Count Query Parameters

Task

Implement the function count_parameters.

• Write a function that counts the number of query parameters in a URL path
• Query parameters are in the format key=value and are separated by &
• The query string starts after the ? character
• Return the count of parameters

Function Signature

// Count the number of query parameters in a URL path
// Returns the count (0 if no parameters)
int count_parameters(char* path);

Note

• If there’s no ? in the path, there are 0 parameters
• Count the number of = signs after the ? to determine parameter count
• Alternatively, count & signs and add 1 (if there’s at least one parameter)
• You don’t need to validate the format of the parameters
• Don’t modify the input string

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Example

Input	Output
/post?user=joe&message=hi	2
/react?user=aaron&message=👍&id=5	3
/chats	0
/post?user=alice	1
/test?a=1&b=2&c=3&d=4	4

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Code

#include <stddef.h>
#include <stdio.h>
#include <string.h>
 
int count_parameters(char *path)
{
    int count = 0;
    char* start = strstr(path, "?");
    while(start != NULL){
        start = strstr(start + 1, "=");
        if(start != NULL){count++;}
    }
    return count;
}