The strncmp function is a string comparison function found in languages like C and C++. In contrast with strcmp, the strncmp function takes a third argument denoting the maximum length of the strings. This is used to prevent out of bounds errors.
Questions tagged [strncmp]
85 questions
0
votes
3 answers
Strncmp: Unusual segmentation Fault
I'm really new to C, but I've been writing C++ for a while. I'm writing a client sever chat program. I need to prompt the user with a couple of different options at the beginning of the session, after they've entered a username. At first I was…
James Erickson
- 25
- 5
0
votes
2 answers
Use of strcmp() to read data from a client not working as expected
I am following an exercise where I need to set up networking between a client and server and have them "talk". I need to check for specific responses from the client and then have the server act accordingly. To read data from the client, I am using…
user1720897
- 1,216
- 3
- 12
- 27
0
votes
1 answer
For the life of me, I can't compare the first character of this array
All I want to do is pass in a char* buffer and compare that to a literal string "@" -- why is this so difficult for me.
char* buffer = "@3702";
string b(buffer);
string c("@");
if (strncmp(b.c_str(), c.c_str(), 1) == 0)
{
…
MrDuk
- 16,578
- 18
- 74
- 133
0
votes
3 answers
Can someone explain why this function is the way it is?
I was looking at functions from GNU C library, glibc-2.18, and this is the code I found for strncmp.c
Looking at it I don't understand why it's written this way. Is this loop unrolling? Why not use 5 or 10 instead of 4? And why did they write like…
2013Asker
- 2,008
- 3
- 25
- 36
0
votes
3 answers
comparing strings c++ with wildcard values
I've been lurking around here for a long time, thank you for all your help in the past, even if this is the first question I've had to ask.
I'm trying to make a simple database program, and I am stuck the search requirement for it.
When searching,…
user3064777
- 1
- 1
0
votes
2 answers
How to compare user input string with string in a file in C
So Im trying to make a program that searches in a file for a word that the user inputs. If theres a match, it say "FOUND IT", if it couldnt find anything, it says " COULDNT FIND ANYTHING" (obviously :p). Im not clear at how to scan the file for the…
raz
- 75
- 2
- 12
0
votes
4 answers
strncmp() gives a false positive
I have been expirencing an issue with strncmp and getline... so a i made a little test app. strncmp gives false positives and i can't figure out what i am doing wrong.
this is the program
#include
FILE *fp=NULL;
char uname[4]="test";
char…
MrBlarg64
- 13
- 1
- 2
0
votes
2 answers
strncmp in Linked List
This program should allow the user to input some names (until the user wishes to continue.) and then display those names in ascending order. I have used the strncmp function in comparing the char arrays. But when this is run, only the 1st and last…
Dee
- 3
- 4
0
votes
2 answers
Long spacing after loading buffer from text file
Okay, this is just part of a simple client-server program. Right now I'm just trying to implement a simple login checker.
Inside the Users.txt file is just one line: "Bryan". So far I cannot get strncmp to produce a positive response.
#include…
gwar666
- 13
- 1
- 4
0
votes
1 answer
Why is strncmp not comparing? Socket programing C
I'm trying to parse the received data from a client in a server. The server have to send back a message according to what the client sent before. But I can not make the strncmp function compare the strings. It always get to the else and my server…
netfreak
- 63
- 2
- 4
- 9
0
votes
2 answers
using strncmp c-style string function
I have a string and I'm trying to find out if it's a substring in another word.
For instance(pseudocode)
say I have string "pp"
and I want to compare it (using strncmp) to
happy
apples
pizza
and if it finds a match it'll replace the "pp" with…
ShadyBears
- 3,955
- 13
- 44
- 66
0
votes
5 answers
strncmp not matching correctly
I have no idea how to work with strings in C:
here's a part of my server:
The break never gets called, even though I supply the character '/' through telnet.
Ideally, this would buffer up the string called get by adding the string ch to it over and…
stackOverFlew
- 1,479
- 2
- 31
- 58
0
votes
2 answers
C++: Funny string comparison crash
I'm trying to take in a simple command line argument in a C++ program to trigger different program behavior - when you include a "y" (or any string starting with y - I don't really care) the program displays some intermeadiate results.
When I run…
fatman
- 65
- 6
-1
votes
1 answer
Write a program that reads a short string and a longer string and checks if the longer string starts with the letters of the short string. Use strncmp
I need help getting this code to work. Could someone tell me how to properly use strncmp and how to get this to work?
Example: Enter first string: john
Enter second string: johnson
johnson does start with john
This is my code here:
#include…
Aislyn Green
- 11
- 1
-1
votes
1 answer
my strncmp isnt working for two 2d arrays
I am trying to compare and find matches in my two arrays but it is not working can any one help?
const char spam[30][30] = {"cash bonus","earn money","fast cash","free access","free gift","free membership",
"giveaway","million…
sonya
- 1