mirror of
git://git.code.sf.net/p/zsh/code
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426 lines
10 KiB
C
426 lines
10 KiB
C
/*
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* compat.c - compatibiltiy routines for the deprived
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*
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* This file is part of zsh, the Z shell.
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*
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* Copyright (c) 1992-1997 Paul Falstad
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* All rights reserved.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and to distribute modified versions of this software for any
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* purpose, provided that the above copyright notice and the following
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* two paragraphs appear in all copies of this software.
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*
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* In no event shall Paul Falstad or the Zsh Development Group be liable
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* to any party for direct, indirect, special, incidental, or consequential
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* damages arising out of the use of this software and its documentation,
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* even if Paul Falstad and the Zsh Development Group have been advised of
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* the possibility of such damage.
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*
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* Paul Falstad and the Zsh Development Group specifically disclaim any
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* warranties, including, but not limited to, the implied warranties of
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* merchantability and fitness for a particular purpose. The software
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* provided hereunder is on an "as is" basis, and Paul Falstad and the
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* Zsh Development Group have no obligation to provide maintenance,
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* support, updates, enhancements, or modifications.
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*
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*/
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#include "zsh.mdh"
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#include "compat.pro"
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/* Return pointer to first occurence of string t *
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* in string s. Return NULL if not present. */
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#ifndef HAVE_STRSTR
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char *
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strstr(const char *s, const char *t)
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{
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char *p1, *p2;
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for (; *s; s++) {
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for (p1 = s, p2 = t; *p2; p1++, p2++)
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if (*p1 != *p2)
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break;
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if (!*p2)
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return (char *)s;
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}
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return NULL;
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}
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#endif
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#ifndef HAVE_GETHOSTNAME
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int
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gethostname(char *name, size_t namelen)
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{
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struct utsname uts;
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uname(&uts);
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if(strlen(uts.nodename) >= namelen) {
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errno = EINVAL;
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return -1;
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}
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strcpy(name, uts.nodename);
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return 0;
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}
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#endif
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#ifndef HAVE_GETTIMEOFDAY
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int
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gettimeofday(struct timeval *tv, struct timezone *tz)
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{
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tv->tv_usec = 0;
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tv->tv_sec = (long)time((time_t) 0);
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return 0;
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}
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#endif
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/* compute the difference between two calendar times */
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#ifndef HAVE_DIFFTIME
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double
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difftime(time_t t2, time_t t1)
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{
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return ((double)t2 - (double)t1);
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}
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#endif
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#ifndef HAVE_STRERROR
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extern char *sys_errlist[];
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/* Get error message string associated with a particular *
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* error number, and returns a pointer to that string. *
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* This is not a particularly robust version of strerror. */
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char *
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strerror(int errnum)
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{
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return (sys_errlist[errnum]);
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}
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#endif
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#if 0
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/* pathconf(_PC_PATH_MAX) is not currently useful to zsh. The value *
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* returned varies depending on a number of factors, e.g. the amount *
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* of memory available to the operating system at a given time; thus *
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* it can't be used for buffer allocation, or even as an indication *
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* of whether an attempt to use or create a given pathname may fail *
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* at any future time. *
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* *
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* The call is also permitted to fail if the argument path is not an *
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* existing directory, so even to make sense of that one must search *
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* for a valid directory somewhere in the path and adjust. Even if *
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* it succeeds, the return value is relative to the input directory, *
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* and therefore potentially relative to the length of the shortest *
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* path either to that directory or to our working directory. *
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* *
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* Finally, see the note below for glibc; detection of pathconf() is *
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* not by itself an indication that it works reliably. */
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/* The documentation for pathconf() says something like: *
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* The limit is returned, if one exists. If the system does *
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* not have a limit for the requested resource, -1 is *
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* returned, and errno is unchanged. If there is an error, *
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* -1 is returned, and errno is set to reflect the nature of *
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* the error. *
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* *
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* System calls are not permitted to set errno to 0; but we must (or *
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* some other flag value) in order to determine that the resource is *
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* unlimited. What use is leaving errno unchanged? Instead, define *
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* a wrapper that resets errno to 0 and returns 0 for "the system *
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* does not have a limit," so that -1 always means a real error. */
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/**/
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mod_export long
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zpathmax(char *dir)
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{
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#ifdef HAVE_PATHCONF
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long pathmax;
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errno = 0;
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if ((pathmax = pathconf(dir, _PC_PATH_MAX)) >= 0) {
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/* Some versions of glibc pathconf return a hardwired value! */
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return pathmax;
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} else if (errno == EINVAL || errno == ENOENT || errno == ENOTDIR) {
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/* Work backward to find a directory, until we run out of path. */
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char *tail = strrchr(dir, '/');
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while (tail > dir && tail[-1] == '/')
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--tail;
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if (tail > dir) {
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*tail = 0;
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pathmax = zpathmax(dir);
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*tail = '/';
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} else {
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errno = 0;
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if (tail)
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pathmax = pathconf("/", _PC_PATH_MAX);
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else
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pathmax = pathconf(".", _PC_PATH_MAX);
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}
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if (pathmax > 0) {
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long taillen = (tail ? strlen(tail) : (strlen(dir) + 1));
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if (taillen < pathmax)
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return pathmax - taillen;
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else
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errno = ENAMETOOLONG;
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}
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}
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if (errno)
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return -1;
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else
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return 0; /* pathmax should be considered unlimited */
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#else
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long dirlen = strlen(dir);
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/* The following is wrong if dir is not an absolute path. */
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return ((long) ((dirlen >= PATH_MAX) ?
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((errno = ENAMETOOLONG), -1) :
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((errno = 0), PATH_MAX - dirlen)));
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#endif
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}
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#endif // 0
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#ifdef HAVE_SYSCONF
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/* This is replaced by a macro from system.h if not HAVE_SYSCONF. *
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* 0 is returned by sysconf if _SC_OPEN_MAX is unavailable; *
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* -1 is returned on error *
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* *
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* Neither of these should happen, but resort to OPEN_MAX rather *
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* than return 0 or -1 just in case. */
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/**/
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mod_export long
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zopenmax(void)
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{
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long openmax = sysconf(_SC_OPEN_MAX);
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if (openmax < 1)
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return OPEN_MAX;
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else
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return openmax;
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}
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#endif
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/**/
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mod_export char *
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zgetdir(struct dirsav *d)
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{
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char nbuf[PATH_MAX+3];
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char *buf;
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int bufsiz, pos;
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struct stat sbuf;
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ino_t pino;
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dev_t pdev;
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#if !defined(__CYGWIN__) && !defined(USE_GETCWD)
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struct dirent *de;
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DIR *dir;
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dev_t dev;
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ino_t ino;
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int len;
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#endif
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buf = zhalloc(bufsiz = PATH_MAX);
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pos = bufsiz - 1;
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buf[pos] = '\0';
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strcpy(nbuf, "../");
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if (stat(".", &sbuf) < 0) {
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if (d)
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return NULL;
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buf[0] = '.';
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buf[1] = '\0';
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return buf;
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}
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pino = sbuf.st_ino;
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pdev = sbuf.st_dev;
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if (d)
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d->ino = pino, d->dev = pdev;
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#ifdef HAVE_FCHDIR
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else
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#endif
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#if !defined(__CYGWIN__) && !defined(USE_GETCWD)
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holdintr();
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for (;;) {
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if (stat("..", &sbuf) < 0)
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break;
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ino = pino;
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dev = pdev;
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pino = sbuf.st_ino;
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pdev = sbuf.st_dev;
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if (ino == pino && dev == pdev) {
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if (!buf[pos])
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buf[--pos] = '/';
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if (d) {
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#ifndef HAVE_FCHDIR
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zchdir(buf + pos);
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noholdintr();
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#endif
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return d->dirname = ztrdup(buf + pos);
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}
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zchdir(buf + pos);
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noholdintr();
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return buf + pos;
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}
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if (!(dir = opendir("..")))
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break;
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while ((de = readdir(dir))) {
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char *fn = de->d_name;
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/* Ignore `.' and `..'. */
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if (fn[0] == '.' &&
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(fn[1] == '\0' ||
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(fn[1] == '.' && fn[2] == '\0')))
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continue;
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#ifdef HAVE_STRUCT_DIRENT_D_STAT
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if(de->d_stat.st_dev == dev && de->d_stat.st_ino == ino) {
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strncpy(nbuf + 3, fn, PATH_MAX);
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break;
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}
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#else /* !HAVE_STRUCT_DIRENT_D_STAT */
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# ifdef HAVE_STRUCT_DIRENT_D_INO
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if (dev != pdev || (ino_t) de->d_ino == ino)
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# endif /* HAVE_STRUCT_DIRENT_D_INO */
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{
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strncpy(nbuf + 3, fn, PATH_MAX);
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lstat(nbuf, &sbuf);
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if (sbuf.st_dev == dev && sbuf.st_ino == ino)
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break;
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}
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#endif /* !HAVE_STRUCT_DIRENT_D_STAT */
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}
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closedir(dir);
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if (!de)
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break;
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len = strlen(nbuf + 2);
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pos -= len;
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while (pos <= 1) {
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char *newbuf = zhalloc(2*bufsiz);
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memcpy(newbuf + bufsiz, buf, bufsiz);
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buf = newbuf;
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pos += bufsiz;
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bufsiz *= 2;
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}
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memcpy(buf + pos, nbuf + 2, len);
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#ifdef HAVE_FCHDIR
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if (d)
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return d->dirname = ztrdup(buf + pos + 1);
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#endif
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if (chdir(".."))
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break;
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}
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if (d) {
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#ifndef HAVE_FCHDIR
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if (*buf)
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zchdir(buf + pos + 1);
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noholdintr();
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#endif
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return NULL;
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}
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if (*buf)
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zchdir(buf + pos + 1);
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noholdintr();
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#else /* __CYGWIN__, USE_GETCWD cases */
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if (!getcwd(buf, bufsiz)) {
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if (d) {
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return NULL;
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}
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} else {
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if (d) {
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return d->dirname = ztrdup(buf);
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}
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return buf;
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}
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#endif
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buf[0] = '.';
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buf[1] = '\0';
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return buf;
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}
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/**/
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char *
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zgetcwd(void)
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{
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return zgetdir(NULL);
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}
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/* chdir with arbitrary long pathname. Returns 0 on success, 0 on normal *
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* faliliure and -2 when chdir failed and the current directory is lost. */
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/**/
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mod_export int
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zchdir(char *dir)
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{
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char *s;
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int currdir = -2;
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for (;;) {
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if (!*dir)
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return 0;
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if (!chdir(dir))
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return 0;
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if ((errno != ENAMETOOLONG && errno != ENOMEM) ||
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strlen(dir) < PATH_MAX)
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break;
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for (s = dir + PATH_MAX - 1; s > dir && *s != '/'; s--);
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if (s == dir)
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break;
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#ifdef HAVE_FCHDIR
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if (currdir == -2)
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currdir = open(".", O_RDONLY|O_NOCTTY);
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#endif
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*s = '\0';
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if (chdir(dir)) {
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*s = '/';
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break;
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}
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#ifndef HAVE_FCHDIR
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currdir = -1;
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#endif
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*s = '/';
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while (*++s == '/');
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dir = s;
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}
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#ifdef HAVE_FCHDIR
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if (currdir == -1 || (currdir >= 0 && fchdir(currdir))) {
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if (currdir >= 0)
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close(currdir);
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return -2;
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}
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if (currdir >= 0)
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close(currdir);
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return -1;
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#else
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return currdir == -2 ? -1 : -2;
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#endif
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}
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/*
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* How to print out a 64 bit integer. This isn't needed (1) if longs
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* are 64 bit, since ordinary %ld will work (2) if we couldn't find a
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* 64 bit type anyway.
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*/
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/**/
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#ifdef ZSH_64_BIT_TYPE
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/**/
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mod_export char *
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output64(zlong val)
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{
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static char llbuf[DIGBUFSIZE];
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convbase(llbuf, val, 0);
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return llbuf;
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}
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/**/
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#endif /* ZSH_64_BIT_TYPE */
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