bin/csh/misc.c

   1 /* $NetBSD: misc.c,v 1.18 2006/03/17 22:48:10 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1980, 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)misc.c      8.1 (Berkeley) 5/31/93";
  36 #else
  37 __RCSID("$NetBSD: misc.c,v 1.18 2006/03/17 22:48:10 christos Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/param.h>
  42
  43 #include <stdarg.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include <fcntl.h>
  48
  49 #include "csh.h"
  50 #include "extern.h"
  51
  52 static int renum(int, int);
  53
  54 int
  55 any(const char *s, int c)
  56 {
  57     if (!s)
  58         return (0);             /* Check for nil pointer */
  59     while (*s)
  60         if (*s++ == c)
  61             return (1);
  62     return (0);
  63 }
  64
  65 char *
  66 strsave(const char *s)
  67 {
  68     const char *n;
  69     char *p, *r;
  70
  71     if (s == NULL)
  72         s = "";
  73     for (n = s; *n++;)
  74         continue;
  75     r = p = (char *)xmalloc((size_t)((n - s) * sizeof(char)));
  76     while ((*p++ = *s++) != '\0')
  77         continue;
  78     return (r);
  79 }
  80
  81 Char **
  82 blkend(Char **up)
  83 {
  84     while (*up)
  85         up++;
  86     return (up);
  87 }
  88
  89
  90 void
  91 blkpr(FILE *fp, Char **av)
  92 {
  93     for (; *av; av++) {
  94         (void)fprintf(fp, "%s", vis_str(*av));
  95         if (av[1])
  96             (void)fprintf(fp, " ");
  97     }
  98 }
  99
 100 int
 101 blklen(Char **av)
 102 {
 103     int i;
 104
 105     i = 0;
 106     while (*av++)
 107         i++;
 108     return (i);
 109 }
 110
 111 Char **
 112 blkcpy(Char **oav, Char **bv)
 113 {
 114     Char **av;
 115
 116     av = oav;
 117     while ((*av++ = *bv++) != NULL)
 118         continue;
 119     return (oav);
 120 }
 121
 122 Char **
 123 blkcat(Char **up, Char **vp)
 124 {
 125     (void)blkcpy(blkend(up), vp);
 126     return (up);
 127 }
 128
 129 void
 130 blkfree(Char **av0)
 131 {
 132     Char **av;
 133
 134     av = av0;
 135     if (!av0)
 136         return;
 137     for (; *av; av++)
 138         xfree((ptr_t) * av);
 139     xfree((ptr_t) av0);
 140 }
 141
 142 Char **
 143 saveblk(Char **v)
 144 {
 145     Char **newv, **onewv;
 146
 147     if (v == NULL)
 148         return NULL;
 149
 150     newv = (Char **)xcalloc((size_t)(blklen(v) + 1), sizeof(Char **));
 151     onewv = newv;
 152     while (*v)
 153         *newv++ = Strsave(*v++);
 154     return (onewv);
 155 }
 156
 157 #ifdef NOTUSED
 158 char *
 159 strstr(char *s, char *t)
 160 {
 161     do {
 162         char *ss;
 163         char *tt;
 164
 165         ss = s;
 166         tt = t;
 167
 168         do
 169             if (*tt == '\0')
 170                 return (s);
 171         while (*ss++ == *tt++);
 172     } while (*s++ != '\0');
 173     return (NULL);
 174 }
 175
 176 #endif /* NOTUSED */
 177
 178 #ifndef SHORT_STRINGS
 179 char *
 180 strspl(char *cp, char *dp)
 181 {
 182     char *ep, *p, *q;
 183
 184     if (!cp)
 185         cp = "";
 186     if (!dp)
 187         dp = "";
 188     for (p = cp; *p++;)
 189         continue;
 190     for (q = dp; *q++;)
 191         continue;
 192     ep = (char *) xmalloc((size_t)(((p - cp) + (q - dp) - 1) * sizeof(char)));
 193     for (p = ep, q = cp; *p++ = *q++;)
 194         continue;
 195     for (p--, q = dp; *p++ = *q++;)
 196         continue;
 197     return (ep);
 198 }
 199
 200 #endif
 201
 202 Char **
 203 blkspl(Char **up, Char **vp)
 204 {
 205     Char **wp;
 206
 207     wp = (Char **)xcalloc((size_t)(blklen(up) + blklen(vp) + 1),
 208         sizeof(Char **));
 209     (void)blkcpy(wp, up);
 210     return (blkcat(wp, vp));
 211 }
 212
 213 Char
 214 lastchr(Char *cp)
 215 {
 216     if (!cp)
 217         return (0);
 218     if (!*cp)
 219         return (0);
 220     while (cp[1])
 221         cp++;
 222     return (*cp);
 223 }
 224
 225 /*
 226  * This routine is called after an error to close up
 227  * any units which may have been left open accidentally.
 228  */
 229 void
 230 closem(void)
 231 {
 232     int f;
 233     int nofile;
 234
 235 #ifdef F_CLOSEM
 236     nofile = FOLDSTD + 1;
 237     if (fcntl(nofile, F_CLOSEM, 0) == -1)
 238 #endif
 239         nofile = NOFILE;
 240
 241     for (f = 0; f < nofile; f++)
 242         if (f != SHIN && f != SHOUT && f != SHERR && f != OLDSTD &&
 243             f != FSHTTY)
 244             (void) close(f);
 245 }
 246
 247 void
 248 donefds(void)
 249 {
 250     (void)close(0);
 251     (void)close(1);
 252     (void)close(2);
 253
 254     didfds = 0;
 255 }
 256
 257 /*
 258  * Move descriptor i to j.
 259  * If j is -1 then we just want to get i to a safe place,
 260  * i.e. to a unit > 2.  This also happens in dcopy.
 261  */
 262 int
 263 dmove(int i, int j)
 264 {
 265     if (i == j || i < 0)
 266         return (i);
 267     if (j >= 0) {
 268         (void)dup2(i, j);
 269         if (j != i)
 270             (void)close(i);
 271         return (j);
 272     }
 273     j = dcopy(i, j);
 274     if (j != i)
 275         (void)close(i);
 276     return (j);
 277 }
 278
 279 int
 280 dcopy(int i, int j)
 281 {
 282     if (i == j || i < 0 || (j < 0 && i > 2))
 283         return (i);
 284     if (j >= 0) {
 285         (void)dup2(i, j);
 286         return (j);
 287     }
 288     return (renum(i, j));
 289 }
 290
 291 static int
 292 renum(int i, int j)
 293 {
 294     int k;
 295
 296     k = dup(i);
 297     if (k < 0)
 298         return (-1);
 299     if (j == -1 && k > 2)
 300         return (k);
 301     if (k != j) {
 302         j = renum(k, j);
 303         (void)close(k);
 304         return (j);
 305     }
 306     return (k);
 307 }
 308
 309 /*
 310  * Left shift a command argument list, discarding
 311  * the first c arguments.  Used in "shift" commands
 312  * as well as by commands like "repeat".
 313  */
 314 void
 315 lshift(Char **v, int c)
 316 {
 317     Char **u;
 318
 319     for (u = v; *u && --c >= 0; u++)
 320         xfree((ptr_t) *u);
 321     (void)blkcpy(v, u);
 322 }
 323
 324 int
 325 number(Char *cp)
 326 {
 327     if (!cp)
 328         return(0);
 329     if (*cp == '-') {
 330         cp++;
 331         if (!Isdigit(*cp))
 332             return (0);
 333         cp++;
 334     }
 335     while (*cp && Isdigit(*cp))
 336         cp++;
 337     return (*cp == 0);
 338 }
 339
 340 Char **
 341 copyblk(Char **v)
 342 {
 343     Char **nv;
 344
 345     nv = (Char **)xcalloc((size_t)(blklen(v) + 1), sizeof(Char **));
 346
 347     return (blkcpy(nv, v));
 348 }
 349
 350 #ifndef SHORT_STRINGS
 351 char *
 352 strend(char *cp)
 353 {
 354     if (!cp)
 355         return (cp);
 356     while (*cp)
 357         cp++;
 358     return (cp);
 359 }
 360
 361 #endif /* SHORT_STRINGS */
 362
 363 Char *
 364 strip(Char *cp)
 365 {
 366     Char *dp;
 367
 368     dp = cp;
 369     if (!cp)
 370         return (cp);
 371     while ((*dp++ &= TRIM) != '\0')
 372         continue;
 373     return (cp);
 374 }
 375
 376 Char *
 377 quote(Char *cp)
 378 {
 379     Char *dp;
 380
 381     dp = cp;
 382     if (!cp)
 383         return (cp);
 384     while (*dp != '\0')
 385         *dp++ |= QUOTE;
 386     return (cp);
 387 }
 388
 389 void
 390 udvar(Char *name)
 391 {
 392     setname(vis_str(name));
 393     stderror(ERR_NAME | ERR_UNDVAR);
 394     /* NOTREACHED */
 395 }
 396
 397 int
 398 prefix(Char *sub, Char *str)
 399 {
 400     for (;;) {
 401         if (*sub == 0)
 402             return (1);
 403         if (*str == 0)
 404             return (0);
 405         if (*sub++ != *str++)
 406             return (0);
 407     }
 408 }