C library: Add strtoimax and strtoumax.
This commit is contained in:
Gregory Nutt
parent
4ed3ae19d7
commit
2cfbf9c8d8
@ -177,13 +177,13 @@ extern "C"
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* macros. Function prototypes shall be provided."
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*/
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intmax_t imaxabs(intmax_t);
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imaxdiv_t imaxdiv(intmax_t, intmax_t);
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intmax_t strtoimax(const char *, char **, int);
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uintmax_t strtoumax(const char *, char **, int);
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intmax_t imaxabs(intmax_t j);
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imaxdiv_t imaxdiv(intmax_t numer, intmax_t denom);
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intmax_t strtoimax(FAR const char *nptr, FAR char **endptr, int base);
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uintmax_t strtoumax(FAR const char *nptr, FAR char **endptr, int base);
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intmax_t wcstoimax(const wchar_t *, wchar_t **, int);
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uintmax_t wcstoumax(const wchar_t *, wchar_t **, int);
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intmax_t wcstoimax(FAR const wchar_t *nptr, FAR wchar_t **endptr, int base);
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uintmax_t wcstoumax(FAR const wchar_t *nptr, FAR wchar_t **endptr, int base);
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#undef EXTERN
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#ifdef __cplusplus
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@ -35,7 +35,7 @@
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# Add the inttypes C files to the build
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CSRCS += lib_imaxabs.c
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CSRCS += lib_imaxabs.c lib_strtoimax.c lib_strtoumax.c
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# Add the inttypes directory to the build
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120
libc/inttypes/lib_strtoimax.c
Normal file
120
libc/inttypes/lib_strtoimax.c
Normal file
@ -0,0 +1,120 @@
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/****************************************************************************
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* libc/inttypes/lib_strtoimax.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <inttypes.h>
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#include <errno.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: strtoimax
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*
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* Description:
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* The strtoimax() function converts the initial part of the string in
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* nptr to a intmax_t integer value according to the given base, which
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* must be between 2 and 36 inclusive, or be the special value 0.
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*
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* Returns:
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* - The converted value, if the base and number are valid
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* - 0 if an error occurs, and set errno to:
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* * EINVAL if base < 2 or base > 36
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* - INTMAX_MIN or INTMAX_MAX, of correct sign, if an overflow occurs,
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* and set errno to:
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* * ERANGE if the number cannot be represented using intmax_t
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*
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****************************************************************************/
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intmax_t strtoimax(FAR const char *nptr, FAR char **endptr, int base)
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{
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uintmax_t accum = 0;
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bool negate = false;
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if (nptr)
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{
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/* Skip leading spaces */
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lib_skipspace(&nptr);
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/* Check for leading + or - */
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if (*nptr == '-')
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{
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negate = true;
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nptr++;
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}
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else if (*nptr == '+')
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{
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nptr++;
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}
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/* Get the unsigned value */
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accum = strtoull(nptr, endptr, base);
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/* Correct the sign of the result and check for overflow */
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if (negate)
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{
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const uintmax_t limit = ((uintmax_t)-(INTMAX_MIN + 1)) + 1;
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if (accum > limit)
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{
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set_errno(ERANGE);
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return INTMAX_MIN;
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}
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return (accum == limit) ? INTMAX_MIN : -(intmax_t)accum;
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}
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if (accum > INTMAX_MAX)
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{
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set_errno(ERANGE);
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return INTMAX_MAX;
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}
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}
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return (intmax_t)accum;
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}
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118
libc/inttypes/lib_strtoumax.c
Normal file
118
libc/inttypes/lib_strtoumax.c
Normal file
@ -0,0 +1,118 @@
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/****************************************************************************
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* /libc/inttypes/lib_strtoumax.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <inttypes.h>
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#include <errno.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: strtoumax
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*
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* Description:
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* The strtoumax() function converts the initial part of the string in
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* nptr to a long unsigned integer value according to the given base, which
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* must be between 2 and 36 inclusive, or be the special value 0.
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*
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* Returns:
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* - The converted value, if the base and number are valid
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* - 0 if an error occurs, and set errno to:
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* * EINVAL if base < 2 or base > 36
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* - UINTMAX_MAX if an overflow occurs, and set errno to:
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* * ERANGE if the number cannot be represented using uintmax_t
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*
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****************************************************************************/
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uintmax_t strtoumax(FAR const char *nptr, FAR char **endptr, int base)
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{
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uintmax_t accum = 0;
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uintmax_t prev;
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int value;
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if (nptr)
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{
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/* Skip leading spaces */
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lib_skipspace(&nptr);
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/* Check for unspecified base */
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base = lib_checkbase(base, &nptr);
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if (base < 0)
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{
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set_errno(EINVAL);
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return 0;
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}
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/* Accumulate each "digit" */
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while (lib_isbasedigit(*nptr, base, &value))
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{
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prev = accum;
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accum = accum*base + value;
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nptr++;
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/* Check for overflow */
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if (accum < prev)
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{
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set_errno(ERANGE);
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accum = UINTMAX_MAX;
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break;
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}
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}
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/* Return the final pointer to the unused value */
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if (endptr)
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{
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*endptr = (char *)nptr;
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}
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}
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return accum;
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}
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