Andrew, thank you so much for your beautiful explanation. I understand the issue and can confirm that this works exactly as expected:
Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define SIZE 4
int main(void)
{
int mem = SIZE;
char *str = malloc(mem); // let's keep str pointing to beginning of string...
char *next_read = str; // ...and next_read pointing to where next character should go
fgets(next_read, mem, stdin);
printf("str is now %s\n", str);
while(str[strlen(str)-1] != '\n') // if we got whole string, the last char will be '\n'
{
mem += SIZE;
str = realloc(str, mem);
next_read = str + strlen(str);
fgets(next_read, SIZE+1, stdin); // read the rest (hopefully) of the line into the new space
printf("str is now %s\n", str);
}
printf("final str is %s", str);
// free(str);
return 0;
}
Code:
bruno@thinkpad:~/Desktop444$ gcc getstring.c
bruno@thinkpad:~/Desktop445$ ./a.out
I love linux and the C programming language
str is now I l
str is now I love
str is now I love linu
str is now I love linux an
str is now I love linux and th
str is now I love linux and the C
str is now I love linux and the C prog
str is now I love linux and the C programm
str is now I love linux and the C programming
str is now I love linux and the C programming lang
str is now I love linux and the C programming language
str is now I love linux and the C programming language
final str is I love linux and the C programming language
It is strange that realloc() reallocates in situ at first, then not. Knowing that there are no guarantees was the key to the mystery. THANK YOU
Work problem:
Need to set up a job to periodically check that the number of entries in the mail queue.
I'm able to do the following: mailq | grep "Mail Queue"
Which returns: Mail Queue (7 requests)
Unfortunately I'm not sure how I select between `(` and `requests`?
... (2 Replies)
Hi guys, I hope you can help me with my problem.
I have a text file that contains lines like this:
78 ANGELO -809.05
79 ANGELO2 -5,000.06
I need to find all occurences of amounts that are negative and replace them with x's
78 ANGELO xxxxxxx
79... (4 Replies)
Hello All,
Plz help me with:
I have a csv file with data separated by ',' and optionally enclosed by "". I want to check each of these values to see if they exceed the specified string length, and if they do I want to cut just that value to the max length allowed and keep the csv format as it... (9 Replies)
hi,
im quite new to perl regexp. i have a problem where i want to extract a word from a given string. but the word is unknown, only fact is that it appears as the second word in the string.
Eg.
input string(s) :
char var1 = 'A';
int var2 = 10;
char *ptr;
and what i want to do is... (3 Replies)
Dear friends, Please help me to resolve the problem below,
I have a file with following content:
date of file creation : 12 feb 2007
====================
= name : suresh
= city :mumbai
#this is a blank line
= date : 1st Nov 2005
====================
few lines of some text
this... (7 Replies)
HI
In my script, i am reading the input from the user and want to find the length of the string.
The input may contain leading spaces. Right now, when leading spaces are there, they are not counted.
Kindly help me
My script is like below. I am using the ksh.
#!/usr/bin/ksh
echo... (2 Replies)
I have a string:
hgLogOutput=" +0000 files: forum/web/hook-test.txt /forum/web/hook-test-2.txt description: test"
and I want to extract the file names from it, they will always appear between the files: and the description:. I have worked out that I can do this:
"$hgLogOutput" | awk '{... (2 Replies)
I’m looking for an elegant way to convert a delimited file (comma delimited in this case) to padded columns (for printing in non-proportional font) but the length of each column is not known ahead of time. It needs to be calculated for each column from the longest entry in that column in a given... (3 Replies)
Hi
I have a file which contains wrong XML, There are some garbage characters at the end of line that I want to get rid of. Example:
<request type="product" ><attributes><pair><name>q</name><value><!]></value></pair><pair><name>start</name><value>1</value></pair></attributes></request>�J ... (7 Replies)
Discussion started by: dirtyd0ggy
7 Replies
LEARN ABOUT PHP
strlen
STRLEN(3) 1 STRLEN(3)strlen - Get string lengthSYNOPSIS
int strlen (string $string)
DESCRIPTION
Returns the length of the given $string.
PARAMETERS
o $string
- The string being measured for length.
RETURN VALUES
The length of the $string on success, and 0 if the $string is empty.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.3.0 | |
| | |
| | Prior versions treated arrays as the string |
| | Array, thus returning a string length of 5 and |
| | emitting an E_NOTICE level error. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
A strlen(3) example
<?php
$str = 'abcdef';
echo strlen($str); // 6
$str = ' ab cd ';
echo strlen($str); // 7
?>
NOTES
Note
strlen(3) returns the number of bytes rather than the number of characters in a string.
Note
strlen(3) returns NULL when executed on arrays, and an E_WARNING level error is emitted.
SEE ALSO count(3), grapheme_strlen(3), iconv_strlen(3), mb_strlen(3).
PHP Documentation Group STRLEN(3)
11-11-2019
