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C library: Add strtoimax and strtoumax.

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This commit is contained in:
Gregory Nutt 2017-02-16 15:12:37 -06:00
parent 4ed3ae19d7
commit 2cfbf9c8d8
4 changed files with 245 additions and 7 deletions
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12
include/inttypes.h
View File

@ -177,13 +177,13 @@ extern "C"
* macros. Function prototypes shall be provided." * macros. Function prototypes shall be provided."
*/ */
intmax_t imaxabs(intmax_t); intmax_t imaxabs(intmax_t j);
imaxdiv_t imaxdiv(intmax_t, intmax_t); imaxdiv_t imaxdiv(intmax_t numer, intmax_t denom);
intmax_t strtoimax(const char *, char **, int); intmax_t strtoimax(FAR const char *nptr, FAR char **endptr, int base);
uintmax_t strtoumax(const char *, char **, int); uintmax_t strtoumax(FAR const char *nptr, FAR char **endptr, int base);
intmax_t wcstoimax(const wchar_t *, wchar_t **, int); intmax_t wcstoimax(FAR const wchar_t *nptr, FAR wchar_t **endptr, int base);
uintmax_t wcstoumax(const wchar_t *, wchar_t **, int); uintmax_t wcstoumax(FAR const wchar_t *nptr, FAR wchar_t **endptr, int base);
#undef EXTERN #undef EXTERN
#ifdef __cplusplus #ifdef __cplusplus

2
libc/inttypes/Make.defs
View File

@ -35,7 +35,7 @@
# Add the inttypes C files to the build # Add the inttypes C files to the build
CSRCS += lib_imaxabs.c CSRCS += lib_imaxabs.c lib_strtoimax.c lib_strtoumax.c
# Add the inttypes directory to the build # Add the inttypes directory to the build

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

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