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#include <stdio.h>
#include <unistd.h>
int wc(FILE* fp)
{
register int c;
int word = 0, num_words = 0;
while ((c = getc(fp)) != EOF) {
if (c != ' ' && c != '\n' && c != '\t') {
word = 1;
} else if (word) {
num_words++;
word = 0;
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}
}
num_words += word;
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printf("%i\n", num_words);
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return 0;
}
int main(int argc, char** argv)
{
if (argc == 1) {
return wc(stdin);
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} else if (argc > 1) {
FILE* fp = fopen(argv[1], "r");
if (!fp) {
perror("Could not open file");
return 1;
}
int wc_status = wc(fp);
int fclose_status = fclose(fp);
return (wc_status == 0) && (fclose_status == 0);
// can't do return wc_status == 0 && fclose_status == 0;
// because then if wc returns with -1, fclose is not called.
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} else {
printf("Usage: wc file.txt\n");
printf(" or: cat file.txt | wc\n");
printf(" or: wc # read from user-inputted stdin\n");
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}
return 0;
}