implementing substring in C

[anand102]

hi,


i want to implement substr function in C for getting substring. if somebody has already done so then pls
give me your code.


thanks

 

[Cagliostro]

this is a function which return -1 if substring is not find and its position if yes:
int find(char*x, char*y)
{
int max_search = strlen(x) - strlen;
int i;
int len_earch = strlen;
if(max_search<0) return -1;
for(i=0;i<max_search;i++)
{
if(!strncmp(x[i],y,len_search)return i;
}
return -1;
}

you'll use it like:
char* a = &quot;hello word&quot;;
char* b = &quot;hello&quot;;
int pos = find(a,b);
John Fill

ivfmd@mail.md

 

[MemoryLeak]

anand102,

In case you're not trying to implement 'substr' as some sort of training assignment:

The C run-time library has a function that does this for you - strstr.

Regards

 

[anand102]

actually i am looking for version of tpye :


substr(str, pos1,pos1)

which return me substring between pos1 and pos1 in orinignal string str.


thnaks

 

[Cagliostro]

just use strncpy.

char* substr( char str, pos1, pos2)
{
char* x = malloc(pos2-pos1+1);
strncpy(x,str[pos1],pos2-pos1);
} John Fill

ivfmd@mail.md