ref: fad7630769d6732aaae116114a17084e8f4d6d52
dir: /reg.c/
/* registers and environments */
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "roff.h"
#define NENVS 64 /* number of environment registers */
struct env {
int eregs[NENVS]; /* environment-specific number registers */
int tabs[NTABS]; /* tab stops */
char tabs_type[NTABS]; /* type of tabs: L, C, R */
struct fmt *fmt; /* per environment line formatting buffer */
struct wb wb; /* per environment partial word */
char tc[GNLEN]; /* tab character (.tc) */
char lc[GNLEN]; /* leader character (.lc) */
char hc[GNLEN]; /* hyphenation character (.hc) */
char mc[GNLEN]; /* margin character (.mc) */
};
static int nregs[NREGS]; /* global number registers */
static int nregs_inc[NREGS]; /* number register auto-increment size */
static int nregs_fmt[NREGS]; /* number register format */
static char *sregs[NREGS]; /* global string registers */
static void *sregs_dat[NREGS]; /* builtin function data */
static struct env *envs[NREGS];/* environments */
static struct env *env; /* current enviroment */
static int env_id; /* current environment id */
static int eregs_idx[NREGS]; /* register environment index in eregs[] */
static char *eregs[] = { /* environment-specific number registers */
"ln", ".f", ".i", ".j", ".l",
".L", ".nI", ".nm", ".nM", ".nn",
".nS", ".m", ".s", ".u", ".v",
".it", ".itn", ".mc", ".mcn",
".ce", ".f0", ".hy", ".hyp", ".i0", ".l0",
".L0", ".m0", ".n0", ".s0", ".ss", ".ssh", ".sss",
".ti", ".lt", ".lt0", ".v0",
};
/* return the address of a number register */
int *nreg(int id)
{
if (eregs_idx[id])
return &env->eregs[eregs_idx[id]];
return &nregs[id];
}
static int num_fmt(char *s, int n, int fmt);
/* the contents of a number register (returns a static buffer) */
char *num_str(int id)
{
static char numbuf[128];
char *s = map_name(id);
numbuf[0] = '\0';
if (s[0] == '.' && !s[2]) {
switch (s[1]) {
case 'b':
sprintf(numbuf, "%d", dev_getbd(n_f));
return numbuf;
case 'c':
sprintf(numbuf, "%d", in_lnum());
return numbuf;
case 'k':
sprintf(numbuf, "%d", f_hpos());
return numbuf;
case 'm':
sprintf(numbuf, "#%02x%02x%02x",
CLR_R(n_m), CLR_G(n_m), CLR_B(n_m));
return numbuf;
case 't':
sprintf(numbuf, "%d", f_nexttrap());
return numbuf;
case 'z':
if (f_divreg() >= 0)
sprintf(numbuf, "%s", map_name(f_divreg()));
return numbuf;
case 'F':
sprintf(numbuf, "%s", in_filename());
return numbuf;
case '$':
sprintf(numbuf, "%d", in_nargs());
return numbuf;
}
}
if (s[0] == '.' && !strcmp(".neat", s))
return "1";
if (id == map("yr")) {
sprintf(numbuf, "%02d", nregs[id]);
return numbuf;
}
if (!nregs_fmt[id] || num_fmt(numbuf, *nreg(id), nregs_fmt[id]))
sprintf(numbuf, "%d", *nreg(id));
return numbuf;
}
void num_set(int id, int val)
{
*nreg(id) = val;
}
void num_inc(int id, int val)
{
nregs_inc[id] = val;
}
void num_del(int id)
{
*nreg(id) = 0;
nregs_inc[id] = 0;
nregs_fmt[id] = 0;
}
int num_get(int id, int inc)
{
if (inc)
*nreg(id) += inc > 0 ? nregs_inc[id] : -nregs_inc[id];
return *nreg(id);
}
void str_set(int id, char *s)
{
int len = strlen(s) + 1;
if (sregs[id])
free(sregs[id]);
sregs[id] = xmalloc(len);
memcpy(sregs[id], s, len);
sregs_dat[id] = NULL;
}
char *str_get(int id)
{
return sregs[id];
}
void *str_dget(int id)
{
return sregs_dat[id];
}
void str_dset(int id, void *d)
{
sregs_dat[id] = d;
}
void str_rm(int id)
{
if (sregs[id])
free(sregs[id]);
sregs[id] = NULL;
sregs_dat[id] = NULL;
}
void str_rn(int src, int dst)
{
str_rm(dst);
sregs[dst] = sregs[src];
sregs_dat[dst] = sregs_dat[src];
sregs[src] = NULL;
sregs_dat[src] = NULL;
}
static struct env *env_alloc(void)
{
struct env *env = xmalloc(sizeof(*env));
memset(env, 0, sizeof(*env));
wb_init(&env->wb);
env->fmt = fmt_alloc();
return env;
}
static void env_free(struct env *env)
{
fmt_free(env->fmt);
wb_done(&env->wb);
free(env);
}
static void env_set(int id)
{
int i;
env = envs[id];
env_id = id;
if (!env) {
envs[id] = env_alloc();
env = envs[id];
n_f = 1;
n_i = 0;
n_j = AD_B;
n_l = SC_IN * 65 / 10;
n_L = 1;
n_s = 10;
n_u = 1;
n_v = 12 * SC_PT;
n_s0 = n_s;
n_f0 = n_f;
n_na = 0;
n_lt = SC_IN * 65 / 10;
n_hy = 1;
n_ss = 12;
n_sss = 12;
n_nM = 1;
n_nS = 1;
strcpy(env->hc, "\\%");
strcpy(env->lc, ".");
for (i = 0; i < NTABS; i++)
env->tabs[i] = i * SC_IN / 2;
}
}
static void init_time(void)
{
time_t t = time(NULL);
struct tm *tm = localtime(&t);
nregs[map("dw")] = tm->tm_wday + 1;
nregs[map("dy")] = tm->tm_mday;
nregs[map("mo")] = tm->tm_mon + 1;
nregs[map("yr")] = tm->tm_year % 100;
}
static void init_globals(void)
{
n_o = SC_IN;
n_p = SC_IN * 11;
n_lg = 1;
n_kn = 0;
}
void env_init(void)
{
int i;
init_time();
init_globals();
for (i = 0; i < LEN(eregs); i++)
eregs_idx[map(eregs[i])] = i + 1;
env_set(0);
}
void env_done(void)
{
int i;
for (i = 0; i < LEN(envs); i++)
if (envs[i])
env_free(envs[i]);
}
static int oenv[NPREV]; /* environment stack */
static int nenv;
void tr_ev(char **args)
{
int id = -1;
if (args[1])
id = map(args[1]);
else
id = nenv ? oenv[--nenv] : -1;
if (id < 0)
return;
if (args[1] && env && nenv < NPREV)
oenv[nenv++] = env_id;
env_set(id);
}
struct fmt *env_fmt(void)
{
return env->fmt;
}
struct wb *env_wb(void)
{
return &env->wb;
}
char *env_hc(void)
{
return env->hc;
}
char *env_mc(void)
{
return env->mc;
}
char *env_tc(void)
{
return env->tc;
}
char *env_lc(void)
{
return env->lc;
}
/* saving and restoring registers around diverted lines */
struct odiv {
int f, s, m, f0, s0, m0;
};
static struct odiv odivs[NPREV]; /* state before diverted text */
static int nodivs;
/* begin outputting diverted line */
void odiv_beg(void)
{
struct odiv *o = &odivs[nodivs++];
o->f = n_f;
o->s = n_s;
o->m = n_m;
o->f0 = n_f0;
o->s0 = n_s0;
o->m0 = n_m0;
}
/* end outputting diverted line */
void odiv_end(void)
{
struct odiv *o = &odivs[--nodivs];
n_f = o->f;
n_s = o->s;
n_m = o->m;
n_f0 = o->f0;
n_s0 = o->s0;
n_m0 = o->m0;
}
void tr_ta(char **args)
{
int i;
char *s;
for (i = 0; i < NARGS && args[i]; i++) {
env->tabs[i] = eval_re(args[i], i > 0 ? env->tabs[i - 1] : 0, 'm');
s = args[i][0] ? strchr(args[i], '\0') - 1 : "";
env->tabs_type[i] = strchr("LRC", *s) ? *s : 'L';
}
}
static int tab_idx(int pos)
{
int i;
for (i = 0; i < LEN(env->tabs); i++)
if (env->tabs[i] > pos)
return i;
return -1;
}
int tab_next(int pos)
{
int i = tab_idx(pos);
return i >= 0 ? env->tabs[i] : pos;
}
int tab_type(int pos)
{
int i = tab_idx(pos);
return i >= 0 && env->tabs_type[i] ? env->tabs_type[i] : 'L';
}
/* number register format (.af) */
#define NF_LSH 8 /* number format length shifts */
#define NF_FMT 0x00ff /* number format mask */
/* the format of a number register (returns a static buffer) */
char *num_getfmt(int id)
{
static char fmtbuf[128];
char *s = fmtbuf;
int i;
if (!nregs_fmt[id] || (nregs_fmt[id] & NF_FMT) == '0') {
*s++ = '0';
i = nregs_fmt[id] >> NF_LSH;
while (i-- > 1)
*s++ = '0';
} else {
*s++ = nregs_fmt[id] & NF_FMT;
}
*s = '\0';
return fmtbuf;
}
void num_setfmt(int id, char *s)
{
int i = 0;
if (strchr("iIaA", s[0])) {
nregs_fmt[id] = s[0];
} else {
while (isdigit(s[i]))
i++;
nregs_fmt[id] = '0' | (i << NF_LSH);
}
}
static void nf_reverse(char *s)
{
char r[128];
int i, l;
strcpy(r, s);
l = strlen(r);
for (i = 0; i < l; i++)
s[i] = r[l - i - 1];
}
static void nf_roman(char *s, int n, char *I, char *V)
{
int i;
if (!n)
return;
if (n % 5 == 4) {
*s++ = n % 10 == 9 ? I[1] : V[0];
*s++ = I[0];
} else {
for (i = 0; i < n % 5; i++)
*s++ = I[0];
if (n % 10 >= 5)
*s++ = V[0];
}
*s = '\0';
nf_roman(s, n / 10, I + 1, V + 1);
}
static void nf_alpha(char *s, int n, int a)
{
while (n) {
*s++ = a + ((n - 1) % 26);
n /= 26;
}
*s = '\0';
}
/* returns nonzero on failure */
static int num_fmt(char *s, int n, int fmt)
{
int type = fmt & NF_FMT;
int len;
if (n < 0) {
n = -n;
*s++ = '-';
}
if ((type == 'i' || type == 'I') && n > 0 && n < 40000) {
if (type == 'i')
nf_roman(s, n, "ixcmz", "vldw");
else
nf_roman(s, n, "IXCMZ", "VLDW");
nf_reverse(s);
return 0;
}
if ((type == 'a' || type == 'A') && n > 0) {
nf_alpha(s, n, type);
nf_reverse(s);
return 0;
}
if (type == '0') {
sprintf(s, "%d", n);
len = strlen(s);
while (len++ < fmt >> NF_LSH)
*s++ = '0';
sprintf(s, "%d", n);
return 0;
}
return 1;
}