stdImpl.cpp

00001 /*
00002  * COPYRIGHT AND PERMISSION NOTICE
00003  * 
00004  * Copyright (c) 2003 Embedded Unit Project
00005  * 
00006  * All rights reserved.
00007  * 
00008  * Permission is hereby granted, free of charge, to any person obtaining 
00009  * a copy of this software and associated documentation files (the 
00010  * "Software"), to deal in the Software without restriction, including 
00011  * without limitation the rights to use, copy, modify, merge, publish, 
00012  * distribute, and/or sell copies of the Software, and to permit persons 
00013  * to whom the Software is furnished to do so, provided that the above 
00014  * copyright notice(s) and this permission notice appear in all copies 
00015  * of the Software and that both the above copyright notice(s) and this 
00016  * permission notice appear in supporting documentation.
00017  * 
00018  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
00019  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
00020  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT 
00021  * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
00022  * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY 
00023  * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER 
00024  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF 
00025  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 
00026  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
00027  * 
00028  * Except as contained in this notice, the name of a copyright holder 
00029  * shall not be used in advertising or otherwise to promote the sale, 
00030  * use or other dealings in this Software without prior written 
00031  * authorization of the copyright holder.
00032  *
00033  * $Id: stdImpl.c,v 1.3 2004/02/10 16:15:25 arms22 Exp $
00034  */
00035 #include "stdImpl.h"
00036 
00037 char* stdimpl_strcpy(char *dst, const char *src)
00038 {
00039     char *start = dst;
00040     char c;
00041     do {
00042         c = *src;
00043         *dst = c;
00044         src++;
00045         dst++;
00046     } while (c);
00047     return start;
00048 }
00049 
00050 char* stdimpl_strcat(char *dst, const char *src)
00051 {
00052     char *start = dst;
00053     char c;
00054     do {
00055         c = *dst;
00056         dst++;
00057     } while (c);
00058     dst--;
00059     do {
00060         c = *src;
00061         *dst = c;
00062         src++;
00063         dst++;
00064     } while (c);
00065     return start;
00066 }
00067 
00068 char* stdimpl_strncat(char *dst, const char *src,unsigned int count)
00069 {
00070     char *start = dst;
00071     char c;
00072     do {
00073         c = *dst;
00074         dst++;
00075     } while (c);
00076     dst--;
00077     if (count) {
00078         do {
00079             c = *src;
00080             *dst = c;
00081             src++;
00082             dst++;
00083             count--;
00084         } while (c && count);
00085         *dst = '\0';
00086     }
00087     return start;
00088 }
00089 
00090 int stdimpl_strlen(const char *str)
00091 {
00092     const char *estr = str;
00093     char c;
00094     do {
00095         c = *estr;
00096         estr++;
00097     } while (c);
00098     return ((int)(estr - str - 1));
00099 }
00100 
00101 int stdimpl_strcmp(const char *s1, const char *s2)
00102 {
00103     char c1,c2;
00104     do {
00105         c1 = *s1++;
00106         c2 = *s2++;
00107     } while ((c1) && (c2) && (c1==c2));
00108     return c1 - c2;
00109 }
00110 
00111 static char* _xtoa(unsigned long v,char *string, int r, int is_neg)
00112 {
00113     char *start = string;
00114     char buf[33],*p;
00115 
00116     p = buf;
00117 
00118     do {
00119         *p++ = "0123456789abcdef"[(v % r) & 0xf];
00120     } while (v /= r);
00121 
00122     if (is_neg) {
00123         *p++ = '-';
00124     }
00125 
00126     do {
00127         *string++ = *--p;
00128     } while (buf != p);
00129 
00130     *string = '\0';
00131 
00132     return start;
00133 }
00134 
00135 char* stdimpl_itoa(int v,char *string,int r)
00136 {
00137     if ((r == 10) && (v < 0)) {
00138         return _xtoa((unsigned long)(-v), string, r, 1);
00139     }
00140     return _xtoa((unsigned long)(v), string, r, 0);
00141 }