0] = c;
for (i = 1; i < l; i++)
s[i] = next();
s[l] = '\0';
return l;
}
/* skip blanks */
static void nextskip(void)
{
int c;
do {
c = next();
} while (isspace(c));
back(c);
}
static int nextnum(void)
{
int c;
int n = 0;
int neg = 0;
nextskip();
while (1) {
c = next();
if (!n && c == '-') {
neg = 1;
continue;
}
if (!isdigit(c))
back(c);
if (c < 0 || !isdigit(c))
break;
n = n * 10 + c - '0';
}
return neg ? -n : n;
}
static int iseol(void)
{
int c;
do {
c = next();
} while (c == ' ');
back(c);
return c == '\n';
}
/* skip until the end of line */
static void nexteol(void)
{
int c;
do {
c = next();
} while (c >= 0 && c != '\n');
}
static void nextword(char *s)
{
int c;
nextskip();
c = next();
while (c >= 0 && !isspace(c)) {
*s++ = c;
c = next();
}
if (c >= 0)
back(c);
*s = '\0';
}
/* read until eol */
static void readln(char *s)
{
int c;
c = next();
while (c > 0 && c != '\n') {
*s++ = c;
c = next();
}
if (c == '\n')
back(c);
*s = '\0';
}
static void postline(void)
{
int h, v;
while (!iseol()) {
h = nextnum();
v = nextnum();
drawl(h, v);
}
}
static void postspline(void)
{
int h2, v2;
int h1 = nextnum();
int v1 = nextnum();
if (iseol()) {
drawl(h1, v1);
return;
}
while (!iseol()) {
h2 = nextnum();
v2 = nextnum();
draws(h1, v1, h2, v2);
h1 = h2;
v1 = v2;
}
draws(h1, v1, 0, 0);
}
static void postdraw(void)
{
int h1, h2, v1, v2;
int c = next();
drawbeg();
switch (tolower(c)) {
case 'l':
h1 = nextnum();
v1 = nextnum();
drawl(h1, v1);
break;
case 'c':
drawc(nextnum());
break;
case 'e':
h1 = nextnum();
v1 = nextnum();
drawe(h1, v1);
break;
case 'a':
h1 = nextnum();
v1 = nextnum();
h2 = nextnum();
v2 = nextnum();
drawa(h1, v1, h2, v2);
break;
case '~':
postspline();
break;
case 'p':
postline();
break;
}
drawend(c == 'p' || c == 'P', c == 'E' || c == 'C' || c == 'P');
nexteol();
}
static void postps(void)
{
char cmd[ILNLEN];
char arg[ILNLEN];
nextword(cmd);
readln(arg);
if (!strcmp("PS", cmd) || !strcmp("ps", cmd))
out("%s\n", arg);
if (!strcmp("rotate", cmd))
outrotate(atoi(arg));
if (!strcmp("eps", cmd))
outeps(arg);
if (!strcmp("BeginObject", cmd))
drawmbeg(arg);
if (!strcmp("EndObject", cmd))
drawmend(arg);
}
static char postdir[PATHLEN] = TROFFFDIR; /* output device directory */
static char postdev[PATHLEN] = "utf"; /* output device name */
static void postx(void)
{
char cmd[128];
char font[128];
int pos;
nextword(cmd);
switch (cmd[0]) {
case 'f':
pos = nextnum();
nextword(font);
dev_mnt(pos, font, font);
outmnt(pos);
break;
case 'i':
if (dev_open(postdir, postdev)) {
fprintf(stderr, "neatpost: cannot open device %s\n", postdev);
exit(1);
}
ps_header(ps_pagewidth, ps_pageheight, ps_linewidth);
break;
case 'T':
nextword(postdev);
break;
case 's':
break;
case 'X':
postps();
break;
}
nexteol();
}
static void postcmd(int c)
{
char cs[GNLEN];
if (isdigit(c)) {
outrel((c - '0') * 10 + next() - '0', 0);
nextutf8(cs);
outc(cs);
return;
}
switch (c) {
case 's':
outsize(nextnum());
break;
case 'f':
outfont(nextnum());
break;
case 'H':
outh(nextnum());
break;
case 'V':
outv(nextnum());
break;
case 'h':
outrel(nextnum(), 0);
break;
case 'v':
outrel(0, nextnum());
break;
case 'c':
nextutf8(cs);
outc(cs);
break;
case 'm':
nextword(cs);
outcolor(clr_get(cs));
break;
case 'N':
nextnum();
break;
case 'C':
nextword(cs);
outc(cs);
break;
case 'p':
if (o_pages)
ps_pageend(o_pages);
o_pages = nextnum();
ps_pagebeg(o_pages);
outpage();
break;
case 'w':
break;
case 'n':
nextnum();
nextnum();
break;
case 'D':
postdraw();
break;
case 'x':
postx();
break;
case '#':
nexteol();
break;
default:
fprintf(stderr, "neatpost: unknown command %c\n", c);
}
}
static void post(void)
{
int c;
while ((c = next()) >= 0)
if (!isspace(c))
postcmd(c);
if (o_pages)
ps_pageend(o_pages);
}
static struct paper {
char *name;
int w, h;
} papers[] = {
{"letter", 2159, 2794},
{"legal", 2159, 3556},
{"ledger", 4318, 2794},
{"tabloid", 2794, 4318},
};
static void setpagesize(char *s)
{
int d1, d2, n, i;
/* predefined paper sizes */
for (i = 0; i < LEN(papers); i++) {
if (!strcmp(papers[i].name, s)) {
ps_pagewidth = papers[i].w;
ps_pageheight = papers[i].h;
return;
}
}
/* custom paper size in mm, like 2100x2970 for a4 */
if (isdigit(s[0]) && strchr(s, 'x')) {
ps_pagewidth = atoi(s);
ps_pageheight = atoi(strchr(s, 'x') + 1);
return;
}
/* ISO paper sizes */
if (!strchr("abcABC", s[0]) || !isdigit(s[1]))
return;
if (tolower(s[0]) == 'a') {
d1 = 8410;
d2 = 11890;
}
if (tolower(s[0]) == 'b') {
d1 = 10000;
d2 = 14140;
}
if (tolower(s[0]) == 'c') {
d1 = 9170;
d2 = 12970;
}
n = s[1] - '0';
ps_pagewidth = ((n & 1) ? d2 : d1) >> ((n + 1) >> 1);
ps_pageheight = ((n & 1) ? d1 : d2) >> (n >> 1);
ps_pagewidth -= ps_pagewidth % 10;
ps_pageheight -= ps_pageheight % 10;
}
static char *usage =
"Usage: neatpost [options] <input >output\n"
"Options:\n"
" -F dir \tset font directory (" TROFFFDIR ")\n"
" -p size \tset paper size; e.g., a4, letter, 2100x2970 (letter)\n"
" -w lwid \tdrawing line thickness in thousandths of an em (40)\n";
int main(int argc, char *argv[])
{
int i;
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-' && argv[i][1] == 'F') {
strcpy(postdir, argv[i][2] ? argv[i] + 2 : argv[++i]);
} else if (argv[i][0] == '-' && argv[i][1] == 'p') {
setpagesize(argv[i][2] ? argv[i] + 2 : argv[++i]);
} else if (argv[i][0] == '-' && argv[i][1] == 'w') {
ps_linewidth = atoi(argv[i][2] ? argv[i] + 2 : argv[++i]);
} else {
printf("%s", usage);
return 0;
}
}
post();
ps_trailer(o_pages, o_fonts);
return 0;
}