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HistGen.c
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HistGen.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <sys/time.h>
double wctime()
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec + 1E-6 * tv.tv_usec;
}
// Attempts to open file
FILE *openFile(char *filename)
{
FILE *file;
file = fopen(filename, "r");
if (!file)
{
printf("Error opening file!\n");
return NULL;
}
return file;
}
// Formatted output of statistics
void outputResults(int *charCount)
{
long numLetters = 0;
long totalChars = 0;
for (int i = 32; i < 128; i++)
{
totalChars += charCount[i];
if (i >= 97 && i <= 122)
numLetters += charCount[i];
}
// printf("\n Letter Frequencies\n\n");
// printf(" Char | Count\t [%%] \t\tVisual\n");
// printf("------- | -----------------------------------------------------------\n");
// for (int i = 97; i < 123; i++)
// {
// printf(" %c | %d ", i, charCount[i]);
// printf(" \t\t[%.2f%%] \t", ((double)charCount[i] / numLetters) * 100);
// for (int j = 0; j < charCount[i]; j++)
// printf("∎");
// printf("\n");
// }
printf("----------------------------------------------------------------------\n");
printf("\n\tFile Statistics\n\n");
printf(" Char Type | Count\t [%%]\n");
printf("---------- | ---------------------\n");
printf(" Letters | %li", numLetters);
printf(" \t[%.2f%%]\n", ((double)numLetters / totalChars) * 100);
printf(" Other | %li", totalChars - numLetters);
printf(" \t[%.2f%%]\n", ((double)(totalChars - numLetters) / totalChars) * 100);
printf(" Total | %li\n\n", totalChars);
}
/*
* Creates a process for each letter of the alphabet
* Opens the file and counts the number of occurrences of a specific letter
* Uses ASCII codes to keep track of the count
*/
double start, end;
int *countLetters(char *filename)
{
int *charCount;
FILE *file;
charCount = mmap(NULL, 128 * sizeof(*charCount), PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
start = wctime();
for (int i = 0; i < 27; i++)
{
int c;
if ((file = openFile(filename)) == NULL)
{
printf("Error opening file in child process %d!\n", getpid());
exit(1);
}
pid_t pid = fork();
if (pid == -1)
{
printf("Error forking process!\n");
exit(1);
}
else if (pid == 0)
{
while ((c = tolower(fgetc(file))) != EOF)
{
if (i == 26 && (c < 97 || c > 122))
charCount[c]++; // Count other char
else if (c == i + 97)
charCount[i + 97] += 1; // Count letters
}
fclose(file);
exit(0);
}
else
rewind(file);
}
for (int i = 0; i < 27; i++)
wait(NULL);
end = wctime();
return charCount;
}
int main(int argc, char *argv[])
{
if (argc != 2)
{
printf("Syntax: %s <filename>\n", argv[0]);
return 1;
}
char *filename = argv[1];
FILE *file;
if ((file = openFile(filename)) == NULL)
return 1;
outputResults(countLetters(filename));
printf("\nRun time: %f secs\n", (end - start));
if (fclose(file) != 0)
{
printf("Error closing file!\n");
return 1;
}
return 0;
}