mirror of
https://github.com/sheumann/hush.git
synced 2024-11-04 14:05:24 +00:00
442 lines
9.9 KiB
C
442 lines
9.9 KiB
C
/*
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* Derived from
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* mapscrn.c - version 0.92
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*
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* Was taken from console-tools and adapted by
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* Peter Novodvorsky <petya@logic.ru>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <memory.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/kd.h>
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typedef unsigned short unicode;
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static long int ctoi(unsigned char *s, int *is_unicode);
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int old_screen_map_read_ascii(FILE *fp, unsigned char buf[]);
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int uni_screen_map_read_ascii(FILE *fp, unicode buf[], int* is_unicode);
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unicode utf8_to_ucs2 (char* buf);
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int screen_map_load(int fd, FILE *fp);
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int loadacm_main(int argc, char **argv)
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{
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int fd;
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fd = open("/dev/tty", O_RDWR);
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if (fd < 0) {
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fprintf(stderr, "Error opening /dev/tty1: %s\n", strerror(errno));
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return 1;
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}
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if (screen_map_load(fd, stdin))
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{
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fprintf(stderr, "Error loading acm: %s\n", strerror(errno));
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return 1;
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}
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write(fd, "\033(K", 3);
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return 0;
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}
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int screen_map_load(int fd, FILE *fp)
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{
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struct stat stbuf;
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unicode wbuf[E_TABSZ];
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unsigned char buf[E_TABSZ];
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int parse_failed = 0;
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int is_unicode;
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if (fstat(fp->_fileno, &stbuf))
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perror("Cannot stat map file"), exit(1);
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/* first try a UTF screen-map: either ASCII (no restriction) or binary (regular file) */
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if (!(parse_failed = (-1 == uni_screen_map_read_ascii(fp,wbuf,&is_unicode))) ||
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(S_ISREG(stbuf.st_mode) &&
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(stbuf.st_size == (sizeof(unicode) * E_TABSZ)))) /* test for binary UTF map by size */
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{
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if (parse_failed)
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{
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if (-1 == fseek (fp, 0, SEEK_SET))
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{
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if (errno == ESPIPE)
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fprintf (stderr, "16bit screen-map MUST be a regular file.\n"), exit (1);
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else
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perror ("fseek failed reading binary 16bit screen-map"), exit (1);
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}
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if (fread(wbuf, sizeof(unicode) * E_TABSZ, 1, fp) != 1)
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perror("Cannot read [new] map from file"), exit(1);
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#if 0
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else
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fprintf(stderr, "Input screen-map is binary.\n");
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#endif
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}
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/* if it was effectively a 16-bit ASCII, OK, else try to read as 8-bit map */
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/* same if it was binary, ie. if parse_failed */
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if (parse_failed || is_unicode)
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{
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if (ioctl(fd,PIO_UNISCRNMAP,wbuf))
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perror("PIO_UNISCRNMAP ioctl"), exit(1);
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else
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return 0;
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}
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}
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/* rewind... */
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if (-1 == fseek (fp, 0, SEEK_SET))
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{
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if (errno == ESPIPE)
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fprintf (stderr, "Assuming 8bit screen-map - MUST be a regular file.\n"), exit (1);
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else
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perror ("fseek failed assuming 8bit screen-map"), exit (1);
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}
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/* ... and try an old 8-bit screen-map */
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if (!(parse_failed = (-1 == old_screen_map_read_ascii(fp,buf))) ||
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(S_ISREG(stbuf.st_mode) &&
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(stbuf.st_size == E_TABSZ))) /* test for binary old 8-bit map by size */
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{
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if (parse_failed)
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{
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if (-1 == fseek (fp, 0, SEEK_SET))
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{
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if (errno == ESPIPE)
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/* should not - it succedeed above */
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fprintf (stderr, "fseek() returned ESPIPE !\n"), exit (1);
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else
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perror ("fseek for binary 8bit screen-map"), exit (1);
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}
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if (fread(buf,E_TABSZ,1,fp) != 1)
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perror("Cannot read [old] map from file"), exit(1);
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#if 0
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else
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fprintf(stderr, "Input screen-map is binary.\n");
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#endif
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}
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if (ioctl(fd,PIO_SCRNMAP,buf))
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perror("PIO_SCRNMAP ioctl"), exit(1);
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else
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return 0;
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}
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else
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{
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fprintf(stderr, "Error parsing symbolic map\n");
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exit(1);
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}
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}
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/*
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* - reads `fp' as a 16-bit ASCII SFM file.
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* - returns -1 on error.
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* - returns it in `unicode' in an E_TABSZ-elements array.
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* - sets `*is_unicode' flagiff there were any non-8-bit
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* (ie. real 16-bit) mapping.
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*
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* FIXME: ignores everything after second word
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*/
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int uni_screen_map_read_ascii(FILE *fp, unicode buf[], int *is_unicode)
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{
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char buffer[256]; /* line buffer reading file */
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char *p, *q; /* 1st + 2nd words in line */
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int in, on; /* the same, as numbers */
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int tmp_is_unicode; /* tmp for is_unicode calculation */
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int i; /* loop index - result holder */
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int ret_code = 0; /* return code */
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sigset_t sigset, old_sigset;
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assert (is_unicode);
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*is_unicode = 0;
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/* first 128 codes defaults to ASCII */
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for (i=0; i<128; i++) buf[i] = i;
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/* remaining defaults to replacement char (usually E_TABSZ = 256) */
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for ( ; i<E_TABSZ; i++) buf[i] = 0xfffd;
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/* block SIGCHLD */
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sigemptyset (&sigset);
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sigaddset (&sigset, SIGCHLD);
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sigprocmask (SIG_BLOCK, &sigset, &old_sigset);
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do
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{
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if (NULL == fgets(buffer, sizeof(buffer),fp))
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{
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if (feof (fp))
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break;
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else
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{
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perror ("uni_screen_map_read_ascii() can't read line");
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exit (2);
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}
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}
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/* get "charset-relative charcode", stripping leading spaces */
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p = strtok(buffer," \t\n");
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/* skip empty lines and comments */
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if (!p || *p == '#')
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continue;
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/* get unicode mapping */
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q = strtok(NULL," \t\n");
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if (q)
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{
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in = ctoi(p, NULL);
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if (in < 0 || in > 255)
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{
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ret_code = -1;
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break;
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}
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on = ctoi(q, &tmp_is_unicode);
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if (in < 0 && on > 65535)
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{
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ret_code = -1;
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break;
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}
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*is_unicode |= tmp_is_unicode;
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buf[in] = on;
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}
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else
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{
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ret_code = -1;
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break;
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}
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}
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while (1); /* terminated by break on feof() */
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/* restore sig mask */
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sigprocmask (SIG_SETMASK, &old_sigset, NULL);
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return ret_code;
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}
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int old_screen_map_read_ascii(FILE *fp, unsigned char buf[])
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{
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char buffer[256];
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int in, on;
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char *p, *q;
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for (in=0; in<256; in++) buf[in]=in;
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while (fgets(buffer,sizeof(buffer)-1,fp))
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{
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p = strtok(buffer," \t\n");
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if (!p || *p == '#')
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continue;
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q = strtok(NULL," \t\n#");
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if (q)
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{
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in = ctoi(p, NULL);
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if (in < 0 || in > 255) return -1;
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on = ctoi(q, NULL);
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if (in < 0 && on > 255) return -1;
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buf[in] = on;
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}
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else return -1;
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}
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return(0);
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}
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/*
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* - converts a string into an int.
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* - supports dec and hex bytes, hex UCS2, single-quoted byte and UTF8 chars.
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* - returns the converted value
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* - if `is_unicode != NULL', use it to tell whether it was unicode
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*
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* CAVEAT: will report valid UTF mappings using only 1 byte as 8-bit ones.
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*/
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long int ctoi(unsigned char *s, int *is_unicode)
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{
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int i;
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size_t ls;
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ls = strlen(s);
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if (is_unicode) *is_unicode = 0;
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/* hex-specified UCS2 */
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if ((strncmp(s,"U+",2) == 0) &&
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(strspn(s+2,"0123456789abcdefABCDEF") == ls-2))
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{
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sscanf(s+2,"%x",&i);
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if (is_unicode) *is_unicode = 1;
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}
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/* hex-specified byte */
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else if ((ls <= 4) && (strncmp(s,"0x",2) == 0) &&
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(strspn(s+2,"0123456789abcdefABCDEF") == ls-2))
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sscanf(s+2,"%x",&i);
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/* oct-specified number (byte) */
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else if ((*s == '0') &&
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(strspn(s,"01234567") == ls))
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sscanf(s,"%o",&i);
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/* dec-specified number (byte) */
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else if (strspn(s,"0123456789") == ls)
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sscanf(s,"%d",&i);
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/* single-byte quoted char */
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else if ((strlen(s) == 3) && (s[0] == '\'') && (s[2] == '\''))
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i=s[1];
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/* multi-byte UTF8 quoted char */
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else if ((s[0] == '\'') && (s[ls-1] == '\''))
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{
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s[ls-1] = 0; /* ensure we'll not "parse UTF too far" */
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i = utf8_to_ucs2(s+1);
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if (is_unicode) *is_unicode = 1;
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}
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else
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return(-1);
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return(i);
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}
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void saveoldmap(int fd, char *omfil)
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{
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FILE *fp;
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char buf[E_TABSZ];
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#ifdef GIO_UNISCRNMAP
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unicode xbuf[E_TABSZ];
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int is_old_map = 0;
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if (ioctl(fd,GIO_UNISCRNMAP,xbuf))
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{
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perror("GIO_UNISCRNMAP ioctl error");
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#endif
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if (ioctl(fd,GIO_SCRNMAP,buf))
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{
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perror("GIO_SCRNMAP ioctl error");
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exit(1);
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}
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else
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is_old_map = 1;
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#ifdef GIO_UNISCRNMAP
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}
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#endif
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if ((fp = fopen(omfil, "w")) == NULL)
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{
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perror(omfil);
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exit(1);
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}
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#ifdef GIO_UNISCRNMAP
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if (is_old_map)
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{
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#endif
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if (fwrite(buf,E_TABSZ,1,fp) != 1)
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{
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perror("Error writing map to file");
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exit(1);
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}
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#ifdef GIO_UNISCRNMAP
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}
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else
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if (fwrite(xbuf, sizeof(unicode) * E_TABSZ,1,fp) != 1)
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{
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perror("Error writing map to file");
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exit(1);
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}
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#endif
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fclose(fp);
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}
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unicode utf8_to_ucs2 (char* buf)
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{
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int utf_count = 0;
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long utf_char;
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unicode tc;
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unsigned char c;
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do
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{
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c = *buf;
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buf++;
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/* if byte should be part of multi-byte sequence */
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if(c & 0x80)
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{
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/* if we have already started to parse a UTF8 sequence */
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if (utf_count > 0 && (c & 0xc0) == 0x80)
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{
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utf_char = (utf_char << 6) | (c & 0x3f);
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utf_count--;
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if (utf_count == 0)
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tc = utf_char;
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else
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continue;
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}
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else /* Possibly 1st char of a UTF8 sequence */
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{
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if ((c & 0xe0) == 0xc0)
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{
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utf_count = 1;
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utf_char = (c & 0x1f);
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}
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else if ((c & 0xf0) == 0xe0)
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{
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utf_count = 2;
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utf_char = (c & 0x0f);
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}
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else if ((c & 0xf8) == 0xf0)
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{
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utf_count = 3;
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utf_char = (c & 0x07);
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}
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else if ((c & 0xfc) == 0xf8)
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{
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utf_count = 4;
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utf_char = (c & 0x03);
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}
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else if ((c & 0xfe) == 0xfc)
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{
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utf_count = 5;
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utf_char = (c & 0x01);
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}
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else
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utf_count = 0;
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continue;
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}
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}
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else /* not part of multi-byte sequence - treat as ASCII
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* this makes incomplete sequences to be ignored
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*/
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{
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tc = c;
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utf_count = 0;
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}
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}
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while (utf_count);
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return tc;
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}
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