diff options
Diffstat (limited to 'nuttx/libc/string/lib_strtoul.c')
-rw-r--r-- | nuttx/libc/string/lib_strtoul.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/nuttx/libc/string/lib_strtoul.c b/nuttx/libc/string/lib_strtoul.c new file mode 100644 index 000000000..8f27ae3f2 --- /dev/null +++ b/nuttx/libc/string/lib_strtoul.c @@ -0,0 +1,98 @@ +/**************************************************************************** + * /libc/string/lib_strtoul.c + * + * Copyright (C) 2007, 2009, 2011 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 <stdlib.h> + +#include "lib_internal.h" + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: strtoul + * + * Description: + * The strtol() 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. + * + * Warning: does not check for integer overflow! + * + ****************************************************************************/ + +unsigned long strtoul(const char *nptr, char **endptr, int base) +{ + unsigned long accum = 0; + int value; + + if (nptr) + { + /* Skip leading spaces */ + + lib_skipspace(&nptr); + + /* Check for unspecified base */ + + base = lib_checkbase(base, &nptr); + + /* Accumulate each "digit" */ + + while (lib_isbasedigit(*nptr, base, &value)) + { + accum = accum*base + value; + nptr++; + } + + /* Return the final pointer to the unused value */ + + if (endptr) + { + *endptr = (char *)nptr; + } + } + return accum; +} + |