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dir.c
161 lines (151 loc) · 2.96 KB
/
dir.c
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/* output text direction */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "roff.h"
int dir_do; /* enable text direction processing */
static char *dbuf; /* text in n_td direction */
static int dbuf_sz, dbuf_n; /* dbuf[] size and length */
static char *rbuf; /* text in (1 - n_td) direction */
static int rbuf_sz, rbuf_n; /* rbuf[] size and length */
static int dir_cd; /* current direction */
/* append s to the start (dir == 0) or end (dir == 1) of d */
static void dir_copy(char **d, int *d_n, int *d_sz, char *s, int s_n, int dir)
{
while (*d_n + s_n + 1 > *d_sz) {
int sz = *d_sz ? *d_sz * 2 : 512;
char *n = malloc(sz + 1);
if (*d_sz)
memcpy(dir ? n + *d_sz : n, *d, *d_sz);
free(*d);
*d_sz = sz;
*d = n;
}
if (dir > 0)
memcpy(*d + *d_sz - *d_n - s_n, s, s_n);
else
memcpy(*d + *d_n, s, s_n);
*d_n += s_n;
}
/* copy rbuf (the text in reverse direction) to dbuf */
static void dir_flush(void)
{
char *s = rbuf + (n_td > 0 ? 0 : rbuf_sz - rbuf_n);
dir_copy(&dbuf, &dbuf_n, &dbuf_sz, s, rbuf_n, n_td);
rbuf_n = 0;
}
/* append s to dbuf or rbuf based on the current text direction */
static void dir_append(char *s)
{
int dir = dir_cd > 0;
if (dir == n_td && rbuf_n)
dir_flush();
if (dir == n_td)
dir_copy(&dbuf, &dbuf_n, &dbuf_sz, s, strlen(s), dir);
else
dir_copy(&rbuf, &rbuf_n, &rbuf_sz, s, strlen(s), dir);
}
static void setfont(int f)
{
char cmd[32];
sprintf(cmd, "%cf(%02d", c_ec, f);
if (f >= 0)
dir_append(cmd);
}
static void setsize(int s)
{
char cmd[32];
sprintf(cmd, s <= 99 ? "%cs(%02d" : "%cs[%d]", c_ec, s);
if (s >= 0)
dir_append(cmd);
}
static void setcolor(int m)
{
char cmd[32];
sprintf(cmd, "%cm[%s]", c_ec, clr_str(m));
if (m >= 0)
dir_append(cmd);
}
void dir_fix(struct sbuf *sbuf, char *src)
{
char cmd[1024];
char *prev_s = src;
char *r, *c;
int f = -1, s = -1, m = -1;
int t, n;
dir_cd = n_td;
while ((t = escread(&src, &c)) >= 0) {
cmd[0] = '\0';
switch (t) {
case 0:
case 'D':
case 'h':
case 'v':
case 'x':
memcpy(cmd, prev_s, src - prev_s);
cmd[src - prev_s] = '\0';
dir_append(cmd);
break;
case 'f':
n = atoi(c);
if (f != n) {
setfont(f);
f = n;
setfont(f);
}
break;
case 'm':
n = clr_get(c);
if (m != n) {
setcolor(m);
m = n;
setcolor(m);
}
break;
case 's':
n = atoi(c);
if (s != n) {
setsize(s);
s = n;
setsize(s);
}
break;
case 'X':
sprintf(cmd, "%c%c%s", c_ec, t, c);
dir_append(cmd);
break;
case '<':
setcolor(m);
setfont(f);
setsize(s);
dir_cd = 1;
setsize(s);
setfont(f);
setcolor(m);
break;
case '>':
setcolor(m);
setfont(f);
setsize(s);
dir_cd = 0;
setsize(s);
setfont(f);
setcolor(m);
break;
}
prev_s = src;
}
setcolor(m);
setfont(f);
setsize(s);
dir_flush();
r = n_td > 0 ? dbuf + dbuf_sz - dbuf_n : dbuf;
r[dbuf_n] = '\0';
dbuf_n = 0;
sbuf_append(sbuf, r);
}
void dir_done(void)
{
free(rbuf);
free(dbuf);
}