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Guest
PostPosted: Fri May 21, 2004 8:06 am     Reply with quote
stdlibm.h belongs release 3.177.
Where's the wrong?
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Fri May 21, 2004 12:02 pm     Reply with quote
This discussion is going on way too long, so let's see if we can bring it to an end.

You are asking us to test your example code, is this because you don't have test equipment like an in-circuit debugger (ICD) ?
These kind of devices make your life so much easier because you can set breakpoints and examine variables.

I tried your example code on PCH v3.187 and came up with the following:
1) In my version I had to remove the "#pragma USE DYNAMIC_MEMORY"
2) You can pass a constant string to strcpy() but not to strlen(), doing so will return a 0 length. This is different from standard C and a compiler warning would have been nice here....

The following code works great (no compiler errors and no memory overlaps)

Code:

#include <18F452.H>
// #pragma USE DYNAMIC_MEMORY
#include <stdlibm.h>
#include <string.h>
#ZERO_RAM

unsigned char *stringa1, *stringa2, *stringa3;
int num;


void main()
{
num = 8 + 1;
stringa1 = malloc(num);
strcpy(stringa1, "STRINGA1");

num = 8 + 1;
stringa2 = malloc(num);
strcpy(stringa2, "STRINGA2");

num = 8 + 1;
stringa3 = malloc(num);
strcpy(stringa3, "STRINGA3");

for(;;)
  ; // Loop forever
}
Charlie U



Joined: 09 Sep 2003
Posts: 183
Location: Somewhere under water in the Great Lakes

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PostPosted: Fri May 21, 2004 4:10 pm     Reply with quote
Here's a quick edit of your latest code, still using strlen, but adding a temporary array to hold the string:

Code:

#include <18F452.H>
#pragma USE DYNAMIC_MEMORY
#include <stdlibm.h>
#include <string.h>
#ZERO_RAM

unsigned char *stringa1, *stringa2, *stringa3;
int num;
int string_temp[10] = {0,0,0,0,0,0,0,0,0,0};

void main()
{
   strcpy(string_temp, "STRINGA1");
   num = strlen(string_temp)+1;
   stringa1 = malloc(num);
   strcpy(stringa1, "STRINGA1");

   strcpy(string_temp, "STRINGA2");
   num = strlen(string_temp)+1;
   stringa2 = malloc(num);
   strcpy(stringa2, "STRINGA2");

   strcpy(string_temp, "STRINGA3");
   num = strlen(string_temp)+1;
   stringa3 = malloc(num);
   strcpy(stringa3, "STRINGA3");

   while(1)
   {
   }
   return;
}


I compiled it with 3.190 and simulated it in MPLAB 6.40 and it appears to work fine.
Guest
PostPosted: Mon May 24, 2004 2:52 am     Reply with quote
THANKS A LOT!!!
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