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Full Discussion: How to trim the white space around a string in C program
Top Forums Programming How to trim the white space around a string in C program Post 302244961 by calv on Thursday 9th of October 2008 04:03:36 AM
Old 10-09-2008
This is optimizing in the wrong place. Your algorithm is O(nē), with or without register. Trimming a string can be done in O(n), which is much more efficient. On the other hand the function has not that much variables, so the compiler will most probobly use reigisters for all of them anyway (if the strlen() call doesn't make that impossible)
 

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LEARN ABOUT V7

strlen

STRLEN(3)						     Linux Programmer's Manual							 STRLEN(3)

NAME

       strlen - calculate the length of a string

SYNOPSIS

       #include <string.h>

       size_t strlen(const char *s);

DESCRIPTION

       The strlen() function calculates the length of the string pointed to by s, excluding the terminating null byte ('').

RETURN VALUE

       The strlen() function returns the number of characters in the string pointed to by s.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |strlen()  | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, C89, C99, C11, SVr4, 4.3BSD.

SEE ALSO

       string(3), strnlen(3), wcslen(3), wcsnlen(3)

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2016-03-15								 STRLEN(3)
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