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#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define BUFFER_SIZE 1024
typedef struct count_results
{
unsigned long long n_chars;
unsigned long long n_words;
unsigned long long n_lines;
} count_results_t;
char buf[BUFFER_SIZE];
void print_counts(count_results_t *results, char *name)
{
if (name)
{
printf("%10llu %10llu %10llu %10s\n", results->n_lines,
results->n_words, results->n_chars, name);
}
else
{
printf("%10llu %10llu %10llu\n", results->n_lines, results->n_words,
results->n_chars);
}
}
void count(int fd, char *name, count_results_t *results)
{
size_t bytes_read;
unsigned int in_word, i;
in_word = 0;
while ((bytes_read = read(fd, buf, BUFFER_SIZE)) > 0)
{
for (i = 0; i < bytes_read; ++i)
{
if (isspace(buf[i]))
{
if (in_word)
{
results->n_words++;
in_word = 0;
}
}
else
{
in_word = 1;
}
if (buf[i] == '\n')
{
results->n_lines++;
}
}
results->n_chars += bytes_read;
}
print_counts(results, name);
}
int main(int argc, char **argv)
{
int f, fd;
count_results_t total_counts = {.n_chars = 0, .n_words = 0, .n_lines = 0};
count_results_t local_counts = {.n_chars = 0, .n_words = 0, .n_lines = 0};
if (argc == 1)
{
/* Reading from standard input. */
count(0, 0, &total_counts);
}
else
{
/* Reading files, not standard input. */
for (f = 1; f < argc; ++f)
{
fd = open(argv[f], O_RDONLY, 0);
if (fd < 0)
{
/* Error opening file. */
fprintf(stderr, "wc: %s: open: %s\n", argv[f], strerror(errno));
}
else
{
/* Opened the file. */
count(fd, argv[f], &local_counts);
total_counts.n_chars += local_counts.n_chars;
total_counts.n_words += local_counts.n_words;
total_counts.n_lines += local_counts.n_lines;
/* Reset the local counts. */
local_counts.n_chars = local_counts.n_words =
local_counts.n_lines = 0;
close(fd);
}
}
if (argc > 2)
{
/* They provided multiple files. We should print the total too. */
print_counts(&total_counts, "total");
}
}
return 0;
}
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