| 1 | # include <stdio.h> |
| 2 | |
| 3 | # define PL 256 |
| 4 | # define ESC '\033' |
| 5 | # define RLF '\013' |
| 6 | # define SI '\017' |
| 7 | # define SO '\016' |
| 8 | # define GREEK 0200 |
| 9 | # define LINELN 800 |
| 10 | |
| 11 | char *page[PL]; |
| 12 | char lbuff [LINELN], *line; |
| 13 | int bflag, xflag, fflag; |
| 14 | int half; |
| 15 | int cp, lp; |
| 16 | int ll, llh, mustwr; |
| 17 | int pcp = 0; |
| 18 | char *pgmname; |
| 19 | char *strcpy(); |
| 20 | |
| 21 | main (argc, argv) |
| 22 | int argc; char **argv; |
| 23 | { |
| 24 | int i; |
| 25 | int greek; |
| 26 | register int c; |
| 27 | char fbuff[BUFSIZ]; |
| 28 | |
| 29 | setbuf (stdout, fbuff); |
| 30 | pgmname = argv[0]; |
| 31 | |
| 32 | for (i = 1; i < argc; i++) { |
| 33 | register char *p; |
| 34 | if (*argv[i] != '-') { |
| 35 | fprintf (stderr, "%s: bad option %s\n", |
| 36 | pgmname, argv[i]); |
| 37 | exit (2); |
| 38 | } |
| 39 | for (p = argv[i]+1; *p; p++) { |
| 40 | switch (*p) { |
| 41 | case 'b': |
| 42 | bflag++; |
| 43 | break; |
| 44 | |
| 45 | case 'x': |
| 46 | xflag++; |
| 47 | break; |
| 48 | |
| 49 | case 'f': |
| 50 | fflag++; |
| 51 | break; |
| 52 | |
| 53 | default: |
| 54 | fprintf (stderr, "%s: bad option letter %c\n", |
| 55 | pgmname, *p); |
| 56 | exit (2); |
| 57 | } |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | for (ll=0; ll<PL; ll++) |
| 62 | page[ll] = 0; |
| 63 | |
| 64 | cp = 0; |
| 65 | ll = 0; |
| 66 | greek = 0; |
| 67 | mustwr = PL; |
| 68 | line = lbuff; |
| 69 | |
| 70 | while ((c = getchar()) != EOF) { |
| 71 | switch (c) { |
| 72 | case '\n': |
| 73 | incr(); |
| 74 | incr(); |
| 75 | cp = 0; |
| 76 | continue; |
| 77 | |
| 78 | case '\0': |
| 79 | continue; |
| 80 | |
| 81 | case ESC: |
| 82 | c = getchar(); |
| 83 | switch (c) { |
| 84 | case '7': /* reverse full line feed */ |
| 85 | decr(); |
| 86 | decr(); |
| 87 | break; |
| 88 | |
| 89 | case '8': /* reverse half line feed */ |
| 90 | if (fflag) |
| 91 | decr(); |
| 92 | else { |
| 93 | if (--half < -1) { |
| 94 | decr(); |
| 95 | decr(); |
| 96 | half += 2; |
| 97 | } |
| 98 | } |
| 99 | break; |
| 100 | |
| 101 | case '9': /* forward half line feed */ |
| 102 | if (fflag) |
| 103 | incr(); |
| 104 | else { |
| 105 | if (++half > 0) { |
| 106 | incr(); |
| 107 | incr(); |
| 108 | half -= 2; |
| 109 | } |
| 110 | } |
| 111 | break; |
| 112 | } |
| 113 | continue; |
| 114 | |
| 115 | case SO: |
| 116 | greek = GREEK; |
| 117 | continue; |
| 118 | |
| 119 | case SI: |
| 120 | greek = 0; |
| 121 | continue; |
| 122 | |
| 123 | case RLF: |
| 124 | decr(); |
| 125 | decr(); |
| 126 | continue; |
| 127 | |
| 128 | case '\r': |
| 129 | cp = 0; |
| 130 | continue; |
| 131 | |
| 132 | case '\t': |
| 133 | cp = (cp + 8) & -8; |
| 134 | continue; |
| 135 | |
| 136 | case '\b': |
| 137 | if (cp > 0) |
| 138 | cp--; |
| 139 | continue; |
| 140 | |
| 141 | case ' ': |
| 142 | cp++; |
| 143 | continue; |
| 144 | |
| 145 | default: |
| 146 | c &= 0177; |
| 147 | if (c > 040 && c < 0177) { /* if printable */ |
| 148 | outc(c | greek); |
| 149 | cp++; |
| 150 | } |
| 151 | continue; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | for (i=0; i<PL; i++) |
| 156 | if (page[(mustwr+i)%PL] != 0) |
| 157 | emit (page[(mustwr+i) % PL], mustwr+i-PL); |
| 158 | emit (" ", (llh + 1) & -2); |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | outc (c) |
| 163 | register char c; |
| 164 | { |
| 165 | if (lp > cp) { |
| 166 | line = lbuff; |
| 167 | lp = 0; |
| 168 | } |
| 169 | |
| 170 | while (lp < cp) { |
| 171 | switch (*line) { |
| 172 | case '\0': |
| 173 | *line = ' '; |
| 174 | lp++; |
| 175 | break; |
| 176 | |
| 177 | case '\b': |
| 178 | lp--; |
| 179 | break; |
| 180 | |
| 181 | default: |
| 182 | lp++; |
| 183 | } |
| 184 | line++; |
| 185 | } |
| 186 | while (*line == '\b') { |
| 187 | line += 2; |
| 188 | } |
| 189 | if (bflag || *line == '\0' || *line == ' ') |
| 190 | *line = c; |
| 191 | else { |
| 192 | register char c1, c2, c3; |
| 193 | c1 = *++line; |
| 194 | *line++ = '\b'; |
| 195 | c2 = *line; |
| 196 | *line++ = c; |
| 197 | while (c1) { |
| 198 | c3 = *line; |
| 199 | *line++ = c1; |
| 200 | c1 = c2; |
| 201 | c2 = c3; |
| 202 | } |
| 203 | lp = 0; |
| 204 | line = lbuff; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | store (lno) |
| 209 | { |
| 210 | char *malloc(); |
| 211 | |
| 212 | lno %= PL; |
| 213 | if (page[lno] != 0) |
| 214 | free (page[lno]); |
| 215 | page[lno] = malloc((unsigned)strlen(lbuff) + 2); |
| 216 | if (page[lno] == 0) { |
| 217 | fprintf (stderr, "%s: no storage\n", pgmname); |
| 218 | exit (2); |
| 219 | } |
| 220 | strcpy (page[lno],lbuff); |
| 221 | } |
| 222 | |
| 223 | fetch(lno) |
| 224 | { |
| 225 | register char *p; |
| 226 | |
| 227 | lno %= PL; |
| 228 | p = lbuff; |
| 229 | while (*p) |
| 230 | *p++ = '\0'; |
| 231 | line = lbuff; |
| 232 | lp = 0; |
| 233 | if (page[lno]) |
| 234 | strcpy (line, page[lno]); |
| 235 | } |
| 236 | emit (s, lineno) |
| 237 | char *s; |
| 238 | int lineno; |
| 239 | { |
| 240 | static int cline = 0; |
| 241 | register int ncp; |
| 242 | register char *p; |
| 243 | static int gflag = 0; |
| 244 | |
| 245 | if (*s) { |
| 246 | if (gflag) { |
| 247 | putchar (SI); |
| 248 | gflag = 0; |
| 249 | } |
| 250 | while (cline < lineno - 1) { |
| 251 | putchar ('\n'); |
| 252 | pcp = 0; |
| 253 | cline += 2; |
| 254 | } |
| 255 | if (cline != lineno) { |
| 256 | putchar (ESC); |
| 257 | putchar ('9'); |
| 258 | cline++; |
| 259 | } |
| 260 | if (pcp) |
| 261 | putchar ('\r'); |
| 262 | pcp = 0; |
| 263 | p = s; |
| 264 | while (*p) { |
| 265 | ncp = pcp; |
| 266 | while (*p++ == ' ') { |
| 267 | if ((++ncp & 7) == 0 && !xflag) { |
| 268 | pcp = ncp; |
| 269 | putchar ('\t'); |
| 270 | } |
| 271 | } |
| 272 | if (!*--p) |
| 273 | break; |
| 274 | while (pcp < ncp) { |
| 275 | putchar (' '); |
| 276 | pcp++; |
| 277 | } |
| 278 | if (gflag != (*p & GREEK) && *p != '\b') { |
| 279 | if (gflag) |
| 280 | putchar (SI); |
| 281 | else |
| 282 | putchar (SO); |
| 283 | gflag ^= GREEK; |
| 284 | } |
| 285 | putchar (*p & ~GREEK); |
| 286 | if (*p++ == '\b') |
| 287 | pcp--; |
| 288 | else |
| 289 | pcp++; |
| 290 | } |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | incr() |
| 295 | { |
| 296 | store (ll++); |
| 297 | if (ll > llh) |
| 298 | llh = ll; |
| 299 | if (ll >= mustwr && page[ll%PL]) { |
| 300 | emit (page[ll%PL], ll - PL); |
| 301 | mustwr++; |
| 302 | free (page[ll%PL]); |
| 303 | page[ll%PL] = 0; |
| 304 | } |
| 305 | fetch (ll); |
| 306 | } |
| 307 | |
| 308 | decr() |
| 309 | { |
| 310 | if (ll > mustwr - PL) { |
| 311 | store (ll--); |
| 312 | fetch (ll); |
| 313 | } |
| 314 | } |