Answered: Write a C language function named count…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Write a C language function named count that takes a void pointer and int parameter, representing a memory buffer, and a uint8_t parameter representing a byte, and returns an int result. The returned result should be the number of occurrences of the byte in the bufer. For example if the buffer p pointed to the bytes 01 12 01 23, then count(p, 4, 0x01) should return 2.

Expert Solution

Step 1

Program code:

#include <stdio.h>

#include <stdint.h>

int count(void *buf, int buf_bytes, uint8_t x)

{

// convert the void pointer to the char pointer

char* pChar=(char*)buf;

// Take the count and initialze it to ZERO

int count=0;

// start a loop

for(int i=0;i<buf_bytes;i++)

{

// Check if the value is matched

if(pChar[i]==x)

count++; // increase the count

}

// return the count here to the main function

return count;

}

int main()

{

unsignedchar buffer[] = { 0x01, 0x12, 0x01, 0x23 };

printf("Result = %d\n", count(buffer,4,0x01));

return0;

}

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