pointer arithmetic vs. strlen() & strnlen()?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

PHP: declared variables, strlen vs isset

greetings, pretty new to php and i think i might be missing some fundamental limitation of isset. i have two php scripts below that are executed by crond, one using --host X and one that does not. and below that are three different attempts at generating a command line that will be executed. the...

2. Programming

Segment fault related to strlen.S

Hello, This function was copied into my code, which was compiled without error/warning, but when executed there is always Segmentation fault at the end after the output (which seems correct!): void get_hashes(unsigned int hash, unsigned char *in) { unsigned char *str = in; int pos =...

3. Programming

Pointer arithmetic for list of strings

When i want to use a list of strings char *list; i never understand it well. Here is an easy example. It took me long to figure it out, searching the web didn't help much: #include <stdio.h> int main(void) { char *list = {"foo", "bar", "baz"}; char **pl; int...

4. Programming

Pointer Arithmetic In C

I have a fundamental question on C pointer arithmetry.. Suppose i have a c string pointer already pointing to a valid location, Can I just do a charptr = charptr +1; to get to the next location, irregardless if my program is 32 or 64 bits? or should i do it this way: charptr =...

5. Programming

strlen for UTF-8

My OS (Debian) and gcc use the UTF-8 locale. This code says that the char size is 1 byte but the size of 'a' is really 4 bytes. int main(void) { setlocale(LC_ALL, "en_US.UTF-8"); printf("Char size: %i\nSize of char 'a': %i\nSize of Euro sign '�': %i\nLength of Euro sign: %i\n",...

6. Shell Programming and Scripting

PHP read large string & split in multidimensional arrays & assign fieldnames & write into MYSQL

Hi, I hope the title does not scare people to look into this thread but it describes roughly what I'm trying to do. I need a solution in PHP. I'm a programming beginner, so it might be that the approach to solve this, might be easier to solve with an other approach of someone else, so if you...

7. Programming

pass a pointer-to-pointer, or return a pointer?

If one wants to get a start address of a array or a string or a block of memory via a function, there are at least two methods to achieve it: (1) one is to pass a pointer-to-pointer parameter, like: int my_malloc(int size, char **pmem) { *pmem=(char *)malloc(size); if(*pmem==NULL)...

8. Programming

'strlen' of a constant string

In a declaration, I have: const char comment_begin = ""; const int comment_begin_len = strlen(comment_begin); const int comment_end_len = strlen(comment_end); When I compile, I get the warnings: emhttpc.c:64: warning: initializer element is not...

9. Shell Programming and Scripting

Problem with the strlen function in ksh

Hello, Just a little problem with the ksh function : strlen I want to use this function in this little ksh program : while read line ; do TOTO=$line TOTONB=strlen($TOTO) echo $TOTONB

10. Programming

Problems with Strlen

hello, i have a problem with strlen. I have written this: for(y=13,z=0; cInBuf!=' ';y++) { cBuf=cInBuf; z++; } len = strlen(cBuf); out=len/2; fprintf(outfile,"F%i",out); If strlen is e.g. 22, it write F22. I want to write F2F2. How can i do this?...

LEARN ABOUT MINIX

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)

Programming