New file: from Paul Eggert.

2 files changed, 402 insertions, 0 deletions

diff --git a/lib/sig2str.c b/lib/sig2str.c
new file mode 100644
index 000000000..1edc9f119
--- /dev/null
+++ b/lib/sig2str.c
@@ -0,0 +1,353 @@
+/* sig2str.c -- convert between signal names and numbers
+
+   Copyright (C) 2002 Free Software Foundation, Inc.
+
+   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 2, 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; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Written by Paul Eggert.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <limits.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#if HAVE_SYS_WAIT_H
+# include <sys/wait.h>
+#endif
+#ifndef WTERMSIG
+# define WTERMSIG(s) ((s) & 0x7F)
+#endif
+
+#include "sig2str.h"
+
+#ifndef SIGRTMIN
+# define SIGRTMIN 0
+# undef SIGRTMAX
+#endif
+#ifndef SIGRTMAX
+# define SIGRTMAX (SIGRTMIN - 1)
+#endif
+
+#define NUMNAME(name) { SIG##name, #name }
+
+/* Signal names and numbers.  Put the preferred name first.  */
+static struct numname { int num; char const name[8]; } numname_table[] =
+  {
+    /* Signals required by POSIX 1003.1-2001 base, listed in
+       traditional numeric order.  */
+#ifdef SIGHUP
+    NUMNAME (HUP),
+#endif
+#ifdef SIGINT
+    NUMNAME (INT),
+#endif
+#ifdef SIGQUIT
+    NUMNAME (QUIT),
+#endif
+#ifdef SIGILL
+    NUMNAME (ILL),
+#endif
+#ifdef SIGTRAP
+    NUMNAME (TRAP),
+#endif
+#ifdef SIGABRT
+    NUMNAME (ABRT),
+#endif
+#ifdef SIGFPE
+    NUMNAME (FPE),
+#endif
+#ifdef SIGKILL
+    NUMNAME (KILL),
+#endif
+#ifdef SIGBUS
+    NUMNAME (BUS),
+#endif
+#ifdef SIGSEGV
+    NUMNAME (SEGV),
+#endif
+#ifdef SIGPIPE
+    NUMNAME (PIPE),
+#endif
+#ifdef SIGALRM
+    NUMNAME (ALRM),
+#endif
+#ifdef SIGTERM
+    NUMNAME (TERM),
+#endif
+#ifdef SIGUSR1
+    NUMNAME (USR1),
+#endif
+#ifdef SIGUSR2
+    NUMNAME (USR2),
+#endif
+#ifdef SIGCHLD
+    NUMNAME (CHLD),
+#endif
+#ifdef SIGURG
+    NUMNAME (URG),
+#endif
+#ifdef SIGSTOP
+    NUMNAME (STOP),
+#endif
+#ifdef SIGTSTP
+    NUMNAME (TSTP),
+#endif
+#ifdef SIGCONT
+    NUMNAME (CONT),
+#endif
+#ifdef SIGTTIN
+    NUMNAME (TTIN),
+#endif
+#ifdef SIGTTOU
+    NUMNAME (TTOU),
+#endif
+
+    /* Signals required by POSIX 1003.1-2001 with the XSI extension.  */
+#ifdef SIGSYS
+    NUMNAME (SYS),
+#endif
+#ifdef SIGPOLL
+    NUMNAME (POLL),
+#endif
+#ifdef SIGVTALRM
+    NUMNAME (VTALRM),
+#endif
+#ifdef SIGPROF
+    NUMNAME (PROF),
+#endif
+#ifdef SIGXCPU
+    NUMNAME (XCPU),
+#endif
+#ifdef SIGXFSZ
+    NUMNAME (XFSZ),
+#endif
+
+    /* Unix Version 7.  */
+#ifdef SIGIOT
+    NUMNAME (IOT),	/* Older name for ABRT.  */
+#endif
+#ifdef SIGEMT
+    NUMNAME (EMT),
+#endif
+
+    /* USG Unix.  */
+#ifdef SIGPHONE
+    NUMNAME (PHONE),
+#endif
+#ifdef SIGWIND
+    NUMNAME (WIND),
+#endif
+
+    /* Unix System V.  */
+#ifdef SIGCLD
+    NUMNAME (CLD),
+#endif
+#ifdef SIGPWR
+    NUMNAME (PWR),
+#endif
+
+    /* GNU/Linux 2.2 and Solaris 8.  */
+#ifdef SIGCANCEL
+    NUMNAME (CANCEL),
+#endif
+#ifdef SIGLWP
+    NUMNAME (LWP),
+#endif
+#ifdef SIGWAITING
+    NUMNAME (WAITING),
+#endif
+#ifdef SIGFREEZE
+    NUMNAME (FREEZE),
+#endif
+#ifdef SIGTHAW
+    NUMNAME (THAW),
+#endif
+#ifdef SIGLOST
+    NUMNAME (LOST),
+#endif
+#ifdef SIGWINCH
+    NUMNAME (WINCH),
+#endif
+
+    /* GNU/Linux 2.2.  */
+#ifdef SIGINFO
+    NUMNAME (INFO),
+#endif
+#ifdef SIGIO
+    NUMNAME (IO),
+#endif
+#ifdef SIGSTKFLT
+    NUMNAME (STKFLT),
+#endif
+
+    /* AIX 5L.  */
+#ifdef SIGDANGER
+    NUMNAME (DANGER),
+#endif
+#ifdef SIGGRANT
+    NUMNAME (GRANT),
+#endif
+#ifdef SIGMIGRATE
+    NUMNAME (MIGRATE),
+#endif
+#ifdef SIGMSG
+    NUMNAME (MSG),
+#endif
+#ifdef SIGPRE
+    NUMNAME (PRE),
+#endif
+#ifdef SIGRETRACT
+    NUMNAME (RETRACT),
+#endif
+#ifdef SIGSAK
+    NUMNAME (SAK),
+#endif
+#ifdef SIGSOUND
+    NUMNAME (SOUND),
+#endif
+
+    /* Older AIX versions.  */
+#ifdef SIGALRM1 
+    NUMNAME (ALRM1),	/* unknown; taken from Bash 2.05 */
+#endif
+#ifdef SIGKAP
+    NUMNAME (KAP),	/* Older name for SIGGRANT.  */
+#endif
+#ifdef SIGVIRT
+    NUMNAME (VIRT),	/* unknown; taken from Bash 2.05 */
+#endif
+#ifdef SIGWINDOW
+    NUMNAME (WINDOW),	/* Older name for SIGWINCH.  */
+#endif
+
+    /* BeOS */
+#ifdef SIGKILLTHR
+    NUMNAME (KILLTHR),
+#endif
+
+    /* Older HP-UX versions.  */
+#ifdef SIGDIL
+    NUMNAME (DIL),
+#endif
+
+    /* Korn shell and Bash, of uncertain vintage.  */
+    { 0, "EXIT" }
+  };
+
+#define NUMNAME_ENTRIES (sizeof numname_table / sizeof numname_table[0])
+
+/* ISDIGIT differs from isdigit, as follows:
+   - Its arg may be any int or unsigned int; it need not be an unsigned char.
+   - It's guaranteed to evaluate its argument exactly once.
+   - It's typically faster.
+   POSIX says that only '0' through '9' are digits.  Prefer ISDIGIT to
+   ISDIGIT_LOCALE unless it's important to use the locale's definition
+   of `digit' even when the host does not conform to POSIX.  */
+#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
+
+/* Convert the signal name SIGNAME to a signal number.  Return the
+   signal number if successful, -1 otherwise.  */
+
+static int
+str2signum (char const *signame)
+{
+  if (ISDIGIT (*signame))
+    {
+      char *endp;
+      long int n = strtol (signame, &endp, 10);
+      if (! *endp && n <= SIGNUM_BOUND)
+	return n;
+    }
+  else
+    {
+      int i;
+      for (i = 0; i < NUMNAME_ENTRIES; i++)
+	if (strcmp (numname_table[i].name, signame) == 0)
+	  return numname_table[i].num;
+
+      {
+	char *endp;
+	int rtmin = SIGRTMIN;
+	int rtmax = SIGRTMAX;
+
+	if (0 < rtmin && strncmp (signame, "RTMIN", 5) == 0)
+	  {
+	    long int n = strtol (signame + 5, &endp, 10);
+	    if (! *endp && 0 <= n && n <= rtmax - rtmin)
+	      return rtmin + n;
+	  }
+	else if (0 < rtmax && strncmp (signame, "RTMAX", 5) == 0)
+	  {
+	    long int n = strtol (signame + 5, &endp, 10);
+	    if (! *endp && rtmin - rtmax <= n && n <= 0)
+	      return rtmax + n;
+	  }
+      }
+    }
+
+  return -1;
+}
+
+/* Convert the signal name SIGNAME to the signal number *SIGNUM.
+   Return 0 if successful, -1 otherwise.  */
+
+int
+str2sig (char const *signame, int *signum)
+{
+  *signum = str2signum (signame);
+  return *signum < 0 ? -1 : 0;
+}
+
+/* Convert SIGNUM to a signal name in SIGNAME.  SIGNAME must point to
+   a buffer of at least SIG2STR_MAX bytes.  Return 0 if successful, -1
+   otherwise.  */
+
+int
+sig2str (int signum, char *signame)
+{
+  int i;
+  for (i = 0; i < NUMNAME_ENTRIES; i++)
+    if (numname_table[i].num == signum)
+      {
+	strcpy (signame, numname_table[i].name);
+	return 0;
+      }
+
+  {
+    int rtmin = SIGRTMIN;
+    int rtmax = SIGRTMAX;
+
+    if (! (rtmin <= signum && signum <= rtmax))
+      return -1;
+
+    if (signum <= rtmin + (rtmax - rtmin) / 2)
+      {
+	int delta = signum - rtmin;
+	sprintf (signame, delta ? "RTMIN+%d" : "RTMIN", delta);
+      }
+    else
+      {
+	int delta = rtmax - signum;
+	sprintf (signame, delta ? "RTMAX-%d" : "RTMAX", delta);
+      }
+
+    return 0;
+  }
+}
diff --git a/lib/sig2str.h b/lib/sig2str.h
new file mode 100644
index 000000000..3a46a8ce8
--- /dev/null
+++ b/lib/sig2str.h
@@ -0,0 +1,49 @@
+/* sig2str.h -- convert between signal names and numbers
+
+   Copyright (C) 2002 Free Software Foundation, Inc.
+
+   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 2, 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; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Written by Paul Eggert.  */
+
+/* Include <signal.h> before including this file.  */
+
+/* Don't override system declarations of SIG2STR_MAX, sig2str, str2sig.  */
+#ifndef SIG2STR_MAX
+
+/* Upper bound on the string length of an integer converted to string.
+   302 / 1000 is ceil (log10 (2.0)).  Subtract 1 for the sign bit;
+   add 1 for integer division truncation; add 1 more for a minus sign.  */
+# define INT_STRLEN_BOUND(t) ((sizeof (t) * CHAR_BIT - 1) * 302 / 1000 + 2)
+
+/* Size of a buffer needed to hold a signal name like "HUP".  */
+# define SIG2STR_MAX (sizeof "SIGRTMAX" + INT_STRLEN_BOUND (int) - 1)
+
+int sig2str (int, char *);
+int str2sig (char const *, int *);
+
+#endif
+
+/* An upper bound on signal numbers allowed by the system.  */
+
+#if defined _sys_nsig
+# define SIGNUM_BOUND (_sys_nsig - 1)
+#elif defined NSIG
+# define SIGNUM_BOUND (NSIG - 1)
+#elif defined WTERMSIG
+# define SIGNUM_BOUND WTERMSIG (~ 0)
+#else
+# define SIGNUM_BOUND 127
+#endif