No error but not executing Post: 302479447

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Top Forums Programming No error but not executing Post 302479447 by Corona688 on Friday 10th of December 2010 05:26:09 PM

12-10-2010

Registered User

Code:

char *the_file,*starting_string="Finally got it! \n\0";

As I said, strings in quotes already have a null terminator. The compiler adds them for you. So putting a \0 here is pointless, it already has one, it's just not being written to the file since strlen() doesn't count the NULL terminator as part of the string.

Which is fine, I think. You should be checking the length of the file, not just blindly reading memory. If you go beyond the end of the file in mmap-ed memory, that's either a segfault or a bus error -- a crash.

So stop using string functions already and just treat the_file like an array of characters.

Quote:

for(i=0;i<strlen(the_file);++i)

I repeat: strlen() only works for strings. the_file is not a string. use buf.st_size

Code:

{
if(*(the_file[i])>='0' && *(the_file[i])<='9')
*(the_file[i])='*';
sleep(1);
}

Instead of using my syntax or yours, you're trying to use both. either use the_file[i], or *(the_file + i). Note the lack of * in one of the two.

Quote:

code tag means???

Tags that surround code to make your code readable instead of a mess. If you don't understand how they work, hit the 'quote' button for my post here, I've used lots of them. [ code ] stuff that is code [ /code ] without the extra spaces between [ and ] .

Corona688

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LEARN ABOUT BSD

strncasecmp

STRING(3)						     Library Functions Manual							 STRING(3)

NAME

       strcat, strncat, strcmp, strncmp, strcasecmp, strncasecmp, strcpy, strncpy, strlen, index, rindex - string operations

SYNOPSIS

       #include <strings.h>

       char *strcat(s, append)
       char *s, *append;

       char *strncat(s, append, count)
       char *s, *append;
       int count;

       strcmp(s1, s2)
       char *s1, *s2;

       strncmp(s1, s2, count)
       char *s1, *s2;
       int count;

       strcasecmp(s1, s2)
       char *s1, *s2;

       strncasecmp(s1, s2, count)
       char *s1, *s2;
       int count;

       char *strcpy(to, from)
       char *to, *from;

       char *strncpy(to, from, count)
       char *to, *from;
       int count;

       strlen(s)
       char *s;

       char *index(s, c)
       char *s, c;

       char *rindex(s, c)
       char *s, c;

DESCRIPTION

       These functions operate on null-terminated strings.  They do not check for overflow of any receiving string.

       Strcat appends a copy of string append to the end of string s. Strncat copies at most count characters.	Both return a pointer to the null-
       terminated result.

       Strcmp compares its arguments and returns an integer greater than, equal to, or less than 0, according as s1 is	lexicographically  greater
       than,  equal to, or less than s2.  Strncmp makes the same comparison but looks at at most count characters.  Strcasecmp and strncasecmp are
       identical in function, but are case insensitive.  The returned lexicographic difference reflects a conversion to lower-case.

       Strcpy copies string from to to, stopping after the null character has been moved.  Strncpy  copies  exactly  count  characters,  appending
       nulls  if from is less than count characters in length; the target may not be null-terminated if the length of from is count or more.  Both
       return to.

       Strlen returns the number of non-null characters in s.

       Index (rindex) returns a pointer to the first (last) occurrence of character c in string s or zero if c does not occur in the string.  Set-
       ting c to NULL works.

4th Berkeley Distribution					 October 22, 1987							 STRING(3)

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