bin/csh/misc.c

   1 /* $NetBSD: misc.c,v 1.20 2013/07/16 17:47:43 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 1.20 2013/07/16 17:47:43 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 = xmalloc((size_t)(n - s) * sizeof(*p));
  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 = xcalloc((size_t)(blklen(v) + 1), sizeof(*newv));
 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 = xmalloc((size_t)(((p - cp) + (q - dp) - 1) * sizeof(*ep)));
 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 = xcalloc((size_t)(blklen(up) + blklen(vp) + 1), sizeof(*wp));
 208     (void)blkcpy(wp, up);
 209     return (blkcat(wp, vp));
 210 }
 211
 212 Char
 213 lastchr(Char *cp)
 214 {
 215     if (!cp)
 216         return (0);
 217     if (!*cp)
 218         return (0);
 219     while (cp[1])
 220         cp++;
 221     return (*cp);
 222 }
 223
 224 /*
 225  * This routine is called after an error to close up
 226  * any units which may have been left open accidentally.
 227  */
 228 void
 229 closem(void)
 230 {
 231     int f;
 232     int nofile;
 233
 234 #ifdef F_CLOSEM
 235     nofile = FOLDSTD + 1;
 236     if (fcntl(nofile, F_CLOSEM, 0) == -1)
 237 #endif
 238         nofile = NOFILE;
 239
 240     for (f = 0; f < nofile; f++)
 241         if (f != SHIN && f != SHOUT && f != SHERR && f != OLDSTD &&
 242             f != FSHTTY)
 243             (void) close(f);
 244 }
 245
 246 void
 247 donefds(void)
 248 {
 249     (void)close(0);
 250     (void)close(1);
 251     (void)close(2);
 252
 253     didfds = 0;
 254 }
 255
 256 /*
 257  * Move descriptor i to j.
 258  * If j is -1 then we just want to get i to a safe place,
 259  * i.e. to a unit > 2.  This also happens in dcopy.
 260  */
 261 int
 262 dmove(int i, int j)
 263 {
 264     if (i == j || i < 0)
 265         return (i);
 266     if (j >= 0) {
 267         (void)dup2(i, j);
 268         if (j != i)
 269             (void)close(i);
 270         return (j);
 271     }
 272     j = dcopy(i, j);
 273     if (j != i)
 274         (void)close(i);
 275     return (j);
 276 }
 277
 278 int
 279 dcopy(int i, int j)
 280 {
 281     if (i == j || i < 0 || (j < 0 && i > 2))
 282         return (i);
 283     if (j >= 0) {
 284         (void)dup2(i, j);
 285         return (j);
 286     }
 287     return (renum(i, j));
 288 }
 289
 290 static int
 291 renum(int i, int j)
 292 {
 293     int k;
 294
 295     k = dup(i);
 296     if (k < 0)
 297         return (-1);
 298     if (j == -1 && k > 2)
 299         return (k);
 300     if (k != j) {
 301         j = renum(k, j);
 302         (void)close(k);
 303         return (j);
 304     }
 305     return (k);
 306 }
 307
 308 /*
 309  * Left shift a command argument list, discarding
 310  * the first c arguments.  Used in "shift" commands
 311  * as well as by commands like "repeat".
 312  */
 313 void
 314 lshift(Char **v, size_t c)
 315 {
 316     Char **u;
 317
 318     for (u = v; *u && c-- > 0; u++)
 319         xfree((ptr_t) *u);
 320     (void)blkcpy(v, u);
 321 }
 322
 323 int
 324 number(Char *cp)
 325 {
 326     if (!cp)
 327         return(0);
 328     if (*cp == '-') {
 329         cp++;
 330         if (!Isdigit(*cp))
 331             return (0);
 332         cp++;
 333     }
 334     while (*cp && Isdigit(*cp))
 335         cp++;
 336     return (*cp == 0);
 337 }
 338
 339 Char **
 340 copyblk(Char **v)
 341 {
 342     Char **nv;
 343
 344     nv = xcalloc((size_t)(blklen(v) + 1), sizeof(*nv));
 345
 346     return (blkcpy(nv, v));
 347 }
 348
 349 #ifndef SHORT_STRINGS
 350 char *
 351 strend(char *cp)
 352 {
 353     if (!cp)
 354         return (cp);
 355     while (*cp)
 356         cp++;
 357     return (cp);
 358 }
 359
 360 #endif /* SHORT_STRINGS */
 361
 362 Char *
 363 strip(Char *cp)
 364 {
 365     Char *dp;
 366
 367     dp = cp;
 368     if (!cp)
 369         return (cp);
 370     while ((*dp++ &= TRIM) != '\0')
 371         continue;
 372     return (cp);
 373 }
 374
 375 Char *
 376 quote(Char *cp)
 377 {
 378     Char *dp;
 379
 380     dp = cp;
 381     if (!cp)
 382         return (cp);
 383     while (*dp != '\0')
 384         *dp++ |= QUOTE;
 385     return (cp);
 386 }
 387
 388 void
 389 udvar(Char *name)
 390 {
 391     setname(vis_str(name));
 392     stderror(ERR_NAME | ERR_UNDVAR);
 393     /* NOTREACHED */
 394 }
 395
 396 int
 397 prefix(Char *sub, Char *str)
 398 {
 399     for (;;) {
 400         if (*sub == 0)
 401             return (1);
 402         if (*str == 0)
 403             return (0);
 404         if (*sub++ != *str++)
 405             return (0);
 406     }
 407 }