2010. 6. 9. 19:15 Programming/C/C++
내가 만든 문자열 관련 함수
21살에 짠 코드는 벌써 8년 전... 헉스; 지금 봐도 아주 나뻐 보이지는 않는다.
#ifndef MYSTRING_H
#define MYSTRING_H
char *my_strcat( char *src, const char *tail )
{
char *s = src;
for( ; *src ; src++ );
for( ; *tail ; src++, tail++ )
*src = *tail;
*src = '\0';
return s;
}
char* my_strchr(char *src, int c)
{
int end=1;
for(;*src;++src)
{
if(*src == c)
{
end = 0;
break;
}
}
if(end == 1) return NULL;
else return src;
}
int my_strcmp(const char *s1, const char *s2)
{
int result;
for(; *s1!='\0' || *s2!='\0' ; s1++,s2++)
{
result = *s1 - *s2;
if(result != 0) return result;
}
return 0;
}
char *my_strcpy( char *dest, const char *src )
{
char *s = dest;
for( ; *src ; dest++, src++ )
*dest = *src;
*dest = '\0';
return s;
}
int my_strlen( const char *s1 )
{
int i = 0;
for( i = 0 ; *s1 ; i++, s1++ );
return i;
}
char* my_strlwr(char *s)
{
for(;*s;s++)
if( (*s > 64) && (*s < 91) ) *s = *s + 32;
return s;
}
char* my_strupr(char *s)
{
for(;*s;s++)
if( (*s > 96) && (*s < 123) ) *s = *s - 32;
return s;
}
char* my_strset(char *s,int ch)
{
for(;*s;s++)
*s = ch;
return s;
}
char* my_strrev(char *s)
{
char temp;
char* s_temp = s;
for(;*s_temp;s_temp++);
s_temp--;
for(;s_temp > s;s++,s_temp--)
{
temp = *s_temp;
*s_temp = *s;
*s = temp;
}
return s;
}
char* my_strstr(char *s1, char *s2)
{
char *s1_temp, *s2_temp;
for(;*s1;s1++)
{
s1_temp = s1;
s2_temp = s2;
if(*s1_temp == *s2_temp)
{
while(1)
{
if(!*s2_temp) return s1;
if(*s1_temp != *s2_temp) break;
if(!*s1_temp) break;
s1_temp++;
s2_temp++;
}
}
}
return NULL;
}
#endif
