1 files changed, 160 insertions, 0 deletions

diff --git a/busybox/libbb/xgetularg.c b/busybox/libbb/xgetularg.c
new file mode 100644
index 000000000..e90085446
--- /dev/null
+++ b/busybox/libbb/xgetularg.c
@@ -0,0 +1,160 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * xgetularg* implementations for busybox
+ *
+ * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * 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 of the License, 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
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <ctype.h>
+#include <errno.h>
+#include <assert.h>
+#include "libbb.h"
+
+#ifdef L_xgetularg_bnd_sfx
+extern
+unsigned long bb_xgetularg_bnd_sfx(const char *arg, int base,
+                                                                   unsigned long lower,
+                                                                   unsigned long upper,
+                                                                   const struct suffix_mult *suffixes)
+{
+        unsigned long r;
+        int old_errno;
+        char *e;
+
+        assert(arg);
+
+        /* Disallow '-' and any leading whitespace.  Speed isn't critical here
+         * since we're parsing commandline args.  So make sure we get the
+         * actual isspace function rather than a larger macro implementaion. */
+        if ((*arg == '-') || (isspace)(*arg)) {
+                bb_show_usage();
+        }
+
+        /* Since this is a lib function, we're not allowed to reset errno to 0.
+         * Doing so could break an app that is deferring checking of errno.
+         * So, save the old value so that we can restore it if successful. */
+        old_errno = errno;
+        errno = 0;
+        r = strtoul(arg, &e, base);
+        /* Do the initial validity check.  Note: The standards do not
+         * guarantee that errno is set if no digits were found.  So we
+         * must test for this explicitly. */
+        if (errno || (arg == e)) {      /* error or no digits */
+                bb_show_usage();
+        }
+        errno = old_errno;      /* Ok.  So restore errno. */
+
+        /* Do optional suffix parsing.  Allow 'empty' suffix tables.
+         * Note that we also all nul suffixes with associated multipliers,
+         * to allow for scaling of the arg by some default multiplier. */
+
+        if (suffixes) {
+                while (suffixes->suffix) {
+                        if (strcmp(suffixes->suffix, e) == 0) {
+                                if (ULONG_MAX / suffixes->mult < r) {   /* Overflow! */
+                                        bb_show_usage();
+                                }
+                                ++e;
+                                r *= suffixes->mult;
+                                break;
+                        }
+                        ++suffixes;
+                }
+        }
+
+        /* Finally, check for illegal trailing chars and range limits. */
+        /* Note: although we allow leading space (via stroul), trailing space
+         * is an error.  It would be easy enough to allow though if desired. */
+        if (*e || (r < lower) || (r > upper)) {
+                bb_show_usage();
+        }
+
+        return r;
+}
+#endif
+
+#ifdef L_xgetlarg_bnd_sfx
+extern
+long bb_xgetlarg_bnd_sfx(const char *arg, int base,
+                                                 long lower,
+                                                 long upper,
+                                                 const struct suffix_mult *suffixes)
+{
+        unsigned long u = LONG_MAX;
+        long r;
+        const char *p = arg;
+
+        if ((*p == '-') && (p[1] != '+')) {
+                ++p;
+#if LONG_MAX == (-(LONG_MIN + 1))
+                ++u;    /* two's complement */
+#endif
+        }
+
+        r = bb_xgetularg_bnd_sfx(p, base, 0, u, suffixes);
+
+        if (*arg == '-') {
+                r = -r;
+        }
+
+        if ((r < lower) || (r > upper)) {
+                bb_show_usage();
+        }
+
+        return r;
+}
+#endif
+
+#ifdef L_getlarg10_sfx
+extern
+long bb_xgetlarg10_sfx(const char *arg, const struct suffix_mult *suffixes)
+{
+        return bb_xgetlarg_bnd_sfx(arg, 10, LONG_MIN, LONG_MAX, suffixes);
+}
+#endif
+
+#ifdef L_xgetularg_bnd
+extern
+unsigned long bb_xgetularg_bnd(const char *arg, int base,
+                                                           unsigned long lower,
+                                                           unsigned long upper)
+{
+        return bb_xgetularg_bnd_sfx(arg, base, lower, upper, NULL);
+}
+#endif
+
+#ifdef L_xgetularg10_bnd
+extern
+unsigned long bb_xgetularg10_bnd(const char *arg,
+                                                                 unsigned long lower,
+                                                                 unsigned long upper)
+{
+        return bb_xgetularg_bnd(arg, 10, lower, upper);
+}
+#endif
+
+#ifdef L_xgetularg10
+extern
+unsigned long bb_xgetularg10(const char *arg)
+{
+        return bb_xgetularg10_bnd(arg, 0, ULONG_MAX);
+}
+#endif