Jari Aalto | ccc6cda | 1996-12-23 17:02:34 +0000 | [diff] [blame] | 1 | /* oslib.c - functions present only in some unix versions. */ |
| 2 | |
| 3 | /* Copyright (C) 1995 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Bash, the Bourne Again SHell. |
| 6 | |
| 7 | Bash is free software; you can redistribute it and/or modify it under |
| 8 | the terms of the GNU General Public License as published by the Free |
| 9 | Software Foundation; either version 2, or (at your option) any later |
| 10 | version. |
| 11 | |
| 12 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY |
| 13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 15 | for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License along |
| 18 | with Bash; see the file COPYING. If not, write to the Free Software |
| 19 | Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | #include "config.h" |
| 22 | |
| 23 | #include "bashtypes.h" |
| 24 | #include <sys/param.h> |
| 25 | |
| 26 | #if defined (HAVE_UNISTD_H) |
| 27 | # include <unistd.h> |
| 28 | #endif |
| 29 | |
| 30 | #include "posixstat.h" |
| 31 | #include "filecntl.h" |
| 32 | #include "bashansi.h" |
| 33 | |
| 34 | #include <stdio.h> |
| 35 | #include <errno.h> |
| 36 | #include <ctype.h> |
| 37 | |
| 38 | #include "shell.h" |
| 39 | #include "maxpath.h" |
| 40 | |
| 41 | #if !defined (errno) |
| 42 | extern int errno; |
| 43 | #endif /* !errno */ |
| 44 | |
| 45 | /* A standard error message to use when getcwd() returns NULL. */ |
| 46 | char *bash_getcwd_errstr = "getcwd: cannot access parent directories"; |
| 47 | |
| 48 | #if !defined (HAVE_SYSCONF) || !defined (_SC_CLK_TCK) |
| 49 | # if !defined (CLK_TCK) |
| 50 | # if defined (HZ) |
| 51 | # define CLK_TCK HZ |
| 52 | # else |
| 53 | # define CLK_TCK 60 |
| 54 | # endif |
| 55 | # endif /* !CLK_TCK */ |
| 56 | #endif /* !HAVE_SYSCONF && !_SC_CLK_TCK */ |
| 57 | |
| 58 | long |
| 59 | get_clk_tck () |
| 60 | { |
| 61 | static long retval = 0; |
| 62 | |
| 63 | if (retval != 0) |
| 64 | return (retval); |
| 65 | |
| 66 | #if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK) |
| 67 | retval = sysconf (_SC_CLK_TCK); |
| 68 | #else /* !SYSCONF || !_SC_CLK_TCK */ |
| 69 | retval = CLK_TCK; |
| 70 | #endif /* !SYSCONF || !_SC_CLK_TCK */ |
| 71 | |
| 72 | return (retval); |
| 73 | } |
| 74 | |
| 75 | /* Make the functions strchr and strrchr if they do not exist. */ |
| 76 | #if !defined (HAVE_STRCHR) |
| 77 | char * |
| 78 | strchr (string, c) |
| 79 | char *string; |
| 80 | int c; |
| 81 | { |
| 82 | register char *s; |
| 83 | |
| 84 | for (s = string; s && *s; s++) |
| 85 | if (*s == c) |
| 86 | return (s); |
| 87 | |
| 88 | return ((char *) NULL); |
| 89 | } |
| 90 | |
| 91 | char * |
| 92 | strrchr (string, c) |
| 93 | char *string; |
| 94 | int c; |
| 95 | { |
| 96 | register char *s, *t; |
| 97 | |
| 98 | for (s = string, t = (char *)NULL; s && *s; s++) |
| 99 | if (*s == c) |
| 100 | t = s; |
| 101 | return (t); |
| 102 | } |
| 103 | #endif /* !HAVE_STRCHR */ |
| 104 | |
| 105 | #if !defined (HAVE_STRCASECMP) |
| 106 | |
| 107 | #if !defined (to_lower) |
Jari Aalto | d166f04 | 1997-06-05 14:59:13 +0000 | [diff] [blame^] | 108 | # define to_lower(c) (islower(c) ? (c) : tolower(c)) |
Jari Aalto | ccc6cda | 1996-12-23 17:02:34 +0000 | [diff] [blame] | 109 | #endif /* to_lower */ |
| 110 | |
| 111 | /* Compare at most COUNT characters from string1 to string2. Case |
| 112 | doesn't matter. */ |
| 113 | int |
| 114 | strncasecmp (string1, string2, count) |
| 115 | char *string1, *string2; |
| 116 | int count; |
| 117 | { |
| 118 | register char *s1, *s2; |
| 119 | register int r; |
| 120 | |
| 121 | if (count > 0) |
| 122 | { |
| 123 | s1 = string1; |
| 124 | s2 = string2; |
| 125 | do |
| 126 | { |
| 127 | if ((r = to_lower (*s1) - to_lower (*s2)) != 0) |
| 128 | return r; |
| 129 | if (*s1++ == '\0') |
| 130 | break; |
| 131 | s2++; |
| 132 | } |
| 133 | while (--count != 0); |
| 134 | } |
| 135 | return (0); |
| 136 | } |
| 137 | |
| 138 | /* strcmp (), but caseless. */ |
| 139 | int |
| 140 | strcasecmp (string1, string2) |
| 141 | char *string1, *string2; |
| 142 | { |
| 143 | register char *s1, *s2; |
| 144 | register int r; |
| 145 | |
| 146 | s1 = string1; |
| 147 | s2 = string2; |
| 148 | |
| 149 | while ((r = to_lower (*s1) - to_lower (*s2)) == 0) |
| 150 | { |
| 151 | if (*s1++ == '\0') |
| 152 | return 0; |
| 153 | s2++; |
| 154 | } |
| 155 | return (r); |
| 156 | } |
| 157 | #endif /* !HAVE_STRCASECMP */ |
| 158 | |
| 159 | /* Return a string corresponding to the error number E. From |
| 160 | the ANSI C spec. */ |
| 161 | #if defined (strerror) |
| 162 | # undef strerror |
| 163 | #endif |
| 164 | |
| 165 | #if !defined (HAVE_STRERROR) |
| 166 | char * |
| 167 | strerror (e) |
| 168 | int e; |
| 169 | { |
| 170 | static char emsg[40]; |
| 171 | #if defined (HAVE_SYS_ERRLIST) |
| 172 | extern int sys_nerr; |
| 173 | extern char *sys_errlist[]; |
| 174 | |
| 175 | if (e > 0 && e < sys_nerr) |
| 176 | return (sys_errlist[e]); |
| 177 | else |
| 178 | #endif /* HAVE_SYS_ERRLIST */ |
| 179 | { |
| 180 | sprintf (emsg, "Unknown error %d", e); |
| 181 | return (&emsg[0]); |
| 182 | } |
| 183 | } |
| 184 | #endif /* HAVE_STRERROR */ |
| 185 | |
| 186 | #if !defined (HAVE_DUP2) || defined (DUP2_BROKEN) |
| 187 | /* Replacement for dup2 (), for those systems which either don't have it, |
| 188 | or supply one with broken behaviour. */ |
| 189 | int |
| 190 | dup2 (fd1, fd2) |
| 191 | int fd1, fd2; |
| 192 | { |
| 193 | int saved_errno, r; |
| 194 | |
| 195 | /* If FD1 is not a valid file descriptor, then return immediately with |
| 196 | an error. */ |
| 197 | if (fcntl (fd1, F_GETFL, 0) == -1) |
| 198 | return (-1); |
| 199 | |
| 200 | if (fd2 < 0 || fd2 >= getdtablesize ()) |
| 201 | { |
| 202 | errno = EBADF; |
| 203 | return (-1); |
| 204 | } |
| 205 | |
| 206 | if (fd1 == fd2) |
| 207 | return (0); |
| 208 | |
| 209 | saved_errno = errno; |
| 210 | |
| 211 | (void) close (fd2); |
| 212 | r = fcntl (fd1, F_DUPFD, fd2); |
| 213 | |
| 214 | if (r >= 0) |
| 215 | errno = saved_errno; |
| 216 | else |
| 217 | if (errno == EINVAL) |
| 218 | errno = EBADF; |
| 219 | |
| 220 | /* Force the new file descriptor to remain open across exec () calls. */ |
| 221 | SET_OPEN_ON_EXEC (fd2); |
| 222 | return (r); |
| 223 | } |
| 224 | #endif /* !HAVE_DUP2 */ |
| 225 | |
| 226 | /* |
| 227 | * Return the total number of available file descriptors. |
| 228 | * |
| 229 | * On some systems, like 4.2BSD and its descendents, there is a system call |
| 230 | * that returns the size of the descriptor table: getdtablesize(). There are |
| 231 | * lots of ways to emulate this on non-BSD systems. |
| 232 | * |
| 233 | * On System V.3, this can be obtained via a call to ulimit: |
| 234 | * return (ulimit(4, 0L)); |
| 235 | * |
| 236 | * On other System V systems, NOFILE is defined in /usr/include/sys/param.h |
| 237 | * (this is what we assume below), so we can simply use it: |
| 238 | * return (NOFILE); |
| 239 | * |
| 240 | * On POSIX systems, there are specific functions for retrieving various |
| 241 | * configuration parameters: |
| 242 | * return (sysconf(_SC_OPEN_MAX)); |
| 243 | * |
| 244 | */ |
| 245 | |
| 246 | #if !defined (HAVE_GETDTABLESIZE) |
| 247 | int |
| 248 | getdtablesize () |
| 249 | { |
| 250 | # if defined (_POSIX_VERSION) && defined (HAVE_SYSCONF) && defined (_SC_OPEN_MAX) |
| 251 | return (sysconf(_SC_OPEN_MAX)); /* Posix systems use sysconf */ |
| 252 | # else /* ! (_POSIX_VERSION && HAVE_SYSCONF && _SC_OPEN_MAX) */ |
| 253 | # if defined (ULIMIT_MAXFDS) |
| 254 | return (ulimit (4, 0L)); /* System V.3 systems use ulimit(4, 0L) */ |
| 255 | # else /* !ULIMIT_MAXFDS */ |
| 256 | # if defined (NOFILE) /* Other systems use NOFILE */ |
| 257 | return (NOFILE); |
| 258 | # else /* !NOFILE */ |
| 259 | return (20); /* XXX - traditional value is 20 */ |
| 260 | # endif /* !NOFILE */ |
| 261 | # endif /* !ULIMIT_MAXFDS */ |
| 262 | # endif /* ! (_POSIX_VERSION && _SC_OPEN_MAX) */ |
| 263 | } |
| 264 | #endif /* !HAVE_GETDTABLESIZE */ |
| 265 | |
| 266 | #if !defined (HAVE_BCOPY) |
| 267 | void |
| 268 | bcopy (s,d,n) |
| 269 | char *d, *s; |
| 270 | int n; |
| 271 | { |
| 272 | FASTCOPY (s, d, n); |
| 273 | } |
| 274 | #endif /* !HAVE_BCOPY */ |
| 275 | |
| 276 | #if !defined (HAVE_BZERO) |
| 277 | void |
| 278 | bzero (s, n) |
| 279 | char *s; |
| 280 | int n; |
| 281 | { |
| 282 | register int i; |
Jari Aalto | d166f04 | 1997-06-05 14:59:13 +0000 | [diff] [blame^] | 283 | register char *r; |
Jari Aalto | ccc6cda | 1996-12-23 17:02:34 +0000 | [diff] [blame] | 284 | |
Jari Aalto | d166f04 | 1997-06-05 14:59:13 +0000 | [diff] [blame^] | 285 | for (i = 0, r = s; i < n; i++) |
| 286 | *r++ = '\0'; |
Jari Aalto | ccc6cda | 1996-12-23 17:02:34 +0000 | [diff] [blame] | 287 | } |
| 288 | #endif |
| 289 | |
| 290 | #if !defined (HAVE_GETHOSTNAME) |
| 291 | # if defined (HAVE_UNAME) |
| 292 | # include <sys/utsname.h> |
| 293 | int |
| 294 | gethostname (name, namelen) |
| 295 | char *name; |
| 296 | int namelen; |
| 297 | { |
| 298 | int i; |
| 299 | struct utsname ut; |
| 300 | |
| 301 | --namelen; |
| 302 | |
| 303 | uname (&ut); |
| 304 | i = strlen (ut.nodename) + 1; |
| 305 | strncpy (name, ut.nodename, i < namelen ? i : namelen); |
| 306 | name[namelen] = '\0'; |
| 307 | return (0); |
| 308 | } |
| 309 | # else /* !HAVE_UNAME */ |
| 310 | int |
| 311 | gethostname (name, namelen) |
| 312 | int name, namelen; |
| 313 | { |
| 314 | strncpy (name, "unknown", namelen); |
| 315 | name[namelen] = '\0'; |
| 316 | return 0; |
| 317 | } |
| 318 | # endif /* !HAVE_UNAME */ |
| 319 | #endif /* !HAVE_GETHOSTNAME */ |
| 320 | |
| 321 | #if !defined (HAVE_KILLPG) |
| 322 | int |
| 323 | killpg (pgrp, sig) |
| 324 | pid_t pgrp; |
| 325 | int sig; |
| 326 | { |
| 327 | return (kill (-pgrp, sig)); |
| 328 | } |
| 329 | #endif /* !HAVE_KILLPG */ |
| 330 | |
| 331 | |
| 332 | /* We supply our own version of getenv () because we want library |
| 333 | routines to get the changed values of exported variables. */ |
| 334 | |
| 335 | /* The NeXT C library has getenv () defined and used in the same file. |
| 336 | This screws our scheme. However, Bash will run on the NeXT using |
| 337 | the C library getenv (), since right now the only environment variable |
| 338 | that we care about is HOME, and that is already defined. */ |
| 339 | #if defined (CAN_REDEFINE_GETENV) |
| 340 | static char *last_tempenv_value = (char *)NULL; |
| 341 | extern char **environ; |
| 342 | |
| 343 | char * |
| 344 | getenv (name) |
| 345 | #if defined (__linux__) || defined (__bsdi__) || defined (convex) |
| 346 | const char *name; |
| 347 | #else |
| 348 | char const *name; |
| 349 | #endif /* !__linux__ && !__bsdi__ && !convex */ |
| 350 | { |
| 351 | SHELL_VAR *var; |
| 352 | |
| 353 | var = find_tempenv_variable ((char *)name); |
| 354 | if (var) |
| 355 | { |
| 356 | FREE (last_tempenv_value); |
| 357 | |
| 358 | last_tempenv_value = savestring (value_cell (var)); |
| 359 | dispose_variable (var); |
| 360 | return (last_tempenv_value); |
| 361 | } |
| 362 | else if (shell_variables) |
| 363 | { |
| 364 | var = find_variable ((char *)name); |
| 365 | if (var && exported_p (var)) |
| 366 | return (value_cell (var)); |
| 367 | } |
| 368 | else |
| 369 | { |
| 370 | register int i, len; |
| 371 | |
| 372 | /* In some cases, s5r3 invokes getenv() before main(); BSD systems |
| 373 | using gprof also exhibit this behavior. This means that |
| 374 | shell_variables will be 0 when this is invoked. We look up the |
| 375 | variable in the real environment in that case. */ |
| 376 | |
| 377 | for (i = 0, len = strlen (name); environ[i]; i++) |
| 378 | { |
| 379 | if ((STREQN (environ[i], name, len)) && (environ[i][len] == '=')) |
| 380 | return (environ[i] + len + 1); |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | return ((char *)NULL); |
| 385 | } |
| 386 | |
| 387 | /* Some versions of Unix use _getenv instead. */ |
| 388 | char * |
| 389 | _getenv (name) |
| 390 | #if defined (__linux__) || defined (__bsdi__) || defined (convex) |
| 391 | const char *name; |
| 392 | #else |
| 393 | char const *name; |
| 394 | #endif /* !__linux__ && !__bsdi__ && !convex */ |
| 395 | { |
| 396 | return (getenv (name)); |
| 397 | } |
| 398 | |
| 399 | #endif /* CAN_REDEFINE_GETENV */ |
| 400 | |
| 401 | #if !defined (HAVE_MKFIFO) && defined (PROCESS_SUBSTITUTION) |
| 402 | int |
| 403 | mkfifo (path, mode) |
| 404 | char *path; |
| 405 | int mode; |
| 406 | { |
| 407 | #if defined (S_IFIFO) |
| 408 | return (mknod (path, (mode | S_IFIFO), 0)); |
| 409 | #else /* !S_IFIFO */ |
| 410 | return (-1); |
| 411 | #endif /* !S_IFIFO */ |
| 412 | } |
| 413 | #endif |
| 414 | |
| 415 | #if !defined (HAVE_SETLINEBUF) |
| 416 | /* Cause STREAM to buffer lines as opposed to characters or blocks. */ |
| 417 | int |
| 418 | setlinebuf (stream) |
| 419 | FILE *stream; |
| 420 | { |
| 421 | #if defined (_IOLBF) |
| 422 | # if defined (SETVBUF_REVERSED) |
| 423 | setvbuf (stream, _IOLBF, (char *)NULL, BUFSIZ); |
| 424 | # else /* !SETVBUF_REVERSED */ |
| 425 | setvbuf (stream, (char *)NULL, _IOLBF, BUFSIZ); |
| 426 | # endif /* !SETVBUF_REVERSED */ |
| 427 | #endif /* _IOLBF */ |
| 428 | return (0); |
| 429 | } |
| 430 | #endif /* !HAVE_SETLINEBUF */ |