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Diffstat (limited to '')
| -rw-r--r-- | lib/util/smb_strtox.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/lib/util/smb_strtox.c b/lib/util/smb_strtox.c new file mode 100644 index 0000000..e57316e --- /dev/null +++ b/lib/util/smb_strtox.c @@ -0,0 +1,177 @@ +/* + * Unix SMB/CIFS implementation. + * + * Copyright (C) Swen Schillig 2019 + * + * ** NOTE! The following LGPL license applies to this file. + * ** This does NOT imply that all of Samba is released + * ** under the LGPL + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 3 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. +*/ + +#include "replace.h" +#include "smb_strtox.h" + +/** + * Convert a string to an unsigned long integer + * + * @param nptr pointer to string which is to be converted + * @param endptr [optional] reference to remainder of the string + * @param base base of the numbering scheme + * @param err error occured during conversion + * @flags controlling conversion feature + * @result result of the conversion as provided by strtoul + * + * The following flags are supported + * SMB_STR_STANDARD # raise error if negative or non-numeric + * SMB_STR_ALLOW_NEGATIVE # allow strings with a leading "-" + * SMB_STR_FULL_STR_CONV # entire string must be converted + * SMB_STR_ALLOW_NO_CONVERSION # allow empty strings or non-numeric + * SMB_STR_GLIBC_STANDARD # act exactly as the standard glibc strtoul + * + * The following errors are detected + * - wrong base + * - value overflow + * - string with a leading "-" indicating a negative number + * - no conversion due to empty string or not representing a number + */ +unsigned long int +smb_strtoul(const char *nptr, char **endptr, int base, int *err, int flags) +{ + unsigned long int val; + int saved_errno = errno; + char *needle = NULL; + char *tmp_endptr = NULL; + + errno = 0; + *err = 0; + + val = strtoul(nptr, &tmp_endptr, base); + + if (endptr != NULL) { + *endptr = tmp_endptr; + } + + if (errno != 0) { + *err = errno; + errno = saved_errno; + return val; + } + + if ((flags & SMB_STR_ALLOW_NO_CONVERSION) == 0) { + /* got an invalid number-string resulting in no conversion */ + if (nptr == tmp_endptr) { + *err = EINVAL; + goto out; + } + } + + if ((flags & SMB_STR_ALLOW_NEGATIVE ) == 0) { + /* did we convert a negative "number" ? */ + needle = strchr(nptr, '-'); + if (needle != NULL && needle < tmp_endptr) { + *err = EINVAL; + goto out; + } + } + + if ((flags & SMB_STR_FULL_STR_CONV) != 0) { + /* did we convert the entire string ? */ + if (tmp_endptr[0] != '\0') { + *err = EINVAL; + goto out; + } + } + +out: + errno = saved_errno; + return val; +} + +/** + * Convert a string to an unsigned long long integer + * + * @param nptr pointer to string which is to be converted + * @param endptr [optional] reference to remainder of the string + * @param base base of the numbering scheme + * @param err error occured during conversion + * @flags controlling conversion feature + * @result result of the conversion as provided by strtoull + * + * The following flags are supported + * SMB_STR_STANDARD # raise error if negative or non-numeric + * SMB_STR_ALLOW_NEGATIVE # allow strings with a leading "-" + * SMB_STR_FULL_STR_CONV # entire string must be converted + * SMB_STR_ALLOW_NO_CONVERSION # allow empty strings or non-numeric + * SMB_STR_GLIBC_STANDARD # act exactly as the standard glibc strtoul + * + * The following errors are detected + * - wrong base + * - value overflow + * - string with a leading "-" indicating a negative number + * - no conversion due to empty string or not representing a number + */ +unsigned long long int +smb_strtoull(const char *nptr, char **endptr, int base, int *err, int flags) +{ + unsigned long long int val; + int saved_errno = errno; + char *needle = NULL; + char *tmp_endptr = NULL; + + errno = 0; + *err = 0; + + val = strtoull(nptr, &tmp_endptr, base); + + if (endptr != NULL) { + *endptr = tmp_endptr; + } + + if (errno != 0) { + *err = errno; + errno = saved_errno; + return val; + } + + if ((flags & SMB_STR_ALLOW_NO_CONVERSION) == 0) { + /* got an invalid number-string resulting in no conversion */ + if (nptr == tmp_endptr) { + *err = EINVAL; + goto out; + } + } + + if ((flags & SMB_STR_ALLOW_NEGATIVE ) == 0) { + /* did we convert a negative "number" ? */ + needle = strchr(nptr, '-'); + if (needle != NULL && needle < tmp_endptr) { + *err = EINVAL; + goto out; + } + } + + if ((flags & SMB_STR_FULL_STR_CONV) != 0) { + /* did we convert the entire string ? */ + if (tmp_endptr[0] != '\0') { + *err = EINVAL; + goto out; + } + } + +out: + errno = saved_errno; + return val; +} |