strtonum, a nicer version of strtoll, by millert and myself.

ok deraadt@ millert@

3 files changed, 191 insertions, 2 deletions

diff --git a/lib/libc/stdlib/Makefile.inc b/lib/libc/stdlib/Makefile.inc
index 74f8ff5e7a5..e24eb8d4a5b 100644
--- a/lib/libc/stdlib/Makefile.inc
+++ b/lib/libc/stdlib/Makefile.inc
@@ -7,7 +7,8 @@ SRCS+=	a64l.c abort.c atexit.c atoi.c atof.c atol.c atoll.c bsearch.c \
 	calloc.c cfree.c exit.c ecvt.c gcvt.c getenv.c getopt_long.c \
 	getsubopt.c heapsort.c l64a.c llabs.c lsearch.c malloc.c merge.c \
 	multibyte.c putenv.c qsort.c radixsort.c rand.c random.c realpath.c \
-	setenv.c strtod.c strtol.c strtoll.c strtoul.c strtoull.c system.c \
+	setenv.c strtod.c strtol.c strtoll.c strtonum.c strtoul.c strtoull.c \
+	system.c \
 	tfind.c tsearch.c _rand48.c drand48.c erand48.c jrand48.c lcong48.c \
 	lrand48.c mrand48.c nrand48.c seed48.c srand48.c qabs.c qdiv.c
 
@@ -42,7 +43,7 @@ MAN+=	a64l.3 abort.3 abs.3 alloca.3 atexit.3 atof.3 atoi.3 atol.3 atoll.3 \
 	bsearch.3 div.3 ecvt.3 exit.3 getenv.3 getopt.3 getopt_long.3 \
 	getsubopt.3 insque.3 labs.3 ldiv.3 lsearch.3 malloc.3 qabs.3 \
 	qdiv.3 qsort.3 radixsort.3 rand48.3 rand.3 random.3 realpath.3 \
-	strtod.3 strtol.3 strtoul.3 system.3 tsearch.3
+	strtod.3 strtonum.3 strtol.3 strtoul.3 system.3 tsearch.3
 
 MLINKS+=ecvt.3 fcvt.3 ecvt.3 gcvt.3
 MLINKS+=getenv.3 setenv.3 getenv.3 unsetenv.3 getenv.3 putenv.3
diff --git a/lib/libc/stdlib/strtonum.3 b/lib/libc/stdlib/strtonum.3
new file mode 100644
index 00000000000..31aae9075bd
--- /dev/null
+++ b/lib/libc/stdlib/strtonum.3
@@ -0,0 +1,114 @@
+.\" Copyright (c) 1990, 1991 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Chris Torek and the American National Standards Committee X3,
+.\" on Information Processing Systems.
+.\"
+.\" 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. 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.
+.\"
+.\"	$OpenBSD: strtonum.3,v 1.1 2004/05/03 17:09:24 tedu Exp $
+.\"
+.Dd April 29, 2004
+.Dt STRTONUM 3
+.Os
+.Sh NAME
+.Nm strtonum
+.Nd "reliably convert string value to an integer"
+.Sh SYNOPSIS
+.Fd #include <stdlib.h>
+.Fd #include <limits.h>
+.Ft unsigned long long
+.Fo strtonum
+.Fa "const char *nptr"
+.Fa "long long minval"
+.Fa "unsigned long long maxval"
+.Fa "const char **errstr"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn strtonum
+function converts the string in
+.Fa nptr
+to an
+.Li unsigned long long
+value.
+The conversion is done according to base 10.
+Negative values may be obtained by casting the result.
+.Pp
+The string may begin with an arbitrary amount of whitespace
+(as determined by
+.Xr isspace 3 )
+followed by a single optional
+.Ql +
+or
+.Ql -
+sign.
+.Pp
+The remainder of the string is converted to an
+.Li unsigned long long
+value in the obvious manner,
+stopping at the first character which is not a valid digit
+in the given base.
+.Pp
+The value obtained is then checked against the provided
+.Fa minval
+and
+.Fa maxval
+bounds.
+If
+.Fa errstr
+is non-null,
+.Fn strtonum
+stores an error string in
+.Fa *endptr
+indicating the failure.
+.Sh RETURN VALUES
+The
+.Fn strtol
+function returns the result of the conversion,
+unless the value would underflow or overflow.
+On error, 0 is returned.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er ERANGE
+The given string was out of range.
+.It Bq Er EINVAL
+The given string did not consist solely of a valid number.
+.El
+.Sh SEE ALSO
+.Xr atof 3 ,
+.Xr atoi 3 ,
+.Xr atol 3 ,
+.Xr atoll 3 ,
+.Xr sscanf 3 ,
+.Xr strtol 3 ,
+.Xr strtod 3 ,
+.Xr strtoul 3
+.Sh STANDARDS
+.Fn strtonum
+is an
+.Ox
+extension.
diff --git a/lib/libc/stdlib/strtonum.c b/lib/libc/stdlib/strtonum.c
new file mode 100644
index 00000000000..9ac0d34ee00
--- /dev/null
+++ b/lib/libc/stdlib/strtonum.c
@@ -0,0 +1,74 @@
+/* $OpenBSD: strtonum.c,v 1.1 2004/05/03 17:09:24 tedu Exp $ */
+/*
+ * Copyright (c) 2004 Ted Unangst and Todd Miller
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+
+#define INVALID 	1
+#define TOOSMALL 	2
+#define TOOLARGE 	3
+
+unsigned long long
+strtonum(const char *numstr, long long minval, unsigned long long maxval,
+    const char **errstrp)
+{
+	unsigned long long ull;
+	char *ep;
+	int error;
+	struct errval {
+		const char *errstr;
+		int errno;
+	} ev[4] = {
+		{ NULL,		0 },
+		{ "invalid",	EINVAL },
+		{ "too small",	ERANGE },
+		{ "too large",	ERANGE },
+	};
+
+	ev[0].errno = errno;
+	errno = 0;
+	error = 0;
+	ull = 0;
+	if (minval > maxval || maxval < minval ||
+	    (minval < 0 && maxval > LLONG_MAX))
+		error = INVALID;
+	else if (minval >= 0) {
+		ull = strtoull(numstr, &ep, 10);
+		if (numstr == ep || *ep != '\0')
+			error = INVALID;
+		else if ((ull == ULLONG_MAX && errno == ERANGE) || ull > maxval)
+			error = TOOLARGE;
+	} else {
+		long long ll = strtoll(numstr, &ep, 10);
+		if (numstr == ep || *ep != '\0')
+			error = INVALID;
+		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
+			error = TOOSMALL;
+		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
+			error = TOOLARGE;
+		ull = (unsigned long long)ll;
+	}
+	if (errstrp != NULL)
+		*errstrp = ev[error].errstr;
+	errno = ev[error].errno;
+	if (error)
+		ull = 0;
+
+	return (ull);
+}