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-rw-r--r--misc.c722
1 files changed, 722 insertions, 0 deletions
diff --git a/misc.c b/misc.c
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+++ b/misc.c
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+/* Copyright (c) 2008, 2009
+ * Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
+ * Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
+ * Micah Cowan (micah@cowan.name)
+ * Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
+ * Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
+ * Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
+ * Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
+ * Copyright (c) 1987 Oliver Laumann
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING); if not, see
+ * https://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
+ *
+ ****************************************************************
+ */
+
+#include <poll.h>
+#include <sys/types.h>
+#include <sys/stat.h> /* mkdir() declaration */
+#include <signal.h>
+
+#include "config.h"
+#include "screen.h"
+#include "extern.h"
+
+#ifdef SVR4
+# include <sys/resource.h>
+#endif
+
+extern struct layer *flayer;
+
+extern int eff_uid, real_uid;
+extern int eff_gid, real_gid;
+extern struct mline mline_old;
+extern struct mchar mchar_blank;
+extern unsigned char *null, *blank;
+
+#ifdef HAVE_FDWALK
+static int close_func __P((void *, int));
+#endif
+
+char *
+SaveStr(register const char *str)
+{
+ register char *cp;
+
+ if (str == NULL)
+ Panic(0, "SaveStr() received NULL - possibly failed crypt()");
+ if ((cp = malloc(strlen(str) + 1)) == NULL)
+ Panic(0, "%s", strnomem);
+ else
+ strcpy(cp, str);
+ return cp;
+}
+
+char *
+SaveStrn(register const char *str, int n)
+{
+ register char *cp;
+
+ if ((cp = malloc(n + 1)) == NULL)
+ Panic(0, "%s", strnomem);
+ else {
+ bcopy((char *)str, cp, n);
+ cp[n] = 0;
+ }
+ return cp;
+}
+
+/* cheap strstr replacement */
+char *
+InStr(char *str, const char *pat)
+{
+ int npat = strlen(pat);
+ for (; *str; str++)
+ if (!strncmp(str, pat, npat))
+ return str;
+ return 0;
+}
+
+#ifndef HAVE_STRERROR
+char *
+strerror(int err)
+{
+ extern int sys_nerr;
+ extern char *sys_errlist[];
+
+ static char er[20];
+ if (err > 0 && err < sys_nerr)
+ return sys_errlist[err];
+ sprintf(er, "Error %d", err);
+ return er;
+}
+#endif
+
+void
+centerline(char *str, int y)
+{
+ int l, n;
+
+ ASSERT(flayer);
+ n = strlen(str);
+ if (n > flayer->l_width - 1)
+ n = flayer->l_width - 1;
+ l = (flayer->l_width - 1 - n) / 2;
+ LPutStr(flayer, str, n, &mchar_blank, l, y);
+}
+
+void
+leftline(char *str, int y, struct mchar *rend)
+{
+ int l, n;
+ struct mchar mchar_dol;
+
+ mchar_dol = mchar_blank;
+ mchar_dol.image = '$';
+
+ ASSERT(flayer);
+ l = n = strlen(str);
+ if (n > flayer->l_width - 1)
+ n = flayer->l_width - 1;
+ LPutStr(flayer, str, n, rend ? rend : &mchar_blank, 0, y);
+ if (n != l)
+ LPutChar(flayer, &mchar_dol, n, y);
+}
+
+char *
+Filename(char *s)
+{
+ register char *p = s;
+
+ if (p)
+ while (*p)
+ if (*p++ == '/')
+ s = p;
+ return s;
+}
+
+char *
+stripdev(char *nam)
+{
+#ifdef apollo
+ char *p;
+
+ if (nam == NULL)
+ return NULL;
+# ifdef SVR4
+ /* unixware has /dev/pts012 as synonym for /dev/pts/12 */
+ if (!strncmp(nam, "/dev/pts", 8) && nam[8] >= '0' && nam[8] <= '9') {
+ static char b[13];
+ sprintf(b, "pts/%d", atoi(nam + 8));
+ return b;
+ }
+# endif /* SVR4 */
+ if (p = strstr(nam, "/dev/"))
+ return p + 5;
+#else /* apollo */
+ if (nam == NULL)
+ return NULL;
+ if (strncmp(nam, "/dev/", 5) == 0)
+ return nam + 5;
+#endif /* apollo */
+ return nam;
+}
+
+/*
+ * Signal handling
+ */
+
+#ifdef POSIX
+sigret_t (*xsignal(sig, func))
+# ifndef __APPLE__
+ __P(SIGPROTOARG)
+# else
+()
+# endif
+int sig;
+sigret_t (*func) __P(SIGPROTOARG);
+{
+ struct sigaction osa, sa;
+ sa.sa_handler = func;
+ (void)sigemptyset(&sa.sa_mask);
+#ifdef SA_RESTART
+ sa.sa_flags = (sig == SIGCHLD ? SA_RESTART : 0);
+#else
+ sa.sa_flags = 0;
+#endif
+ if (sigaction(sig, &sa, &osa))
+ return (sigret_t (*)__P(SIGPROTOARG))-1;
+ return osa.sa_handler;
+}
+
+#else
+# ifdef hpux
+/*
+ * hpux has berkeley signal semantics if we use sigvector,
+ * but not, if we use signal, so we define our own signal() routine.
+ */
+void (*xsignal(sig, func)) __P(SIGPROTOARG)
+int sig;
+void (*func) __P(SIGPROTOARG);
+{
+ struct sigvec osv, sv;
+
+ sv.sv_handler = func;
+ sv.sv_mask = sigmask(sig);
+ sv.sv_flags = SV_BSDSIG;
+ if (sigvector(sig, &sv, &osv) < 0)
+ return (void (*)__P(SIGPROTOARG))(BADSIG);
+ return osv.sv_handler;
+}
+# endif /* hpux */
+#endif /* POSIX */
+
+/*
+ * uid/gid handling
+ */
+
+#ifdef HAVE_SETEUID
+
+void
+xseteuid(int euid)
+{
+ if (seteuid(euid) == 0)
+ return;
+ seteuid(0);
+ if (seteuid(euid))
+ Panic(errno, "seteuid");
+}
+
+void
+xsetegid(int egid)
+{
+ if (setegid(egid))
+ Panic(errno, "setegid");
+}
+
+#else /* HAVE_SETEUID */
+# ifdef HAVE_SETREUID
+
+void
+xseteuid(int euid)
+{
+ int oeuid;
+
+ oeuid = geteuid();
+ if (oeuid == euid)
+ return;
+ if ((int)getuid() != euid)
+ oeuid = getuid();
+ if (setreuid(oeuid, euid))
+ Panic(errno, "setreuid");
+}
+
+void
+xsetegid(int egid)
+{
+ int oegid;
+
+ oegid = getegid();
+ if (oegid == egid)
+ return;
+ if ((int)getgid() != egid)
+ oegid = getgid();
+ if (setregid(oegid, egid))
+ Panic(errno, "setregid");
+}
+
+# endif /* HAVE_SETREUID */
+#endif /* HAVE_SETEUID */
+
+#ifdef NEED_OWN_BCOPY
+void
+xbcopy(register char *s1, register char *s2, register int len)
+{
+ if (s1 < s2 && s2 < s1 + len) {
+ s1 += len;
+ s2 += len;
+ while (len-- > 0)
+ *--s2 = *--s1;
+ } else
+ while (len-- > 0)
+ *s2++ = *s1++;
+}
+#endif /* NEED_OWN_BCOPY */
+
+void
+bclear(char *p, int n)
+{
+ bcopy((char *)blank, p, n);
+}
+
+void
+Kill(int pid, int sig)
+{
+ if (pid < 2)
+ return;
+ (void)kill(pid, sig);
+}
+
+#ifdef HAVE_FDWALK
+/*
+ * Modern versions of Solaris include fdwalk(3c) which allows efficient
+ * implementation of closing open descriptors; this is helpful because
+ * the default file descriptor limit has risen to 65k.
+ */
+static int
+close_func(void *cb_data, int fd)
+{
+ int except = *(int *)cb_data;
+ if (fd > 2 && fd != except)
+ (void)close(fd);
+ return (0);
+}
+
+void
+closeallfiles(int except)
+{
+ (void)fdwalk(close_func, &except);
+}
+
+#else /* HAVE_FDWALK */
+
+void
+closeallfiles(int except)
+{
+ int f;
+#ifdef SVR4
+ struct rlimit rl;
+
+ if ((getrlimit(RLIMIT_NOFILE, &rl) == 0) &&
+ rl.rlim_max != RLIM_INFINITY)
+ f = rl.rlim_max;
+ else
+#endif /* SVR4 */
+#if defined(SYSV) && defined(NOFILE) && !defined(ISC)
+ f = NOFILE;
+ while (--f > 2)
+ if (f != except)
+ close(f);
+#else /* SYSV && !ISC */
+ {
+ struct pollfd pfd[1024];
+ int maxfd, i, ret, z;
+
+ i = 3; /* skip stdin, stdout and stderr */
+ maxfd = getdtablesize();
+
+ while (i < maxfd) {
+ memset(pfd, 0, sizeof(pfd));
+
+ z = 0;
+ for (f = i; f < maxfd && f < i + 1024; f++)
+ pfd[z++].fd = f;
+
+ ret = poll(pfd, f - i, 0);
+ if (ret < 0)
+ Panic(errno, "poll");
+
+ z = 0;
+ for (f = i; f < maxfd && f < i + 1024; f++)
+ if (!(pfd[z++].revents & POLLNVAL) &&
+ f != except)
+ close(f);
+
+ i = f;
+ }
+ }
+#endif /* SYSV && !ISC */
+}
+
+#endif /* HAVE_FDWALK */
+
+/*
+ * Security - switch to real uid
+ */
+
+#ifndef USE_SETEUID
+static int UserPID;
+static sigret_t (*Usersigcld) __P(SIGPROTOARG);
+#endif
+static int UserSTAT;
+
+int
+UserContext()
+{
+#ifndef USE_SETEUID
+ if (eff_uid == real_uid && eff_gid == real_gid)
+ return 1;
+ Usersigcld = signal(SIGCHLD, SIG_DFL);
+ debug("UserContext: forking.\n");
+ switch (UserPID = fork()) {
+ case -1:
+ Msg(errno, "fork");
+ return -1;
+ case 0:
+ signal(SIGHUP, SIG_DFL);
+ signal(SIGINT, SIG_IGN);
+ signal(SIGQUIT, SIG_DFL);
+ signal(SIGTERM, SIG_DFL);
+# ifdef BSDJOBS
+ signal(SIGTTIN, SIG_DFL);
+ signal(SIGTTOU, SIG_DFL);
+# endif
+ setuid(real_uid);
+ setgid(real_gid);
+ return 1;
+ default:
+ return 0;
+ }
+#else
+ xseteuid(real_uid);
+ xsetegid(real_gid);
+ return 1;
+#endif
+}
+
+void
+UserReturn(int val)
+{
+#ifndef USE_SETEUID
+ if (eff_uid == real_uid && eff_gid == real_gid)
+ UserSTAT = val;
+ else
+ _exit(val);
+#else
+ xseteuid(eff_uid);
+ xsetegid(eff_gid);
+ UserSTAT = val;
+#endif
+}
+
+int
+UserStatus()
+{
+#ifndef USE_SETEUID
+ int i;
+# ifdef BSDWAIT
+ union wait wstat;
+# else
+ int wstat;
+# endif
+
+ if (eff_uid == real_uid && eff_gid == real_gid)
+ return UserSTAT;
+ if (UserPID < 0)
+ return -1;
+ while ((errno = 0, i = wait(&wstat)) != UserPID)
+ if (i < 0 && errno != EINTR)
+ break;
+ (void)signal(SIGCHLD, Usersigcld);
+ if (i == -1)
+ return -1;
+ return WEXITSTATUS(wstat);
+#else
+ return UserSTAT;
+#endif
+}
+
+#ifndef HAVE_RENAME
+int
+rename(char *old, char *new)
+{
+ if (link(old, new) < 0)
+ return -1;
+ return unlink(old);
+}
+#endif
+
+int
+AddXChar(char *buf, int ch)
+{
+ char *p = buf;
+
+ if (ch < ' ' || ch == 0x7f) {
+ *p++ = '^';
+ *p++ = ch ^ 0x40;
+ } else if (ch >= 0x80) {
+ *p++ = '\\';
+ *p++ = (ch >> 6 & 7) + '0';
+ *p++ = (ch >> 3 & 7) + '0';
+ *p++ = (ch >> 0 & 7) + '0';
+ } else
+ *p++ = ch;
+ return p - buf;
+}
+
+int
+AddXChars(char *buf, int len, char *str)
+{
+ char *p;
+
+ if (str == 0) {
+ *buf = 0;
+ return 0;
+ }
+ len -= 4; /* longest sequence produced by AddXChar() */
+ for (p = buf; p < buf + len && *str; str++) {
+ if (*str == ' ')
+ *p++ = *str;
+ else
+ p += AddXChar(p, *str);
+ }
+ *p = 0;
+ return p - buf;
+}
+
+#ifdef DEBUG
+void
+opendebug(int new, int shout)
+{
+ char buf[256];
+
+#ifdef _MODE_T
+ mode_t oumask = umask(0);
+#else
+ int oumask = umask(0);
+#endif
+
+ ASSERT(!dfp);
+
+ (void)mkdir(DEBUGDIR, 0777);
+ sprintf(buf, shout ?
+ "%s/SCREEN.%d" : "%s/screen.%d", DEBUGDIR, getpid());
+ if (!(dfp = fopen(buf, new ? "w" : "a")))
+ dfp = stderr;
+ else
+ (void)chmod(buf, 0666);
+
+ (void)umask(oumask);
+ debug("opendebug: done.\n");
+}
+#endif /* DEBUG */
+
+void
+sleep1000(int msec)
+{
+ struct timeval t;
+
+ t.tv_sec = (long)(msec / 1000);
+ t.tv_usec = (long)((msec % 1000) * 1000);
+ select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &t);
+}
+
+/*
+ * This uses either setenv() or putenv(). If it is putenv() we cannot dare
+ * to free the buffer after putenv(), unless it it the one found in putenv.c
+ */
+void
+xsetenv(char *var, char *value)
+{
+#ifndef USESETENV
+ char *buf;
+ int l;
+
+ if ((buf = (char *)malloc((l = strlen(var)) +
+ strlen(value) + 2)) == NULL) {
+ Msg(0, strnomem);
+ return;
+ }
+ strcpy(buf, var);
+ buf[l] = '=';
+ strcpy(buf + l + 1, value);
+ putenv(buf);
+# ifdef NEEDPUTENV
+ /*
+ * we use our own putenv(), knowing that it does a malloc()
+ * the string space, we can free our buf now.
+ */
+ free(buf);
+# else /* NEEDPUTENV */
+ /*
+ * For all sysv-ish systems that link a standard putenv()
+ * the string-space buf is added to the environment and must not
+ * be freed, or modified.
+ * We are sorry to say that memory is lost here, when setting
+ * the same variable again and again.
+ */
+# endif /* NEEDPUTENV */
+#else /* USESETENV */
+# if HAVE_SETENV_3
+ setenv(var, value, 1);
+# else
+ setenv(var, value);
+# endif /* HAVE_SETENV_3 */
+#endif /* USESETENV */
+}
+
+#ifdef TERMINFO
+/*
+ * This is a replacement for the buggy _delay function from the termcap
+ * emulation of libcurses, which ignores ospeed.
+ */
+int
+_delay(register int delay, int (*outc) __P((int)))
+{
+ int pad;
+ extern short ospeed;
+ static short osp2pad[] = {
+ 0,2000,1333,909,743,666,500,333,166,83,55,41,20,10,5,2,1,1
+ };
+
+ if (ospeed <= 0 || ospeed >= (int)(sizeof(osp2pad)/sizeof(*osp2pad)))
+ return 0;
+ pad =osp2pad[ospeed];
+ delay = (delay + pad / 2) / pad;
+ while (delay-- > 0)
+ (*outc)(0);
+ return 0;
+}
+
+#endif /* TERMINFO */
+
+#ifndef USEVARARGS
+
+# define xva_arg(s, t, tn) (*(t *)(s += xsnoff(tn, 0, 0), s - xsnoff(tn, 0, 0)))
+# define xva_list char *
+
+static int
+xsnoff(int a, char *b, int c)
+{
+ return a ? (char *)&c - (char *)&b : (char *)&b - (char *)&a;
+}
+
+int
+xsnprintf(char *s, int n, char *fmt, unsigned long p1, p2, p3, p4, p5, p6)
+{
+ int xvsnprintf __P((char *, int, char *, xva_list));
+ return xvsnprintf(s, n, fmt, (char *)&fmt + xsnoff(1, 0, 0));
+}
+
+#else
+
+# define xva_arg(s, t, tn) va_arg(s, t)
+# define xva_list va_list
+
+#endif
+
+#if !defined(USEVARARGS) || !defined(HAVE_VSNPRINTF)
+
+int
+xvsnprintf(char *s, int n, char *fmt, xva_list stack)
+{
+ char *f, *sf = 0;
+ int i, on, argl = 0;
+ char myf[10], buf[20];
+ char *arg, *myfp;
+
+ on = n;
+ f = fmt;
+ arg = 0;
+ while (arg || (sf = index(f, '%')) || (sf = f + strlen(f))) {
+ if (arg == 0) {
+ arg = f;
+ argl = sf - f;
+ }
+ if (argl) {
+ i = argl > n - 1 ? n - 1 : argl;
+ strncpy(s, arg, i);
+ s += i;
+ n -= i;
+ if (i < argl) {
+ *s = 0;
+ return on;
+ }
+ }
+ arg = 0;
+ if (sf == 0)
+ continue;
+ f = sf;
+ sf = 0;
+ if (!*f)
+ break;
+ myfp = myf;
+ *myfp++ = *f++;
+ while (((*f >= '0' && *f <= '9') || *f == '#') &&
+ myfp - myf < 8)
+ *myfp++ = *f++;
+ *myfp++ = *f;
+ *myfp = 0;
+ if (!*f++)
+ break;
+ switch (f[-1]) {
+ case '%':
+ arg = "%";
+ break;
+ case 'c':
+ case 'o':
+ case 'd':
+ case 'x':
+ i = xva_arg(stack, int, 0);
+ sprintf(buf, myf, i);
+ arg = buf;
+ break;
+ case 's':
+ arg = xva_arg(stack, char *, 1);
+ if (arg == 0)
+ arg = "NULL";
+ break;
+ default:
+ arg = "";
+ break;
+ }
+ argl = strlen(arg);
+ }
+ *s = 0;
+ return on - n;
+}
+
+#endif
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