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
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Determine which char * is the shortest without strlen
I have two different char *, char *string1 which is constant and char *string2 which can change. I retrieve char *string2 from a list.
I want to find the length of the shortest char * to use it in:
strncmp(string1, string2, shortest);.
This will…
ZeppRock
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2 answers
Delete specific rows by imposing a condition
I have a structure consisting of a Names column and a Data column.
I need to delete a series of row by imposing the condition with respect to a specific name.
I used this code in another exercise and it seemed to be fine, but I guess it's not…
Antonio
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Comparing N bytes in string
I want to compare argv[1] and the string "pid", but I want to put restrict how much bytes to be compared. I used strncmp, but there are problem, if I put on third argument 3 it compares more than 3 bytes.
#include
#include…
Itra
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2 answers
Comparing int8_t and char* using strcmp/strncmp
Currently trying to fix code that was left unused for a while.
I have two variables: int8_t foo[size] and const char* const bar.
There is an if that checks if(0 != strcmp((char *)foo, bar))
Currently this is failing even though printf("%s | %s",…
Shox2711
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1 answer
delete rows with character in cell array
I need some basic help. I have a cell array:
TITLE 13122423
NAME Bob
PROVIDER James
and many more rows with text...
234 456 234 345
324 346 234 345
344 454 462 435
and many MANY (>4000) more with only numbers
text
text
and more text…
user6110593
0
votes
1 answer
read lines from file with fgets and compare each line with strncmp in c
i want to read every line from a file which looks something like this:
readEveryLine
{
"Bart [m]" -> "Marge [f]";
"Lisa [f]" -> "Homer [m]";
...
}
i want to use:
fgets() to read the file line by line
strncmp() to compare…
MBD
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1 answer
c find exact word from string starting with "
i am doing an exercise in C for my C programming course. I have to read data from a text file into a linked list and look for matches, then print the result out.
Example of the text…
Cyrus Leung
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1 answer
Compare md5 after tftp transfer
Because I use the tftp command to transfer an important file, I would like to compare md5 in order to valid the transfer.
Note : The file has been already transfered in the the example below
int main(int argc, char *argv[])
{
FILE…
ogs
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2 answers
Am I using strncmp and fgets in the right way?
I'm a beginner programmer trying to learn C. Currently I'm taking a class and had a project assigned which I managed to finish pretty quickly, at least the main part of it. I had some trouble coding around the main() if functions though, because I…
Oscar Rodriguez
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Obtain lines of a file beginning with a prefix
I am trying to detect which lines of my plaintext start with "linePrefix". Using the code above, even when there is a coincidence, strcmp never returns 0. Does anyone know where am I failing?
const char PREFIX[] = {"linePrefix"};
FILE *fp;
…
qwerty
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1 answer
What will happen we pass -1 as value for 3rd parameter in strncmp() ie. n number bytes of bytes to compare?
I have three questions,
What will happen we pass -1 as value for 3rd parameter in strncmp() ie. n number bytes of bytes to compare?
Why the output differs in ARM and PPC? ie. if which one correct?
If I use memcmp instead of strncmp, I m getting…
Harini
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1 answer
request for member in something not a structure or union, but it's a struct
this code is a binary search tree I'm doing for my school assignment.
#include "binary_tree.h"
#include
#include
#include
#define MAXLEN 10
Node* create_tree() {
return NULL;
}
void insert_tree(Node** root, char*…
JinMin Lee
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0
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2 answers
Is there an idiomatic use of strncmp()?
The strncmp() function really only has one use case (for lexicographical ordering):
One of the strings has a known length,† the other string is known to be NUL terminated. (As a bonus, the string with known length need not be NUL terminated at…
jxh
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strncmp in two statements takes more time than in single statement
For doing a file sorting in my code i used strncmp for the comparison of first elements of each string.
Including my code here :
Code 1:
for (i = 1; i < file_cnt; )
{
if ((strncmp(info[i-1].name, "1", 1) == 0) &&
(strncmp(info[i].name, "2",…
user-ag
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0
votes
2 answers
strcpy / strncmp segmentation fault in struct fileds
I'm trying to add a new node to a struct with a char* field (word)
Definition of listT:
enum boolean {false, true};
struct list {
enum boolean sorted;
union{
int words;
char *word;
};
struct list* next;
struct…
user3163175
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