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Top Forums UNIX for Dummies Questions & Answers checking if parameter passed is a number Post 302335474 by magnia on Sunday 19th of July 2009 02:09:07 PM
Old 07-19-2009
checking if parameter passed is a number

I have written a function that fills an array and another function where if a parameter is supplied it will jump to that part of the array and cat it to the screen.

I need to put in some checks to make sure the parameter supplied is firstly a number and then not a number great than the length of the array. if the user enters no value or anincorrect value it should be ignored and just cats out the entire array.

any ideas?
 

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scandir(3)						     Library Functions Manual							scandir(3)

Name
       scandir - scan a directory

Syntax
       #include <sys/types.h>
       #include <sys/dir.h>

       scandir(dirname, namelist, select, compar)
       char *dirname;
       struct direct *(*namelist[]);
       int (*select)();
       int (*compar)();

       alphasort(d1, d2)
       struct direct **d1, **d2;

Description
       The  subroutine	reads the directory dirname and builds an array of pointers to directory entries using It returns the number of entries in
       the array and a pointer to the array through namelist.

       The select parameter is a pointer to a user supplied subroutine which is called by to select which entries are to be included in the array.
       The  select routine is passed a pointer to a directory entry and should return a non-zero value if the directory entry is to be included in
       the array.  If select is null, then all the directory entries will be included.

       The compar parameter is a pointer to a user supplied subroutine which is passed to to sort the completed array.	If this pointer  is  null,
       the array is not sorted.  The is a routine which can be used for the compar parameter to sort the array alphabetically.

       The  memory  allocated  for  the array can be deallocated with free by freeing each pointer in the array and the array itself.  For further
       information, see

Diagnostics
       Returns -1 if the directory cannot be opened for reading or if cannot allocate enough memory to hold all the data structures.

See Also
       directory(3), malloc(3), qsort(3), dir(5)

																	scandir(3)
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