/**************************************************************************** * libs/libc/stdlib/lib_strtoll.c * * Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include "libc.h" #ifdef CONFIG_HAVE_LONG_LONG /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: strtoll * * Description: * The strtoll() function converts the initial part of the string in * nptr to a long long integer value according to the given base, which * must be between 2 and 36 inclusive, or be the special value 0. * * Returned Value: * - 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 * - LLONG_MIN or LLONG_MAX, of correct sign, if an overflow occurs, * and set errno to: * * ERANGE if the number cannot be represented using long long * ****************************************************************************/ long long strtoll(FAR const char *nptr, FAR char **endptr, int base) { unsigned long long 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 unsigned long long limit = ((unsigned long long)-(LLONG_MIN + 1)) + 1; if (accum > limit) { set_errno(ERANGE); return LLONG_MIN; } return (accum == limit) ? LLONG_MIN : -(long long)accum; } if (accum > LLONG_MAX) { set_errno(ERANGE); return LLONG_MAX; } } return (long long)accum; } #endif