Natural Tiny Shell (NT-Shell) library is a tiny shell library for a small embedded system. The interface is really simple. You should only know ntshell_execute in ntshell.h. So you can port it to any embedded system easily. Please enjoy your small embedded system with it. :)
Dependents: NaturalTinyShell_TestProgram
ntlibc.c
- Committer:
- shintamainjp
- Date:
- 2011-05-22
- Revision:
- 0:7147d6024de8
File content as of revision 0:7147d6024de8:
/** * @file ntlibc.c * @author Shinichiro Nakamura * @brief NT-Shellで用いる小規模libcの実装。 */ /* * =============================================================== * Natural Tiny Shell (NT-Shell) * Version 0.0.6 * =============================================================== * Copyright (c) 2010-2011 Shinichiro Nakamura * * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software and associated documentation * files (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, * copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following * conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * =============================================================== */ #include "ntlibc.h" size_t ntlibc_strlen(const char *s) { const char *p = s; int cnt = 0; while (*p) { cnt++; p++; } return cnt; } char *ntlibc_strcpy(char *des, const char *src) { char *d = des; const char *s = src; while (*s) { *d = *s; d++; s++; } *d = '\0'; return des; } char *ntlibc_strcat(char *des, const char *src) { char *d = des; const char *s = src; while (*d) { d++; } while (*s) { *d = *s; d++; s++; } *d = '\0'; return des; } int ntlibc_strcmp(const char *s1, const char *s2) { char *p1 = (char *)s1; char *p2 = (char *)s2; while (*p1 || *p2) { if (*p1 != *p2) { return (*p1 < *p2) ? -1 : 1; } p1++; p2++; } if (*p1 == *p2) { return 0; } else { return (*p1 < *p2) ? -1 : 1; } } int ntlibc_strncmp(const char *s1, const char *s2, size_t n) { char *p1 = (char *)s1; char *p2 = (char *)s2; size_t len = 0; while (*p1 || *p2) { if (n <= len) { break; } if (*p1 != *p2) { return (*p1 < *p2) ? -1 : 1; } p1++; p2++; len++; } return 0; } #if 0 #include <stdio.h> int main(void); int main(void) { char *str_a = "That"; char *str_b = "The"; printf("strcmp(%s,%s) = %d, %d\n", str_a, str_b, strcmp(str_a, str_b), ntlibc_strcmp(str_a, str_b)); printf("strncmp(%s,%s,2) = %d, %d\n", str_a, str_b, strncmp(str_a, str_b, 2), ntlibc_strncmp(str_a, str_b, 2)); printf("strncmp(%s,%s,3) = %d, %d\n", str_a, str_b, strncmp(str_a, str_b, 3), ntlibc_strncmp(str_a, str_b, 3)); return 0; } #endif