667 lines
12 KiB
C
667 lines
12 KiB
C
/* $Header: /p/tcsh/cvsroot/tcsh/sh.misc.c,v 3.45 2006/10/14 17:57:21 christos Exp $ */
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/*
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* sh.misc.c: Miscelaneous functions
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*/
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/*-
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* Copyright (c) 1980, 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "sh.h"
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RCSID("$tcsh: sh.misc.c,v 3.45 2006/10/14 17:57:21 christos Exp $")
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static int renum (int, int);
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static Char **blkend (Char **);
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static Char **blkcat (Char **, Char **);
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static int xdup2 (int, int);
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/*
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* C Shell
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*/
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int
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any(const char *s, Char c)
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{
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if (!s)
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return (0); /* Check for nil pointer */
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while (*s)
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if ((Char)*s++ == c)
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return (1);
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return (0);
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}
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void
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setzero(void *p, size_t size)
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{
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memset(p, 0, size);
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}
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char *
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strnsave(const char *s, size_t len)
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{
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char *r;
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r = xmalloc(len + 1);
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memcpy(r, s, len);
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r[len] = '\0';
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return r;
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}
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char *
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strsave(const char *s)
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{
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char *r;
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size_t size;
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if (s == NULL)
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s = "";
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size = strlen(s) + 1;
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r = xmalloc(size);
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memcpy(r, s, size);
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return (r);
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}
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static Char **
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blkend(Char **up)
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{
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while (*up)
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up++;
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return (up);
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}
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void
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blkpr(Char *const *av)
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{
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for (; *av; av++) {
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xprintf("%S", *av);
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if (av[1])
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xprintf(" ");
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}
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}
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Char *
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blkexpand(Char *const *av)
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{
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struct Strbuf buf = Strbuf_INIT;
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for (; *av; av++) {
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Strbuf_append(&buf, *av);
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if (av[1])
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Strbuf_append1(&buf, ' ');
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}
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return Strbuf_finish(&buf);
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}
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int
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blklen(Char **av)
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{
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int i = 0;
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while (*av++)
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i++;
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return (i);
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}
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Char **
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blkcpy(Char **oav, Char **bv)
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{
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Char **av = oav;
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while ((*av++ = *bv++) != NULL)
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continue;
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return (oav);
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}
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static Char **
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blkcat(Char **up, Char **vp)
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{
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(void) blkcpy(blkend(up), vp);
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return (up);
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}
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void
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blkfree(Char **av0)
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{
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Char **av = av0;
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if (!av0)
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return;
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for (; *av; av++)
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xfree(*av);
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xfree(av0);
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}
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void
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blk_cleanup(void *ptr)
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{
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blkfree(ptr);
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}
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void
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blk_indirect_cleanup(void *xptr)
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{
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Char ***ptr;
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ptr = xptr;
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blkfree(*ptr);
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xfree(ptr);
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}
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Char **
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saveblk(Char **v)
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{
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Char **newv, **onewv;
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if (v == NULL)
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return NULL;
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onewv = newv = xcalloc(blklen(v) + 1, sizeof(Char **));
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while (*v)
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*newv++ = Strsave(*v++);
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return (onewv);
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}
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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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do {
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const char *ss = s;
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const char *tt = t;
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do
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if (*tt == '\0')
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return (s);
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while (*ss++ == *tt++);
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} while (*s++ != '\0');
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return (NULL);
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}
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#endif /* !HAVE_STRSTR */
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char *
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strspl(const char *cp, const char *dp)
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{
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char *ep;
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size_t cl, dl;
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if (!cp)
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cp = "";
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if (!dp)
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dp = "";
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cl = strlen(cp);
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dl = strlen(dp);
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ep = xmalloc((cl + dl + 1) * sizeof(char));
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memcpy(ep, cp, cl);
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memcpy(ep + cl, dp, dl + 1);
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return (ep);
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}
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Char **
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blkspl(Char **up, Char **vp)
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{
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Char **wp = xcalloc(blklen(up) + blklen(vp) + 1, sizeof(Char **));
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(void) blkcpy(wp, up);
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return (blkcat(wp, vp));
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}
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Char
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lastchr(Char *cp)
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{
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if (!cp)
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return (0);
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if (!*cp)
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return (0);
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while (cp[1])
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cp++;
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return (*cp);
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}
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/*
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* This routine is called after an error to close up
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* any units which may have been left open accidentally.
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*/
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void
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closem(void)
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{
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int f, num_files;
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#ifdef NLS_BUGS
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#ifdef NLS_CATALOGS
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nlsclose();
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#endif /* NLS_CATALOGS */
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#endif /* NLS_BUGS */
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#ifdef YPBUGS
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/* suggested by Justin Bur; thanks to Karl Kleinpaste */
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fix_yp_bugs();
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#endif /* YPBUGS */
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num_files = NOFILE;
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for (f = 0; f < num_files; f++)
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if (f != SHIN && f != SHOUT && f != SHDIAG && f != OLDSTD &&
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f != FSHTTY
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#ifdef MALLOC_TRACE
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&& f != 25
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#endif /* MALLOC_TRACE */
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)
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{
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xclose(f);
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#ifdef NISPLUS
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if(f < 3)
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(void) xopen(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE);
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#endif /* NISPLUS */
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}
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#ifdef NLS_BUGS
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#ifdef NLS_CATALOGS
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nlsinit();
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#endif /* NLS_CATALOGS */
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#endif /* NLS_BUGS */
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}
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#ifndef CLOSE_ON_EXEC
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/*
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* Close files before executing a file.
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* We could be MUCH more intelligent, since (on a version 7 system)
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* we need only close files here during a source, the other
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* shell fd's being in units 16-19 which are closed automatically!
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*/
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void
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closech(void)
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{
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int f, num_files;
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if (didcch)
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return;
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didcch = 1;
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SHIN = 0;
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SHOUT = 1;
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SHDIAG = 2;
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OLDSTD = 0;
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isoutatty = isatty(SHOUT);
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isdiagatty = isatty(SHDIAG);
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num_files = NOFILE;
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for (f = 3; f < num_files; f++)
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xclose(f);
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}
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#endif /* CLOSE_ON_EXEC */
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void
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donefds(void)
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{
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xclose(0);
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xclose(1);
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xclose(2);
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didfds = 0;
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#ifdef NISPLUS
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{
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int fd = xopen(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE);
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(void)dcopy(fd, 1);
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(void)dcopy(fd, 2);
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(void)dmove(fd, 0);
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}
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#endif /*NISPLUS*/
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}
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/*
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* Move descriptor i to j.
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* If j is -1 then we just want to get i to a safe place,
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* i.e. to a unit > FSAFE. This also happens in dcopy.
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*/
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int
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dmove(int i, int j)
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{
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if (i == j || i < 0)
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return (i);
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#ifdef HAVE_DUP2
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if (j >= 0) {
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(void) xdup2(i, j);
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if (j != i)
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xclose(i);
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return (j);
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}
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#endif
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j = dcopy(i, j);
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if (j != i)
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xclose(i);
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return (j);
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}
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int
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dcopy(int i, int j)
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{
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if (i == j || i < 0 || (j < 0 && i > FSAFE))
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return (i);
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if (j >= 0) {
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#ifdef HAVE_DUP2
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(void) xdup2(i, j);
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return (j);
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#else
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xclose(j);
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#endif
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}
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return (renum(i, j));
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}
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static int
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renum(int i, int j)
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{
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int k = dup(i);
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if (k < 0)
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return (-1);
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if (j == -1 && k > FSAFE)
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return (k);
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if (k != j) {
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j = renum(k, j);
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xclose(k);
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return (j);
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}
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return (k);
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}
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/*
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* Left shift a command argument list, discarding
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* the first c arguments. Used in "shift" commands
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* as well as by commands like "repeat".
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*/
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void
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lshift(Char **v, int c)
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{
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Char **u;
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for (u = v; *u && --c >= 0; u++)
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xfree(*u);
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(void) blkcpy(v, u);
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}
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int
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number(Char *cp)
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{
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if (!cp)
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return (0);
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if (*cp == '-') {
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cp++;
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if (!Isdigit(*cp))
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return (0);
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cp++;
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}
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while (*cp && Isdigit(*cp))
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cp++;
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return (*cp == 0);
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}
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Char **
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copyblk(Char **v)
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{
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Char **nv = xcalloc(blklen(v) + 1, sizeof(Char **));
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return (blkcpy(nv, v));
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}
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char *
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strend(const char *cp)
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{
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if (!cp)
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return ((char *)(intptr_t)cp);
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while (*cp)
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cp++;
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return ((char *)(intptr_t)cp);
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}
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Char *
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strip(Char *cp)
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{
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Char *dp = cp;
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if (!cp)
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return (cp);
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while ((*dp++ &= TRIM) != '\0')
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continue;
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return (cp);
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}
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Char *
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quote(Char *cp)
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{
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Char *dp = cp;
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if (!cp)
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return (cp);
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while (*dp != '\0')
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*dp++ |= QUOTE;
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return (cp);
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}
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const Char *
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quote_meta(struct Strbuf *buf, const Char *s)
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{
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buf->len = 0;
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while (*s != '\0') {
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if (cmap(*s, _META | _DOL | _QF | _QB | _ESC | _GLOB))
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Strbuf_append1(buf, '\\');
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Strbuf_append1(buf, *s++);
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}
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Strbuf_terminate(buf);
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return buf->s;
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}
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void
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udvar(Char *name)
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{
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setname(short2str(name));
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stderror(ERR_NAME | ERR_UNDVAR);
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}
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int
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prefix(const Char *sub, const Char *str)
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{
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for (;;) {
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if (*sub == 0)
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return (1);
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if (*str == 0)
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return (0);
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if ((*sub++ & TRIM) != (*str++ & TRIM))
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return (0);
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}
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}
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#ifndef WINNT_NATIVE
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char *
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areadlink(const char *path)
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{
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char *buf;
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size_t size;
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ssize_t res;
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size = MAXPATHLEN + 1;
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buf = xmalloc(size);
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while ((size_t)(res = readlink(path, buf, size)) == size) {
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size *= 2;
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buf = xrealloc(buf, size);
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}
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if (res == -1) {
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int err;
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err = errno;
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xfree(buf);
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errno = err;
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return NULL;
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}
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buf[res] = '\0';
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return xrealloc(buf, res + 1);
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}
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#endif /*!WINNT_NATIVE*/
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void
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xclose(int fildes)
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{
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if (fildes < 0)
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return;
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while (close(fildes) == -1 && errno == EINTR)
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handle_pending_signals();
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}
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void
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xclosedir(DIR *dirp)
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{
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while (closedir(dirp) == -1 && errno == EINTR)
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handle_pending_signals();
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}
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int
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xcreat(const char *path, mode_t mode)
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{
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int res;
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while ((res = creat(path, mode)) == -1 && errno == EINTR)
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handle_pending_signals();
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return res;
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}
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#ifdef HAVE_DUP2
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static int
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xdup2(int fildes, int fildes2)
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{
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int res;
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while ((res = dup2(fildes, fildes2)) == -1 && errno == EINTR)
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handle_pending_signals();
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return res;
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}
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#endif
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struct group *
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xgetgrgid(gid_t xgid)
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{
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struct group *res;
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errno = 0;
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while ((res = getgrgid(xgid)) == NULL && errno == EINTR) {
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handle_pending_signals();
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errno = 0;
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}
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return res;
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}
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struct passwd *
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xgetpwnam(const char *name)
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{
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struct passwd *res;
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errno = 0;
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while ((res = getpwnam(name)) == NULL && errno == EINTR) {
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handle_pending_signals();
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errno = 0;
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}
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return res;
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}
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struct passwd *
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xgetpwuid(uid_t xuid)
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{
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struct passwd *res;
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errno = 0;
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while ((res = getpwuid(xuid)) == NULL && errno == EINTR) {
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handle_pending_signals();
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errno = 0;
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}
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return res;
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}
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int
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xopen(const char *path, int oflag, ...)
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{
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int res;
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if ((oflag & O_CREAT) == 0) {
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|
while ((res = open(path, oflag)) == -1 && errno == EINTR)
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handle_pending_signals();
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} else {
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|
va_list ap;
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|
mode_t mode;
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va_start(ap, oflag);
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|
/* "int" should actually be "mode_t after default argument
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|
promotions". "int" is the best guess we have, "mode_t" used to be
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"unsigned short", which we obviously can't use. */
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|
mode = va_arg(ap, int);
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va_end(ap);
|
|
while ((res = open(path, oflag, mode)) == -1 && errno == EINTR)
|
|
handle_pending_signals();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
ssize_t
|
|
xread(int fildes, void *buf, size_t nbyte)
|
|
{
|
|
ssize_t res;
|
|
|
|
/* This is where we will be blocked most of the time, so handle signals
|
|
that didn't interrupt any system call. */
|
|
do
|
|
handle_pending_signals();
|
|
while ((res = read(fildes, buf, nbyte)) == -1 && errno == EINTR);
|
|
return res;
|
|
}
|
|
|
|
#ifdef POSIX
|
|
int
|
|
xtcsetattr(int fildes, int optional_actions, const struct termios *termios_p)
|
|
{
|
|
int res;
|
|
|
|
while ((res = tcsetattr(fildes, optional_actions, termios_p)) == -1 &&
|
|
errno == EINTR)
|
|
handle_pending_signals();
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
ssize_t
|
|
xwrite(int fildes, const void *buf, size_t nbyte)
|
|
{
|
|
ssize_t res;
|
|
|
|
/* This is where we will be blocked most of the time, so handle signals
|
|
that didn't interrupt any system call. */
|
|
do
|
|
handle_pending_signals();
|
|
while ((res = write(fildes, buf, nbyte)) == -1 && errno == EINTR);
|
|
return res;
|
|
}
|