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author | Manuel Novoa III <mjn3@codepoet.org> | 2003-03-19 12:13:01 +0300 |
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committer | Manuel Novoa III <mjn3@codepoet.org> | 2003-03-19 12:13:01 +0300 |
commit | cad5364599eb5062d59e0c397ed638ddd61a8d5d (patch) | |
tree | a318d0f03aa076c74b576ea45dc543a5669e8e91 /libbb/xgetularg.c | |
parent | e01f9662a5bd5d91be4f6b3941b57fff73cd5af1 (diff) |
Major coreutils update.
Diffstat (limited to 'libbb/xgetularg.c')
-rw-r--r-- | libbb/xgetularg.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/libbb/xgetularg.c b/libbb/xgetularg.c new file mode 100644 index 000000000..d743520c3 --- /dev/null +++ b/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 |