NUL is the abbreviation for the null character in several character sets
NUL has a value of 0 and is often written as the escape sequence \0. It is used as a terminator in c standard strings.
Questions tagged [nul]
179 questions
3
votes
4 answers
Fill a bash array from a NUL separated input
I want to create a bash array from a NUL separated input (from stdin).
Here's an example:
## Let define this for clarity
$ hd() { hexdump -v -e '/1 "%02X "'; echo ;}
$ echo -en "A B\0C\nD\0E\0" | hd
41 20 42 00 43 0A 44 00 45 00
So this is my…
vaab
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2
votes
1 answer
read() stops after NUL character
I'm downloading files over HTTPS, I request the files through urllib2.Request and they come back as a socket._fileobject. I'd ideally like to stream this to file to avoid loading it into memory but I'm not sure how to do this.
My problem is if I…
GP89
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2
votes
2 answers
show query meta_key_value including null value
I am trying to do a simple query in WordPress ordered by a meta_value_num of a custom field, the problem is that not all the inputs have a value so it gives me a null value and it does not show very well in the query, it only shows the ones that…
Plantas y remedios Caseros
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2
votes
2 answers
Is there a way to deal with embedded nuls while reading in parquet files?
I have data scraped from the internet (hence varied encodings) and stored as parquet files. While processing it in R I use the arrow library. For the following code…
Akash21795
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2
votes
2 answers
Select Mysql with empty value on join
I have the following MySQL tables (create & insert):
CREATE TABLE IF NOT EXISTS `department` (
`id` INT NOT NULL,
`name` VARCHAR(45) NOT NULL,
`father` INT NULL,
PRIMARY KEY (`id`),
INDEX `fk_department_department_idx` (`father` ASC)…
Fábio
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2
votes
1 answer
Why undefined plus undefined equals to Nan in Javascript
How to understand undefined and null much better
console.log(undefined + 5) //NaN
console.log(null + 5) //5
console.log(undefined + undefined) //NaN
I don't know
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2
votes
1 answer
Null-terminated strings created with calloc?
I want to allocate memory for a string using calloc, I know that calloc fills the whole allocated memory with 0, but I also found out that they are different from \0 in some contexts.
This whole discussion it's kind of confusing for a newbie (like…
B.Castarunza
- 135
- 12
2
votes
3 answers
C: Count positive/negative numbers and 0's in array
I'm trying to write a program in C to count the number of positive and negative numbers in an array as well as the number of zeroes.
I have written the following code:
int A[15], pos, neg, nul, i;
[...]
pos = 0;
neg = 0;
nul = 0;
for (i = 0; i <=…
MrStrategschi
- 31
- 4
2
votes
0 answers
NUL Character is getting written to start and end of a file in CSV
I am trying to write some contents of text file to a csv file using spark databricks write package.
However, i am getting NUL character getting added to start and end of each line
Output :…
parthasarathi0317
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- 8
2
votes
2 answers
How to ignore Null values at the end of a string in Oracle?
I have a column nse_credit_rating with datatype VARCHAR2(18).
It contains values of form 189.00-250.00.
But some records have null values at the end of the string i.e even if the data relevant to me is of length 13 (189.00-250.00) but…
arjun gaur
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2
votes
0 answers
Writing NUL characters to csv
I am trying to preserve data integrity while writing to a csv file and am having trouble writing null characters. The following code snippet produces a file with "Hello"
with open('outfile..txt', 'wb') as f:
row = ['Hello\x00World']
writer =…
M. Bloom
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2
votes
3 answers
Using grep to find and delete files that are filled with zeros
I tried recovering a disk image from an NTFS hard drive that is 50% unreadable. And I guess a side effect of that is a lot of the files recovered have the correct filename and type, and take up the same file size as the original file, however…
TheBladeRoden
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- 1
2
votes
1 answer
Relation between calloc char array and null terminating character
This whole "debate" on the web about strncpy being safe vs unsafe is driving me crazy. I find some people saying strncpy is the "devil", which to me sounds like they lack the programming discipline. I get that there is no \0 character added to the…
ThatsRightJack
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2
votes
1 answer
Unable to get frame content, Uncaught DOMException: Blocked a frame with origin "null" from accessing a cross-origin frame
I'm trying to access html document from one of my frames with javascript, but I'm getting a Uncaught DOMException: Blocked a frame with origin "null" from accessing a cross-origin frame. error.
This is the main page:
…
Zbarcea Christian
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2
votes
1 answer
Reading a TSV with specific encoding (initial two bytes and UTF-8 afterwards) and NUL after each character
I have an obscure TSV that I'm trying to read and apparently it starts with a identifier and has some NUL values embedded (it seems that it's one NUL after each genuine character). These are the first 100 bytes of the file (shortened with a hex…
takje
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