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