diff options
Diffstat (limited to 'nuttx/libc/string/lib_isbasedigit.c')
-rw-r--r-- | nuttx/libc/string/lib_isbasedigit.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/nuttx/libc/string/lib_isbasedigit.c b/nuttx/libc/string/lib_isbasedigit.c new file mode 100644 index 000000000..a2421bf2a --- /dev/null +++ b/nuttx/libc/string/lib_isbasedigit.c @@ -0,0 +1,105 @@ +/**************************************************************************** + * lib/string/lib_isbasedigit.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 <stdbool.h> +#include <string.h> +#include <ctype.h> + +#include "lib_internal.h" + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: lib_isbasedigit + * + * Description: + * Given an ASCII character, ch, and a base (1-36) do two + * things: 1) Determine if ch is a valid charcter, and 2) + * convert ch to its binary value. + * + ****************************************************************************/ + +bool lib_isbasedigit(int ch, int base, int *value) +{ + bool ret = false; + int tmp = 0; + + if (base <= 10) + { + if (ch >= '0' && ch <= base + '0' - 1) + { + tmp = ch - '0'; + ret = true; + } + } + else if (base <= 36) + { + if (ch >= '0' && ch <= '9') + { + tmp = ch - '0'; + ret = true; + } + else if (ch >= 'a' && ch <= 'a' + base - 11) + { + tmp = ch - 'a' + 10; + ret = true; + } + else if (ch >= 'A' && ch <= 'A' + base - 11) + { + tmp = ch - 'A' + 10; + ret = true; + } + } + + if (value) + { + *value = tmp; + } + return ret; +} + + |