Do you know how to make 'ls' command in C without using functions from
standart libraries? I can use only printf, scanf and functions
implemented in man getpwnam and man getgrnam.
Thanx a lot.

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ondrejhavlak@centrum.cz (Ondras) writes:

> Do you know how to make 'ls' command in C without using functions from
> standart libraries? I can use only printf, scanf and functions
> implemented in man getpwnam and man getgrnam.

That's impossible.  You need at least opendir() and readdir() also,
unless you're allowed to use scandir().  Are you sure you read the
assignment properly?

--
Måns Rullgård
mru@kth.se

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Needs to be converted to return char**, but this is what I use.

#include <dirent.h>
#include <regexpr.h>
#include <stdio.h>
#include <stdlib.h>

HashTable* ListDirectory(String& in,char* regx)
{
DIR               *dirp;
struct dirent     *dp;
HashTable*        files;
char              *expbuf=NULL;

if (in.IsEmpty())
{
lERROR("Received null pointer.  Expected char*.");
return NULL;
}
files = new HashTable;
dirp = opendir(in.Get());
if (dirp EQ NULL)
{
lERROR_A("Unable to open directory \"%s\".",in.Get());
return NULL;
}
while ( (dp = readdir( dirp )) != NULL )
{
if (regx EQ NULL) files->Put(dp->d_name,(void*)NULL);
else
if ((expbuf = compile(regx,(char*)0,(char*)0)))
if (step(dp->d_name,expbuf)) files->Put(dp->d_name,(void*)NULL);
free(expbuf);
}
closedir( dirp );
return files;
}
/*
main (void)
{
int             i;
list_directory(".",&i,".*\\.c$");
}
*/


Ondras wrote:
> Do you know how to make 'ls' command in C without using functions from
> standart libraries? I can use only printf, scanf and functions
> implemented in man getpwnam and man getgrnam.
> Thanx a lot.


--
___  _ ____       ___       __  __
/ _ )(_) / /_ __  / _ \___ _/ /_/ /____  ___
/ _  / / / / // / / ___/ _ `/ __/ __/ _ \/ _ \
/____/_/_/_/\_, / /_/   \_,_/\__/\__/\___/_//_/
/___/
Texas Instruments ASIC Circuit Design Methodlogy Group
Dallas, Texas, 214-480-4455,  b-patton@ti.com

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dirp = opendir(in.Get());  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
if (dirp EQ NULL)
{
lERROR_A("Unable to open directory \"%s\".",in.Get());
return NULL;
}
while ( (dp = readdir( dirp )) != NULL ) <<<<<<<<<<<<<<<<<<<<<<<<<<<<

Måns Rullgård wrote:
> ondrejhavlak@centrum.cz (Ondras) writes:
>
> 
>
>
> That's impossible.  You need at least opendir() and readdir() also,
> unless you're allowed to use scandir().  Are you sure you read the
> assignment properly?
>


--
___  _ ____       ___       __  __
/ _ )(_) / /_ __  / _ \___ _/ /_/ /____  ___
/ _  / / / / // / / ___/ _ `/ __/ __/ _ \/ _ \
/____/_/_/_/\_, / /_/   \_,_/\__/\__/\___/_//_/
/___/
Texas Instruments ASIC Circuit Design Methodlogy Group
Dallas, Texas, 214-480-4455,  b-patton@ti.com

[ Post a follow-up to this message ]

Guess I got taken in by a student.  Didn't think this was an assignment
for someone.  I sometimes ask for small functions that someone else has
already done just to keep from writing them.  Spend more time on hte
problem I'm trying to solve that writeing tools to solve them.


Måns Rullgård wrote:
> ondrejhavlak@centrum.cz (Ondras) writes:
>
> 
>
>
> That's impossible.  You need at least opendir() and readdir() also,
> unless you're allowed to use scandir().  Are you sure you read the
> assignment properly?
>


--
___  _ ____       ___       __  __
/ _ )(_) / /_ __  / _ \___ _/ /_/ /____  ___
/ _  / / / / // / / ___/ _ `/ __/ __/ _ \/ _ \
/____/_/_/_/\_, / /_/   \_,_/\__/\__/\___/_//_/
/___/
Texas Instruments ASIC Circuit Design Methodlogy Group
Dallas, Texas, 214-480-4455,  b-patton@ti.com

[ Post a follow-up to this message ]