Finish the readPeople function and freePeople function in a C program given a file handle and an array of null pointers

readPeople.c pasted below...

/********************************************************************************** * readPeople.c - Reads people (max 100), fills in array * * NOTES: * - Input is: * last * first * age * , no blank lines. * - Assume that input is valid (if you find a last name, then there are 2 more lines) * - Input is terminated w/a blank line or EOF * ********************************************************************************/

#include #include

#define CAP 100

typedef struct { char first[10] ; char last[20] ; int age ; } person ;

// reads people from file handle f, format described above // a must be large enough to hold all entries void readPeople( person* a[], FILE* f ) ;

// Returns heap memory pointed to by elements of a // a is of size n // Elements point to a person, or are NULL void freePeople( person* a[], size_t n ) ;

int main( int argc, char **argv ) { FILE *fin = stdin ;

person* team[CAP] = { NULL } ; /* rest are initialised to 0 */

if( argc>1 ) { fin = fopen( argv[1], "r" ) ; if( fin == NULL ) { fprintf( stderr, "Couldn't open %s for reading. Exiting. ", argv[1] ) ; exit( 1 ) ; } }

readPeople( team, fin ) ;

freePeople( team, CAP ) ;

return 0 ; }

void readPeople( person* a[], FILE* f ) { char *buff = NULL ; size_t len ; size_t cnt = 0 ;

while( getline( &buff, &len, f ) > 1 ) { // We read a last name (with the newline) // - get memory for person // - append to array // - read next 2 lines, fill it in

++cnt ; }

free( buff ) ; }

void freePeople( person* a[], size_t n ) { // Do NOT assume array is dense. Check every element }

2. Copy the file readPeople.c. The main function should be in fine shape. You need to finish the function readPeople, and supply the freePeople function. readPeople Given a file handle and an array of null pointers: . Read the information (last name, first name, age ) for a single person Store that information in a person instance allocated from the heap. o Append that instance to the array argument o Attempt to read another person Here is a sample input file: Smith Granny 68 Tape Scott 32 Wire Barbara 45 You may assume: Entries are complete. If there's a last name, then there's a first name and an age Data is correct. Age will always convert to an integer Q2 Place the readPeople function in your labsheet, with formatting. Consider Vim's :r (read) command, or use Bash redirect/append. freePeople This function simply returns the heap instances pointed to by the array to the heap. Do not assume that the array is dense. Check every position for a non-NULL pointer. Q3 Place the freePeople function in your labsheet, with formatting. Consider Vim's :r (read) command, or use Bash redirect/append