将字符串设置为 C 中的 substring

Question

I have a long string that I want to strip off the end. I want to get rid of everything after the character "<" (inclusively). Here is the code that works:

char *end;
end = strchr(mystring, '<');
mystring[strlen(mystring) - strlen(end)] = '\0';

So if mystring was

"asdfjk234klsjadflnwer023jokmnasdf</tag>alskjdflk23<tag2>akjsldfjsdf</tag2>blabla"

this code would return

"asdfjk234klsjadflnwer023jokmnasdf"

I'm wondering if this can be done in a easier way? I know I can increment a counter over each character in mystring till I find "<" and then used that int as the index, but that seems equally troublesome. All the other built-in string libraries don't seem useful but I'm sure I'm just looking at this in the wrong way. I haven't used C for years.

Any help is appreciated!

Answer 1

Sure. This is the idiomatic way to do it:

char *end;
end = strchr(mystring, '<');
if (end)
    *end = '\0';

Answer 2

How about *end = '\0'; rather than the mystring[strlen... part?

Answer 3

char *end;
end = strchr(mystring, '<');
if (end != NULL)
    *end = '\0';

Answer 4

strchr() returns a pointer to the character (if found), so:

if(end)
    *end = '\0';