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Diffstat (limited to '')
-rw-r--r-- | lib/isc/parseint.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/lib/isc/parseint.c b/lib/isc/parseint.c new file mode 100644 index 0000000..5859369 --- /dev/null +++ b/lib/isc/parseint.c @@ -0,0 +1,73 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + + +/*! \file */ + +#include <config.h> + +#include <ctype.h> +#include <errno.h> +#include <limits.h> +#include <inttypes.h> + +#include <isc/parseint.h> +#include <isc/result.h> +#include <isc/stdlib.h> + +isc_result_t +isc_parse_uint32(uint32_t *uip, const char *string, int base) { + unsigned long n; + uint32_t r; + char *e; + if (! isalnum((unsigned char)(string[0]))) + return (ISC_R_BADNUMBER); + errno = 0; + n = strtoul(string, &e, base); + if (*e != '\0') + return (ISC_R_BADNUMBER); + /* + * Where long is 64 bits we need to convert to 32 bits then test for + * equality. This is a no-op on 32 bit machines and a good compiler + * will optimise it away. + */ + r = (uint32_t)n; + if ((n == ULONG_MAX && errno == ERANGE) || (n != (unsigned long)r)) + return (ISC_R_RANGE); + *uip = r; + return (ISC_R_SUCCESS); +} + +isc_result_t +isc_parse_uint16(uint16_t *uip, const char *string, int base) { + uint32_t val; + isc_result_t result; + result = isc_parse_uint32(&val, string, base); + if (result != ISC_R_SUCCESS) + return (result); + if (val > 0xFFFF) + return (ISC_R_RANGE); + *uip = (uint16_t) val; + return (ISC_R_SUCCESS); +} + +isc_result_t +isc_parse_uint8(uint8_t *uip, const char *string, int base) { + uint32_t val; + isc_result_t result; + result = isc_parse_uint32(&val, string, base); + if (result != ISC_R_SUCCESS) + return (result); + if (val > 0xFF) + return (ISC_R_RANGE); + *uip = (uint8_t) val; + return (ISC_R_SUCCESS); +} |