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-rw-r--r--libbb/xgetularg.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/libbb/xgetularg.c b/libbb/xgetularg.c
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+/* 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