I think you made it a pointer type since the functions said they needed a pointer, but you only got half the idea. sprintf and fnhash take pointers which point to what memory you want them to use. The memory doesn't create itself, so all you're giving them is a pointer to nothing. the commands mindlessly obey the command to write to invalid memory and cause a segmentation fault, hence why the crash is there despite the bug being far earlier.
This way when you pass 'instr' it will point to the 100 bytes of space it's defined as. Be careful not to go beyond it.
********************************
Following is not the real issue. The issue is with popen.
Plz continue forward with the thread to get a better picture.
********************************
Hi,
I am working on a customised ftp application. In it we have used sprintf to store a UNIX command... (7 Replies)
Hi,
Can someone help me to figure out whether this code is to write file to /tmp/TIMECLOCK directory or just to asign a variable with "/tmp/TIMECLOCK/name.log_copy.pid" as the string?
I am looking into an old C program and could not figure out where in the code that creates... (1 Reply)
Hi
My requirement is to convert the following to C++
char buffer;
sprintf(buffer,"%s %-50s %6s %-6d %s\n",a.substr(0,5),a.substr(10,20))
Since the buffer is of varying length, i cannot hardcode the value as 90.
i would like to convert the buffer to string object so that it can receive any... (1 Reply)
Hello,
In perl lang, I have create a string (@str) by sprintf but unfortunately when program printed it out, only I could saw a number like 1. Certainly printf doesn't problem. How I can convert a string that are result of sprintf to a common string format??!
Thanks in advance.
PLEASE HELP ME. (2 Replies)
I would like to assign the output of printf to a variable in perl , it give me back a "1" instead of the time. How can I stuff the variable with what printf returns?
Here is my code:
#!/usr/bin/perl
$time = localtime(time);... (3 Replies)
Hello again,
I don't know about regexp so I throw this question here:
How can I detect files where, for example:
sprintf (var1, "hello %s %s", sub1);
The problem here is that we have 2 %s and only a variable.
Or... the inverse:
sprintf (var1, "hello %s %s", sub1, sub2, sub3,...subn);
... (2 Replies)
Hi
I have many problems with a script. I have a script that formats a text file but always prints the same error when i try to execute it
The code is that:
{
if (NF==17){
print $0
}else{
fields=NF;
all=$0;
while... (2 Replies)
I need to right-pad with zeros a string by using (s)printf.
I looked up the manual and tried with
printf("%-19s", buffer);
which right-pad the string with spaces. So I tried
printf("%019s", buffer);
which left-pad the string with zeros. So I tried both
printf("%-019s", buffer);... (9 Replies)
Hi,
Trying to join 2 files with awk (file1 has variable number of fields; file 2 has constant number of fields)
file1:
hook1|AA|BB|CC|DD
hook2|EE|FF
file2:
hook1|11|22
hook2|33|44
hook3|55|66
output:
hook1|11|22|AA|BB|CC|DD
hook2|33|44|EE|FF
hook3|55|66
What I tried so far:... (3 Replies)
Discussion started by: beca123456
3 Replies
LEARN ABOUT DEBIAN
mvwinstr
instr(3NCURSES)instr(3NCURSES)NAME
instr, innstr, winstr, winnstr, mvinstr, mvinnstr, mvwinstr, mvwinnstr - get a string of characters from a curses window
SYNOPSIS
#include <curses.h>
int instr(char *str);
int innstr(char *str, int n);
int winstr(WINDOW *win, char *str);
int winnstr(WINDOW *win, char *str, int n);
int mvinstr(int y, int x, char *str);
int mvinnstr(int y, int x, char *str, int n);
int mvwinstr(WINDOW *win, int y, int x, char *str);
int mvwinnstr(WINDOW *win, int y, int x, char *str, int n);
DESCRIPTION
These routines return a string of characters in str, extracted starting at the current cursor position in the named window. Attributes are
stripped from the characters. The four functions with n as the last argument return a leading substring at most n characters long (exclu-
sive of the trailing NUL).
RETURN VALUE
All of the functions return ERR upon failure, or the number of characters actually read into the string.
X/Open defines no error conditions. In this implementation, if the window parameter is null or the str parameter is null, a zero is
returned.
Functions with a "mv" prefix first perform a cursor movement using wmove, and return an error if the position is outside the window, or if
the window pointer is null.
NOTES
Note that all routines except winnstr may be macros.
PORTABILITY
SVr4 does not document whether a length limit includes or excludes the trailing NUL.
The ncurses library extends the XSI description by allowing a negative value for n. In this case, the functions return the string ending
at the right margin.
SEE ALSO ncurses(3NCURSES).
instr(3NCURSES)