ref: 2537e65c9654edeacfb99ffa33c3b220294e2303
dir: /tr.c/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "xroff.h"
#define NARGS 10
#define LINEL 1024
#define LEN(a) (sizeof(a) / sizeof((a)[0]))
static int tr_nl = 1;
static int unit_scale(int c, int n, int mag)
{
int mul = 1;
int div = 1;
switch (c) {
case 'i':
mul = SC_IN;
break;
case 'c':
mul = SC_IN * 50;
div = 127;
break;
case 'p':
mul = SC_IN;
div = 72;
break;
case 'P':
mul = SC_IN;
div = 6;
break;
case 'v':
mul = n_v;
break;
case 'm':
mul = n_s * SC_IN;
div = 72;
break;
case 'n':
mul = n_s * SC_IN;
div = 144;
break;
}
/* it may overflow */
return n * mul / div / mag;
}
int tr_int(char *s, int orig, int unit)
{
int n = 0; /* the result */
int mag = 0; /* n should be divided by mag */
int rel = 0; /* n should be added to orig */
int neg = *s == '-'; /* n should be negated */
if (*s == '+' || *s == '-') {
rel = 1;
s++;
}
while (isdigit(*s) || *s == '.') {
if (*s == '.') {
mag = 1;
s++;
continue;
}
mag *= 10;
n = n * 10 + *s++ - '0';
}
if (!mag)
mag = 1;
if (unit)
n = unit_scale(*s ? *s : unit, n, mag);
else
n /= mag;
if (neg)
n = -n;
return rel ? orig + n : n;
}
static void tr_ll(int argc, char **args)
{
if (argc >= 2)
n_l = tr_int(args[1], n_l, 'm');
}
static void tr_vs(int argc, char **args)
{
if (argc >= 2)
n_v = tr_int(args[1], n_v, 'p');
}
static void tr_ds(int argc, char **args)
{
if (argc < 3)
return;
str_set(N_ID(args[1][0], args[1][1]), args[2]);
}
static char *arg_regname(char *s, int len);
static void tr_de(int argc, char **args)
{
struct sbuf sbuf;
char buf[4];
int end[4] = {'.'};
int c;
int i;
if (argc <= 1)
return;
if (argc > 2 && args[2]) {
end[0] = args[2][0];
end[1] = args[2][1];
}
sbuf_init(&sbuf);
while ((c = cp_next()) >= 0) {
sbuf_add(&sbuf, c);
if (c == '\n') {
sbuf_add(&sbuf, c);
c = cp_next();
if (c == '.') {
arg_regname(buf, 4);
if (buf[0] == end[0] && buf[1] == end[1])
break;
sbuf_add(&sbuf, '.');
for (i = 0; buf[i]; i++)
sbuf_add(&sbuf, (unsigned char) buf[i]);
} else {
if (c >= 0)
sbuf_add(&sbuf, c);
}
}
}
str_set(N_ID(args[1][0], args[1][1]), sbuf_buf(&sbuf));
sbuf_done(&sbuf);
}
static void tr_in(int argc, char **args)
{
if (argc >= 2)
n_i = tr_int(args[1], n_i, 'm');
}
static void tr_na(int argc, char **args)
{
n_ad = 0;
}
static char *arg_regname(char *s, int len)
{
char *e = s + 2;
int c;
while ((c = cp_next()) == ' ')
;
while (s < e && c >= 0 && c != ' ' && c != '\n') {
*s++ = c;
c = cp_next();
}
if (c >= 0)
cp_back(c);
*s++ = '\0';
return s;
}
static char *arg_normal(char *s, int len)
{
char *e = s + len - 1;
int quoted = 0;
int c;
while ((c = cp_next()) == ' ')
;
if (c == '"') {
quoted = 1;
c = cp_next();
}
while (s < e && c > 0 && c != '\n') {
if (!quoted && c == ' ')
break;
if (quoted && c == '"') {
c = cp_next();
if (c != '"')
break;
}
*s++ = c;
c = cp_next();
}
if (c >= 0)
cp_back(c);
*s++ = '\0';
return s;
}
static char *arg_string(char *s, int len)
{
char *e = s + len - 1;
int c;
while ((c = cp_next()) == ' ')
;
if (c == '"')
c = cp_next();
while (s < e && c > 0 && c != '\n') {
*s++ = c;
c = cp_next();
}
*s++ = '\0';
if (c >= 0)
cp_back(c);
return s;
}
/* skip everything until the end of line */
static void jmp_eol(void)
{
int c;
do {
c = cp_next();
} while (c >= 0 && c != '\n');
}
/* read macro arguments */
static int mkargs(char **args, int maxargs, char *buf, int len)
{
char *s = buf;
char *e = buf + len - 1;
int c;
int n = 0;
while (n < maxargs) {
c = cp_next();
if (c < 0 || c == '\n')
return n;
cp_back(c);
args[n++] = s;
s = arg_normal(s, e - s);
}
jmp_eol();
return n;
}
/* read arguments for .ds */
static int mkargs_ds(char **args, int maxargs, char *buf, int len)
{
char *s = buf;
char *e = buf + len - 1;
int c;
args[0] = s;
s = arg_regname(s, e - s);
args[1] = s;
s = arg_string(s, e - s);
c = cp_next();
if (c >= 0 && c != '\n')
jmp_eol();
return 2;
}
/* read arguments for commands .nr that expect a register name */
static int mkargs_reg1(char **args, int maxargs, char *buf, int len)
{
char *s = buf;
char *e = buf + len - 1;
args[0] = s;
s = arg_regname(s, e - s);
return mkargs(args + 1, maxargs - 1, s, e - s) + 1;
}
static struct cmd {
char *id;
void (*f)(int argc, char **args);
int (*args)(char **args, int maxargs, char *buf, int len);
} cmds[] = {
{"br", tr_br},
{"de", tr_de, mkargs_reg1},
{"ds", tr_ds, mkargs_ds},
{"fp", tr_fp},
{"ft", tr_ft},
{"in", tr_in},
{"ll", tr_ll},
{"na", tr_na},
{"nr", tr_nr, mkargs_reg1},
{"ps", tr_ps},
{"sp", tr_sp},
{"vs", tr_vs},
};
int tr_next(void)
{
int c = cp_next();
int nl = c == '\n';
char *args[NARGS];
char buf[LINEL];
char cmd[LINEL];
struct cmd *req = NULL;
int argc;
int i;
while (tr_nl && (c == '.' || c == '\'')) {
nl = 1;
args[0] = cmd;
cmd[0] = c;
arg_regname(cmd + 1, LINEL - 2);
for (i = 0; i < LEN(cmds); i++)
if (!strcmp(cmd + 1, cmds[i].id))
req = &cmds[i];
if (req) {
if (req->args)
argc = req->args(args + 1, NARGS - 1, buf, LINEL);
else
argc = mkargs(args + 1, NARGS - 1, buf, LINEL);
req->f(argc + 1, args);
} else {
jmp_eol();
}
c = cp_next();
}
tr_nl = nl;
return c;
}