Note also that unless you are absolutely positive that that your arrays are large enough to hold the desired text, you should verify that the snprintf(), strncat(), etc. calls didn't truncate your buffer (instead of silently continuing with truncated data). For example, with the last example loop in post #4, consider adding error checking as follows:
This User Gave Thanks to Don Cragun For This Post:
I receive an integer as argument for a function.
within function definition i want it to be of type struct tm.
eg..
main()
{
int a;
......
}
function(...,..,a,..)
int a;
{
struct tm tm;
if(!a)
^ time(&a);
^ ... (4 Replies)
Hi,
How to replace any character in a file with a newline character using sed ..
Ex:
To replace ',' with newline
Input:
abcd,efgh,ijkl,mnop
Output:
abcd
efgh
ijkl
mnop
Thnx in advance.
Regards,
Sasidhar (5 Replies)
Hello,
I'm trying to write a method which will return the extension of a file given the file's name, e.g. test.txt should return txt. I'm using C so am limited to char pointers and arrays. Here is the code as I have it:
char* getext(char *file)
{
char *extension;
int i, j;... (5 Replies)
hello everybody!
i have aproblem! i dont know how to concatenate const char* with char
const char *buffer;
char *b;
sprintf(b,"result.txt");
strcat(buffer,b);
thanx in advance (4 Replies)
Can someone tell me how to do this?
Just a thought that entered my mind when learning about structs.
First thought was:
struct one
{
struct two;
}
struct two
{
three;
}
one->two->three
would this be how you would access "three"? (1 Reply)
in C i am using this code to get the c time or a time or m time
struct dirent *dir;
struct stat my;
stat(what, &my);
thetime = my.st_ctime;
How can i check if i have permission to check the c time of the file? (1 Reply)
Compiling xpp (The X Printing Panel) on SL6 (RHEL6 essentially):
xpp.cxx: In constructor ‘printFiles::printFiles(int, char**, int&)’:
xpp.cxx:200: error: invalid conversion from ‘const char*’ to ‘char*’
The same error with all c++ constructors - gcc 4.4.4.
If anyone can throw any light on... (8 Replies)
Hi,
I have received an application that stores some properties in a file. The existing struct looks like this:
struct TData
{
UINT uSizeIncludingStrings;
// copy of Telnet data struct
UINT uSize;
// basic properties:
TCHAR szHost; //defined in Sshconfig
UINT iPortNr;
TCHAR... (2 Replies)
Pointers are seeming to get the best of me and I get that error in my program.
Here is the code
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define REPORTHEADING1 " Employee Pay Hours Gross Tax Net\n"
#define REPORTHEADING2 " Name ... (1 Reply)
Discussion started by: Plum
1 Replies
LEARN ABOUT MOJAVE
strlcpy
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