hi all,
let say i have a pointer exit, and this exit will store some value. how can i store the value that the pointer points to into an array and then print them out from the array.
thanks in advance (2 Replies)
I'm pretty new at this UNIX stuff, and this may be a simple question but I'm kind of stuck :confused:
Let's say I have a large directory structure of .essay files,
where I saved all of the essays that I did over the last few years. Not all of the .essay files are in the same directory (all... (1 Reply)
Hi
i have the following structure
struct S
{
char Mod_num;
char val;
char chr_nm_cd;
}
I am reading a 2GB file and inserting into the structure and writing into a vector.
I feel like only vector will be a right option. I tried with multimap but it is memory intensive and hence i... (1 Reply)
Hi All,
I am using the array of pointers and storing the address of string.This is a global list.
So i am using extern to give the reference of this list to another file and using reading the data from this string.
But list is being corrupted and string is missing some characters in... (2 Replies)
I was given to create a backup of all files in a given directory(command line argument) into say /home/vishal/back and the back up files must be accordingly to the extension of the file i.e pdf files are saved in back/pdf doc files back/doc etc . I gave a recursive function to traverse through the... (1 Reply)
I am writing a script which will read a word and say how many vowels and consonants does the word contain. but i dont know how to traverse a string in shell scripting. if it was in C i'd have done something like this:
cout<<"plz enter the word"<<endl;
cin>>word;
int consonants, vowels;... (4 Replies)
Hello, I read from a book exercise for a challenge. How to print out each letter of char array a by two different pointers pa and ppa in the example?
I have tried my code for letter "r" by testing without full understanding as only the first one worked.
#include<stdio.h>
int main()
{
char... (17 Replies)
Hello,
I want to loop thru a vector composed of many entries as structure, which contains sequenceID and sequence. At looping, delete any structure if the sequence is a perfect-match substring of another sequence of any other structure, so that the resulted vector contains only unique sequences.... (1 Reply)
I am attempting to create an array of function pointers. The examples I follow to do this are from:
support.microsoft.com/en-us/help/30580/how-to-declare-an-array-of-pointers-to-functions-in-visual-c
... (3 Replies)
Discussion started by: spflanze
3 Replies
LEARN ABOUT MOJAVE
strlcat
STRLCPY(3) BSD Library Functions Manual STRLCPY(3)NAME
strlcpy, strlcat -- size-bounded string copying and concatenation
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <string.h>
size_t
strlcpy(char * restrict dst, const char * restrict src, size_t dstsize);
size_t
strlcat(char * restrict dst, const char * restrict src, size_t dstsize);
DESCRIPTION
The strlcpy() and strlcat() functions copy and concatenate strings with the same input parameters and output result as snprintf(3). They are
designed to be safer, more consistent, and less error prone replacements for the easily misused functions strncpy(3) and strncat(3).
strlcpy() and strlcat() take the full size of the destination buffer and guarantee NUL-termination if there is room. Note that room for the
NUL should be included in dstsize.
strlcpy() copies up to dstsize - 1 characters from the string src to dst, NUL-terminating the result if dstsize is not 0.
strlcat() appends string src to the end of dst. It will append at most dstsize - strlen(dst) - 1 characters. It will then NUL-terminate,
unless dstsize is 0 or the original dst string was longer than dstsize (in practice this should not happen as it means that either dstsize is
incorrect or that dst is not a proper string).
If the src and dst strings overlap, the behavior is undefined.
RETURN VALUES
Besides quibbles over the return type (size_t versus int) and signal handler safety (snprintf(3) is not entirely safe on some systems), the
following two are equivalent:
n = strlcpy(dst, src, len);
n = snprintf(dst, len, "%s", src);
Like snprintf(3), the strlcpy() and strlcat() functions return the total length of the string they tried to create. For strlcpy() that means
the length of src. For strlcat() that means the initial length of dst plus the length of src.
If the return value is >= dstsize, the output string has been truncated. It is the caller's responsibility to handle this.
EXAMPLES
The following code fragment illustrates the simple case:
char *s, *p, buf[BUFSIZ];
...
(void)strlcpy(buf, s, sizeof(buf));
(void)strlcat(buf, p, sizeof(buf));
To detect truncation, perhaps while building a pathname, something like the following might be used:
char *dir, *file, pname[MAXPATHLEN];
...
if (strlcpy(pname, dir, sizeof(pname)) >= sizeof(pname))
goto toolong;
if (strlcat(pname, file, sizeof(pname)) >= sizeof(pname))
goto toolong;
Since it is known how many characters were copied the first time, things can be sped up a bit by using a copy instead of an append:
char *dir, *file, pname[MAXPATHLEN];
size_t n;
...
n = strlcpy(pname, dir, sizeof(pname));
if (n >= sizeof(pname))
goto toolong;
if (strlcpy(pname + n, file, sizeof(pname) - n) >= sizeof(pname) - n)
goto toolong;
However, one may question the validity of such optimizations, as they defeat the whole purpose of strlcpy() and strlcat(). As a matter of
fact, the first version of this manual page got it wrong.
SEE ALSO snprintf(3), strncat(3), strncpy(3), wcslcpy(3)HISTORY
The strlcpy() and strlcat() functions first appeared in OpenBSD 2.4, and FreeBSD 3.3.
BSD February 26, 2016 BSD