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Diffstat (limited to 'nuttx/lib/string/lib_strtol.c')
-rw-r--r-- | nuttx/lib/string/lib_strtol.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/nuttx/lib/string/lib_strtol.c b/nuttx/lib/string/lib_strtol.c new file mode 100644 index 000000000..4f6904793 --- /dev/null +++ b/nuttx/lib/string/lib_strtol.c @@ -0,0 +1,103 @@ +/**************************************************************************** + * lib/string/lib_strtol.c + * + * Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 <stdlib.h> + +#include "lib_internal.h" + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: strtol + * + * Description: + * The strtol() function converts the initial part of the string in + * nptr to a long integer value according to the given base, which must be + * between 2 and 36 inclusive, or be the special value 0. + * + * Warning: does not check for integer overflow! + * + ****************************************************************************/ + +long strtol(const char *nptr, char **endptr, int base) +{ + unsigned 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 = strtoul(nptr, endptr, base); + + /* Correct the sign of the result */ + + if (negate) + { + return -(long)accum; + } + } + return (long)accum; +} + |