Question

Possible Duplicate:
How do I trim leading/trailing whitespace in a standard way?

I need to remove all spaces from the beginning and at the end of the string for instance if my string is

"     hello     world.       "

(without quotes), I need to print

"hello     world."

I tried something like this:

size_t length = strlen (str);
for (newstr = str; *newstr; newstr++, length--) {
    while (isspace (*newstr)) 
        memmove (newstr, newstr + 1, length--);

but it removes all spaces.

How can I fix it?

Answer 1

No need to memmove. Just start at the starting point (scan until first nonspace character). Then, work from the back and find the first non-space character. Move ahead one and then replace with a null termination character.

char *s = str;
while(isspace(*s)) ++s;
char *t = str + strlen(str);
while(isspace(*--t));
*++t = '\0';