diff options
Diffstat (limited to 'libbb/parse_number.c')
| -rw-r--r-- | libbb/parse_number.c | 84 |
1 files changed, 39 insertions, 45 deletions
diff --git a/libbb/parse_number.c b/libbb/parse_number.c index 755a357ad..92ad6a216 100644 --- a/libbb/parse_number.c +++ b/libbb/parse_number.c @@ -1,70 +1,64 @@ /* vi: set sw=4 ts=4: */ /* - * Utility routines. + * bb_xparse_number implementation for busybox * - * Copyright (C) many different people. If you wrote this, please - * acknowledge your work. + * 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 + * 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 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * */ -#include <stdio.h> -#include <string.h> #include <stdlib.h> +#include <string.h> +#include <limits.h> +#include <errno.h> +#include <assert.h> #include "libbb.h" - -unsigned long parse_number(const char *numstr, - const struct suffix_mult *suffixes) +extern +unsigned long bb_xparse_number(const char *numstr, + const struct suffix_mult *suffixes) { - const struct suffix_mult *sm; - unsigned long int ret; - int len; - char *end; + unsigned long int r; + char *e; + int old_errno; - ret = strtoul(numstr, &end, 10); - if (numstr == end) - error_msg_and_die("invalid number `%s'", numstr); - while (end[0] != '\0') { - sm = suffixes; - while ( sm != 0 ) { - if(sm->suffix) { - len = strlen(sm->suffix); - if (strncmp(sm->suffix, end, len) == 0) { - ret *= sm->mult; - end += len; - break; + /* 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(numstr, &e, 10); + + if ((numstr != e) && !errno) { + errno = old_errno; /* Ok. So restore errno. */ + if (!*e) { + return r; + } + if (suffixes) { + assert(suffixes->suffix); /* No nul suffixes. */ + do { + if (strcmp(suffixes->suffix, e) == 0) { + if (ULONG_MAX / suffixes->mult < r) { /* Overflow! */ + break; + } + return r * suffixes->mult; } - sm++; - - } else - sm = 0; + ++suffixes; + } while (suffixes->suffix); } - if (sm == 0) - error_msg_and_die("invalid number `%s'", numstr); } - return ret; + bb_error_msg_and_die("invalid number `%s'", numstr); } - - -/* END CODE */ -/* -Local Variables: -c-file-style: "linux" -c-basic-offset: 4 -tab-width: 4 -End: -*/ |