Storing int values in an uint8_t array in code composer studio vs 5.4 - embedded

Question

I have a string in a uint8_t str[] array and I am trying to store the positions of characters within the str in another variable called uint8_t pos[]. The code is written in Code Composer Studio vs 5.4
I tried using sprintf(), type casting as well as changing the type of uint8_t pos[] to int pos[] as well as unsigned int pos[]. None of these work.
The code breaks at the sprintf statement and comes to a halt by reaching an undefined memory location. When I run in assembly after reaching sprintf statement, it gives an error saying that a source code for sprint.c cannot be found in location.
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include "tm4c123gh6pm.h"
#include <stdio.h>
void initHw()
{
.
.
}
int main(void)
{
// Initialize hardware
initHw();
char strRx[80];
int count =0;
int count_enter=0;
uint8_t posStr[80];
uint8_t typeStr[80];
int pos=0;
int len;
unsigned int j=0, argCount=0;
while(1)
{
if(count == 0)
{
putsUart0("Enter characters for the string\r\n");
}
if(count <= 80)
{
char c = getcUart0();
if(c=='\b')
if(count>0)
count--;
else
break;
if(c>=' ')
{
strRx[count]=c;
count++;
}
if(count==80 || c==13)//'\r')
{
count_enter++;
if(count_enter==1) //count==80 before carriage return
{
len = count;
strRx[count]='\0';
while(count!=80)
strRx[count++]='\0';
count_enter=0;
putsUart0("\r\nEntered string is:\r\n");
putsUart0(strRx);
putsUart0("\r\n");
}
j=0;
//char a[10];
for(pos=0; pos!=len; pos++)// strRx[pos]!='\0'; pos++)
{
char a[80];
if((strRx[pos]>='A' && strRx[pos]<='Z') || (strRx[pos]>='a' && strRx[pos]<='z'))
{
typeStr[j]='a';
//posStr[j]=pos;
a[j]=pos;
sprintf(a,"%u",pos); //source not found
//a[j]=pos;
//posStr[j]=sprintf("%c",a);
//posStr[j]=(uint8_t)a;//a;
while(strRx[pos]!='\0'&&((strRx[pos]>='A' && strRx[pos]<='Z') || (strRx[pos]>='a' && strRx[pos]<='z')))
{
pos++;
}
pos--;
j++;
}
else if(strRx[pos]>='0' && strRx[pos]<='9')
{
typeStr[j]='n';
a[j]=pos;
sprintf(a,"%u",pos);
//posStr[j]=pos;//a;
while(strRx[pos]!='\0'&&((strRx[pos]>='0' && strRx[pos]<='9')))
{
pos++;
}
pos--;
j++;
}
else
{
while(strRx[pos]!='\0'&&((strRx[pos]<'A' && strRx[pos]>'Z') && (strRx[pos]<'a' && strRx[pos]>'z') && (strRx[pos+1]<'0' && strRx[pos+1]>'9')))
pos++;
}
}
argCount=j;
while(j!=80)
{
typeStr[j++]='\0';
posStr[j++]='\0';
}
count = 0;
}//if(count==80 || c==13)//'\r')
}//if count<=80
}//while(1)
}//main

Answer 1

The "unable to locate sprintf.c" error probably just means that the debugger cannot locate the source file, which means it cannot show the source code in the debugger window. It's possible that you don't have the source code for sprintf.c and all you have is the precompiled library. Or maybe you do have the source code and the debugger is simply looking in the wrong path. If you have the source code then there may be a way to tell the debugger which path to find it.
But that is just a debugger display issue -- It is not what is causing your program to crash. The problem may be in your code but you'd have to share your code for us to identify that. Or the problem may be a couple other issues that can occur with the printf related routines.
1) printf routines can use a relatively large amount of stack space. So check for a stack overflow and increase the stack size if necessary.
2) Some embedded libraries provide multiple implementations of the printf routines such as "small", "no-float", and "full". The limited implementations use less code space but don't support all of the format specifiers. So make sure the implementation of sprintf that you've linked with supports all the format specifiers that you're actually using. Look through the project settings under linker or libraries for an option to select which version of printf is used.