Best way to axe N bytes from the right? Post: 302912512

Sponsored Content

Top Forums Programming Best way to axe N bytes from the right? Post 302912512 by Gary Kline on Friday 8th of August 2014 05:19:10 PM

08-08-2014

Registered User

Quote:

Originally Posted by Don Cragun

Is this a homework assignment?

There are a lot of inconsistencies in the statements in your last post and you didn't answer most of my questions. Let me try once more:

What is the function prototype for your function?
What do you want your function to return (an integer or a string)? Your example said it should return "78" (which is a string), but you said you could use atoi() which returns an int???
If you want your function to return one value, why are you passing it more than one string?
What errors do you want to detect?
How do you want to report errors? (Special return values, changing errno, diagnostics printed to stderr, ...)
Have you read the man page for atoi()? If you have, why is the ".text" a concern?

the reason i didn't answer the questions last time is that it turns out that there were no [or few] errors to be checked for.

the prototype might be something like:

Code:

int returnInt(char *)

which would be called in a loop when the program has determined how many "xyz.NN.text" files there were. the "text" files are in each users ~/share/voice/" directory. each text file contains text of some kind. this text can be from one word such as "Hello" to possibly 50 words. (I have not tested the limit of the GTK+ 3.0 "label" widget.

the function should return the intereger vale of whatever string vale i can extract. foo.9.text would be stripped to the string "9" and one final line could easily return and int 9.

[!!] i just discovered that

Code:

 nptr = "89.text";

returns int 89. nothing in the man atoi page indicated that.

Nevertheless, if there is a way of [[easily]] stripping of the "text" i would be much obliged for some example code. ---or maybe find the src for atoi. Anyway, thanks for the clue.

PS: Homework!? I was part of the crew who turned v6 UNIX to v7 UNIX. I'm rusty but still at it ... .

Gary Kline

View Public Profile for Gary Kline

Find all posts by Gary Kline

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Remove first N bytes and last N bytes from a binary file on AIX.

Hi all, Does anybody know or guide me on how to remove the first N bytes and the last N bytes from a binary file? Is there any AWK or SED or any command that I can use to achieve this? Your help is greatly appreciated!! Best Regards, Naveen.

2. Shell Programming and Scripting

80 bytes per line ???

I am creating ASCII file from Oracle procedure into Unix box. I undertstand there is NO CRLF as I am writing it into one complete string .. but need to know what is best way to format the file with 80bytes per line only before handing over to another program. Thanks in advance regards...

3. UNIX for Dummies Questions & Answers

Files with zero bytes

Hi All, I want to find zero byte files in the given folder for the given day. I know we can use find . -size 0 -mtime 0 But is there an option for file creation.? ls -lart | grep ' 0 Apr 24' will also work. Also is there any alternative using awk ? I want to know how to use awk in...

4. Shell Programming and Scripting

Printing bytes

Hi, I have packed fields for which I am trying to print bytes. when I try cut -b2 it does print the 2nd byte besides that it also prints additional byte that I am not aware off:confused: data looks something like this Input: 135 246 when I try cut -b2 it gives me 30 4A but I...

5. Shell Programming and Scripting

Error PHP Fatal error: Allowed memory size of 67108864 bytes exhausted(tried to allocate 401 bytes)

While running script I am getting an error like Few lines in data are not being processed. After googling it I came to know that adding such line would give some memory to it ini_set("memory_limit","64M"); my input file size is 1 GB. Is that memory limit is based on RAM we have on...

6. Programming

Copying 1024 bytes data in 3-bytes chunk

Hi, If I want to copy a 1024 byte data stream in to the target location in 3-bytes chunk, I guess I can use the following script. dd bs=1024 count=3 if=/src of=/dest But, I would like to know, how to do it via a C program. I have tried this with memcpy(), that did not help.

7. UNIX for Dummies Questions & Answers

X bytes of 0, Y bytes of random data, Z bytes of 5, T bytes of 1. ??

Hello guys. I really hope someone will help me with this one.. So, I have to write this script who: - creates a file home/student/vmdisk of 10 mb - formats that file to ext3 - mounts that partition to /mnt/partition - creates a file /mnt/partition/data. In this file, there will...

8. Shell Programming and Scripting

Shell script - entered input(1-40 bytes) needs to be converted exactly 40 bytes

hello, suppose, entered input is of 1-40 bytes, i need it to be converted to 40 bytes exactly. example: if i have entered my name anywhere between 1-40 i want it to be stored with 40 bytes exactly. enter your name: donald duck (this is of 11 bytes) expected is as below - display 11...

9. Shell Programming and Scripting

Get file's first x bytes

is there a better way to do this: head -c 10000k /var/dump.log | head -c 6000k unfortunately, the "-c" option is not available on sun solaris. so i'm looking at "dd". but i dont know how to use it to achieve the same exact goal as the above head command. this needs to work on both solaris...

10. What is on Your Mind?

Definition of Bytes

A byte is the smallest unit of storage which can be accessed in a computer's memory- either in RAM or ROM.It also holds exactly 8 bits.But its old view one byte was sufficient to hold one 8 bit character.Modern days especially on .NET or international versions of Win 32, 16 bits is needed. ...

LEARN ABOUT MINIX

atoi

ATOI(3)                                                      Linux Programmer's Manual                                                     ATOI(3)

NAME

       atoi, atol, atoll - convert a string to an integer

SYNOPSIS

       #include <stdlib.h>

       int atoi(const char *nptr);
       long atol(const char *nptr);
       long long atoll(const char *nptr);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       atoll():
           __ISOC99_SOURCE ||
               || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

       The atoi() function converts the initial portion of the string pointed to by nptr to int.  The behavior is the same as

           strtol(nptr, NULL, 10);

       except that atoi() does not detect errors.

       The atol() and atoll() functions behave the same as atoi(), except that they convert the initial portion of the string to their return type
       of long or long long.

RETURN VALUE

       The converted value.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +------------------------+---------------+----------------+
       |Interface               | Attribute     | Value          |
       +------------------------+---------------+----------------+
       |atoi(), atol(), atoll() | Thread safety | MT-Safe locale |
       +------------------------+---------------+----------------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, C99, SVr4, 4.3BSD.  C89 and POSIX.1-1996 include the functions atoi() and atol() only.

NOTES

       Linux libc provided atoq() as an obsolete name for atoll(); atoq() is not provided by glibc.

SEE ALSO

       atof(3), strtod(3), strtol(3), strtoul(3)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU                                                                 2016-03-15                                                             ATOI(3)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Remove first N bytes and last N bytes from a binary file on AIX.

Discussion started by: naveendronavall

2. Shell Programming and Scripting

80 bytes per line ???

Discussion started by: u263066

3. UNIX for Dummies Questions & Answers

Files with zero bytes

Discussion started by: preethgideon

4. Shell Programming and Scripting

Printing bytes

Discussion started by: ahmedwaseem2000