Add a strsignal(3) (like strerror(3)) for libc compatability with other

systems. NetBSD, Linux, SVR4 etc all have it.

include/signal.h

@@ -44,6 +44,7 @@
 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
 extern __const char *__const sys_signame[NSIG];
 extern __const char *__const sys_siglist[NSIG];
+extern __const int sys_nsig;
 #endif
 
 __BEGIN_DECLS

include/string.h

@@ -86,6 +86,7 @@ char	*strdup __P((const char *));
 void	 strmode __P((int, char *));
 int	 strncasecmp __P((const char *, const char *, size_t));
 char	*strsep __P((char **, const char *));
+char	*strsignal __P((int));
 char	*strtok_r __P((char *, const char *, char **));
 void	 swab __P((const void *, void *, size_t));
 #endif

lib/libc/gen/psignal.3

@@ -36,6 +36,7 @@
 .Os BSD 4.2
 .Sh NAME
 .Nm psignal ,
+.Nm strsignal ,
 .Nm sys_siglist ,
 .Nm sys_signame
 .Nd system signal messages
@@ -43,16 +44,29 @@
 .Fd #include <signal.h>
 .Ft void
 .Fn psignal "unsigned sig" "const char *s"
+.Ft "char *"
+.Fn strsignal "unsigned sig"
 .Vt extern const char * const sys_siglist[];
 .Vt extern const char * const sys_signame[];
 .Sh DESCRIPTION
 The
 .Fn psignal
-function locates the descriptive message
+and
-string for the given signal number
+.Fn strsignal
+functions locate the descriptive message
+string for a signal number.
+.Pp
+The
+.Fn strsignal
+function accepts a signal number argument
+.Fa sig
+and returns a pointer to the corresponding message string.
+.Pp
+The
+.Fn psignal
+function accepts an signal number argument
 .Fa sig
 and writes it to the standard error.
-.Pp
 If the argument
 .Fa s
 is
@@ -86,7 +100,8 @@ and
 .Va sys_signame .
 .Sh SEE ALSO
 .Xr sigaction 2 ,
-.Xr perror 3
+.Xr perror 3 ,
+.Xr strerror 3
 .Sh HISTORY
 The
 .Fn psignal

lib/libc/gen/siglist.c

@@ -107,3 +107,4 @@ const char *const sys_siglist[NSIG] = {
 	"User defined signal 1",	/* SIGUSR1 */
 	"User defined signal 2"		/* SIGUSR2 */
 };
+const int sys_nsig = sizeof(sys_siglist) / sizeof(sys_siglist[0]);

lib/libc/string/Makefile.inc

@@ -1,5 +1,5 @@
 #	@(#)Makefile.inc	8.1 (Berkeley) 6/4/93
-#	$Id: Makefile.inc,v 1.14 1998/02/20 08:23:55 jb Exp $
+#	$Id: Makefile.inc,v 1.15 1999/01/19 23:45:48 jdp Exp $
 
 .PATH: ${.CURDIR}/../libc/${MACHINE_ARCH}/string ${.CURDIR}/../libc/string
 
@@ -10,7 +10,7 @@ MISRCS+=bcmp.c bcopy.c bzero.c ffs.c index.c memccpy.c memchr.c memcmp.c \
 	memcpy.c memmove.c memset.c rindex.c strcasecmp.c strcat.c strchr.c \
 	strcmp.c strcoll.c strcpy.c strcspn.c strdup.c strerror.c strlen.c \
 	strmode.c strncat.c strncmp.c strncpy.c strpbrk.c strrchr.c strsep.c \
-	strspn.c strstr.c strtok.c strxfrm.c swab.c
+	strsignal.c strspn.c strstr.c strtok.c strxfrm.c swab.c
 
 # machine-dependent string sources
 .include "${.CURDIR}/../libc/${MACHINE_ARCH}/string/Makefile.inc"
@@ -27,5 +27,6 @@ MLINKS+=strcat.3 strncat.3
 MLINKS+=strcmp.3 strncmp.3
 MLINKS+=strcpy.3 strncpy.3
 MLINKS+=strerror.3 perror.3 strerror.3 sys_errlist.3 strerror.3 sys_nerr.3
+MLINKS+=psignal.3 strsignal.3 psignal.3 sys_siglist.3 psignal.3 sys_signame.3
 MLINKS+=strtok.3 strtok_r.3
 .endif

lib/libc/string/strsignal.c

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)strerror.c	8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+
+#include <stdio.h>
+#include <string.h>
+#include <signal.h>
+
+char *
+strsignal(num)
+	int num;
+{
+#define	UPREFIX	"Unknown signal: "
+	static char ebuf[40] = UPREFIX;		/* 64-bit number + slop */
+	register unsigned int signum;
+	register char *p, *t;
+	char tmp[40];
+
+	signum = num;				/* convert to unsigned */
+	if (signum < sys_nsig)
+		return ((char *)sys_siglist[signum]);
+
+	/* Do this by hand, so we don't link to stdio(3). */
+	t = tmp;
+	if (num < 0)
+		signum = -signum;
+	do {
+		*t++ = "0123456789"[signum % 10];
+	} while (signum /= 10);
+	if (num < 0)
+		*t++ = '-';
+	for (p = ebuf + sizeof(UPREFIX) - 1;;) {
+		*p++ = *--t;
+		if (t <= tmp)
+			break;
+	}
+	*p = '\0';
+	return (ebuf);
+}