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busybox/console-tools/loadacm.c

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/* vi: set sw=4 ts=4: */
/*
* Derived from
* mapscrn.c - version 0.92
*
* Was taken from console-tools and adapted by
* Peter Novodvorsky <petya@logic.ru>
*/
#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <sys/kd.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include "busybox.h"
typedef unsigned short unicode;
static long int ctoi(unsigned char *s, int *is_unicode);
static int old_screen_map_read_ascii(FILE * fp, unsigned char buf[]);
static int uni_screen_map_read_ascii(FILE * fp, unicode buf[], int *is_unicode);
static unicode utf8_to_ucs2(char *buf);
static int screen_map_load(int fd, FILE * fp);
int loadacm_main(int argc, char **argv)
{
int fd;
if (argc>=2 && *argv[1]=='-') {
show_usage();
}
fd = open("/dev/tty", O_RDWR);
if (fd < 0) {
perror_msg_and_die("Error opening /dev/tty1");
}
if (screen_map_load(fd, stdin)) {
perror_msg_and_die("Error loading acm");
}
write(fd, "\033(K", 3);
return EXIT_SUCCESS;
}
static int screen_map_load(int fd, FILE * fp)
{
struct stat stbuf;
unicode wbuf[E_TABSZ];
unsigned char buf[E_TABSZ];
int parse_failed = 0;
int is_unicode;
if (fstat(fileno(fp), &stbuf))
perror_msg_and_die("Cannot stat map file");
/* first try a UTF screen-map: either ASCII (no restriction) or binary (regular file) */
if (!
(parse_failed =
(-1 == uni_screen_map_read_ascii(fp, wbuf, &is_unicode)))
|| (S_ISREG(stbuf.st_mode) && (stbuf.st_size == (sizeof(unicode) * E_TABSZ)))) { /* test for binary UTF map by size */
if (parse_failed) {
if (-1 == fseek(fp, 0, SEEK_SET)) {
if (errno == ESPIPE)
error_msg_and_die("16bit screen-map MUST be a regular file.");
else
perror_msg_and_die("fseek failed reading binary 16bit screen-map");
}
if (fread(wbuf, sizeof(unicode) * E_TABSZ, 1, fp) != 1)
perror_msg_and_die("Cannot read [new] map from file");
#if 0
else
error_msg("Input screen-map is binary.");
#endif
}
/* if it was effectively a 16-bit ASCII, OK, else try to read as 8-bit map */
/* same if it was binary, ie. if parse_failed */
if (parse_failed || is_unicode) {
if (ioctl(fd, PIO_UNISCRNMAP, wbuf))
perror_msg_and_die("PIO_UNISCRNMAP ioctl");
else
return 0;
}
}
/* rewind... */
if (-1 == fseek(fp, 0, SEEK_SET)) {
if (errno == ESPIPE)
error_msg("Assuming 8bit screen-map - MUST be a regular file."),
exit(1);
else
perror_msg_and_die("fseek failed assuming 8bit screen-map");
}
/* ... and try an old 8-bit screen-map */
if (!(parse_failed = (-1 == old_screen_map_read_ascii(fp, buf))) ||
(S_ISREG(stbuf.st_mode) && (stbuf.st_size == E_TABSZ))) { /* test for binary old 8-bit map by size */
if (parse_failed) {
if (-1 == fseek(fp, 0, SEEK_SET)) {
if (errno == ESPIPE)
/* should not - it succedeed above */
error_msg_and_die("fseek() returned ESPIPE !");
else
perror_msg_and_die("fseek for binary 8bit screen-map");
}
if (fread(buf, E_TABSZ, 1, fp) != 1)
perror_msg_and_die("Cannot read [old] map from file");
#if 0
else
error_msg("Input screen-map is binary.");
#endif
}
if (ioctl(fd, PIO_SCRNMAP, buf))
perror_msg_and_die("PIO_SCRNMAP ioctl");
else
return 0;
}
error_msg("Error parsing symbolic map");
return(1);
}
/*
* - reads `fp' as a 16-bit ASCII SFM file.
* - returns -1 on error.
* - returns it in `unicode' in an E_TABSZ-elements array.
* - sets `*is_unicode' flagiff there were any non-8-bit
* (ie. real 16-bit) mapping.
*
* FIXME: ignores everything after second word
*/
static int uni_screen_map_read_ascii(FILE * fp, unicode buf[], int *is_unicode)
{
char buffer[256]; /* line buffer reading file */
char *p, *q; /* 1st + 2nd words in line */
int in, on; /* the same, as numbers */
int tmp_is_unicode; /* tmp for is_unicode calculation */
int i; /* loop index - result holder */
int ret_code = 0; /* return code */
sigset_t sigset, old_sigset;
assert(is_unicode);
*is_unicode = 0;
/* first 128 codes defaults to ASCII */
for (i = 0; i < 128; i++)
buf[i] = i;
/* remaining defaults to replacement char (usually E_TABSZ = 256) */
for (; i < E_TABSZ; i++)
buf[i] = 0xfffd;
/* block SIGCHLD */
sigemptyset(&sigset);
sigaddset(&sigset, SIGCHLD);
sigprocmask(SIG_BLOCK, &sigset, &old_sigset);
do {
if (NULL == fgets(buffer, sizeof(buffer), fp)) {
if (feof(fp))
break;
else
perror_msg_and_die("uni_screen_map_read_ascii() can't read line");
}
/* get "charset-relative charcode", stripping leading spaces */
p = strtok(buffer, " \t\n");
/* skip empty lines and comments */
if (!p || *p == '#')
continue;
/* get unicode mapping */
q = strtok(NULL, " \t\n");
if (q) {
in = ctoi(p, NULL);
if (in < 0 || in > 255) {
ret_code = -1;
break;
}
on = ctoi(q, &tmp_is_unicode);
if (in < 0 && on > 65535) {
ret_code = -1;
break;
}
*is_unicode |= tmp_is_unicode;
buf[in] = on;
} else {
ret_code = -1;
break;
}
}
while (1); /* terminated by break on feof() */
/* restore sig mask */
sigprocmask(SIG_SETMASK, &old_sigset, NULL);
return ret_code;
}
static int old_screen_map_read_ascii(FILE * fp, unsigned char buf[])
{
char buffer[256];
int in, on;
char *p, *q;
for (in = 0; in < 256; in++)
buf[in] = in;
while (fgets(buffer, sizeof(buffer) - 1, fp)) {
p = strtok(buffer, " \t\n");
if (!p || *p == '#')
continue;
q = strtok(NULL, " \t\n#");
if (q) {
in = ctoi(p, NULL);
if (in < 0 || in > 255)
return -1;
on = ctoi(q, NULL);
if (in < 0 && on > 255)
return -1;
buf[in] = on;
} else
return -1;
}
return (0);
}
/*
* - converts a string into an int.
* - supports dec and hex bytes, hex UCS2, single-quoted byte and UTF8 chars.
* - returns the converted value
* - if `is_unicode != NULL', use it to tell whether it was unicode
*
* CAVEAT: will report valid UTF mappings using only 1 byte as 8-bit ones.
*/
static long int ctoi(unsigned char *s, int *is_unicode)
{
int i;
size_t ls;
ls = strlen(s);
if (is_unicode)
*is_unicode = 0;
/* hex-specified UCS2 */
if ((strncmp(s, "U+", 2) == 0) &&
(strspn(s + 2, "0123456789abcdefABCDEF") == ls - 2)) {
sscanf(s + 2, "%x", &i);
if (is_unicode)
*is_unicode = 1;
}
/* hex-specified byte */
else if ((ls <= 4) && (strncmp(s, "0x", 2) == 0) &&
(strspn(s + 2, "0123456789abcdefABCDEF") == ls - 2))
sscanf(s + 2, "%x", &i);
/* oct-specified number (byte) */
else if ((*s == '0') && (strspn(s, "01234567") == ls))
sscanf(s, "%o", &i);
/* dec-specified number (byte) */
else if (strspn(s, "0123456789") == ls)
sscanf(s, "%d", &i);
/* single-byte quoted char */
else if ((strlen(s) == 3) && (s[0] == '\'') && (s[2] == '\''))
i = s[1];
/* multi-byte UTF8 quoted char */
else if ((s[0] == '\'') && (s[ls - 1] == '\'')) {
s[ls - 1] = 0; /* ensure we'll not "parse UTF too far" */
i = utf8_to_ucs2(s + 1);
if (is_unicode)
*is_unicode = 1;
} else
return (-1);
return (i);
}
static unicode utf8_to_ucs2(char *buf)
{
int utf_count = 0;
long utf_char = 0;
unicode tc = 0;
unsigned char c;
do {
c = *buf;
buf++;
/* if byte should be part of multi-byte sequence */
if (c & 0x80) {
/* if we have already started to parse a UTF8 sequence */
if (utf_count > 0 && (c & 0xc0) == 0x80) {
utf_char = (utf_char << 6) | (c & 0x3f);
utf_count--;
if (utf_count == 0)
tc = utf_char;
else
continue;
} else { /* Possibly 1st char of a UTF8 sequence */
if ((c & 0xe0) == 0xc0) {
utf_count = 1;
utf_char = (c & 0x1f);
} else if ((c & 0xf0) == 0xe0) {
utf_count = 2;
utf_char = (c & 0x0f);
} else if ((c & 0xf8) == 0xf0) {
utf_count = 3;
utf_char = (c & 0x07);
} else if ((c & 0xfc) == 0xf8) {
utf_count = 4;
utf_char = (c & 0x03);
} else if ((c & 0xfe) == 0xfc) {
utf_count = 5;
utf_char = (c & 0x01);
} else
utf_count = 0;
continue;
}
} else { /* not part of multi-byte sequence - treat as ASCII
* this makes incomplete sequences to be ignored
*/
tc = c;
utf_count = 0;
}
}
while (utf_count);
return tc;
}
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