strlen returning -1 for a valid string

lpcware — Thu, 16 Jun 2016 01:16:49 GMT

Content originally posted in LPCWare by NZSmartie on Mon Nov 26 20:38:34 MST 2012
Hey guys,

recently with my application, I've loaded my companies IAP Bootloader which has shifted my program up about 64KB in the flash.
I've using a LPC1758 and I'm using Red suite 4 (NXP Edition) 512K

The problem I'm having is I have a set of strings in an array, as I iterate through the array, strlen is used on all strings and passed to the UART.
after hitting the 3rd string in the array, strlen returns -1. I'm not sure why it happens. When debugging, the string is displayed in the watch without problems.
I've set up a if statement for the -1, and to print out the string using:

sprintf(UBuf,"Some how got %d from '%s'",i,ptr);

where

i = strlen(ptr);

and ptr is a string from the array.

In my serial console, i see:

Some how got -1 from ' '

Does the string functions fail if the pointers are too high in the memory?
I can't find any useful information regarding this.
When debugging, ptr = 0x318CC; and is 14 chars in length;

I'm using Redlib no-host, and I'm managing my own linker scripts

Cheers
Roman

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strlen returning -1 for a valid string