Segment fault related to strlen.S Post: 302968007

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Top Forums Programming Segment fault related to strlen.S Post 302968007 by yifangt on Wednesday 2nd of March 2016 10:44:10 AM

03-02-2016

Registered User

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!):

Code:

void get_hashes(unsigned int hash[],  unsigned char *in)
{
    unsigned char *str = in;
    int pos = strlen((char *) in);    //This line is of problem!
    hash[0] = RSHash(str, pos);
    hash[1] = DJBHash(str, pos);
    hash[2] = FNVHash(str, pos);
    hash[3] = JSHash(str, pos);
    hash[4] = PJWHash(str, pos);
    hash[5] = SDBMHash(str, pos);
    hash[6] = DEKHash(str, pos);
    hash[7] = murmur(str, (uint64_t) pos, (uint64_t) pos);
}

Then I used gdb to debug, and I got this message:

Code:

Program received signal SIGSEGV, Segmentation fault.
strlen () at ../sysdeps/x86_64/strlen.S:106
106    ../sysdeps/x86_64/strlen.S: No such file or directory.

The problem line has been highlighted. Code for the whole program is attached. I used type cast to suppress the warnings at compiling without full understanding.
Can someone explain the error for me, and show me the correct fix?
Thanks a lot!

bitwiser04.txt (13.7 KB)

yifangt

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LEARN ABOUT PHP

strlen

STRLEN(3)								 1								 STRLEN(3)

strlen - Get string length

SYNOPSIS

       int strlen (string  $string)

DESCRIPTION

	Returns the length of the given $string.

PARAMETERS

	      o $string
		- The string being measured for length.

RETURN VALUES

	The length of the $string on success, and 0 if the $string is empty.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.0	|						    |
       |	|						    |
       |	|  Prior  versions  treated  arrays  as  the string |
       |	| Array, thus returning a string length  of  5	and |
       |	| emitting an E_NOTICE level error.		    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      A strlen(3) example

	      <?php
	      $str = 'abcdef';
	      echo strlen($str); // 6

	      $str = ' ab cd ';
	      echo strlen($str); // 7
	      ?>

NOTES

       Note

	      strlen(3) returns the number of bytes rather than the number of characters in a string.

       Note

	      strlen(3) returns NULL when executed on arrays, and an E_WARNING level error is emitted.

SEE ALSO

       count(3), grapheme_strlen(3), iconv_strlen(3), mb_strlen(3).

PHP Documentation Group 														 STRLEN(3)