cs50.c

/****************************************************************************
 * CS50 Library 3.0
 *
 * https://manual.cs50.net/Library
 *
 * Glenn Holloway <holloway@eecs.harvard.edu>
 * David J. Malan <malan@harvard.edu>
 *
 * Based on Eric Roberts' genlib.c and simpio.c.
 *
 * Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
 * http://creativecommons.org/licenses/by-nc-sa/3.0/
 ***************************************************************************/

#include "cs50.h"

/*
 * Reads a line of text from standard input and returns the equivalent
 * char; if text does not represent a char, user is prompted to retry.
 * Leading and trailing whitespace is ignored.  If line can't be read,
 * returns CHAR_MAX.
 */

char
GetChar(void)
{
    // try to get a char from user
    while (true)
    {
        // get line of text, returning CHAR_MAX on failure
        string line = GetString();
        if (line == NULL)
            return CHAR_MAX;

        // return a char if only a char (possibly with
        // leading and/or trailing whitespace) was provided
        char c1, c2;
        if (sscanf(line, " %c %c", &c1, &c2) == 1)
        {
            free(line);
            return c1;
        }
        else
        {
            free(line);
            printf("Retry: ");
        }
    }
}


/*
 * Reads a line of text from standard input and returns the equivalent
 * double as precisely as possible; if text does not represent a
 * double, user is prompted to retry.  Leading and trailing whitespace
 * is ignored.  For simplicity, overflow and underflow are not detected.
 * If line can't be read, returns DBL_MAX.
 */

double
GetDouble(void)
{
    // try to get a double from user
    while (true)
    {
        // get line of text, returning DBL_MAX on failure
        string line = GetString();
        if (line == NULL)
            return DBL_MAX;

        // return a double if only a double (possibly with
        // leading and/or trailing whitespace) was provided
        double d; char c;
        if (sscanf(line, " %lf %c", &d, &c) == 1)
        {
            free(line);
            return d;
        }
        else
        {
            free(line);
            printf("Retry: ");
        }
    }
}


/*
 * Reads a line of text from standard input and returns the equivalent
 * float as precisely as possible; if text does not represent a float,
 * user is prompted to retry.  Leading and trailing whitespace is ignored.
 * For simplicity, overflow and underflow are not detected.  If line can't
 * be read, returns FLT_MAX.
 */

float
GetFloat(void)
{
    // try to get a float from user
    while (true)
    {
        // get line of text, returning FLT_MAX on failure
        string line = GetString();
        if (line == NULL)
            return FLT_MAX;

        // return a float if only a float (possibly with
        // leading and/or trailing whitespace) was provided
        char c; float f;
        if (sscanf(line, " %f %c", &f, &c) == 1)
        {
            free(line);
            return f;
        }
        else
        {
            free(line);
            printf("Retry: ");
        }
    }
}


/*
 * Reads a line of text from standard input and returns it as an
 * int in the range of [-2^31 + 1, 2^31 - 2], if possible; if text
 * does not represent such an int, user is prompted to retry.  Leading
 * and trailing whitespace is ignored.  For simplicity, overflow is not
 * detected.  If line can't be read, returns INT_MAX.
 */

int
GetInt(void)
{
    // try to get an int from user
    while (true)
    {
        // get line of text, returning INT_MAX on failure
        string line = GetString();
        if (line == NULL)
            return INT_MAX;

        // return an int if only an int (possibly with
        // leading and/or trailing whitespace) was provided
        int n; char c;
        if (sscanf(line, " %d %c", &n, &c) == 1)
        {
            free(line);
            return n;
        }
        else
        {
            free(line);
            printf("Retry: ");
        }
    }
}


/*
 * Reads a line of text from standard input and returns it as a
 * string (char *), sans trailing newline character.  (Ergo, if
 * user inputs only "\n", returns "" not NULL.)  Returns NULL
 * upon error or no input whatsoever (i.e., just EOF).  Leading
 * and trailing whitespace is not ignored.  Stores string on heap
 * (via malloc); memory must be freed by caller to avoid leak.
 */

string
GetString(void)
{
    // growable buffer for chars
    string buffer = NULL;

    // capacity of buffer
    unsigned int capacity = 0;

    // number of chars actually in buffer
    unsigned int n = 0;

    // character read or EOF
    int c; 
	int space = 0;

    // iteratively get chars from standard input
    while ((c = fgetc(stdin)) != '\n' && c != EOF)
    {
        if (c != '.' && c != '?' && c != '!' && !isalnum(c))
			space++;
		else
			space = 0;
		
		// grow buffer if necessary
        if (n + 1 > capacity)
        {
            // determine new capacity: start at 32 then double
            if (capacity == 0)
                capacity = 32;
            else if (capacity <= (UINT_MAX / 2))
                capacity *= 2;
            else
            {
                free(buffer);
                return NULL;
            }

            // extend buffer's capacity
            string temp = realloc(buffer, capacity * sizeof(char));
            if (temp == NULL)
            {
                free(buffer);
                return NULL;
            }
            buffer = temp;
        }

        // append current character to buffer
        buffer[n++] = c;
    }

	if (space > 0)
	{
		n = n - space;
		buffer[n + 1] = '\0';
	}
	
    // return NULL if user provided no input
    if (n == 0 && c == EOF)
        return NULL;

    // minimize buffer
    string minimal = malloc((n + 1) * sizeof(char));
    strncpy(minimal, buffer, n);
    free(buffer);

    // terminate string
    minimal[n] = '\0';

    // return string
    return minimal;
}


string
GetFileName(void)
{
    // growable buffer for chars
    string buffer = NULL;

    // capacity of buffer
    unsigned int capacity = 0;

    // number of chars actually in buffer
    unsigned int n = 0;

    // character read or EOF
    int c; 
	int space = 0;

    // iteratively get chars from standard input
    while ((c = fgetc(stdin)) != '\n' && c != EOF)
    {
        if (c == ' ')
			space++;
		else
			space = 0;
		
		// grow buffer if necessary
        if (n + 1 > capacity)
        {
            // determine new capacity: start at 32 then double
            if (capacity == 0)
                capacity = 32;
            else if (capacity <= (UINT_MAX / 2))
                capacity *= 2;
            else
            {
                free(buffer);
                return NULL;
            }

            // extend buffer's capacity
            string temp = realloc(buffer, capacity * sizeof(char));
            if (temp == NULL)
            {
                free(buffer);
                return NULL;
            }
            buffer = temp;
        }

        // append current character to buffer
        buffer[n++] = c;
    }

	if (space > 0)
	{
		n = n - space;
		buffer[n + 1] = '\0';
	}
	else
		buffer[n] = '\0';
	
	char txt[] = ".cco";
	
	strcat(buffer, txt);

	n += 4;
	
	
    // return NULL if user provided no input
    if (n == 0 && c == EOF)
        return NULL;

    // minimize buffer
    string minimal = malloc((n + 1) * sizeof(char));
    strncpy(minimal, buffer, n);
    free(buffer);

    // terminate string
    minimal[n] = '\0';

    // return string
    return minimal;
}


string
GetInput(void)
{
	string inp = GetString();
	
	int length = strlen(inp);
	
	for (int n = 0; !isalpha(*inp) && *inp != '/' && n < length; inp = inp + 1, n++);

	return inp;
}