[hackers] [sbase] Add strtonum() in preparation to nuking estrtol() and friends || sin

[git]

commit 7cf5cdbffbe7ee3db0c3c4ab6f81d57ab15c44f5
Author: sin <s...@2f30.org>
Date:   Fri Jan 30 13:48:33 2015 +0000

    Add strtonum() in preparation to nuking estrtol() and friends

diff --git a/Makefile b/Makefile
index a420784..ff53f08 100644
--- a/Makefile
+++ b/Makefile
@@ -56,6 +56,7 @@ LIBUTILSRC =\
        libutil/strlcat.c\
        libutil/strlcpy.c\
        libutil/strsep.c\
+       libutil/strtonum.c\
        libutil/unescape.c
 
 LIB = $(LIBUTF) $(LIBUTIL)
diff --git a/libutil/strtonum.c b/libutil/strtonum.c
new file mode 100644
index 0000000..7d0b583
--- /dev/null
+++ b/libutil/strtonum.c
@@ -0,0 +1,67 @@
+/*     $OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 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>
+
+#include "../util.h"
+
+#define        INVALID         1
+#define        TOOSMALL        2
+#define        TOOLARGE        3
+
+long long
+strtonum(const char *numstr, long long minval, long long maxval,
+         const char **errstrp)
+{
+       long long ll = 0;
+       int error = 0;
+       char *ep;
+       struct errval {
+               const char *errstr;
+               int err;
+       } ev[4] = {
+               { NULL,         0 },
+               { "invalid",    EINVAL },
+               { "too small",  ERANGE },
+               { "too large",  ERANGE },
+       };
+
+       ev[0].err = errno;
+       errno = 0;
+       if (minval > maxval) {
+               error = INVALID;
+       } else {
+               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;
+       }
+       if (errstrp != NULL)
+               *errstrp = ev[error].errstr;
+       errno = ev[error].err;
+       if (error)
+               ll = 0;
+
+       return (ll);
+}
diff --git a/util.h b/util.h
index f32f8b3..458a553 100644
--- a/util.h
+++ b/util.h
@@ -57,4 +57,5 @@ char *humansize(double);
 mode_t parsemode(const char *, mode_t, mode_t);
 void putword(const char *);
 void recurse(const char *, void (*)(const char *));
+long long strtonum(const char *, long long, long long, const char **);
 size_t unescape(char *);