| 1 | static char *sccsid = "@(#)misc.c 4.1 %G%"; |
| 2 | |
| 3 | #include "sh.h" |
| 4 | |
| 5 | /* |
| 6 | * C Shell |
| 7 | */ |
| 8 | |
| 9 | letter(c) |
| 10 | register char c; |
| 11 | { |
| 12 | |
| 13 | return (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c == '_'); |
| 14 | } |
| 15 | |
| 16 | digit(c) |
| 17 | register char c; |
| 18 | { |
| 19 | |
| 20 | return (c >= '0' && c <= '9'); |
| 21 | } |
| 22 | |
| 23 | alnum(c) |
| 24 | register char c; |
| 25 | { |
| 26 | return (letter(c) || digit(c)); |
| 27 | } |
| 28 | |
| 29 | any(c, s) |
| 30 | register int c; |
| 31 | register char *s; |
| 32 | { |
| 33 | |
| 34 | while (*s) |
| 35 | if (*s++ == c) |
| 36 | return(1); |
| 37 | return(0); |
| 38 | } |
| 39 | |
| 40 | char * |
| 41 | calloc(i, j) |
| 42 | register unsigned i; |
| 43 | unsigned j; |
| 44 | { |
| 45 | register char *cp, *dp; |
| 46 | #ifdef debug |
| 47 | static char *av[2] = {0, 0}; |
| 48 | #endif |
| 49 | |
| 50 | i *= j; |
| 51 | cp = (char *) malloc(i); |
| 52 | if (cp == 0) { |
| 53 | child++; |
| 54 | #ifndef debug |
| 55 | error("Out of memory"); |
| 56 | #else |
| 57 | showall(av); |
| 58 | printf("i=%d, j=%d: ", i/j, j); |
| 59 | printf("Out of memory\n"); |
| 60 | chdir("/usr/bill/cshcore"); |
| 61 | abort(); |
| 62 | #endif |
| 63 | } |
| 64 | dp = cp; |
| 65 | if (i != 0) |
| 66 | do |
| 67 | *dp++ = 0; |
| 68 | while (--i); |
| 69 | return (cp); |
| 70 | } |
| 71 | |
| 72 | cfree(p) |
| 73 | char *p; |
| 74 | { |
| 75 | |
| 76 | free(p); |
| 77 | } |
| 78 | |
| 79 | char ** |
| 80 | blkend(up) |
| 81 | register char **up; |
| 82 | { |
| 83 | |
| 84 | while (*up) |
| 85 | up++; |
| 86 | return (up); |
| 87 | } |
| 88 | |
| 89 | blkpr(av) |
| 90 | register char **av; |
| 91 | { |
| 92 | |
| 93 | for (; *av; av++) { |
| 94 | printf("%s", *av); |
| 95 | if (av[1]) |
| 96 | printf(" "); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | blklen(av) |
| 101 | register char **av; |
| 102 | { |
| 103 | register int i = 0; |
| 104 | |
| 105 | while (*av++) |
| 106 | i++; |
| 107 | return (i); |
| 108 | } |
| 109 | |
| 110 | char ** |
| 111 | blkcpy(oav, bv) |
| 112 | char **oav; |
| 113 | register char **bv; |
| 114 | { |
| 115 | register char **av = oav; |
| 116 | |
| 117 | while (*av++ = *bv++) |
| 118 | continue; |
| 119 | return (oav); |
| 120 | } |
| 121 | |
| 122 | char ** |
| 123 | blkcat(up, vp) |
| 124 | char **up, **vp; |
| 125 | { |
| 126 | |
| 127 | blkcpy(blkend(up), vp); |
| 128 | return (up); |
| 129 | } |
| 130 | |
| 131 | blkfree(av0) |
| 132 | char **av0; |
| 133 | { |
| 134 | register char **av = av0; |
| 135 | |
| 136 | while (*av) |
| 137 | xfree(*av++); |
| 138 | xfree((char *)av0); |
| 139 | } |
| 140 | |
| 141 | char ** |
| 142 | saveblk(v) |
| 143 | register char **v; |
| 144 | { |
| 145 | register int len = blklen(v) + 1; |
| 146 | register char **newv = (char **) calloc(len, sizeof (char **)); |
| 147 | char **onewv = newv; |
| 148 | |
| 149 | while (*v) |
| 150 | *newv++ = savestr(*v++); |
| 151 | return (onewv); |
| 152 | } |
| 153 | |
| 154 | char * |
| 155 | strspl(cp, dp) |
| 156 | register char *cp, *dp; |
| 157 | { |
| 158 | register char *ep = calloc(1, strlen(cp) + strlen(dp) + 1); |
| 159 | |
| 160 | strcpy(ep, cp); |
| 161 | strcat(ep, dp); |
| 162 | return (ep); |
| 163 | } |
| 164 | |
| 165 | char ** |
| 166 | blkspl(up, vp) |
| 167 | register char **up, **vp; |
| 168 | { |
| 169 | register char **wp = (char **) calloc(blklen(up) + blklen(vp) + 1, sizeof (char **)); |
| 170 | |
| 171 | blkcpy(wp, up); |
| 172 | return (blkcat(wp, vp)); |
| 173 | } |
| 174 | |
| 175 | lastchr(cp) |
| 176 | register char *cp; |
| 177 | { |
| 178 | |
| 179 | if (!*cp) |
| 180 | return (0); |
| 181 | while (cp[1]) |
| 182 | cp++; |
| 183 | return (*cp); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * This routine is called after an error to close up |
| 188 | * any units which may have been left open accidentally. |
| 189 | */ |
| 190 | closem() |
| 191 | { |
| 192 | register int f; |
| 193 | |
| 194 | for (f = 0; f < NOFILE; f++) |
| 195 | if (f != SHIN && f != SHOUT && f != SHDIAG && f != OLDSTD && |
| 196 | f != FSHTTY) |
| 197 | close(f); |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | * Close files before executing a file. |
| 202 | * We could be MUCH more intelligent, since (on a version 7 system) |
| 203 | * we need only close files here during a source, the other |
| 204 | * shell fd's being in units 16-19 which are closed automatically! |
| 205 | */ |
| 206 | closech() |
| 207 | { |
| 208 | register int f; |
| 209 | |
| 210 | if (didcch) |
| 211 | return; |
| 212 | didcch = 1; |
| 213 | SHIN = 0; SHOUT = 1; SHDIAG = 2; OLDSTD = 0; |
| 214 | for (f = 3; f < NOFILE; f++) |
| 215 | close(f); |
| 216 | } |
| 217 | |
| 218 | donefds() |
| 219 | { |
| 220 | |
| 221 | close(0), close(1), close(2); |
| 222 | didfds = 0; |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * Move descriptor i to j. |
| 227 | * If j is -1 then we just want to get i to a safe place, |
| 228 | * i.e. to a unit > 2. This also happens in dcopy. |
| 229 | */ |
| 230 | dmove(i, j) |
| 231 | register int i, j; |
| 232 | { |
| 233 | |
| 234 | if (i == j || i < 0) |
| 235 | return (i); |
| 236 | #ifdef V7 |
| 237 | if (j >= 0) { |
| 238 | dup2(i, j); |
| 239 | return (j); |
| 240 | } else |
| 241 | #endif |
| 242 | j = dcopy(i, j); |
| 243 | if (j != i) |
| 244 | close(i); |
| 245 | return (j); |
| 246 | } |
| 247 | |
| 248 | dcopy(i, j) |
| 249 | register int i, j; |
| 250 | { |
| 251 | |
| 252 | if (i == j || i < 0 || j < 0 && i > 2) |
| 253 | return (i); |
| 254 | #ifdef V7 |
| 255 | if (j >= 0) { |
| 256 | dup2(i, j); |
| 257 | return (j); |
| 258 | } |
| 259 | #endif |
| 260 | close(j); |
| 261 | return (renum(i, j)); |
| 262 | } |
| 263 | |
| 264 | renum(i, j) |
| 265 | register int i, j; |
| 266 | { |
| 267 | register int k = dup(i); |
| 268 | |
| 269 | if (k < 0) |
| 270 | return (-1); |
| 271 | if (j == -1 && k > 2) |
| 272 | return (k); |
| 273 | if (k != j) { |
| 274 | j = renum(k, j); |
| 275 | close(k); |
| 276 | return (j); |
| 277 | } |
| 278 | return (k); |
| 279 | } |
| 280 | |
| 281 | copy(to, from, size) |
| 282 | register char *to, *from; |
| 283 | register int size; |
| 284 | { |
| 285 | |
| 286 | if (size) |
| 287 | do |
| 288 | *to++ = *from++; |
| 289 | while (--size != 0); |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * Left shift a command argument list, discarding |
| 294 | * the first c arguments. Used in "shift" commands |
| 295 | * as well as by commands like "repeat". |
| 296 | */ |
| 297 | lshift(v, c) |
| 298 | register char **v; |
| 299 | register int c; |
| 300 | { |
| 301 | register char **u = v; |
| 302 | |
| 303 | while (*u && --c >= 0) |
| 304 | xfree(*u++); |
| 305 | blkcpy(v, u); |
| 306 | } |
| 307 | |
| 308 | number(cp) |
| 309 | char *cp; |
| 310 | { |
| 311 | |
| 312 | if (*cp == '-') { |
| 313 | cp++; |
| 314 | if (!digit(*cp++)) |
| 315 | return (0); |
| 316 | } |
| 317 | while (*cp && digit(*cp)) |
| 318 | cp++; |
| 319 | return (*cp == 0); |
| 320 | } |
| 321 | |
| 322 | char ** |
| 323 | copyblk(v) |
| 324 | register char **v; |
| 325 | { |
| 326 | register char **nv = (char **) calloc(blklen(v) + 1, sizeof (char **)); |
| 327 | |
| 328 | return (blkcpy(nv, v)); |
| 329 | } |
| 330 | |
| 331 | char * |
| 332 | strend(cp) |
| 333 | register char *cp; |
| 334 | { |
| 335 | |
| 336 | while (*cp) |
| 337 | cp++; |
| 338 | return (cp); |
| 339 | } |
| 340 | |
| 341 | char * |
| 342 | strip(cp) |
| 343 | char *cp; |
| 344 | { |
| 345 | register char *dp = cp; |
| 346 | |
| 347 | while (*dp++ &= TRIM) |
| 348 | continue; |
| 349 | return (cp); |
| 350 | } |
| 351 | |
| 352 | udvar(name) |
| 353 | char *name; |
| 354 | { |
| 355 | |
| 356 | setname(name); |
| 357 | bferr("Undefined variable"); |
| 358 | } |
| 359 | |
| 360 | prefix(sub, str) |
| 361 | register char *sub, *str; |
| 362 | { |
| 363 | |
| 364 | for (;;) { |
| 365 | if (*sub == 0) |
| 366 | return (1); |
| 367 | if (*str == 0) |
| 368 | return (0); |
| 369 | if (*sub++ != *str++) |
| 370 | return (0); |
| 371 | } |
| 372 | } |