705 questions
0
votes
2
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67
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C strlen() returns the wrong String length (character count) when using umlauts [duplicate]
I'm working on a C program, which takes an input in form of a parameter and then needs the length of the string to continue its work.
Unfortunately I'm facing a massive issue in form of a wrong ...
- 353
1
vote
2
answers
69
views
Unable to get length of arg - C [closed]
basically I'm trying to get the length (using strlen) of an argument, but i keep getting this error. From what I've understood it means that I'm giving an array of pointers to char arrays instead of a ...
- 23
2
votes
3
answers
160
views
Why is the strlen here equal to 25?
Just so I can confirm if what I think is going on is really going on. The following code prints out 25 when i give it the (26 letter) alphabet as an input, is it 'cause fgets always automatically sets ...
2
votes
1
answer
127
views
Why doesn't the compiler optimize strlen() calls in a loop, despite it being a pure function? And how would [[reproducible]] affect this?
I have two functions that convert a string to lowercase. The first one calls strlen() in every iteration, while the second one only calls it after modifying the string. I expected the compiler to ...
- 83
2
votes
3
answers
121
views
C strlen on char array
I'm new to programming, so I was practicing with C. Then I ran to a problem with my code:
#include <stdio.h>
#include <string.h>
int main()
{
char a[] = "Hello";
printf(&...
- 23
0
votes
1
answer
73
views
User input sanitization program, which takes a specific amount of arguments and passes the execution to a bash script
I am trying to write a little program, which is resistant against buffer overflow and similar vulnerabilities.
Since we cannot trust the user input, I thought it would be a good idea to concatenate ...
- 321
4
votes
0
answers
95
views
Is there a better way to search any byte from a long value?
In OPENJDK's StringSupport class, there are following codes checking if there could be a '\0' byte in a long value:
private static final long HIMAGIC_FOR_BYTES = 0x8080_8080_8080_8080L;
private static ...
- 307
3
votes
1
answer
159
views
Strlen function giving wrong length when there are non-english characters in string
I have a program that accepts non-english characters also as an input field. Because we use strlen, it has failed to give expected length while calculating the length of the string when there is a non-...
- 39
0
votes
0
answers
99
views
add_action hook is not working on user_register in wordpress
I have a wordpress site, and my registration url is Registration URL.
I have registered a hook to modify user_login after registration if username is more than 10 digits.
if user given mobile number ...
1
vote
1
answer
100
views
c++, How to display an error if user inputs more than one char
I have been trying to find a solution for my school project. The program should display an invalid error if the user enters "Y Y". Currently the program still accepts it and moves on to the ...
- 13
0
votes
1
answer
138
views
Why +1 in realloc for string in C? If it's for null terminator, then how does strlen() measures len of the str if there's no null byte at the end? [duplicate]
This code is from a problem in HackerRank (Q: Printing Tokens in C).
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main() {
char *s = malloc(1024 * sizeof(char))...
- 15
0
votes
1
answer
71
views
Casting from int array to char pointer in C
int v_1[10] = { -1,1000,2 };
int a;
a = strlen(((char*)v_1 + 1));
I'm having trouble understanding why the 'a' variable is equal to 5 in this particular case.
I'm also struggling to grasp the ...
- 13
-1
votes
2
answers
166
views
Why is "-1 < strlen(s)" equal to 0?
char* s =(char*) "sss";
int j = -1;
printf("%d", j < strlen(s));
It's mainly about the difference between j < 3 and j < strlen(s).
In the above code, the printf() ...
- 19
0
votes
0
answers
54
views
Why is the string length of buf1[12] = "hello world?" 13? [duplicate]
I have the code and output below, why are the string length of buf1 and buf2/buf3 different?
#include <stdio.h>
#include <string.h>
int main() {
char buf1[12] = "hello world?&...
- 11
0
votes
2
answers
48
views
String concatenation not working properly in C using sizeof() but it works for strlen() [duplicate]
#include <stdio.h>
int main(void) {
char strp[] = "hello";
char strq[] = " world";
strcat(strp,strq);
puts(strp); //hello world
printf("%d",...
