RE:

[Patrick Townsend <townsend@xxxxxxxxxxxxxx>]

I think Jevgeni covered most of this, but the answer is yes, you have to 
convert the non-null terminated string from the DS into a null terminated 
string. And, yes, you will probably want to write a little C routine to 
find the last blank in the string array and convert it to a null. I 
normally use memcpy() to move the DS array into a null terminated string:

    memset(MyLongString, 0, sizeof(MyLongString));
    memcpy(MyLongString, MyDSString, sizeof(MyDSString));
    null_term(MyLongString, sizeof(MyLongString))    /* a function I wrote */

Patrick


At 03:15 AM 6/21/2000 -0400, Pantzopoulos, Mike wrote:

>Thanks Patrick. Now for the tricky one. I have an external DS which has 
>fields defined in it such as CHAR MSGDTp [40] (The field is actually named 
>MSGDT# however the interface converts the # to p to establish a correct C 
>syntax named field). If I want to append some other string via strcpy then 
>both fields have to be a string (according to the manual). Does this mean 
>that I have to convert my external DS field into a string (via a locally 
>define variable, of the same size as the MSGTp field plus 1 )?by appending 
>a null character? And if so how do I do that? Do I have to get complicated 
>by finding the first blank in MSGDT ( or the first non-blank from right to 
>left, plus 1  )and then placing the null (0x00) value into that character 
>position to turn it into a string?
>-----Original Message-----  From:   Patrick Townsend 
>[<mailto:townsend@patownsend.com>mailto:townsend@patownsend.com]  Sent: 
>Wednesday, 21 June 2000 14:38  To:     C400-L@midrange.com; 
>'C400-L@midrange.com'  Subject:        Re:  Mike,
>
>char   mychar;        /* this defines a single character, not a string 
>*/  char   mystring[6];   /* this defines a string of 6 bytes. it 
>contains  garbage */                         /* until you initialize it */
>
>How to compare a character (note the use of single quote):
>
>        if (mychar == '1')           foo();
>
>How to compare a string (note the use of double quote):
>
>        if (!strcmp(mystring, "hello"))           foo();
>
>There are other string comparisons. strncmp() compares strings for a 
>given  number of bytes. stricmp() ignores case on the compare, etc.
>
>If you want to check the value of a single character in a string you can do:
>
>        if (mystring[4] == '1')            foo();
>
>This checks the fifth position in the string for the character value of '1'.
>
>Strings are not null terminated until you make them so. Some C 
>functions  will automatically terminate a string with a null. Some examples:
>
>      memset(mystring, 0, sizeof(mystring));    /* sets the entire string 
> to  nulls */       strcpy(mystring, "hello");                /* creates a 
> null terminated  string */
>
>Patrick
>
>At 09:03 PM 6/20/2000 -0400, Pantzopoulos, Mike wrote:
>
> >I'm a bit confused about how to deal with a single character. Is a 
> char  >x[1]; or char x; statement defining a string or a 
> character?  >  >Ishould it be compared via a ............if(x== 
> '1')  statement or should  >a strcmp function be invoked? I presume that 
> any definition such as char  >x[6] defines a string (as null terminated). 
> So is char x[1] defining a  >null terminated string of length 2 
> (inclusive of the null character)?  >
>
>---  IBM AS/400 communications, FTP automation, and network 
>security  software and consulting services.
>
><http://www.patownsend.com>http://www.patownsend.com
>
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---
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