aboutsummaryrefslogtreecommitdiff
path: root/a8cat.c
blob: e4a88bb3e351dd5e5ae2b1606fad66f37601bafc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <locale.h>
#include <wchar.h>
#include <errno.h>

#include "atables.h"
#include "wtable.h"

const char **table = ata2utf;

/* XXX: hard-coded ANSI/vt100 escape sequences. would be
   better but more complex to use terminfo to support any ol'
   terminal... */
const char *inverse_on  = "\x1b[7m";
const char *inverse_off = "\x1b[0m";

int verbose = 0;
int underline = 0, reverse = 0, textmode = 0, ics = 0;
int magazine = 0, stripinv = 0;

const char *self;

void set_self(const char *argv0) {
   char *p;

   self = argv0;
   p = strrchr(self, '/');
   if(p) self = p + 1;
}

void die(const char *msg) {
   fprintf(stderr, "%s: %s\n", self, msg);
   exit(1);
}

void print_help(void) {
	printf("Usage: %s [-i] [-u] [file ...]\n", self);
}

FILE *open_input(const char *file) {
	FILE *input;

	if(file[0] == '-' && file[1] == 0) {
		if(verbose)
			fprintf(stderr, "%s: reading from standard input.\n", self);
		if(freopen(NULL, "rb", stdin)) {
			input = stdin;
		} else {
			perror("(standard input)");
			return NULL;
		}
	} else if(!(input = fopen(file, "rb"))) {
		perror(file);
		return NULL;
	}

	if(verbose)
		fprintf(stderr, "%s: reading from file '%s'.\n", self, file);

	return input;
}

int handle_escape_seq(int inv, FILE *input, const char *file, int line) {
	int count, c;
	char buf[5] = { 0x1b, 0, 0, 0, 0 };

	for(count = 1; count < 4; count++) {
		c = fgetwc(input);
		if(c == WEOF) break;
		buf[count] = c; /* FIXME: might be a wide char! */
	}

	if(strcmp(inverse_on, buf) == 0) {
		return 0x80;
	} else if(strcmp(inverse_off, buf) == 0) {
		return 0;
	} else {
		fprintf(stderr, "%s: warning: %s:%d: unrecognized ANSI escape sequence.\n", self, file, line);
		fputs(buf, stdout);
		return inv;
	}
}

int a8revcat(const char *file) {
	FILE *input;
	int c, d, inv = 0, line = 1;

	if( !(input = open_input(file)) )
		return 1;

	while( (c = fgetwc(input)) != WEOF ) {
		if(c == 0x1b) {
			inv = handle_escape_seq(inv, input, file, line);
		} else if(c == '\n') {
			putchar(0x9b);
			line++;
		} else if(c == '\t') {
			putchar(0x7f);
		} else if(c == '\b' || c == 0x7f) {
			putchar(0x7e);
		} else if(c == '\a') {
			putchar(0xfd);
		} else if(c < 0x80) {
			putchar(c | inv);
		} else {
			d = wchar2atascii(c, ics);
			if(d == -1) {
				fprintf(stderr, "%s: warning: %s:%d: unrecognized Unicode character %04x.\n", self, file, line, c);
			} else {
				putchar(d | inv);
			}
		}
	}

	if(verbose)
		fprintf(stderr, "%s: %s: converted %d lines, closing file.\n", self, file, line - 1);

	fclose(input);
	return 0;
}

void inverse(int onoff) {
	fputs((onoff ? inverse_on : inverse_off ), stdout);
}

int a8cat(const char *file) {
	FILE *input;
	int c, inv = 0, line = 1;

	if( !(input = open_input(file)) )
		return 1;

	while( (c = fgetc(input)) != EOF ) {
		if(c == 0x9b) {
			putchar('\n');
			line++;
			continue;
		}

		if(stripinv) c &= 0x7f;

		if(textmode) {
			switch(c) {
				case 0x7f: /* tab */
					putchar('\t');
					continue;
				case 0xfd: /* bell */
					putchar('\a');
					continue;
				case 0x7e: /* backspace */
					putchar('\b');
					continue;
				default: break;
			}
		}

		if(!underline) {
			/* strings of inverse chars only get one "inverse on" ANSI
			   sequence, and one "inverse off" afterwards. */
			if(c & 0x80) {
				if(!inv) {
					inv = 1;
					if(magazine)
						fputs("{inv}", stdout);
					else
						inverse(1);
				}
			} else {
				if(inv) {
					inv = 0;
					if(magazine)
						fputs("{norm}", stdout);
					else
						inverse(0);
				}
			}
		}

		if(magazine) {
			/* special cases: control codes with bit 7 set can't go
			   in the table since it's only got 128 entries. */
			switch(c) {
				case 0x9c:
					fputs("{del-line}", stdout); continue;
				case 0x9d:
					fputs("{ins-line}", stdout); continue;
				case 0x9e:
					fputs("{clr-tab}", stdout); continue;
				case 0x9f:
					fputs("{set-tab}", stdout); continue;
				case 0xfd:
					fputs("{bell}", stdout); continue;
				case 0xfe:
					fputs("{del-char}", stdout); continue;
				case 0xff:
					fputs("{ins-char}", stdout); continue;
			}
		}

		fputs(table[c & 0x7f], stdout);

		if(underline && (c & 0x80)) {
			putchar('\b');
			putchar('_');
		}
	}

	/* gotta turn off inverse, so if there's another file after this one,
	   it doesn't start out being printed in inverse. */
	if(inv && !underline) {
		if(magazine)
			fputs("{norm}", stdout);
		else
			inverse(0);
	}

	if(verbose)
		fprintf(stderr, "%s: %s: converted %d lines, closing file.\n", self, file, line - 1);

	fclose(input);
	return 0;
}

int main(int argc, char **argv) {
	int opt, result = 0;

	set_self(argv[0]);

	if(argc > 1 && strcmp(argv[1], "--help") == 0) {
		print_help();
		exit(0);
	}

	if(argc > 1 && strcmp(argv[1], "--version") == 0) {
		printf("%s %s\n", self, VERSION);
		exit(0);
	}

	while( (opt = getopt(argc, argv, "ihurtmsv")) != -1) {
		switch(opt) {
			case 'i': table = ics2utf; ics = 1; break;
			case 'h': print_help(); exit(0); break;
			case 'u': underline = 1; break;
			case 'r': reverse = 1; break;
			case 't': textmode = 1; break;
			case 'm': table = ata2mag; magazine = 1; break;
			case 's': stripinv = 1; break;
			case 'v': verbose = 1; break;
			default: print_help(); exit(1); break;
		}
	}

	if(reverse) {
		if(underline || textmode || stripinv || magazine) {
			die("-t, -u, -m, -s options don't make sense with -r.\n");
		}
		/* the language_country part of the locale doesn't matter,
         since we aren't doing localization. the encoding *has*
         to be UTF-8. */
		setlocale(LC_CTYPE, "en_US.UTF-8");
	}

	if(magazine) {
		if(ics || stripinv || underline) {
			die("-i, -s, -u options don't make sense with -m.\n");
		}
	}

	if(optind >= argc) {
		result = (reverse ? a8revcat("-") : a8cat("-"));
	} else {
		while(optind < argc) {
			result += (reverse ? a8revcat(argv[optind]) : a8cat(argv[optind]));
			optind++;
		}
	}

	exit(result);
}